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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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Materials Science for energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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Techno-economic analysis of green hydrogen production by a floating solar photovoltaic system for industrial decarbonization

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Clean energy 2024年第4期8卷 1-14页

作者： Rahma Muthia Anastasia Segari Putri Pramudya Mochamad Rafly Maulana Widodo Wahyu Purwanto Department of Chemical Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaDepok16424Indonesia Master Program in Energy Systems Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia

This study proposes a conceptual design of green hydrogen production via proton exchange membrane electrolysis powered by a floating solar photovoltaic *** system contributes to industrial decarbonization in which hydrogen blending with natural gas is proposed as an approach to smooth the energy *** proposed design addresses the challenge of supplying a continuous flow-rate of green hydrogen,which is typically demanded by industrial end *** study particularly considers a realistic area required for the installation of a floating solar photovoltaic *** enable the green hydrogen production of 7.5 million standard cubic feet per day,the required structure includes the floating solar photovoltaic system and Li-ion batteries with the nominal capacities of 518.4 megawatts and 780.8 *** is equivalent to the requirement for 1524765 photovoltaic modules and 3718 Li-ion *** assessment confirms the technical viability of the proposed concept of green hydrogen production,transportation and *** the present commercialization is hindered by economics due to a high green hydrogen production cost of USD 26.95 per kg,this green hydrogen pathway is expected to be competitive with grey hydrogen produced via coal gasification and via natural gas steam reforming by 2043 and 2047,respectively.

关键词： floating solar photovoltaics gas blending green hydrogen industrial decarbonization lithium-ion battery photon exchange membrane electrolysis

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Techno-economic analysis of a hybrid renewable energy system integrated with productive activities in an underdeveloped rural region of eastern Indonesia

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Clean energy 2023年第6期7卷 1247-1267页

作者： Alya Nurul Shafira Subhan Petrana Rahma Muthia Widodo Wahyu Purwanto Sustainable Energy Systems and Policy Research Cluster Universitas IndonesiaDepok16424Indonesia Chemical Engineering Department Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia Master Program in Energy Systems Engineering Faculty of EngineeringUniversitas IndonesiaDepok16424Indonesia

The Southwest Maluku region in eastern Indonesia is considered a frontier,outermost and underdeveloped *** inhabitants live on isolated islands,including the residents of Mahaleta Village,where only 9.4%of the community have limited access to *** study aimed to design an economically feasible hybrid renewable energy(RE)system based on solar and wind energy to integrate with the productive activities of the *** study developed conceptual schemes to meet the demand for electricity from the resi-dential,community,commercial and productive sectors of the *** analysis was performed using a techno-economic *** hybrid system was designed using the HOMER Pro optimization function,and cold-storage and dryer systems were designed to support related productive *** optimized design of the hybrid RE system comprised 271.62 kW of solar photovoltaics,80 kW of wind turbines and a 1-MWh lead-acid *** found that the hybrid RE system would only be economically feasible with a full-grant incentive and an electricity tariff of$0.0808/***,the productive activity schemes were all economically feasible,with a cold-storage cost of$0.035/kg and a drying cost of$0.082/*** the hybrid RE system with productive activities can improve the economic feasibility of the energy system and create more jobs as well as increase income for the local community.

关键词： underdeveloped region hybrid renewable energy system photovoltaics wind turbine Indonesia

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Techno-Economic Analysis of Utilization Offshore Platform in the Java Sea to Produce Hydrogen with Offshore Wind Turbine-Based energy Sources 7

Techno-Economic Analysis of Utilization Offshore Platform in...

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7th Astechnova International energy Conference, ASTECHNOVA 2023

作者： Franika, Resistentio Vembre Ridwan, Muhhamad Kholid Perdana, Abram Master Program in System Engineering Universitas Gadjah Mada Jalan Teknika Utara 3 Yogyakarta55281 Indonesia Department of Physics Engineering Universitas Gadjah Mada Jalan Grafika 2 Yogyakarta55284 Indonesia Renewable Energy Systems HertfordshireWD4 8LR United Kingdom

Indonesia's geographical condition, which consists of 70 percent ocean territory, holds the potential for utilizing offshore wind turbines to provide cleaner energy. In this study, economic calculations were conducted for offshore wind turbines to generate green electricity and green hydrogen. The chosen ocean area for this endeavor is around the Papa offshore platform in the Java Sea. This area has experienced an economic decline, making it viable for repurposing as a sub-station for a powerhouse and an electrolyzer plant. Based on meteorological data analysis results, the area around the Papa offshore platform exhibits an average at height of 119 m;the wind speed is 5.5 m/*** prevailing wind direction is East Southeast (ESE), with a frequency of 25.2%. Further analysis of wind farms aimed at generating a capacity of 100.8 MW revealed an optimal potential energy generation of approximately 141,656.9 MWh per year. For scenario 1 (electricity production), the cost is $0.192/kWh. The levelized cost of hydrogen (LCOH) for scenario 2 (offshore electrolyzer) and scenario 3 (onshore electrolyzer) is $9.44/kg and $10.1/kg, respectively. To assess investment feasibility, a Net Present Value (NPV) analysis was conducted. This analysis yielded a selling price of electricity at $0.0271/kWh for the first scenario. For the second scenario, the selling price of hydrogen was calculated at $17.11/kg, and for the third scenario, it was $16.99/kg. Considering its flexibility and potential response to restrictions, the third scenario was deemed the most suitable for offshore utilization to produce clean energy. © Published under licence by IOP Publishing Ltd.

关键词： Offshore wind turbines

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Uniform National Discharge Standards - Overview and implications for future naval engineering

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NAVAL ENGINEERS JOURNAL 1999年第3期111卷 219-235页

作者： Kopack, D Smith, G Kim, D Erne, DL David F. Kopack:is a Program Manager in the Naval Sea Systems Command Office of Environmenta1 Protection Occupational Safety and Health SEA 00T. Mr. Kopack received his bachelor and master of science degrees in the physical sciences and management from the University of Maryland. Mr. Kopack has 20 years of experience in ship design and engineering industrial facility operations and program management. Gordon D. Smith:is a Chemical Engineer with the Carderock Division Naval Surface Warfare Center in Bethesda Maryland and is working in the Naval Sea Systems Command Environmental and Auxiliary Systems Group. SEA 03L. Mr. Smith received his bachelor of science degree in chemical engineering from The Ohio State University. He has over 13 years of ronmental issues. In addition to supporting the development of Uniform National Discharge Standards he has been involved in research design testing and development of pollution abatement technologies suitable for use aboard Navy Ships. Don K. Kim:is a Senior Mechanical Engineer with the naval architecture and marine engineering firm of M. Rosenblatt & Son Inc. in Arlington Virginia. Mr. Kim received his bachelor of science and master of engineering degrees in mechanical engineering from the University of Virginia. He is a registered Professional Engineer in the Commonwealth of Virgina. Mr. Kim has ten years of experience in the design installation maintenance and repair of shipboard mechanical systems equipment and components with specific expertise in compressor pump and fan design and operation. He is a member of the American Society of Naval Engineers and the American Society of Mechanical Engineer. David L. Erne:is an Associate with Booz Allen and Hamilton Inc. in Arlington Virginia. Mr. Erne received his bachelor of science degree in chemical engineering from the University of Idaho. He has over twelve years of experience in environmental program management and consulting. In addition to his support for the Uniform National Discharge Standards prog

In the Fiscal Year 1996 National Defense Authorization Act, Congress amended the Clean Water Act to provide the Department of Defense and the Environmental Protection Agency authority to jointly establish standards for incidental discharges from Armed Forces' vessels. The uniform national standards would apply to discharges from vessels of the Navy, Military Sealift Command, Army, Marine Corps, Air Force, and Coast Guard to the navigable waters and contiguous zone of the U.S. and its territories. Uniform National Discharge Standards (UNDS) will require control of discharges, by either a technology or management practice. UNDS will facilitate the Armed Forces' ability to better design and build future vessels to be environmentally sound and to maintain the operational flexibility of Armed Forces' vessels both domestically and internationally. The development of standards for Armed Forces' vessel discharges may have greater impact on naval engineering requirements for future vessels than any other single environmental issue, These standards are expected to stimulate the development of innovative vessel pollution control technologies, which on be used for both Armed Forces' vessels and commercial shipping vessels. This paper provides an overview of UNDS development, summarizes the results of UNDS Phase I, provides a summary overview of the preliminary approach for accomplishing UNDS Phase Il, and discusses implications for future naval engineering efforts.

关键词： Replenishment at sea homeland defense shipbuilding Military Personnel Uniform home range Treated water Naval engineering Uniforms Implication Clean Water Act Coastguards

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The Role of Interconnected Island Networks for Decarbonising Power Sector in Large Archipelago Nation

SSRN

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SSRN 2023年

作者： Reyseliani, Nadhilah Pratama, Yoga Wienda Shafira, Alya Nurul Dowell, Niall Mac Kammen, Daniel M. Purwanto, Widodo Wahyu Sustainable Energy Systems and Policy Research Cluster Universitas Indonesia Depok16424 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Master Program in Energy Systems Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Centre for Environmental Policy Imperial College London South Kensington LondonSW7 1NA United Kingdom Schlossplatz 1 Laxenburg2361 Austria Renewable and Appropriate Energy Laboratory and Energy and Resources Group University of California BerkeleyCA94720 United States

The reality in modelling the power system transition of an archipelagic country lies in the substantial investment required for interisland transmission lines and the uneven distribution of electricity demand. Approximately 72–75% of Indonesia's electricity demand is centered on Java, where the substantial population density constrains the land availability for renewable energy. Therefore, the spatial aspect in modelling Indonesian power system becomes important. This study assessed the differences in the decarbonisation of the Indonesian power system using single- and multi-region optimisation models and compared the isolated and interconnected power systems using the Integrated MARKAL–EFOM System (TIMES) Indonesia. The findings indicated that the isolated multi-region approach exhibited lower penetration of renewable energy compared to the single-region approach. Introducing interconnected power system enhanced the renewable energy mix by 2.5 times, reduced the overall system cost, CO2 storage capacity, and coal consumption by building 115 GW of interisland grid and importing 62% of electricity in Java from Sumatra, Kalimantan, and NT, which resulting in more distributed investment. However, due to the considerable distance, an interconnected power system is not considered a cost-effective solution for Papua, Sulawesi, and Maluku. Decarbonisation under coal phase-out plan helps reduce the interisland transmission system by 8.3%. © 2023, The Authors. All rights reserved.

关键词： Cost effectiveness

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Effect of calcium and magnesium catalyst on pyrolysis kinetic of Indonesian sugarcane bagasse for biofuel production

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energy Procedia 2019年 158卷 431-439页

作者： Yano Surya Pradana Daniyanto Muhamad Hartono Laras Prasakti Arief Budiman Chemical Engineering Department Faculty of Engineering Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta 55281 Indonesia Polytechnic of LPP – Plantation Training Institute Jalan LPP 1A Yogyakarta 55222 Indonesia Chemical Engineering Department Applied Sciences Faculty Delft University of Technology Mekelweeg 2 2628 CD Delft Netherlands Master Program of Systems Engineering Faculty of Engineering Universitas Gadjah Mada Jalan Teknika Utara No. 3 Yogyakarta 55281 Indonesia Center for Energy Studies Universitas Gadjah Mada Sekip K1-A Yogyakarta 55281 Indonesia

The present study aims to investigate the effect of CaO and MgO as catalyst in pyrolysis of Indonesian sugarcane bagasse (SCB) for biofuel production. Prior to being used as raw material, SCB underwent acid washing to remove its inherent Ca and Mg content. Catalytic and non-catalytic pyrolysis experiment were performed in a fixed-bed reactor within a temperature range of 20-480 o C. Thermogravimetric Analysis was used to describe the mechanism of pyrolysis and one-step global model was employed to determine the reaction kinetics. Pyrolysis stage comprised of a rapid decomposition zone (260-340 o C) and slow decomposition zone (340-480 o C). TG curve confirmed that the endothermic cellulose decomposition and volatilization was more dominant than exothermic polymerization and aromatization of lignin. Moreover, CaO provided the highest reaction kinetics with the lowest reaction order compared with catalytic pyrolysis with MgO and non-catalytic process, both in rapid and slow zone. Differential Thermal Analysis (DTA) and Differential Thermal Gravimetric (DTG) corresponded to this by showing that the energy for decomposition in non-catalytic process and using MgO and without catalyst was higher than SCB0-Ca which gave the highest conversion rate. Hence, this study shows that the addition of CaO as catalyst can improve the kinetics of SCB pyrolysis.

关键词： pyrolysis Indonesian sugarcane bagasse catalyst thermogravimetric reaction kinetic

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Long-term Planning of the Fuel System in Indonesia using Optimization

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IOP Conference Series: Materials Science and engineering 2021年第1期1053卷

作者： Najma Widodo Wahyu Purwanto Master Program on Energy System Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia Sustainable Energy Systems and Policy Reserach Cluster Chemical Engineering Department Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia.

Biofuel has been considered as an option to substitute petroleum fuels and reduce dependence of fossil fuel importation and greenhouse gasess emissions. Current Indonesia's biofuel blending mandates are cannot achieved due to technical, price and financial aspects. The objectives of the study are to obtain the optimum fuel supply mix by considering the fuel quality standard, production capacity and resource availability. Long-term fuel system optimization by minimum total system cost up to 2050 is carried out using TIMES-VEDA. The results showed that if goverment does not upgrade the quality of diesel up to EURO 4 and adapted EURO fuel specification with adjustment, the optimal fuel supply mix are FAME 50%-Diesel 50% in 2020-2030 and mix of FAME 47%-HVOSMR 53% in 2035-2050. For adapted EURO specification with adjustment except the sulphur content has fuel supply mix of HVOSMR 30%-Diesel 70% in 2020, FAME 20%-Diesel 80% for 2025-2030 and FAME 47%-HVOSMR 53% for 2035-2050. For gasoline, the optimum supply mix is Ethanol 5%-Gasoline 95% in 2020 and Ethanol-Ethanol2G 20%-Gasoline 80% in the 2025-2050. The utilization of biofuels can reduce the diesel and gasoline consumption for about 67-79% and 19% and reduce carbon intensity by 65-78% and 27%, respectively.

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RACER - A DESIGN FOR MAINTAINABILITY

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NAVAL ENGINEERS JOURNAL 1985年第5期97卷 139-146页

作者： DONOVAN, MR MATTSON, WS Michael R. Donovanis a 1974 graduate of the United States Naval Academy where he received his undergraduate degree in naval architecture. In 1975 he received a master of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. After completing the Navy's nuclear power training program he served as machinery division officer in USSBainbridge (CGN-25) and chemistry and radiological controls assistant in USSLong Beach (CGN-9). He successfully completed the Navy's surface warfare officer qualification and passed the nuclear engineer's examination administered by Naval Reactors. He was then assigned to the Ship Design and Engineering Directorate (SEA-05) Naval Sea Systems Command as head systems engineer on the DDG-51 ship design project where he received the Navy Commendation Medal for outstanding performance. He is currently with Solar Turbines Incorporated as manager ship integration and integrated logistic support for the Rankine cycle energy recovery (RACER) system. Mr. Donovan has lectured at Virginia Polytechnic Institute teaching marine engineering and has given presentations on ship design at various symposiums and section meetings for both ASNE and SNAME. He has been a member of ASNE and SNAME since 1972 and is registered as a professional engineer in California and Virginia. Wayne S. Mattsonreceived his B.S. degree in mechanical engineering from Western New England College in 1972. Following graduation he attended Naval Officer Candidate School and was subsequently assigned as a project officer to COMOPTEVFOR where he was responsible for technical and operational test plans their execution and final equipment appraisal. Following a tour as engineering officer aboard the USSNespelen (AOG-55) he was assigned as commissioning MPA aboard the USSElliot (DD-967) the fifthSpruanceclass destroyer. For the past six years he has been employed by Solar Turbines Incorporated in program management within the advanced development department. He is currently

There is a great deal of emphasis currently in the Navy on the issues of reliability and maintainability. If a system or component is out of commission, it obviously cannot perform its mission. Thus, systems and components must be reliable, with low failure rates, and maintainable, with short repair times when the system does become inoperable. To be effective, these attributes must be incorporated into new ship systems early in the design stage. The Rankine cycle energy recovery (RACER) system is a heat recovery steam cycle designed to recover energy from the exhaust of an LM2500 gas turbine for augmentation of a ship's propulsion system. The RACER system provides several advantages to a gas turbine powered ship, one of which is improved fuel efficiency for significant annual fuel savings. This saving does not come free, however, since, in general, any additional system installed in the ship will have some maintenance requirements. In keeping with the Navy's current emphasis, a key philosophy in the design of the RACER system has been to minimize this maintenance burden. After a brief description of the RACER system and its design philosophy, the techniques being used during the design phase to minimize the maintenance burden on the fleet are presented. Trade-off studies concerning acquisition versus life-cycle costs, including fuel and maintenance costs, are discussed. Innovations incorporated into this state-of-the-art system are reviewed with an emphasis on design for affordability.

关键词： COGENERATION PLANTS

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A COMPUTER-MODEL FOR SHIPBOARD energy ANALYSIS

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NAVAL ENGINEERS JOURNAL 1984年第5期96卷 33-45页

作者： DETOLLA, JP FLEMING, JR Joseph DeTolla:is a ship systems engineer in the Ship Systems Engineering Division SEA 56D5 at the Naval Sea Systems Command. His career with the Navy started in 1965 at the Philadelphia Naval Shipyard Design Division. In 1971 he transferred to the Naval Ship Engineering Center. He has held positions as a fluid systems design engineer and auxiliary systems design integration engineer. Mr. DeTolla has worked extensively in the synthesis and analysis of total energy systems notably the design development of the FFG-7 class waste heat recovery system. He is NA VSEA's machinery group computer supported design project coordinator and is managing the development of a machinery systems data base load forecasting algorithms and design analysis computer programs. Mr. DeTolla has a bachelor of science degree in mechanical engineering from Drexel University and a master of engineering administration degree from George Washington University. He is a registered professional engineer in the District of Columbia and has written several technical papers on waste heat recovery and energy conservation. Jeffrey Fleming:is a senior project engineer in the Energy R&D Office at the David Taylor Naval Ship R&D Center. In his current position as group leader for the future fleet energy conservation portion of the Navy's energy R&D program he is responsible for the identification and development of advanced components and subsystems which will lead to reductions in the fossil fuel consumption of future ships. Over the past several years he has also directed the development and application of total energy computer analysis techniques for the assessment of conventional and advanced shipboard machinery concepts. Mr. Fleming is a 1971 graduate electrical engineer of Virginia Polytechnic Institute and received his MS in electrical engineering from Johns Hopkins University in 1975. Mr. Fleming has authored various technical publications and was the recipient of the Severn Technical Society's “Best Technical Paper of the Year” award in 1

In support of the Navy's efforts to improve the energy usage of future ships and thereby to reduce fleet operating costs, a large scale computer model has been developed by the David Taylor Naval Ship Research and Development Center (DTNSRDC) to analyze the performance of shipboard energy systems for applications other than nuclear or oil-fired steam propulsion plants. This paper discusses the applications and utility of this computer program as a performance analysis tool for design of ship machinery systems. The program is a simulation model that performs a complete thermodynamic analysis of a user-specified energy system. It offers considerable flexibility in analyzing a variety of propulsion, electrical, and auxiliary plant configurations through a component building block structure. Component subroutines that model the performance of shipboard equipment such as engines, boilers, generators, and compressors are available from the program library. Component subroutines are selected and linked in the program to model the desired machinery plant functional configurations. The operation of the defined shipboard energy system may then be simulated over a user-specified scenario of temperature, time, and load profiles. The program output furnishes information on component operating characteristics and fuel demands, which allows evaluation of the total system performance.

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