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Upcycling end of lithium cobalt oxide batteries to electrocatalyst for oxygen reduction reaction in direct methanol fuel cell via sustainable approach

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Journal of energy Chemistry 2023年第7期82卷 148-157,I0004页

作者： Keyru Serbara Bejigo Kousik Bhunia Jungho Kim Chaehyeon Lee Seoin Back Sang-Jae Kim Nanomaterials&System Lab Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea Nanomaterials&System Lab Major of Mechanical System EngineeringCollege of EngineeringJeju National UniversityJeju 63243Republic of Korea Research Institute of New Energy Industry(RINEI) Jeju National UniversityJeju 63243Republic of Korea Department of Chemical and Biomolecular Engineering Institute of Emergent MaterialsSogang UniversitySeoul 04107Republic of Korea

Recycling spent lithium-ion batteries(SLIBs)has become essential to preserve the environment and reclaim vital resources for sustainable *** typical SLIBs recycling concentrated on separating valuable components had limitations,including high energy consumption and complicated separation *** work suggests a safe hydrometallurgical process to recover usable metallic cobalt from depleted LiCoO_(2)batteries by utilizing citric acid as leachant and hydrogen peroxide as an oxidizing agent,with ethanol as a selective precipitating *** anode graphite was also recovered and converted to graphene oxide(GO).The above components were directly resynthesized to cobaltintegrated nitrogen-doped graphene(Co@NG).The Co@NG showed a decent activity towards oxygen reduction reaction(ORR)with a half-wave potential of 0.880 V ***,almost similar to Pt/C(0.888 V ***)and with an onset potential of 0.92 V *** metal-nitrogen-carbon(Co-N-C)having the highest nitrogen content has decreased the barrier for ORR since the reaction was enhanced for Co@NG-800,as confirmed by density functional theory(DFT)*** Co@NG cathode catalyst coupled with commercial Pt-Ru/C as anode catalyst exhibits excellent performance for direct methanol fuel cell(DMFC)with a peak power density of 34.7 mW cm^(-2)at a discharge current density of120 m A cm^(-2)and decent stability,indicating the promising utilization of spent battery materials in DMFC ***,lithium was recovered from supernatant as lithium carbonate by coprecipitation *** work avoids sophisticated elemental separation by utilizing SLIBs for other renewable energy applications,lowering the environmental concerns associated with recycling.

关键词： Density functional theory(DFT) Direct methanol fuel cell Leaching Nitrogen doping Oxygen reduction reaction Recycling Spent lithium-ion batteries

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Recent trends,challenges,and perspectives in piezoelectric-driven self-chargeable electrochemical supercapacitors

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Carbon energy 2022年第5期4卷 833-855页

作者： Karthikeyan Krishnamoorthy Parthiban Pazhamalai Sindhuja Manoharan Noor Ul Haq Liyakath Ali Sang-Jae Kim Nanomaterials&System Lab Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJejuSouth Korea Research Institute of Energy New Industry Jeju National UniversityJejuSouth Korea Nanomaterials&System Lab Major of Mechanical System EngineeringCollege of EngineeringJeju National UniversityJejuSouth Korea

The increasing demand for wearable electronic devices has resulted in tremendous progress in research on energy harvesting and storage devices/*** storage devices require a power source to charge them,whereas energy harvesting devices require a storage compartment to store the harvested energy for sustainable ***,a piezoelectrically driven self-charging supercapacitor power cell(SCSPC)was developed to harvest and store electrical energy in a solitary system to determine the potential impact of these two types of energy devices for wearable electronic *** review describes the recent advances in piezoelectric-driven SCSPCs in terms of device configuration,piezoelectric separator,electrolyte types,electrode materials,current collectors,and system *** review focuses specifically on the principles and mechanism of the self-charging process that occurred in the SCSPCs and the use of a promising piezo electrochemical spectroscopic tool to realize the piezo electrochemical energy transfer and storage process in the ***,the current challenges and new perspectives for future developments in the emerging area of SCSPCs or integrated energy devices are discussed.

关键词： electrospinning integrated energy cell mechanical energy piezoelectric separators piezoelectrochemical spectroscopy self-charging supercapacitor power cell

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Development of Webcam Based Hand Tracking for Virtual Reality Interaction 5

Development of Webcam Based Hand Tracking for Virtual Realit...

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5th International Conference on Image, Video Processing, and Artificial Intelligence, IVPAI 2023

作者： Murugan, Aditya Subramani Behzad, Adele Kim, Eunsik Chung, Joon Jung, Dong-Won University of Windsor 401 Sunset Ave WindsorONN9B 3P4 Canada Department of Aerospace Engineering Toronto Metropolitan University 350 Victoria Street TorontoONM5B 2K3 Canada Faculty of Applied Energy System Major of Mechanical Engineering Jeju National University 102 Jejudaehak-ro Jeju-si63243 Korea Republic of

ISBN: (纸本)9781510674660

This paper presents a novel 'outside-in' hand tracking system for Virtual Reality (VR) and Augmented Reality (AR) interactions using an external camera, specifically a webcam. While current VR Head Mounted Displays (HMDs) primarily employ 'inside-out' systems that limit hand positioning and lead to user discomfort, our proposed system offers greater freedom in hand placement and supports a natural hand posture. With the potential to engage multiple users simultaneously, the system enhances collaborative experiences in immersive 3D VR/AR spaces. The system captures the user's hand movements through a webcam, processes the frames using a Media Pipe 3D hand pose model, predicts gestures, and calculates the hand's position and orientation. The proposed model achieved a gesture prediction accuracy of 99% in testing. Furthermore, a Unity3D demonstration showcased the system's capability in replicating precise hand articulations and performing tasks such as button pressing and cube stacking. Our approach addresses both usability and inclusivity challenges, offering a more ergonomic and economical alternative for VR/AR interaction. © 2024 SPIE. All rights reserved.

关键词： Virtual reality

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Comprehensive Insight into the Mechanism, Material Selection and Performance Evaluation of Supercapatteries

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Nano-Micro Letters 2020年第7期12卷 43-88页

作者： Saravanakumar Balasubramaniam Ankita Mohanty Suresh Kannan Balasingam Sang Jae Kim Ananthakumar Ramadoss School for Advanced Research in Polymers Laboratory for Advanced Research in Polymeric MaterialsCentral Institute of Plastics Engineering and TechnologyBhubaneswar 751024India Department of Materials Science and Engineering Faculty of Natural SciencesNorwegian University of Science and Technology(NTNU)Trondheim 7491Norway Nanomaterials and Systems Laboratory Major of Mechatronics EngineeringFaculty of Applied Energy SystemJeju National UniversityJeju 63243Republic of Korea

Electrochemical energy storage devices(EESs)play a crucial role for the construction of sustainable energy storage system from the point of generation to the end user due to the intermittent nature of renewable ***,to meet the demand for next-generation electronic applications,optimizing the energy and power densities of EESs with long cycle life is the crucial *** e orts have been devoted towards the search for new materials,to augment the overall performance of the *** there are a lot of ongoing researches in this field,the performance does not meet up to the level of commercialization.A further understanding of the charge storage mechanism and development of new electrode materials are highly *** present review explains the overview of recent progress in supercapattery devices with reference to their various *** di erent charge storage mechanisms and the multiple factors involved in the performance of the supercapattery are described in ***,recent advancements in this supercapattery research and its electrochemical performances are ***,the challenges and possible future developments in this field are summarized.

关键词： Supercapattery energy density Power density Redox materials Carbon materials

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Robust prediction-based control for unknown time-varying delays and disturbances in spherical motion platform

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Control engineering Practice 2025年 163卷

作者： Seong-Min Lee Sangheon Lee Hungsun Son Department of Mechanical Systems Engineering Jeju National University Jeju 63243 South Korea Major of Mechatronics Engineering and faculty of Applied Energy System Jeju National University Jeju 63243 South Korea School of Mechanical Engineering Kyungpook National University Daegu 41566 South Korea Department of Mechanical Engineering Ulsan National Institute of Science and Technology Ulsan 44919 South Korea

This paper presents a new prediction-based controller utilizing enhanced preview and state prediction methods to deal with unknown time-varying delays and disturbances. In practice, uncertain and variable time delays in virtual reality applications can lead to control instability and a significant reduction in the overall sense of realism. In this paper, a robust prediction-based control (RPC) is proposed for the spherical motion platform (SMP) to compensate for the effects of the time-varying delays and disturbances. The RPC comprises a preview strategy and state/disturbance prediction methods with an estimator to handle unknown time-varying delays. In addition, a newly proposed preview method improves the system’s ability to follow a time-varying reference trajectory. The stability analysis for the time-delayed system incorporating the RPC is conducted using the Lyapunov–Krasovskii approach. Numerical simulations and various experiments demonstrate that the RPC effectively leads the state to converge to the desired trajectory within an error bound under various conditions of time-varying delays in the presence of disturbances, whereas the existing controllers have limitations in reducing the desired control errors. Consequently, the results validate the feasibility and effectiveness of the RPC in real-world applications, demonstrating its robustness in handling time-varying delays through practical implementation on the SMP.

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Tunable Phase-Engineered Polyhydroxybutyrate Fibrous Mat: An energy Autonomous, Temperature-Responsive Platform for Wearable Application

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Advanced Fiber Materials 2025年

作者： Sharma, Kusum Alluri, Nagamalleswara Rao Prasanna, Asokan Poorani Sathya Perumalsamy, Muthukumar Saj, Anandhan Ayyappan Ryu, Yeonkyeong Lee, Ju-Hyuck Park, Kwi-Il Kim, Sang-Jae Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju63243 Korea Republic of Research Institute of Automotive Parts and Materials Kyungpook National University Buk-Gu Daegu41566 Korea Republic of Department of Materials Science and Metallurgical Engineering Kyungpook National University Buk-Ku Daegu41566 Korea Republic of Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology 333 Techno Jungang-Daero Dalseong-Gun Daegu42988 Korea Republic of Nanomaterials and System Lab Major of Mechanical System Engineering College of Engineering Jeju National University Jeju63243 Korea Republic of Jeju National University Jeju63243 Korea Republic of Jeju National University Jeju63243 Korea Republic of

Biodegradable and biocompatible organic polymers play a pivotal role in designing the next generation of wearable smart electronics, reducing electronic waste and carbon emissions while promoting a toxin-free environment. Herein, an electrospun fibrous polyhydroxybutyrate (PHB) organic mat-based, energy-autonomous, skin-adaptable temperature sensor is developed, eliminating the need for additional storage or circuit components. The electrospun PHB mat exhibits an enhanced β-crystalline phase with a β/α phase ratio of 3.96 using 1,1,1,3,3,3-hexafluoro-2-propanol as a solvent. Solvent and film processing techniques were tailored to obtain high-quality PHB films with the desired thickness, flexibility, and phase conversion. The PHB mat-based temperature sensor (PHB–TS) exhibits a negative temperature coefficient of resistance, with a sensitivity of − 2.94%/°C and a thermistor constant of 4676 K, outperforming pure metals and carbon-based sensors. A triboelectric nanogenerator (TENG) based on the enhanced β-phase PHB mat was fabricated, delivering an output of 156 V, 0.43 µA, and a power density of 1.71 mW/m2. The energy-autonomous PHB–TS was attached to the index finger to monitor temperature changes upon contact with hot and cold surfaces, demonstrating good reliability and endurance. © Donghua University, Shanghai, China 2025.

关键词： Electrospinning

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Smart Maracas: An Innovative Triboelectric Nanogenerator for Earthquake Detection and energy Harvesting

SSRN

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SSRN 2023年

作者： Chandrasekhar, Arunkumar Basith, Sayyid Abdul Vivekananthan, Venkateswaran Khandelwal, Gaurav Maria Joseph Raj, Nirmal Prashant Purusothaman, Yuvasree Kim, Sang Jae Nanosensors and Nanoenergy Lab Sensor Systems Lab Department of Sensor and Biomedical Technology School of Electronics Engineering Vellore Institute of Technology Tamil Nadu Vellore632014 India Center for Flexible Electronics Department of Electronics and Communication Engineering Koneru Lakshmaiah Education Foundation Andhra Pradesh 522302 India James Watt South Building School of Engineering University of Glasgow G12 8QQ United Kingdom Energy Harvesting Research Group School of Physics and Astronomy SUPA University of St Andrews United Kingdom Department of Materials Science and Engineering The Pennsylvania State University University ParkPennsylvania16802 United States Nanomaterials and Systems Laboratory Faculty of Applied Energy Systems Major in Mechatronics Engineering Jeju National University Korea Republic of Jeju National University Jeju63243 Korea Republic of

In an era marked by a growing demand for sustainable energy solutions and resilient disaster management systems, the convergence of innovative technologies holds the promise of addressing multifaceted challenges. This manuscript explores the multifunctional capabilities of the "smart maracas", a novel triboelectric nanogenerator (TENG) designed to harvest mechanical energy and simultaneously serve as an earthquake sensor. The smart maracas is a striking example of the potential of TENGs to harness mechanical motion for practical applications. The device converts mechanical energy into electrical power through meticulous engineering, opening avenues for self-sustaining power sources in various domains. The manuscript outlines the device's structural design, working principle, and real-time applications, spanning bio-mechanical energy harvesting, vibrational energy scavenging, rotational energy harvesting, and a unique sensing application for door monitoring. A pivotal aspect of this research revolves around the smart maracas' role as an earthquake sensor. Rigorous experiments were conducted to assess the device's responsiveness to simulated seismic forces. Notably, a linear relationship with an R² value of 0.9989 was established between the voltage generated by the smart maracas and seismic acceleration. This remarkable correlation underscores the device's precision and reliability in detecting seismic events, opening doors for cost-effective earthquake monitoring solutions. © 2023, The Authors. All rights reserved.

关键词： Earthquakes

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Recent Advances in Triboelectric Nanogenerators: From Technological Progress to Commercial Applications

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ACS Nano 2023年第12期17卷 11087-11219页

作者： Choi, Dongwhi Lee, Younghoon Lin, Zong-Hong Cho, Sumin Kim, Miso Ao, Chi Kit Soh, Siowling Sohn, Changwan Jeong, Chang Kyu Lee, Jeongwan Lee, Minbaek Lee, Seungah Ryu, Jungho Parashar, Parag Cho, Yujang Ahn, Jaewan Kim, Il-Doo Jiang, Feng Lee, Pooi See Khandelwal, Gaurav Kim, Sang-Jae Kim, Hyun Soo Song, Hyun-Cheol Kim, Minje Nah, Junghyo Kim, Wook Menge, Habtamu Gebeyehu Park, Yong Tae Xu, Wei Hao, Jianhua Park, Hyosik Lee, Ju-Hyuck Lee, Dong-Min Kim, Sang-Woo Park, Ji Young Zhang, Haixia Zi, Yunlong Guo, Ru Cheng, Jia Yang, Ze Xie, Yannan Lee, Sangmin Chung, Jihoon Oh, Il-Kwon Kim, Ji-Seok Cheng, Tinghai Gao, Qi Cheng, Gang Gu, Guangqin Shim, Minseob Jung, Jeehoon Yun, Changwoo Zhang, Chi Liu, Guoxu Chen, Yufeng Kim, Suhan Chen, Xiangyu Hu, Jun Pu, Xiong Guo, Zi Hao Wang, Xudong Chen, Jun Xiao, Xiao Xie, Xing Jarin, Mourin Zhang, Hulin Lai, Ying-Chih He, Tianyiyi Kim, Hakjeong Park, Inkyu Ahn, Junseong Huynh, Nghia Dinh Yang, Ya Wang, Zhong Lin Baik, Jeong Min Choi, Dukhyun Kyung Hee University Gyeonggi Yongin17104 Korea Republic of Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Mechanical Engineering Soft Robotics Research Center Seoul National University Seoul08826 Korea Republic of Department of Mechanical Engineering Gachon University Seongnam13120 Korea Republic of Department of Biomedical Engineering National Taiwan University Taipei10617 Taiwan Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu30013 Taiwan School of Advanced Materials Science & Engineering Sungkyunkwan University Suwon16419 Korea Republic of Sungkyunkwan University 2066 Seobu-ro Gyeonggi Suwon16419 Korea Republic of Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Division of Advanced Materials Engineering Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Jeonbuk National University 567 Baekje-daero Jeonbuk Jeonju54896 Korea Republic of Department of Physics Inha University 100 Inha-ro Incheon22212 Korea Republic of School of Materials Science & Engineering Yeungnam University Gyeongbuk Gyeongsan38541 Korea Republic of 291 Daehak-ro Daejeon34141 Korea Republic of School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Flexible Electronics Technology of Tsinghua Zhejiang Jiaxing314000 China Nanomaterials and System Lab Major of Mechatronics Engineering Faculty of Applied Energy System Jeju National University Jeju632-43 Korea Republic of School of Engineering University of Glasgow GlasgowG128QQ United Kingdom Seoul02792 Korea Republic of Department of Physics Inha University Incheon22212 Korea Republic of Suwon16419 Korea Republic of Department of

Serious climate changes and energy-related environmental problems are currently critical issues in the world. In order to reduce carbon emissions and save our environment, renewable energy harvesting technologies will serve as a key solution in the near future. Among them, triboelectric nanogenerators (TENGs), which is one of the most promising mechanical energy harvesters by means of contact electrification phenomenon, are explosively developing due to abundant wasting mechanical energy sources and a number of superior advantages in a wide availability and selection of materials, relatively simple device configurations, and low-cost processing. Significant experimental and theoretical efforts have been achieved toward understanding fundamental behaviors and a wide range of demonstrations since its report in 2012. As a result, considerable technological advancement has been exhibited and it advances the timeline of achievement in the proposed roadmap. Now, the technology has reached the stage of prototype development with verification of performance beyond the lab scale environment toward its commercialization. In this review, distinguished authors in the world worked together to summarize the state of the art in theory, materials, devices, systems, circuits, and applications in TENG fields. The great research achievements of researchers in this field around the world over the past decade are expected to play a major role in coming to fruition of unexpectedly accelerated technological advances over the next decade. © 2023 The Authors. Published by American Chemical Society

关键词： Nanogenerators

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Comparative thermodynamic performance assessment of two-stage cycle for various refrigerants

Comparative thermodynamic performance assessment of two-stag...

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作者： Yilmaz, Fatih Ozturk, Murat Selbaş, Reşat Department of Electrical and Energy Vocational School of Technical Science Aksaray University 68100 Turkey Department of Mechatronics Engineering Faculty of Technology Applied Science University of Isparta Cunur West Campus Isparta32200 Turkey Department of Energy System Engineering Faculty of Technology Applied Science University of Isparta Cunur West Campus Isparta32200 Turkey

In this paper, the thermodynamic performance evaluations of the two-stage cooling cycle are investigated comparatively for different refrigerants under the same operating conditions. Due to their environmentally friendly properties, CO2, R600, R600a, R161, and R134a are selected as the refrigerants. The change in energy performance coefficient (COPen) and exergy performance coefficient (COPex) of the defined cycle are investigated according to the various indicators, such as reference temperature, gas cooler outlet temperature and pressure. Results are shown that, at the evaporator temperature of -5°C and the gas cooler outlet temperature of 40°C, the COPen of the cooling cycle are 1.644, 1.603, 1.452, 2.0356 and 1.928 for the refrigerants CO2, R600, R600a, R161 and R134a, respectively. Furthermore, COPex of the cycle are computed as 25.94%, 15.57%, 14.07%, 19.73% and 18.68% for the same refrigerants in the same order. In addition, the overall exergy destruction rate of the cooling cycle for CO2 refrigerant is calculated as 145.69 kW. © 2019 Inderscience Enterprises Ltd.

关键词： Refrigerants

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A Study on the Operation Method of Hybrid energy Storage system Connected with Wind Turbine

A Study on the Operation Method of Hybrid Energy Storage Sys...

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2018 IEEE International Conference on High Voltage engineering and Application, ICHVE 2018

作者： Kang, Min Hyeok Chae, Sang Heon Ahn, Jin Hong Kim, Gi Hoon Lee, Seong Hoon Yang, Seungmoo Kim, Ho Min Kim, Eel-Hwan Faculty of Applied Energy System Major of Electrical Engineering Jeju National University Jeju-si Korea Republic of

ISBN: (纸本)9781538650868

Nowadays, there are many wind farms around the world. However, intermittent characteristics of wind power output can cause unbalanced grid condition between demand load and generation resources, especially in isolated area such as Jeju Island located in the Republic of Korea. Grid operator of Jeju Island has often curtailed wind power output for the stability of Jeju power system. Therefore, this paper proposes not only installation of hybrid energy storage system (HESS) combining lithium-ion battery with water electrolysis device (WED), but also its operation algorithm to save controlled wind power output. This system will be focused on supplying electrical power stably to WED by using wind power generation and lithium-ion battery, because the WED should be always turned on to prevent lifetime degradation. The proposed method will be applied to simulation model including wind turbine generator, lithium-ion battery, WED and power conversion systems. The simulation results will be carried out using PSCAD/EMTDC program. © 2018 IEEE.

关键词： Lithium-ion batteries

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