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Photovoltaic-based energy system coupled with energy storage for all-day stable PEM electrolytic hydrogen production

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RENEWABLE ENERGY 2023年第1期209卷 53-62页

作者： Gu, Xufei Ying, Zhi Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Photovoltaic (PV) power generation coupled with proton exchange membrane (PEM) water electrolysis favors improving the solar energy utilization and producing green hydrogen. But few systems proposed focus on achieving all-day stable hydrogen production, which is important for the future large-scale hydrogen utilization. Herein, a PV-Battery-PEM water electrolysis system for hydrogen production was constructed. An energy man-agement strategy (EMS) was proposed to achieve the goal of all-day stable hydrogen production, improve energy utilization efficiency and reduce light discard rate. The PV power generation system, battery system and PEM electrolyzer for hydrogen production system were first established by Matlab/Simulink platform. Then, the overall PV-Battery-PEM electrolyzer system for hydrogen production was constructed, and the effectiveness of EMS was verified. The energy efficiency of the system under different working conditions with and without battery for energy storage was analyzed. The results show that the proposed energy management strategy can meet the purpose of all-day stable hydrogen production. Under the same working conditions, the energy effi-ciency of the system with battery for energy storage increases by 2-4% compared with the system without battery for energy storage, which indicates that the addition of energy storage can improve the energy utilization and reduce the light discarding.

关键词： Hydrogen production Photovoltaic power generation Proton exchange membrane water electrolysis Energy storage Energy management strategy System efficiency

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Efficient anodic biochar oxidation over three- dimensional self-support nickel-iron nanosheet on nickel foam in biochar-assisted water electrolysis for hydrogen production

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2023年第3期48卷 894-908页

作者： Du, Yueyue Ying, Zhi Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Biochar-assisted water electrolysis (BAWE) facilitates the high-value utilization of biomass and energy-saving hydrogen production. However, the BAWE efficiency is hindered by slow kinetics of biochar oxidation reaction (BOR) at anode. Herein, to improve the overall efficiency of BAWE, three-dimensional porous nanosheets modified on nickel foam (Ni1Fe2- LDH@NF) was developed for BOR, and its mechanism was identified. Impressively, the BAWE system exhibited remarkable activity, including a low potential of 1.387 V vs. RHE for BOR over as-synthesized electrocatalyst at current density of 10 mA center dot cm-2, and excellent long-term stability over 20 h at a high current density of 200 mA center dot cm-2 and after 1000 CV cycles. The required electricity input was 3.29 kWh center dot Nm-3H2 at 10 mA center dot cm-2 for BAWE with Ni1Fe2-LDH@NF toward BOR. In addition, the reaction mechanism of BOR including biochar direct oxidation on the electrocatalysts surface and indirect oxidation in the electrolyte was deduced, according to the surface chemistry and composition changes of electrocatalysts and biochar, as well as the products. This work provides an effective strategy towards the enhancement of the BOR process by designing the binder-free electrocatalysts, and facilitates the development of BAWE for energy-efficient hydrogen production and biomass utilization.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Biochar-assisted water electrolysis (BAWE) Biochar oxidation reaction (BOR) Nickel-iron nanosheets Hydrogen

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Process modelling and assessment of thermochemical sulfur-iodine cycle for hydrogen production considering Bunsen reaction kinetics

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CHEMICAL engineering AND PROCESSING-PROCESS INTENSIFICATION 2024年 195卷

作者： Yang, Aoli Ying, Zhi Zhao, Muyang Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Thermochemical sulfur-iodine (SI) cycle is one of the large-scale, clean, and efficient hydrogen production routes. The Bunsen reaction process is always simulated by a stoichiometric reaction, without considering the realistic Bunsen reaction kinetic process. Herein, a user-defined Fortran module concerning Bunsen reaction kinetics was developed and embedded into a continuous stirred tank reactor (RCSTR), and then a SI flowsheet with 100 L/h hydrogen production was modeled. The key parameter optimization, mass and energy balance were analyzed, the internal heat exchange network was created using the pinch point temperature difference analysis and the principle of energy cascade utilization, along with thermal efficiency evaluation. Bunsen reaction process reaches equilibrium after a period, which is consistent with experiments. The increase of H2SO4 decomposition ratio is beneficial to reduce the energy consumption of system. Increase in temperature has less effect on increasing the equilibrium decomposition ratio of HI. The theoretical thermal efficiency of system reaches 14.0-57.4 % considering the recovery of exothermic heat. This work provides a theoretical basis for the optimization of SI cycle.

关键词： Hydrogen production Sulfur-iodine cycle Bunsen reaction kinetics Internal heat exchange network Thermal efficiency

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Lignin oxidation reaction kinetics and its conversion into high-value chemicals over self-prepared electrode during lignin-assisted water electrolysis for hydrogen production

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RENEWABLE ENERGY 2024年 237卷

作者： Ying, Zhi Sun, Hao Cao, Jiahao Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Electrochemical oxidation of lignin coupled with water electrolysis forms lignin-assisted water electrolysis (LAWE), which reduces the energy consumption of hydrogen production and achieves the high-value conversion of lignin. However, the kinetics of lignin oxidation reaction (LOR) is slow, and the correlation between operating parameters and LOR kinetics is rarely found. Herein, a vertical self-grown nickel-iron layered hydroxide nanosheet on a nickel foam substrate (Ni1Fe2-LDH@NF) was synthesized for improving LOR kinetics, and the influence of lignin concentration, NaOH concentration, and temperature on LOR kinetics was revealed. A mathematical model correlating LOR kinetics with operating parameters was developed, and based on variance analysis, NaOH concentration was found the biggest factor affecting LOR kinetics. The best LOR kinetics was reached at the lignin concentration of 10 g/L, the NaOH concentration of 0.8 mol/L, and the temperature of 50-80 degrees C. In addition, the LOR over Ni1Fe2-LDH@NF and hydrogen production presented excellent stability during LAWE process at high current density of 200 mA cm(-2) and 65 degrees C. The lignin underwent large skeleton breakage and oxygen-containing functional groups consumption, and successfully converted into value-added chemicals such as 2,4-di-tert-butylphenol. This work highlights the importance of understanding LOR kinetics, providing opportunities for optimized lignin upgrading in LAWE process.

关键词： Hydrogen production Lignin-assisted water electrolysis (LAWE) Lignin oxidation reaction (LOR) Operating parameters Modeling Analysis of variance

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Enhanced oxygen evolution reaction kinetics through biochar-based nickel-iron phosphides nanocages in water electrolysis for hydrogen production

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2022年第67期47卷 28782-28793页

作者： Ying, Zhi Gao, Li Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Highly-efficient and stable non-noble metal electrocatalysts for overcoming the sluggish kinetics of oxygen evolution reaction (OER) is urgent for water electrolysis. Biomass -derived biochar has been considered as promising carbon material because of its advan-tages such as low-cost, renewable, simple preparation, rich structure, and easy to obtain heteroatom by in-situ doping. Herein, Ni2P-Fe2P bimetallic phosphide spherical nanocages encapsulated in N/P-doped pine needles biochar is prepared via a simple two-step pyrolysis method. Benefiting from the maximum synergistic effects of bimetallic phosphide and biochar, high conductivity of biochar encapsulation, highly exposed active sites of Ni2P-Fe2P spherical nanocages, rapid mass transfer in porous channels with large specific surface area, and the promotion in adsorption of reaction intermediates by high-level heteroatom doping, the (Ni0.75Fe0.25)2P@NP/C demonstrates excellent OER activity with an overpotential of 250 mV and a Tafel slope of 48 mV/dec at 10 mA/cm(2) in 1 M KOH. Also it exhibits a long-term durability in 10 h electrolysis and its activity even improves during the electrocatalytic process. The present work provides a favorable strategy for the inexpensive synthesis of biochar-based transition metal electrocatalysts toward OER, and improves the water electrolysis for hydrogen production. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Water electrolysis Oxygen evolution reaction (OER) Biochar Ni2P-Fe2P Hydrogen

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Lattice Boltzmann simulation of wetting gradient accelerating droplets merging and shedding on a circumferential surface

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engineering APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS 2022年第1期16卷 1796-1812页

作者： Chen, Lu Gao, Ming Liang, Jia Wang, Dongmin Hao, Liang Zhang, Lixin Univ Shanghai Sci & Technol Sch Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

A lattice Boltzmann method (LBM) based on Shan-Chen pseudo-potential model is used to investigate the process of droplets merging and shedding on a gradient wetting circular surface. The effects of wetting gradient, radius, and radius ratio on droplet merging and shedding were mainly explored. The results show that applying a wetting gradient on the circumferential surface can accelerate the process of droplet merging and shedding. The velocity of droplets merging and shedding increase with the increase of the wetting gradient. The more hydrophilic the original surface, the better the optimization effect of accelerating drainage is by applying a wetting gradient. The radius and radius ratio significantly affect droplets merging and shedding on the gradient wetting surface. The larger the radius and radius ratio, the shorter the droplets merging and shedding time.

关键词： Droplets lattice boltzmann method wetting gradient circumferential surface shedding

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Comparative investigation of numerical simulation and experimental study of electroconvection layer in natural convection heat transfer enhanced by an electric field

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INTERNATIONAL COMMUNICATIONS IN heat AND MASS transfer 2024年 153卷

作者： Gao, Ming Zhang, Ling-shuang Zhang, Bang-hui Lou, Qin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

This article utilizes numerical simulation methods, grounded in experimental data and models to investigate the formation process of the electroconvection layer and its role in enhancing natural convection heat transfer. After verifying the feasibility of the model, the experimental results were compared with the numerical results, and numerical calculations were performed under experimental conditions of voltages ranging from 1000 V to 5000 V and heat fluxes spanning from 4000W/m2 to 10,000W/m2. The findings reveal a correlation between the establishment of the electroconvection layer and the strength of the electric field force with respect to the temperature gradient. Electroconvection not only enhances heat transfer but also modifies the velocity field of the natural convection, resulting a double vortex flow. The electric field force suppresses vertical thermal convection and alters the direction of the horizontal velocity field. Furthermore, electroconvection augments the heat transfer in free convection, with the cooling effect of high voltage surpassing that of low voltage. The electric field force's enhancing impact on low heat fluxes is comparatively diminished compared to high heat fluxes.

关键词： Electrohydrodynamic Electroconvection Free convection heat transfer enhancement

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An innovative damping random walk algorithm with compulsive evolution for the synthesis of heat exchanger networks

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APPLIED THERMAL engineering 2024年第PartB期248卷

作者： Huang, Xiaohuang Liu, Weiwei Duan, Huanhuan Xu, Yue Xiao, Yuan Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

heat exchanger network synthesis in process system engineering poses a significant challenge, primarily because of the intricacies of stream matches and the nonlinear nature of continuous variables. Numerous heuristic methods are frequently trapped in local optima because of their greedy acceptance criteria, which limits their capacity to explore diverse solutions. This aspect of enhancing algorithms through acceptance Criterion has yet to be considered in previous studies. Hence, a damping strategy using damping perfect solutions is proposed and applied to the Random Walk Algorithm with Compulsive Evolution, which has recently received considerable attention. This strategy aims to prevent trapping in local optima and improve global search capabilities, thereby reducing the risk of premature convergence to the local optima. To address the impact of different damping coefficients within the strategy on the optimization process and structural variations in the algorithm, three damping strategies were designed: a fixed damping strategy with a constant damping coefficient, a variable damping strategy featuring variable damping coefficients at different optimization stages, and an adaptive damping strategy that tracks structural changes and selectively delays modifications driven by continuous variables to preserve those driven by integer variables. The results obtained from applying these strategies to three classical industrial HEN cases are 2,890,884 $/yr, 6,650,082 $/yr, and 1,709,205 $/yr, respectively. These results outperformed the optimal outcomes documented in the literature, demonstrating the effectiveness of the new method.

关键词： heat exchanger network synthesis Total annual cost Structure evolution Damping Random Walk Algorithm with Compulsive Evolution Heuristic method

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Investigation on dynamic characteristics of droplet impact on surfaces with different rough microstructures based on lattice Boltzmann method

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CASE STUDIES IN THERMAL engineering 2024年 63卷

作者： Yang, Jianhua Gao, Ming Dang, Mengyuan Liang, Jia Zhang, Lixin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Constructing microstructures on smooth surfaces is significant for 3D printing technology and surface self-cleaning effects in engineering applications. This paper uses the lattice Boltzmann method (LBM) to study the droplet impact behavior on different microstructured surfaces: righttriangle, semicircular, and rectangular microstructures. The formulas for calculating the surface wetting characteristics of different microstructures are derived theoretically, the difference between simulation results and those from theoretical analyses is less than 5 %. The increase of the microstructure column height h may eventually lead to the disappearance of the Wenzel mode. The droplet impact on the microstructured hydrophilic surface can accelerate the droplet to the stable stage and reduce the excessive impact effect. The droplet impacts on the superhydrophobic microstructured surface can accelerate the rebound separation and shorten the time to reach the stable stage. When droplets impact the superhydrophobic surface of the right-triangle microstructure, a secondary separation phenomenon will occur, resulting in the maximum rebound height and the maximum reduction of the near-wall density. The superhydrophobic right-triangle microstructured surface can more effectively promote self-cleaning.

关键词： Lattice Boltzmann method Droplet impact Microstructure Hydrophilic surface Superhydrophobic surface

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Electrochemical upcycling of biochar particles at anode-electrolyte interface in biochar-assisted water electrolysis for hydrogen production

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CHEMICAL engineering JOURNAL 2024年 498卷

作者： Ying, Zhi Chen, Xinyue Gu, Xufei Sun, Hao Zheng, Xiaoyuan Dou, Binlin Cui, Guomin Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Biochar-assisted water electrolysis (BAWE) exhibits potential in reducing electricity consumption for hydrogen production and is beneficial to biochar upcycling. However, it remains a huge challenge to increase biochar oxidation reaction (BOR) kinetics and deliver upgraded biochar with high selectivity. Herein, we demonstrate the correlation between the BOR kinetics and physicochemical properties of biochar, the laws of energy and mass transfer at anode-electrolyte interface, and the evolution of biochar structure during its electrooxidation. The biochar was derived from the pyrolysis of mixed cellulose and lignin at 500-800 degrees C, and based on Pearson correlation analysis, the physicochemical properties such as functional groups abundance, contact angle, and electric conductivity of biochar showed significant influence on electron transfer rate during biochar oxidation. Oxygen evolution reaction (OER) was found the main competition to BOR, only biochar oxidation occurred at potential below 1.6 V vs. RHE, but OER became dominant at potential above 1.6 V vs. RHE. Biochar underwent three stages including oxygen consumption, oxygen enrichment, and deep oxidation during its electrochemical oxidation. The easily-oxidized carboxyl, hydroxyl, and aldehyde were primarily oxidized, followed by the transformation of methyl into hydroxyl and aldehyde, and aldehyde further oxidized into carboxylic acids and CO2. These findings provide new inspiration on electrochemical upgrading of biochar coupled with efficient hydrogen production.

关键词： Biochar-assisted water electrolysis (BAWE) Biochar Biochar oxidation reaction (BOR) Kinetics Physicochemical properties

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