Article
Electrochemistry
M. Sepe, P. Satjaritanun, I. V. Zenyuk, N. Tippayawong, S. Shimpalee
Summary: The study utilized the lattice Boltzmann method to investigate liquid distribution in GDL samples with the addition of an MPL, revealing that liquid tends to travel through cracks in the MPL surface into the GDL geometry under pressure, resulting in a more even saturation distribution across the sample.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Ceramics
Tianya Li, Guang Chen, Guangyi Lin
Summary: In this study, carbon black and acetylene black are used as conductive materials in the microporous layer (MPL) of the gas diffusion layer (GDL). Four different MPLs with various materials and structures are prepared using the spray method. The performance of these MPLs is compared by testing polarization curve, power density, electrochemical impedance spectroscopy, water permeability, pore size distribution, and water contact angle. The results show that the GDL with a double MPL structure exhibits the highest current and power density. At a humidity of 60%, the limiting current density increases by 41% and power density increases by 30% compared to GDL without a gradient pore size. At a humidity of 100%, the limiting current density increases by 41.3% and power density increases by 50% compared to GDL without a gradient pore size.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Jaebong Sim, Minsoo Kang, Kyoungdoug Min
Summary: This study investigated the effects of ratio variation in the substrate and MPL penetration region on PEMFC performance, finding the optimal ratios for MPL penetration and overall performance. An excessively low substrate ratio can lead to water flooding and hinder gas supply.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Jaebong Sim, Minsoo Kang, Kyoungdoug Min
Summary: The gas diffusion layer (GDL) is a crucial component of proton exchange membrane fuel cells (PEMFCs). By varying the porosity and average pore size of the GDL, as well as the arrangement of perforations on the GDL, the performance of fuel cells can be improved.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Analytical
Rui Jiao Yu, Hang Guo, Hao Chen, Fang Ye
Summary: Porosity is a key parameter affecting the performance of gas diffusion layer in fuel cells. Non-uniform distribution of porosity can better simulate real structure and change cell performance. An optimized three-segment distribution of porosity in anode and cathode sides along three directions at different voltages was explored using a 3D, two-phase agglomerate model, and the reasons for these results at 0.2V, 0.6V and 0.8V were analyzed. The results show that as voltage increases, the average optimal porosity decreases and the porosity increases from inlet to outlet and along width direction. The reaction rate is influenced by reactant content and charge transfer at different regions depending on the voltage.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Thermodynamics
Xiaoqing Zhang, Xiao Ma, Shijin Shuai, Yanzhou Qin, Jiapei Yang
Summary: The study investigates the impact of gas diffusion layer (GDL) and micro-porous layer (MPL) on proton exchange membrane fuel cells (PEMFCs) performance. It is found that the assumption of uniform medium for GDL and MPL may overstate the fuel cells' performance, especially under high inlet relative humidity (RH). The spatially variable properties cause non-uniform distribution of liquid water and saturation peaks in GDL.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Gaojian Chen, Qian Xu, Jin Xuan, Jianguo Liu, Qian Fu, Weidong Shi, Huaneng Su, Lei Xing
Summary: Gas diffusion layers play a critical role in proton exchange membrane fuel cells, and non-uniform deformation can lead to changes in the physical properties of the layers, affecting cell performance. Balancing the degree of deformation in gas diffusion layers can optimize cell performance.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Yi Li, Fang Yuan, Rengang Weng, Fang Xi, Wei Liu
Summary: The porosity distribution in the gas diffusion layer significantly impacts cell performance. An optimized three-dimensional nonuniform porosity distribution is proposed to increase current density and power density. Different design schemes are evaluated, with the optimized porosity distribution showing the best performance.
Article
Chemistry, Physical
Chaoming Li, Dechun Si, Yadi Liu, Jianbo Zhang, Yong Liu
Summary: Electrospun MPL showed better performance under high relative humidities at 70 degrees Celsius, reducing mass transport losses and improving fuel cell efficiency. In cold start conditions, electrospun MPL may facilitate water removal from the catalyst layer, leading to longer electricity generation in fuel cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yinghui Zhang, Youkun Tao, Hong Ren, Minhua Wu, Guanguang Li, Zhijian Wan, Jing Shao
Summary: This study demonstrates a simple and compact design for effective electrons and gas transport in proton exchange membrane fuel cells (PEMFCs) by using a porous metal foam flow media coated with a microporous layer. The design eliminates the conventional gas diffusion layer (GDL) and improves the performance of fuel cells.
JOURNAL OF POWER SOURCES
(2022)
Article
Engineering, Environmental
Fei Wei, Aslan Kosakian, Marc Secanell
Summary: Accurate measurement of water transport in an operating PEMFC is crucial for understanding cell performance. A water balance setup has been developed to track real-time water transport and accumulation in PEMFCs, which indicates that operating conditions and transport layer configurations have a significant impact on water transport. Adding a micro-porous layer to the cathode gas diffusion layer increases water back-diffusion, leading to improved performance at certain operating conditions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Physical
Yange Yang, Xiangyang Zhou, Bing Li, Cunman Zhang
Summary: PEMFCs have become the most attractive power supply units for both stationary and mobile applications. The gas diffusion layer is critical for the operation and design characteristics of PEMFCs, with the microporous layer considered a key variable for mass transfer. However, there is still a lack of special review to summarize recent progress in MPL materials and design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Zhoujian An, Binghao Jian, Xiaoze Du, Che Lei, Minchao Yao, Dong Zhang
Summary: This paper proposes a replacing scheme with porous ridge to address the defects in the traditional slot-rib channel design for PEMFC and the uneven distribution of reaction gas caused by the solid rib. Numerical analysis was conducted to investigate the effects of different height and porosity of the porous ridge on cell performance, membrane current density, temperature characteristic, oxygen content, electrolyte conductivity, and pressure drop distribution. The results show that the channel scheme with porous ridge can effectively improve the mass transfer capacity, accelerate the electrochemical reaction rate, and enhance the fuel cell performance at high current density. The fuel cell output performance is best when the porous ridge height is 1mm and the ridge porosity is 0.8, achieving a 19.55% improvement compared to the conventional slot-rib flow channel.
Article
Chemistry, Physical
Liusheng Xiao, Miaoqi Bian, Zequan Yin, Xiaofei Wen, Chen Zhao, Pang-Chieh Sui, Jinliang Yuan, Houcheng Zhang
Summary: This study proposes an approach to reconstruct heterogeneous gas diffusion layers (GDLs) and conduct pore-scale modeling to evaluate their anisotropic transport properties. The results show that fiber diameter, GDL thickness, and local porosity distribution type have an impact on diffusivity, thermal conductivity, and electrical conductivity. Specific fiber diameter and GDL thickness are recommended to balance diffusivity and thermal-electrical conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Polymer Science
Chongxue Zhao, Haihang Zhang, Zheng Huang, Meng Zhao, Haiming Chen, Guangyi Lin
Summary: In this paper, we report the preparation of a gas diffusion layer (GDL) with different gradient pore size structures. The effects of the two-stage microporous layers (MPL) and the different pore size structures on the performance of proton exchange membrane fuel cells (PEMFC) were investigated. The GDL showed outstanding conductivity and good hydrophobicity. Introducing a pore-making agent altered the pore size distribution of the GDL and increased the capillary pressure difference within the GDL.
Article
Thermodynamics
Suling Zhang, Wei Wu, Shuangfeng Wang
Article
Thermodynamics
Suling Zhang, Wei Wu, Shuangfeng Wang
Article
Thermodynamics
Weixiong Wu, Wei Wu, Shuangfeng Wang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Suling Zhang, Wei Wu, Shuangfeng Wang
Article
Energy & Fuels
Weixiong Wu, Wei Wu, Xianghui Qiu, Shuangfeng Wang
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2019)
Article
Energy & Fuels
Weixiong Wu, Wei Wu, Shuangfeng Wang
Review
Thermodynamics
Weixiong Wu, Shuangfeng Wang, Wei Wu, Kai Chen, Sihui Hong, Yongxin Lai
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Thermodynamics
Bo Yang, Wei Wu, Maodong Li, Wei Zhai
JOURNAL OF THERMAL SCIENCE
(2020)
Article
Thermodynamics
Kai Chen, Junsheng Hou, Mengxuan Song, Shuangfeng Wang, Wei Wu, Yanlai Zhang
Summary: This paper investigates the performance of battery thermal management system with PCM and HP, finding that PCM can effectively reduce the temperature difference in the battery pack. Numerical methods show that increasing environmental convective heat transfer coefficient and PCM thickness can lower the maximum temperature in the battery pack while raising the temperature difference.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Fangju Li, Wei Wu, Shuangfeng Wang
Summary: The wettability modification of gas diffusion layer significantly affects water management and oxygen transport in proton exchange membrane fuel cells. Different hydrophilicity configurations influence liquid water and oxygen transport in gas diffusion layer, and an optimal hydrophilic pore fraction leads to minimum liquid water saturation and maximum limiting current density. Furthermore, oxygen transport is not only related to total liquid water saturation, but also depends on water distribution, with uniform water distribution in the through-plane direction being beneficial for oxygen transport.
JOURNAL OF POWER SOURCES
(2021)
Review
Energy & Fuels
Kangning Xiong, Wei Wu, Shuangfeng Wang, Lin Zhang
Summary: Bipolar plate plays a crucial role in proton exchange membrane fuel cells, and the pursuit of superior bipolar plates has become a technical challenge and future trend. Research shows that the three-dimensional, steady-state, multi-phase, computational fluid dynamics model is the most popular method for evaluating flow field design, with influencing factors such as channel-land dimensions and flow channel shape.
Article
Physics, Fluids & Plasmas
Ninghua Zhan, Rui Wu, Evangelos Tsotsas, Abdolreza Kharaghani
Summary: Pore network modeling is an efficient method for simulating fluid flow and transport in porous media. This study proposes a pore network extraction method based on the omnidirectional Euclidean distance to accurately extract the hierarchy of void voxels in porous media with high aspect ratios.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Thermodynamics
Tengqing Liu, Wentao Yan, Wei Wu, Shuangfeng Wang
Summary: A novel design of thin vapor chamber was proposed with superhydrophilic microstructure to enhance thermal performance. Increasing the laser-etching area ratio resulted in a significant decrease in thermal resistance and an increase in maximum heat transfer capacity of the vapor chambers.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)