Article
Energy & Fuels
Yinghui Zhang, Jing Shao, Youkun Tao
Summary: The structure of porous flow fields in PEMFCs directly affects gas distribution and cell performance. Different designs of porous flow fields and manifold structures play a significant role in improving cell performance and flow distribution. Proper manifold designs and flow field porosity are critical for achieving uniform distribution of reactant and improving cell performance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Peijian Lin, Hongyu Wang, Guodong Wang, Jirui Li, Juncai Sun
Summary: A key-shaped three-dimensional flow channel is designed to improve the performance and mass transfer of proton exchange membrane fuel cell (PEMFC). This study comprehensively analyzes the impacts of the flow channel on performance and mass transfer from multiple dimensions such as block size, shape, and placement. The results show that the new channel with rectangular blocks can effectively improve performance by 30% compared to the conventional straight single flow field channel, and semi-elliptical and quarter-elliptical blocks are designed to enhance forced convection and increase oxygen diffusion area. The study suggests that the Key-shaped design has the potential to improve mass transfer performance in the cathode channel, providing a new strategy for flow field design in the PEMFC field.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Electrochemistry
Guodong Wang, Hongyu Wang, Lei Jiang, Peijian Lin, Jirui Li, Juncai Sun
Summary: This study improves mass transport and performance of proton exchange membrane fuel cells by introducing wave structures and auxiliary flow channels. The dual-region forced convections in the novel flow field enhance the distribution of reactants in the gas diffusion layer, resulting in more even distribution of oxygen, water, and temperature. Compared to the conventional parallel flow field, the new flow field achieves an increase of more than 4% in maximum power density.
Article
Thermodynamics
Shipei Deng, Yinshi Li
Summary: A porous-rib flow field design is proposed for improving the performance of proton exchange membrane fuel cells, leading to increased current density, peak power density, and reduced pressure drop. Operating under fully humidified conditions can further enhance performance.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Xi Chen, Chen Yang, Yun Sun, Qinxiao Liu, Zhongmin Wan, Xiangzhong Kong, Zhengkai Tu, Xiaodong Wang
Summary: In this study, the effects of different structure parameters of nickel metal foam on water management and performance of PEMFC were experimentally investigated. The results showed that the compression ratio and PPI have a significant impact on the performance of PEMFC, and optimizing these parameters can improve the power density and energy conversion efficiency of the fuel cell.
Article
Chemistry, Physical
Zichen Wang, Yuzhen Xia, Hangwei Lei, Guilin Hu
Summary: This study investigates the use of Ni/Sn nanoparticles deposited on the surface of metal foam to enhance its corrosion resistance in proton exchange membrane fuel cells. The coated foam demonstrates improved stability in acid environments and the formation of a uniform and dense protective film.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Electrochemistry
Tatyana Reshetenko, Olga Polevaya
Summary: This study demonstrates the applicability and validity of a novel method for determining oxygen mass transport resistance in proton exchange membrane fuel cells. The method is based on measuring the limiting current when a cathode is fed with highly diluted O-2 mixtures, allowing for separation of different sources of mass transport resistance. Evaluation and comparison of different cell designs under varied conditions reveal the importance of gas phase transport and efficient oxygen diffusion through the ionomer.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Fang-Bor Weng, Mangaliso Menzi Dlamini, Jenn-Jiang Hwang
Summary: Fluid distribution, conduction, and heat control are crucial for fuel cell performance. Metal foam and fine mesh can solve the challenges with straight and serpentine channels. In this study, different flow field designs are compared to improve PEMFC performance. Two foam designs are studied to solve the drawbacks of metal foam caused by high water retention. The fine wire mesh performs best under specific stoichiometry while the metal foam and fine mesh have the potential to drain water droplets and show symmetric fluid flow compared to serpentine design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Chengdai Chen, Changhong Wang, Zhihui Zhang
Summary: A novel cathode flow field design, resembling river diversion drainage, is proposed to solve the issues of channel drainage and under-rib porous layers drainage, and to achieve balanced water management. Compared to the conventional flow field, this new design does not increase pressure drop and improves the net power and oxygen concentration of the proton exchange membrane fuel cell (PEMFC).
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Yu Zhou, Kai Meng, Wenshang Chen, Qihao Deng, Ben Chen
Summary: This paper experimentally demonstrates that the performance of the designed PEMFC with novel flow fields is improved compared to the traditional parallel flow field. A 3D numerical model analysis shows that the ICFF with 3D structural optimization outperforms the OSWFF with 2D structural optimization in terms of water-gas transport characteristics. The ICFF exhibits a 106% increase in effective mass transfer coefficient and a 258% improvement in efficiency evaluation criterion. Moreover, the dual-inlet mode shows a 7% improvement in oxygen uniformity and a 28% improvement in velocity uniformity compared to the single-inlet mode, enhancing the stability of the electrochemical reaction and the distribution of liquid water, thus enhancing PEMFC performance.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Chaochao Cheng, Zirong Yang, Zhi Liu, Chasen Tongsh, Guobin Zhang, Biao Xie, Shaoqing He, Kui Jiao
Summary: The study investigates the feasibility of using metal foam flow field to enhance the performance of anion exchange membrane fuel cells, showing significant improvements in membrane hydration, anode water removal, cathode water utilization, and reactant distribution.
Article
Energy & Fuels
Zhongmin Wan, Hanzhang Yan, Yun Sun, Chen Yang, Xi Chen, Xiangzhong Kong, Yiyu Chen, Zhengkai Tu, Xiaodong Wang
Summary: Through experiments, it has been found that the use of a new cathode flow field with metal foam can improve the thermal management performance and output performance of air-cooled proton exchange membrane fuel cells (PEMFC). The metal foam with a height of 1 mm and a width of 5 mm showed the best performance, with a decrease in temperature by 8.4 degrees Celsius and an increase in output performance by 55.1%. Therefore, it is considered the optimal sample.
Article
Chemistry, Physical
Shuanyang Zhang, Qiguo Yang, Hongtao Xu, Yijun Mao
Summary: An innovative flow channel inspired by the physical structure of the human rib was developed and investigated for its performance in a proton exchange membrane fuel cell (PEMFC). The rib-like flow channel showed higher current density and more uniform concentration distribution, preventing the occurrence of local hot spots. The design of the flow channel also resulted in a higher net power density for the fuel cell.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Wenjie Qi, Xu Tang, Jie Song, Zhigang Zhang, Zehao Huang, Shuaishuai Ge, Jiying Tuo, Junjie Cheng, Shengchang Guo
Summary: The twisted parallel flow field (TPFF) design presented in this study can improve the mass transfer efficiency and output performance of proton exchange membrane fuel cells (PEMFC). By changing the shape of parallelogram and the position of each vertex, TPFF enhances the oxygen transmission efficiency and alleviates flooding phenomenon.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Zhengguo Qin, Wenming Huo, Zhiming Bao, Chasen Tongsh, Bowen Wang, Qing Du, Kui Jiao
Summary: A universal alternating flow field design is proposed in this study to improve the gas transfer rate and performance of proton exchange membrane fuel cells (PEMFC). The design offers additional options for flow field optimization and contributes to the early achievement of next-generation ultrahigh power density fuel cells.
Article
Thermodynamics
A. Fly, I Kirkpatrick, R. Chen
Summary: The performance of electrochemical energy storage technologies is strongly affected by temperature, with lithium-ion batteries showing the highest energy and power densities down to -30°C. Lead-acid cells provide the highest energy density and supercapacitors offer the highest power density at lower temperatures. A new simplified empirical method for lithium-ion cells to determine the optimum pre-heating temperature for maximum net energy output is introduced.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Ren Zhang, Lin Chen, Haiqiao Wei, Jiaying Pan, Jinguang Li, Penghui Yang, Rui Chen
Summary: The study shows that direct-injected hydrogen can significantly improve the combustion instability and power capability of natural gas engines by fast flame propagation. Additionally, late injection of direct-injected hydrogen can achieve higher thermal efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Mengshan Suo, Kai Sun, Rui Chen, Zhizhao Che, Zhen Zeng, Qifeng Li, Xingxiao Tao, Tianyou Wang
Summary: Metal foam flow fields have the potential to enhance oxygen mass transfer to the catalyst layer and improve oxygen distribution homogeneity in PEM fuel cells. Decreasing metal foam porosity may lead to nonmonotonic variation in oxygen mass transfer rate, while increasing pore density and compression ratio can enhance oxygen mass transfer, especially at high inlet velocities. The insights from this study could be valuable for the implementation of metal foam flow fields in PEM fuel cells.
JOURNAL OF POWER SOURCES
(2022)
Article
Computer Science, Artificial Intelligence
Yiyao Zhou, Rui Chen, Yiqiang Zhao, Xiding Ai, Guoqing Zhou
Summary: This paper proposes a novel point cloud denoising algorithm based on non-local self-similarity characteristics, which utilizes adaptive curvature threshold and structure-aware descriptor to preserve structure and achieve high-quality reconstruction. The experiments show that the algorithm outperforms state-of-the-art methods in terms of reconstruction accuracy and structure preservation.
PATTERN RECOGNITION
(2021)
Article
Environmental Sciences
Li Shen, Yao Lu, Hao Chen, Hao Wei, Donghai Xie, Jiabao Yue, Rui Chen, Shouye Lv, Bitao Jiang
Summary: This study introduces a building-change-detection dataset named S2Looking, which consists of large-scale side-looking satellite images and tens of thousands of annotated change instances, for training deep-learning algorithms. The dataset offers larger viewing angles, illumination variances, and complexity of rural images compared to existing datasets, and preliminary tests suggest higher level of challenges for deep-learning algorithms.
Article
Chemistry, Physical
Zhen Zeng, Tianyou Wang, Rui Chen, Mengshan Suo, Kai Sun, Panagiotis E. Theodorakis, Zhizhao Che
Summary: This study investigates the formation mechanism of multidirectional partitioned square icing patterns using molecular dynamics simulations. The researchers propose square icing parameters to distinguish partitioned patterns from homogeneous patterns and liquid water. It is found that the number of graphene monolayers influences the formation of partitioned patterns, with greater energetically favorable conditions for confinement between multiple graphene sheets. The interaction between layers of water molecules is identified as another dominant factor. The study also explores the conversion from partitioned structures to homogeneous square patterns by manipulating pressure and temperature.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Buddhi Wimarshana, Izzuan Bin-Mat-Arishad, Ashley Fly
Summary: Physico-chemical battery models are capable of simulating lithium-ion cell behavior more accurately by using a more physically descriptive modeling approach. This study demonstrates an improvement in parameter identification accuracy by analyzing the sensitivity of both discharge voltage and EIS data. Different parameters show different sensitivity patterns, and the introduction of non-dimensional EIS spectra states allows for accurate identification of impedance-based parameter sensitivities.
JOURNAL OF POWER SOURCES
(2022)
Article
Mechanics
Lijia Zhong, Lei Zhou, Peilin Liu, Xiaojun Zhang, Kuangdi Li, Rui Chen, Haiqiao Wei
Summary: The present work investigates the influence of fuel and diluent gas reactivity on end-gas autoignition and detonation development. It is found that both chemical reactivity and shock wave have significant effects on these processes. Different fuels and diluent gases show varying transition thresholds for self-ignition and detonation development. The study also reveals that fuel with shorter ignition delay requires lower flame tip velocity and experiences delayed detonation occurrence. The transition thresholds are determined by both chemical reactivity and flame speed.
Review
Energy & Fuels
Suprava Chakraborty, Devaraj Elangovan, Karthikeyan Palaniswamy, Ashley Fly, Dineshkumar Ravi, Denis Ashok Sathia Seelan, Thundil Karuppa Raj Rajagopal
Summary: Climate change is the major challenge faced by the world today, and zero carbon emission vehicles are recommended for the future. Proton exchange membrane fuel cells (PEMFC) are an alternative source of automotive mobility with zero carbon emissions and higher efficiency than combustion engines. This review article provides an overview of the background, working principles, challenges, and applications of PEMFCs, as well as an in-depth analysis of different flow channel designs.
Article
Chemistry, Physical
Milon Miah, Poulami Hota, Tapas Kumar Mondal, Rui Chen, Shyamal K. Saha
Summary: This study explores the application of mixed metal sulfides as electrode materials for supercapacitors. FeNiS2 nanosheets are synthesized and decorated on rGO surface. The results show that FeNiS2 decorated on rGO exhibits high specific capacitance and capacity retention, indicating its potential in the field of supercapacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Thanarajan Kumaresan, Karthikeyan Palaniswamy, Ashley Fly, Senthilarasu Sundaram
Summary: This research investigates the performance of a single cell Direct Methanol Fuel Cell with different mass compositions of platinum at the anode and various cathode flow fields. The results show that a 40% platinum mass composition and a sinuous flow field provide the best performance. However, scaling up the best combination to a larger active area results in decreased performance.
Article
Energy & Fuels
Zexin Huang, Matt Best, James Knowles, Ashley Fly
Summary: Battery modelling is crucial for battery management tasks. The paper proposes a self-adaptive Piecewise Equivalent Circuit Model (PECM) based on Extended Kalman Filter (EKF), which can adapt to varying operating conditions in real time. PECM continuously adjusts its model parameters based on voltage, current, and temperature measurements. It is accurate, flexible, and efficient, and doesn't require prior lab tests such as OCV calibration.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2023)
Article
Chemistry, Physical
Buddhi Wimarshana, Izzuan Bin-Mat-Arishad, Ashley Fly
Summary: Physico-chemical battery models are widely used in the design and simulation of lithium-ion batteries. However, accurate identification of model parameters is challenging and expensive. This study proposes a novel electrochemical impedance spectroscopy (EIS) based data-driven parameter identification framework to improve the accuracy of a physico-chemical battery model using particle swarm optimization. The results show significant improvements in voltage prediction compared to previous experimental parameter sets.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Haosong He, Xiangjie Chen, Ashley Fly, Vishal Saini
Summary: In this study, a new approach (FAED approach) is proposed to fit the temperature-sensitive parameters and corresponding activation energies to experimental data with a single discharge process, reducing the testing time and enabling effective thermal analysis of EV batteries.
JOURNAL OF POWER SOURCES
(2023)
Review
Computer Science, Information Systems
Probir Kumar Roy, Mohammad Shahjalal, Tamanna Shams, Ashley Fly, Stoyan Stoyanov, Mominul Ahsan, Julfikar Haider
Summary: Due to concerns about greenhouse gas emissions, global warming, and the depletion of fossil resources, electric vehicles have gained rapid acceptance as a viable alternative for reducing CO2 emissions. This paper provides a brief review of key battery management system (BMS) technologies, as well as aging processes and estimation techniques for lithium-ion batteries.
