Article
Engineering, Mechanical
Shouwen Shi, Jiayao Li, Bingshuang Gao, Hailong Dai, Qiang Lin, Xu Chen
Summary: The study indicates that the catalyst layer can delay the initiation of fatigue cracks in PFSA membranes, thereby improving their fatigue life. Cracks can initiate simultaneously on both surfaces of the Nafion 212 membrane.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Chemistry, Physical
Michael Obermaier, Krzysztof Jozwiak, Markus Rauber, Andreas Bauer, Christina Scheu
Summary: The knowledge gained from fuel cell degradation analysis is critical for achieving durability targets and commercializing polymer electrolyte membrane fuel cells, depending on the dominant degradation mode. This study systematically investigates four potential methods for detecting pinholes in the polymer membrane. Detection limits, material system impacts, and other relevant factors are discussed to optimize defect detection and make recommendations for practical application.
JOURNAL OF POWER SOURCES
(2021)
Article
Materials Science, Characterization & Testing
Qiang Lin, Yihao Yao, Gang Chen, Xu Chen, Shouwen Shi
Summary: A customized pressure-loaded blister test device was developed to investigate the biaxial fatigue durability of PEM for fuel cells. The study found that increasing pressure and temperature, as well as decreasing humidity, adversely affected the biaxial fatigue lifetime of the membrane. Lowering temperature also led to a transition in the failure mode.
Article
Polymer Science
Jun Hyun Lim, Jian Hou, Chang Hyun Lee
Summary: This study presents an innovative PBS-GC system to assess the mechanical fatigue of commercial Nafion membranes under PEMFC operating conditions. Results indicate that hydrogen gas is more effective in inducing mechanical losses, confirmed by changes in proton conductivity and hydrogen permeability after aging tests. The developed system demonstrates the capability of screening and characterizing membrane candidates in a relatively short period of time.
Article
Engineering, Mechanical
Shouwen Shi, Jiayao Li, Haiyan Li, Yihao Yao, Hailong Dai, Yuanjie Fu, Qiang Lin, Xu Chen
Summary: The fatigue crack growth behaviors of two fuel membranes were investigated at different temperatures. The results show that the fatigue crack growth rate increases with temperature, and the Nafion XL membrane is more sensitive to temperature. An Arrhenius-type expression for fatigue crack growth rate was proposed and yielded good prediction results. For the Nafion XL composite membrane, fatigue crack grows by forming micropores ahead of the crack tip. These micropores are formed due to the combined action of hygrothermal environment and mechanical stress, which increase with temperature. Besides, the interior micropores and microstructure changes in the reinforcement layer also account for the higher temperature sensitivity of the Nafion XL membrane.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Morshed Hasan, Jixin Chen, James R. Waldecker, Michael H. Santare
Summary: Limited mechanical durability is a critical issue for polymer electrolyte membrane fuel cells (PEMFCs) in automotive applications. In this study, three relative humidity (RH) cycling tests were simulated for a reinforced membrane. Using experimental data and a finite element model, the resistance to crack initiation in the membrane was calculated and used to predict the cycle-to-failure under different experimental conditions. The numerical analysis showed satisfactory agreement with experimental data, demonstrating the potential of this model-based approach to reduce resources and time needed for evaluating the mechanical integrity of modern membranes.
JOURNAL OF POWER SOURCES
(2022)
Review
Chemistry, Physical
E. Pahon, D. Hissel, N. Yousfi-Steiner
Summary: This paper reviews the accelerated stress testing in fuel cell stack testing, including degradation mechanisms and testing protocols for different components. In addition to the standardized testing methods provided by the Department of Energy, other recent testing protocols are also reviewed.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Rui B. Ferreira, D. S. Falcao, A. M. F. R. Pinto
Summary: The study simulated membrane chemical degradation in proton exchange membrane (PEM) fuel cells using computational fluid dynamics (CFD). Results showed that degradation is accelerated by increased voltage, temperature, pressure, decreased reactant humidity and membrane thickness. Additionally, degradation is more severe with higher oxygen pressure and more heterogeneous with less uniform oxygen distribution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Kun Wang, Ning Li, Yanan Yang, Shaojie Ke, Zhengping Zhang, Meiling Dou, Feng Wang
Summary: Under simulated automotive load-cycling operation, higher load amplitude leads to more severe degradation of fuel cell performance, mainly due to the faster growth of Pt nanoparticles in the cathodic catalyst layer and resulting degradation of the catalyst. Additionally, detected microstructure changes in the cathodic catalyst layer contribute to performance failure.
CHINESE CHEMICAL LETTERS
(2021)
Article
Energy & Fuels
Yange Yang, Xiangyang Zhou, Bing Li, Cunman Zhang
Summary: This study conducted in-situ durability tests on gas diffusion layers in proton exchange membrane fuel cells under actual working conditions, finding that degradation of the gas diffusion layer is a major factor contributing to decreased power density in the stack. It offers new insights for investigating the durability of stacks and gas diffusion layers.
Article
Energy & Fuels
Qian Zhang, Mathias Schulze, Pawel Gazdzicki, K. Andreas Friedrich
Summary: This study analyzed the impact of three recovery procedures on the performance of polymer electrolyte membrane fuel cells. The research found that these procedures can effectively recover performance losses at high current densities, but show significant differences at lower current densities. The JRC protocol recovers kinetic losses by reducing the cathode potential and fuel cell temperature, while the DOE protocol has relatively poorer recovery effects.
Article
Chemistry, Physical
Qian Zhang, Mathias Schulze, Pawel Gazdzicki, K. Andreas Friedrich
Summary: This study presents a methodology for quantifying the recovery of reversible voltage losses in polymer electrolyte membrane fuel cells, and evaluates the influence of different recovery procedures on fuel cell performance. Results show that using polarization curves and voltage data logged during load cycling lead to the same recovery outcomes, indicating that in-depth electrochemical characterization may not be necessary for assessing recovery efficiency. EIS data are used to determine the main mechanisms leading to recovery, identifying weaknesses in specific recovery procedures for proposing improvements.
JOURNAL OF POWER SOURCES
(2021)
Review
Energy & Fuels
J. Aubry, N. Yousfi Steiner, S. Morando, N. Zerhouni, D. Hissel
Summary: Fuel cell durability is crucial for the technology industrialization in the automotive sector, and fault tolerant control process can improve the durability by detecting and correcting fuel cell faults in real time. This article focuses on the diagnosis part of fault tolerant control in vehicle application, including real time measurements, useful information extraction, and classification. Vehicle applications have various constraints such as cost reduction, hydrogen usage, computation limitations, and safety regulations.
Article
Chemistry, Physical
E. Pahon, D. Bouquain, D. Hissel, A. Rouet, C. Vacquier
Summary: This study analyzed the degradation mechanisms of a fuel cell stack during start/stop cycling using polarization curves and electrochemical impedance spectra. The carbon support of the catalyst layer was identified as the main constituent that suffers performance degradation. As the number of cycle repetitions increased, the charge transfer and mass transfer resistances both drastically increased.
JOURNAL OF POWER SOURCES
(2021)
Article
Electrochemistry
F. Kukk, S. Pylypko, E. Lust, G. Nurk
Summary: This study examines the effect of different thicknesses of hydrogen electrode active layer on the performance of reversible solid oxide cells. The results show that cells with an active layer thickness ranging from 7 to 16μm perform the best under specific operating conditions.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Mechanics
Yifan Huang, R. K. N. D. Rajapakse
ENGINEERING FRACTURE MECHANICS
(2018)
Article
Engineering, Mechanical
D. A. Damasceno, E. Mesquita, R. K. N. D. Rajapakse, R. Pavanello
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2019)
Article
Engineering, Mechanical
Y. Sapsathiarn, R. K. N. D. Rajapakse
JOURNAL OF ENGINEERING MECHANICS
(2018)
Article
Materials Science, Multidisciplinary
Manura Liyanage, Ronald Miller, R. K. N. D. Rajapakse
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2018)
Article
Instruments & Instrumentation
Manura Liyanage, Ronald Miller, R. K. N. D. Rajapakse
SMART MATERIALS AND STRUCTURES
(2019)
Article
Chemistry, Physical
Yadvinder Singh, Ramin M. H. Khorasany, Will H. J. Kim, Alireza Sadeghi Alavijeh, Erik Kjeang, R. K. N. D. Rajapakse, G. Gary Wang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Engineering, Mechanical
Yifan Huang, R. K. N. D. Rajapakse
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2019)
Article
Mechanics
S. Tirapat, T. Senjuntichai, J. Rungainornrat, R. K. N. D. Rajapakse
Article
Mechanics
D. A. Damasceno, R. K. N. D. Rajapakse, E. Mesquita, R. Pavanello
Article
Chemistry, Physical
M. A. N. Dewapriya, R. K. N. D. Rajapakse, W. P. S. Dias
Article
Computer Science, Interdisciplinary Applications
Teerapong Senjuntichai, Suraparb Keawsawasvong, R. K. N. D. Rajapakse
COMPUTERS AND GEOTECHNICS
(2020)
Article
Chemistry, Multidisciplinary
Daniela A. Damasceno, R. K. N. D. Nimal Rajapakse, Euclides Mesquita
Article
Engineering, Geological
Teerapong Senjuntichai, Suraparb Keawsawasvong, R. K. N. D. Rajapakse
Summary: This paper investigates the vertical vibrations of a group of flexible strip foundations on multilayered transversely isotropic poroelastic soils using a variational approach. Exact stiffness matrices for each layer and the half-plane are derived in Fourier transform space for the first time, showing the influence of governing parameters on dynamic interaction between foundations.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Proceedings Paper
Engineering, Civil
Y. Sapsathiarn, R. K. N. D. Rajapakse
ADVANCES IN ENGINEERING MATERIALS, STRUCTURES AND SYSTEMS: INNOVATIONS, MECHANICS AND APPLICATIONS
(2019)
Proceedings Paper
Engineering, Civil
S. Tirapat, T. Senjuntichai, J. Rungamornrat, R. K. N. D. Rajapakse
2018 3RD INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING AND MATERIALS SCIENCE (ICCEMS 2018)
(2018)
Article
Chemistry, Physical
Tianyu Chen, Zhibin Lu, Guangjin Zeng, Yongmin Xie, Jie Xiao, Zhifeng Xu
Summary: The study introduces a high-performance LSGM electrolyte-supported tubular DC-SOFC stack for portable applications, which shows great potential in developing into high-performing, efficient, and environmentally friendly portable power sources for distributed applications.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Wenbin Tong, Yili Chen, Shijie Gong, Shaokun Zhu, Jie Tian, Jiaqian Qin, Wenyong Chen, Shuanghong Chen
Summary: In this study, a three-dimensional porous NiO interface layer with enhanced anode dynamics is fabricated, forming a Schottky contact with the zinc substrate, allowing rapid and uniform zinc plating both inside and below the interface layer. The resulting NiO@Zn exhibits exceptional stability and high capacity retention.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yafeng Bai, Kaidi Li, Liying Wang, Yang Gao, Xuesong Li, Xijia Yang, Wei Lu
Summary: In this study, a flexible zinc ion supercapacitor with gel electrolytes, porous alpha-MnO2@reduced graphene oxide cathode, and activated carbon/carbon cloth anode was developed. The device exhibits excellent electrochemical performance and stability, even at low temperatures, with a high cycle retention rate after 5000 cycles.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Anmol Jnawali, Matt D. R. Kok, Francesco Iacoviello, Daniel J. L. Brett, Paul R. Shearing
Summary: This article presents the results of a systematic study on the electrochemical performance and mechanical changes in two types of commercial batteries with different anode chemistry. The study reveals that the swelling of anode layers in batteries with silicon-based components causes deformations in the jelly roll structure, but the presence of a small percentage of silicon does not significantly impact the cycling performance of the cells within the relevant state-of-health range for electric vehicles (EVs). The research suggests that there is room for improving the cell capacities by increasing the silicon loading in composite anodes to meet the increasing demands on EVs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yohandys A. Zulueta, My Phuong Pham-Ho, Minh Tho Nguyen
Summary: Advanced atomistic simulations were used to study ion transport in the Na- and K-doped lithium disilicate Li2Si2O5. The results showed that Na and K doping significantly enhanced Li ion diffusion and conduction in the material.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Zongying Han, Hui Dong, Yanru Yang, Hao Yu, Zhibin Yang
Summary: An efficient phase inversion-impregnation approach is developed to fabricate BaO-decorated Ni8 mol% YSZ anode-supported tubular solid oxide fuel cells (SOFCs) with anti-coking properties. BaO nanoislands are successfully introduced inside the Ni-YSZ anode, leading to higher peak power densities and improved stability in methane fuel. Density functional theory calculations suggest that the loading of BaO nanoislands facilitates carbon elimination by capturing and dissociating H2O molecules to generate OH.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Suresh Mamidi, Dan Na, Baeksang Yoon, Henu Sharma, Anil D. Pathak, Kisor Kumar Sahu, Dae Young Lee, Cheul-Ro Lee, Inseok Seo
Summary: Li-CO2 batteries, which utilize CO2 and have a high energy density, are hindered in practical applications due to slow kinetics and safety hazards. This study introduces a stable and highly conductive ceramic-based solid electrolyte and a metal-organic framework catalyst to improve the safety and performance of Li-CO2 batteries. The optimized Li-CO2 cell shows outstanding specific capacity and cycle life, and the post-cycling analysis reveals the degradation mechanism of the electrodes. First-principles calculations based on density functional theory are also performed to understand the interactions between the catalyst and the host electrode. This research demonstrates the potential of MOF cathode catalyst for stable operation in Li-CO2 batteries.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Ganghua Xiang, Zhihuan Qiu, Huilong Fei, Zhigang Liu, Shuangfeng Yin, Yuen Wu
Summary: In this study, a CeFeOx-supported Pt single atoms and subnanometric clusters catalyst was developed, which exhibits enhanced catalytic activity and stability for the preferential oxidation of CO in H2-rich stream through synergistic effect.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Dimitrios Chatzogiannakis, Marcus Fehse, Maria Angeles Cabanero, Natalia Romano, Ashley Black, Damien Saurel, M. Rosa Palacin, Montse Casas-Cabanas
Summary: By coupling electrochemical testing to operando synchrotron based X-ray absorption and powder diffraction experiments, blended positive electrodes consisting of LiMn2O4 spinel (LMO) and layered LiNi0.5Mn0.3Co0.2O2 (NMC) were studied to understand their redox mechanism. It was found that blending NMC with LMO can enhance energy density at high rates, with the blend containing 25% LMO showing the best performance. Testing with a special electrochemical setup revealed that the effective current load on each blend component can vary significantly from the nominal rate and also changes with SoC. Operando studies allowed monitoring of the oxidation state evolution and changes in crystal structure, in line with the expected behavior of individual components considering their electrochemical current loads.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Chiara Cementon, Daniel Dewar, Thrinathreddy Ramireddy, Michael Brennan, Alexey M. Glushenkov
Summary: This Perspective discusses the specific power and power density of lithium-ion capacitors, highlighting the fact that their power characteristics are often underestimated. Through analysis, it is found that lithium-ion capacitors can usually achieve power densities superior to electrochemical supercapacitors, making them excellent alternatives to supercapacitors.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Weihao Wang, Hao Yu, Li Ma, Youquan Zhang, Yuejiao Chen, Libao Chen, Guichao Kuang, Liangjun Zhou, Weifeng Wei
Summary: This study achieved an improved electrolyte with excellent low-temperature and high-voltage performance by regulating the Li+ solvation structure and highly concentrating it. The electrolyte exhibited outstanding oxidation potential and high ionic conductivity under low temperature and high voltage conditions, providing a promising approach for the practical application of high-voltage LIBs.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Martin Bures, Dan Gotz, Jiri Charvat, Milos Svoboda, Jaromir Pocedic, Juraj Kosek, Alexandr Zubov, Petr Mazur
Summary: Vanadium redox flow battery is a promising energy storage solution with long-term durability, non-flammability, and high overall efficiency. Researchers have developed a mathematical model to simulate the charge-discharge cycling of the battery, and found that hydraulic connection of electrolyte tanks is the most effective strategy to reduce capacity losses, achieving a 69% reduction.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
M. Rodriguez-Gomez, J. Campo, A. Orera, F. de La Fuente, J. Valenciano, H. Fricke, D. S. Hussey, Y. Chen, D. Yu, K. An, A. Larrea
Summary: In this study, we analysed the operando performance of industrial lead cells using neutron diffraction experiments. The experiments revealed the evolution of different phases in the positive electrode, showed significant inhomogeneity of phase distribution inside the electrode, and estimated the energy efficiency of the cells.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Jiawei Liu, Chenpeng Wang, Yue Yao, Hao Ye, Yinglong Liu, Yingli Liu, Xiaoru Xu, Zhicong Chen, Huazheng Yang, Gang Wu, Libin Lei, Chao Wang, Bo Liang
Summary: The study focuses on utilizing double conductive Ni-pads as anode collectors in micro-tubular solid oxide fuel cells. The simulation results show excellent performance and stability of DCNPs, and also highlight the potential applications in various fields.
JOURNAL OF POWER SOURCES
(2024)
Article
Chemistry, Physical
Yang Wang, Kangjie Zhou, Lang Cui, Jiabing Mei, Shengnan Li, Le Li, Wei Fan, Longsheng Zhang, Tianxi Liu
Summary: This study presents a polyimide sandwiched separator (s-PIF) for improving the cycling stability of Li-metal batteries. The s-PIF separator exhibits superior mechanical property, electrolyte adsorption/retention and ion conductivity, and enables dendrite-free Li plating/stripping process.
JOURNAL OF POWER SOURCES
(2024)