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)
Review
Chemistry, Multidisciplinary
Nedjeljko Seselj, Silvia M. M. Alfaro, Eftychia Bompolaki, Lars N. N. Cleemann, Tomas Torres, Kobra Azizi
Summary: The constant increase in global emission standards has led to the importance of fuel cell (FC) technology. Research in the past two decades has focused on developing more active catalysts for high-temperature polymer electrolyte membrane fuel cells (HT-PEMFC) and improving their durability. Two main approaches have been suggested: alloying platinum (Pt) with low-cost transition metals to reduce Pt usage, and developing novel catalyst supports to enhance metal particle anchoring and inhibit corrosion phenomena. This comprehensive review details the recent development of platinum group metal (PGM) and platinum group metal free (PGM-free) catalysts, as well as alternative carbon (C) supports for HT-PEMFCs.
ADVANCED MATERIALS
(2023)
Article
Thermodynamics
Kai Meng, Ben Chen, Haoran Zhou, Jun Shen, Zuguo Shen, Zhengkai Tu
Summary: In this research, the durability of a hydrogen-oxygen proton exchange membrane fuel cell was studied through experiments, showing a performance degradation of 31.05% after 2500 loading cycles. The main degradation factors include a decrease in the electrochemical active surface Area and an increase in electrochemical Impedance, along with damage to the catalyst layer and proton exchange membrane.
Review
Chemistry, Physical
Paul C. Okonkwo, Oladeji O. Ige, El Manaa Barhoumi, Paul C. Uzoma, Wilfred Emori, Abdelbaki Benamor, Aboubakr M. Abdullah
Summary: This paper summarizes the degradation of platinum catalyst layer in PEMFCs and the improvement strategies, recommends prospects for addressing platinum degradation through further research, and ultimately reduces the high costs associated with replacing catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Maxwell Tsipoaka, Md Abdul Aziz, Sangaraju Shanmugam
Summary: This study introduces a method of adding cerium titanate nanoparticles to Nafion membranes, significantly reducing membrane degradation and achieving high efficiency in PEM fuel cells under low humidity conditions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Agricultural Engineering
Bin Hou, Rong Zhang, Xiaoyu Liu, Ying Li, Pengxiao Liu, Jing Lu
Summary: This study found that the degradation of phenol and COD in the closed circuit coupling system was higher than that in the open circuit. The micro-electric field can inhibit the growth of TMP and reduce the abundance and species diversity of microorganisms, but cannot completely eliminate membrane fouling.
BIORESOURCE TECHNOLOGY
(2021)
Review
Energy & Fuels
Paul C. Okonkwo, Wilfred Emori, Paul C. Uzoma, Ibrahim B. Mansir, Ahmed Bahgat Radwan, Oladeji O. Ige, Aboubakr M. Abdullah
Summary: This study examines the degradation of graphene coating in PEMFCs and suggests improving material selection to mitigate degradation. The goal is to prevent graphene coating degradation and reduce the high costs associated with replacing bipolar plates in PEMFCs.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Jinqiao Liang, Linhao Fan, Qing Du, Yan Yin, Kui Jiao
Summary: In this study, comprehensive in situ non-accelerated segmented techniques are developed to analyze the degradation mechanisms of PEM fuel cells during cold start at sub-freezing temperatures. A detailed degradation mechanism map is proposed to understand the degradation under different conditions and suppress ice formation. An ideal starting strategy is also developed to achieve cold start without degradation. This study is highly valuable for researchers to understand degradation mechanisms and promote the commercialization of PEM fuel cells.
Article
Engineering, Environmental
Qian Wang, Can He, Yue Shan, Zhongguo Zhang, Jiuyi Li
Summary: The aim of this study was to investigate the degradation efficiency and mechanism of atenolol (ATL) using Al2O3 supported manganese-cerium mixed oxides (Mn-Ce@Al2O3) as a catalyst for catalytic ozonation. Mn-Ce@Al2O3 with 0.2 wt% manganese and 0.2 wt% cerium showed excellent catalytic performance, leading to complete ATL degradation and 63% mineralization. The catalyst had a high specific surface area due to the presence of Mn-Ce solid solution on the surface, which promoted the formation of oxygen vacancies and electron transfer. O-2(center dot-) and center dot OH were identified as the main active radicals for ATL degradation and mineralization.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Xiaokang Yang, Jiaqi Sun, Xiangchao Meng, Shucheng Sun, Zhigang Shao
Summary: This study investigates the degradation mechanism of cold start in proton exchange membrane fuel cells (PEMFCs). It analyzes the degradation behavior through segmented print circuit board technology and local characterizations, and finds that cell performance and current density distribution are severely degraded after 30 cold start failures. The research also reveals that freezing-induced crack formation, Pt particle growth, and ionomer agglomeration are the root causes of freezing damage during cold start.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Polymer Science
Yen -Zen Wang, Yu -Chang Huang, Xian -Yang Fu, Ko-Shan Ho
Summary: In this study, cobalt-doped MDI-based polyurea was synthesized and calcined to obtain Co, N-co-doped carbonaceous cathode catalysts. The Co-MPUr demonstrated high specific surface area and porosity. Comparative experiments revealed that the Co-N-Cs catalyst outperformed commercial Pt/C catalysts in oxygen reduction reaction, exhibiting a higher maximum power density.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Electrochemistry
Michael A. Yandrasits, Sudha Marimannikkuppam, Matthew J. Lindell, Kyle A. Kalstabakken, Michael Kurkowski, Phuc Ha
Summary: Open circuit voltage tests and ion chromatography techniques were used to analyze 3M Ionomer and Nafion(TM) NR211 membranes. The dominant degradation mechanism was found to be the polymer chain end unzipping, while peroxide attack on the sulfonic acid side chain was less relevant. The extraction of tertiary fluorine from the NR211 backbone and side chain was also observed.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Electrochemistry
Alexander Kube, Jens Meyer, Dennis Kopljar, Norbert Wagner, Kaspar Andreas Friedrich
Summary: The study compared the use of transimpedance amplifier and instrumental amplifier circuits to measure current densities of a zinc-air battery, finding the transimpedance amplifier to be superior, but both methods provided valuable and consistent results. The results showed that understanding current distributions is crucial for preventing battery material degradation and irreversible capacity loss.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Ye Peng, Ja-Yeon Choi, Kyoung Bai, Liliang Tian, Shijun Liao, Yi Zhang, Dongchu Chen, Dustin Banham
Summary: Membrane electrode assemblies (MEAs) for proton exchange membrane fuel cell (PEMFC) applications need to endure fuel starvation caused by blockage in the flow field. Recent research has shown that the thickness/structure of the anode layer has a significant impact on anode durability. This study focuses on understanding the mechanism behind this improvement and evaluates the effects of anode layer thickness and spatial distribution of Ir within the anode layer. It is found that thin layers or placing Ir near the gas diffusion layer (GDL) interface result in the longest reversal time.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Hongying Tang, David Aili, Kang Geng, Jian Gao, Qingfeng Li, Nanwen Li
Summary: Polymers containing organic cations are promising materials for high temperature polymer electrolyte membranes due to their high PA retention and wider operation temperature range. However, the stability of these organic cations needs further investigation. By designing and preparing model cations, assessing their stability, and using a blend membrane with PBI and PA, significant progress has been made in developing durable high-performance HT-PEMs for green energy conversion.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Takanori Itoh, Masashi Mori, Manabu Inukai, Hiroaki Nitani, Takashi Yamamoto, Takafumi Miyanaga, Naoki Igawa, Naoto Kitamura, Naoya Ishida, Yasushi Idemoto
JOURNAL OF PHYSICAL CHEMISTRY C
(2015)
Article
Chemistry, Physical
Takanori Itoh, Masashi Mori, Yasushi Idemoto, Hideto Imai, Masanobu Nakayama
SOLID STATE IONICS
(2016)
Article
Nanoscience & Nanotechnology
Kaoru Nakamura, Masashi Mori, Takanori. Itoh, Toshiharu Ohnuma
Article
Chemistry, Inorganic & Nuclear
Takanori Itoh, Yasushi Idemoto, Hideto Imai
JOURNAL OF SOLID STATE CHEMISTRY
(2018)
Article
Physics, Condensed Matter
Takanori Itoh, Hideto Imai
PHYSICA B-CONDENSED MATTER
(2018)
Article
Chemistry, Inorganic & Nuclear
Yosuke Goto, Fumihiko Naito, Rina Sato, Keigo Yoshiyasu, Takanori Itoh, Yoichi Kamihara, Masanori Matoba
INORGANIC CHEMISTRY
(2013)
Article
Electrochemistry
Takanori Itoh, Saori Shirasaki, Hironori Ofuchi, Sayaka Hirayama, Tetsuo Honma, Masashi Mori, Masanobu Nakayama
JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY
(2012)
Article
Electrochemistry
Zhenwei Wang, Masashi Mori, Takanori Itoh
JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY
(2012)
Article
Chemistry, Inorganic & Nuclear
Naoto Kitamura, Takuma Mizoguchi, Takanori Itoh, Yasushi Idemoto
JOURNAL OF SOLID STATE CHEMISTRY
(2014)
Article
Materials Science, Multidisciplinary
Naoto Kitamura, Ryo Muroi, Takanori Itoh, Yasushi Idemoto
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2013)
Article
Chemistry, Multidisciplinary
Masakuni Takahashi, Koji Ohara, Kentaro Yamamoto, Tomoki Uchiyama, Hajime Tanida, Takanori Itoh, Hideto Imai, Seiho Sugawara, Kazuhiko Shinohara, Yoshiharu Uchimoto
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2020)
Article
Multidisciplinary Sciences
Heidy Visbal, Takuya Omura, Kohji Nagashima, Takanori Itoh, Tsukuru Ohwaki, Hideto Imai, Toru Ishigaki, Ayaka Maeno, Katsuaki Suzuki, Hironori Kaji, Kazuyuki Hirao
Summary: Nanoporous mayenite in the hydride state shows potential for hydrogen storage and transportation, with easy desorption of H- ions and 100% recyclability. Various analyses confirmed the presence of hydrogen molecules as H- ions trapped in the structure.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Hiroshi Yano, Naoki Takao, Masazumi Arao, Masashi Matsumoto, Takanori Itoh, Hideto Imai, Akihiro Iiyama, Junji Inukai, Hiroyuki Uchida
ACS APPLIED NANO MATERIALS
(2019)
Article
Nanoscience & Nanotechnology
Daisuke Takimoto, Wataru Sugimoto, Qiuyi Yuan, Naoki Takao, Takanori Itoh, Truong Vinh Truong Duy, Tsukuru Ohwaki, Hideto Imai
ACS APPLIED NANO MATERIALS
(2019)
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)