Article
Chemistry, Physical
Wu Yujing, Zhou Hongxiu, Zhang Ao, Zhao Leqing
Summary: The research shows that flowing electrode direct methanol fuel cell (FEDMFC) effectively reduces methanol crossover rate while maintaining high power densities. Increasing flow rate can decrease crossover rate but will affect efficiency and stability, with optimal flow rate controlled at 1-3 sccm.
JOURNAL OF POWER SOURCES
(2022)
Article
Green & Sustainable Science & Technology
Jing Zhou, Jiamu Cao, Yufeng Zhang, Junfeng Liu, Junyu Chen, Mingxue Li, Weiqi Wang, Xiaowei Liu
Summary: This paper discusses the Chinese government's policies supporting methanol fuel applications and the vast potential of direct methanol fuel cells in the era of green development. It highlights the importance of reducing the methanol permeability of polymer electrolyte membranes as a fundamental way to lessen or eliminate methanol crossover.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Chemistry, Physical
Qianwen Tang, Bing Li, Daijun Yang, Pingwen Ming, Cunman Zhang, Yanbo Wang
Summary: The article reviews the literature on hydrogen crossover in PEMFC, covering consequences, causes, mitigation measures, and detection methods. It discusses the influences of hydrogen crossover on the components and performance, analyzes the causes, and summarizes methods to alleviate membrane degradation. Various monitoring methods are described, providing a foundation for further research and improvement in fuel cell durability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Electrochemistry
Zhen Li, Xiaofeng Hao, Min Xiao, Sheng Huang, Dongmei Han, Shuanjin Wang, Yuezhong Meng
Summary: A novel bifunctional polyhedral oligomeric silsesquioxane (Vi-POSS-SO3Na) and a surface densification method based on sulfonated poly (fluorenyl etherketone) (SPFEK) were reported for direct methanol fuel cells (DMFCs) application. The synthetic Vi-POSS-SO3Na was implanted on the SPFEK surface by a swelling-filling process and then cross-linked to form a dense X-POSS layer through thermal treatment. The X-POSS layer with sulfonated groups effectively prevents methanol permeation and enhances oxidative stability without sacrificing proton conductivity.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jiho Min, Sungmin Kim, Arokia Anto Jeffery, Hyeyoung Shin, Yun Sik Kang, Youngjin Kim, Jeonghee Jang, Seunghyun Lee, Seok-Hee Park, Gu-Gon Park, Sung Jong Yoo, Sung-Dae Yim, Namgee Jung
Summary: By introducing a defect-controlled carbon molecular sieve layer, high CO tolerance and stability of PtRu catalysts can be achieved.
MATERIALS TODAY ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Li Liang, Zuo Zicheng, He Feng, Jiang Zhongqing, Li Yuliang
Summary: An ultrathin layer of nitrogen-rich GDY film is prepared to retard methanol permeation in direct methanol fuel cells, significantly increasing selective suppression of methanol transfer and improving power performance and long-term stability of the cell.
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
(2021)
Article
Thermodynamics
Tiankuo Chu, Qianwen Tang, Qinpu Wang, Yanbo Wang, Hong Du, YuQing Guo, Bing Li, Daijun Yang, Pingwen Ming, Cunman Zhang
Summary: In this study, durability tests were conducted on two stacks with different channel depths of PEMFC for 1000 h on a 1 kW fuel cell stack test platform. The overall performance change of the stack was detected and the membrane electrode assembly was characterized. The mechanism of membrane degradation and hydrogen crossover was analyzed using first principle calculation, and some durability experimental results were explained. Results showed that the durability of the PEMFC with a shallow flow channel was worse, with significant voltage drops and increased hydrogen crossover after 500 h. The chemical structure change of the membrane caused by free radical attack was revealed by the first principle calculation. This paper reveals the mechanism of hydrogen crossover and its influence on the catalyst layer, offering insights to improve the durability of PEMFC.
Review
Polymer Science
Gowthami Palanisamy, Tae Hwan Oh, Sadhasivam Thangarasu
Summary: A direct methanol fuel cell (DMFC) is an excellent energy device that converts methanol to energy with high efficiency. Commercial membranes for DMFCs are expensive and have high methanol permeability, but novel developments using cost-effective cellulose-based materials have improved performance. In this review, the advances and utilization of different cellulose materials as proton-exchange membranes (PEMs) for DMFCs are discussed, including cellulose derivatives and composites with inorganic additives.
Article
Engineering, Chemical
Xiaoyan Ji, Yan Bao, Conghui Du, Qiuhui Shi, Wenlong Xu, Zhining Wang
Summary: Researchers have successfully prepared a two-dimensional zeolite membrane with a layered structure and demonstrated its potential application in water treatment. The membrane has good water permeability, high rejection rate, and excellent stability.
Article
Chemistry, Physical
Satoshi Sakaida, Mana Sugiyama, Ryuya Nagayama, Kotaro Tanaka, Mitsuru Konno
Summary: This study investigated the fuel crossover characteristics of oxymethylene dimethyl ether (OME) in polymer electrolyte fuel cells, and found that the fully hydrolyzed OME (h-OME) has a lower fuel crossover rate compared to direct methanol fuel cells (DMFC), leading to higher cell performance at high fuel concentrations. The effective diffusion coefficient of h-OME in the membrane decreased with increased fuel concentration, resulting in the low fuel crossover rate at high h-OME concentrations.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Tushita Rohilla, Ahmad Husain, Narinder Singh, Dhiraj K. Mahajan
Summary: Polymer Electrolyte Membrane (PEM) is crucial for the overall performance of fuel cells. Currently available membranes have limitations in high temperature and low humidity operations. This study designs two novel hydrocarbon-based PEMs and compares their properties with commercially available ionomers. MD simulations reveal that non-fluorinated SPI exhibits the highest proton conductivity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Can Xu, Weichen Wei, Yong He
Summary: The hydrogen separation performance of molecular sieving membranes was significantly enhanced through ion exchange, showing great potential for application in hydrogen purification.
Article
Chemistry, Multidisciplinary
Huijun Yang, Yu Qiao, Zhi Chang, Han Deng, Xingyu Zhu, Ruijie Zhu, Zetao Xiong, Ping He, Haoshen Zhou
Summary: The zeolite molecular sieve-modified aqueous electrolyte shows reduced water activity and side reactions, leading to improved performance at the electrolyte/electrode interface. This modification results in less hydrogen evolution and corrosion, as well as better cycle life and stability of the battery cells.
ADVANCED MATERIALS
(2021)
Review
Polymer Science
Zulfirdaus Zakaria, Siti Kartom Kamarudin, Khairul Anwar Abd Wahid
Summary: This paper comprehensively reviews the recent progress in developing polymer electrolyte membranes for the application of direct ethanol fuel cells (DEFCs). It focuses on the updated modification of polymeric materials and discusses the factors and challenges that affect the performance of polymer electrolyte membranes.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Arunkumar Jayakumar, Dinesh Kumar Madheswaran, Nallapaneni Manoj Kumar
Summary: DMFC, a subset of PEMFC, offers benefits like fuel flexibility and benign operation, but faces challenges of degradation and inadequate reliability. Understanding the degradation mechanisms of MEA is crucial for commercialization.