通讯机构：
[Junsheng Yang] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, Hubei, China
摘要：
Exploring highly efficient and durable catalysts for the hydrogen evolution reaction (HER) is crucial for the hydrogen economy and environmental protection issues. Numerous studies have now found that transition metal carbide MXenes are ideal candidates as catalysts for the hydrogen evolution reaction. However, MXenes are inclined to easily undergo lamellar structure agglomeration and stacking, which impedes their further applications. Besides, most of the extant research has focused on single transition metal carbides, and the investigation of double transition metal carbide MXenes is rather rare. In this research work, a three-dimensional (3D) TiVCTx-based conductive electrode was constructed by depositing 2D TiVCTx nanosheets on 3D network structured nickel foam (NF) to synthesize a hybrid electrode material (abbreviated as TiVCTx@NF). TiVCTx@NF exhibits efficient electrochemical properties with a low overpotential of 151 mV at 10 mA cm(-2) and a small Tafel slope of 116 mV dec(-1). Benefitting from the open layer structure and strong interfacial coupling effect, compared to the pristine structure, the resulting TiVCTx@NF has greatly increased active sites for the hydrogen evolution reaction (HER) and encounters less resistance for charge transfer. In addition, TiVCTx@NF exhibits better stability in long-term acidic electrolytes. This work provides a tactic to prepare three-dimensional network electrode materials and broadens the application of single transition metal carbide MXenes as water splitting electrodes in the HER, which is beneficial to the application of noble metal-free electrocatalysts.
通讯作者：
Qiang Luo<&wdkj&>Qiang Luo Qiang Luo Qiang Luo
作者机构：
[Luo, Qiang; Wu, Yan; Chen, Jibing] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430048, Peoples R China.;[Cai, Qizhou] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Dies & Mould Technol, Wuhan, Peoples R China.
通讯机构：
[Qiang Luo; Qiang Luo Qiang Luo Qiang Luo] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
摘要：
One of the methods for improving photocatalytic efficiency is using suitable co-catalysts which can promote the separation of photogenerated electrons and holes. In this study, a typical MXene material, layered Ti3C2, was selected as a co-catalyst and acquired by selectively etching Al element from Ti3AlC2 using hydrogen fluoride (HF), and then the interlayer spacing of Ti3C2 was reduced through ultrasonic oscillation treatment. By subsequent hydrothermal reactions, the ZnO nanoparticles successfully grew on the surface of two kinds of layered Ti3C2 without and with ultrasonic oscillation treatment (Ti3C2 and Ti3C2-U), thus yielding two ZnO/Ti3C2 composite photocatalysts (ZTX and ZTUX samples), respectively. Compared with the pure ZnO, ZTX and ZTUX samples have significantly improved photocatalytic activity, which arises from the efficient separation of photogenerated electrons and holes depending on the appropriate Fermi level position of Ti3C2. Besides, the ZTUX photocatalysts on the whole exhibit higher photocatalytic activity compared with the ZTX photocatalysts, depending on narrower layer spacing of Ti3C2-U which facilitates transport of photogenerated electrons.
作者机构：
[Ma, Li; Ren, Yukai] School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China;[Cai, Cunkun] Beijing Institute of Precision Mechatronics and Controls, Beijing 100076, China;[Li, Lei] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430048, China;Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China;Author to whom correspondence should be addressed.
通讯机构：
[Hao Yan] S;School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China<&wdkj&>Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Beijing Jiaotong University, Ministry of Education, Beijing 100044, China<&wdkj&>Author to whom correspondence should be addressed.
期刊：
Journal of Physics: Conference Series,2022年2218(1) ISSN：1742-6588
通讯作者：
Tan, Z.
作者机构：
School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;Zhejiang Sany Equipment Limited Company, Zhejiang, 313002, China
通讯机构：
School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
期刊：
International Journal of Energy Research,2022年46(4):4770-4780 ISSN：0363-907X
通讯作者：
Chang, Huawei;Tu, Zhengkai
作者机构：
[Ma, Bangbang; Xiao, Chenguang; Pei, Houchang] Wuhan Polytech Univ, Sch Mech Engn, Wuhan, Peoples R China.;[Chang, HW; Tu, Zhengkai; Chang, Huawei] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China.
通讯机构：
[Chang, HW; Tu, ZK] H;Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Peoples R China.
关键词：
cathode moisture condensation;dead-ended PEMFC stack;hot spot distribution;temperature consistency;temperature distribution
摘要：
Thermal and water management are crucial factors affecting the performance of proton-exchange membrane fuel cells (PEMFCs). In this study, a semiconductor cooler was installed at the cathode outlet of a dead-ended fuel cell stack, to condense the water vapor in the stack, and subsequently realize efficient thermal and water management. The temperature distribution characteristics were experimentally studied using a self-built dead-ended PEMFC stack test platform. The effects of operating temperature, current density, and condensation temperature were analysed in detail. The results showed that the output performance of the dead-ended fuel cell stack could be efficiently improved by cathode moisture condensation. The temperature difference in the stack with cathode moisture condensation was much smaller than that without it. The output voltage of the stack could be increased by up to 6.02% with cathode moisture condensation, at an operating temperature of 70 degrees C; and the maximum temperature difference could be reduced by 92.8% upon applying the semiconductor cooler with a condensation temperature of 5 degrees C. Furthermore, the current density significantly affected the temperature distribution. Upon increasing the current density from 0.3 to 0.7 A/cm(2), the temperature difference increased from 1.37 degrees C to approximately 3 degrees C, due to the large amount of water generated by electrochemical reaction at high current density.
通讯机构：
[Xu Guan] C;[Fengshun Wu; Shijie Dong] S;College of Shipping and Ocean Engineering, Wuhan Institute of Shipbuilding Technology, Wuhan, China<&wdkj&>School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China<&wdkj&>School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China
