摘要
High-temperature proton exchange membrane fuel cells(HT-PEMFCs)bring new opportunities for portable power generation due to their outstanding advantages such as high tolerance to fuel/air impurities and simplified heat/water management.However,carbon-supported nanostructured Pt-based catalysts running at temperatures over 150℃are challenged by the severe aggregation and carbon corrosion,thus leading to poor durability.Herein,we demonstrate that dendritic Pt-Ni nanoparticles supported on fluorinated carbon black(white carbon black)could significantly enhance the performance and durability of HT-PEMFCs as the cathode catalysts running at 160℃due to the strong interaction of the F and Ni atoms to form a Ni_(x)F_(y) interface on Pt-Ni nanoparticles.With the formation of a stable Ni_(x)F_(y) interface,this integrated HT-PEMFC reached peak power densities of 906 mW cm^(−2) and demonstrated excellent durability at 160℃ under anhydrous H_(2)/O_(2) conditions.This mitigation strategy was applied to Pt-alloy/C electrocatalysts and resulted in the elimination of Pt dissolution in practical fuel cells.
高温质子交换膜燃料电池(HT-PEMFCs)以其杂质耐受性高、系统简化等突出优势为燃料电池的发展带来了新机遇.目前广泛使用的铂碳催化剂存在严重的颗粒团聚、载体腐蚀等耐久性较差问题.本文采用氟化碳黑(白碳黑)负载的枝状Pt-Ni纳米颗粒作为HT-PEMFCs阴极催化剂,由于Ni、F强相互作用并在Pt-Ni合金表面形成了Ni_(x)F_(y)界面,可显著提升器件性能和耐受性,在160℃、干燥H_(2)/O_(2)条件下峰功率密度可达906 mW cm^(−2).本文成功利用Ni_(x)F_(y)界面提升合金催化剂的活性和稳定性,对于HT-PEMFCs催化剂的设计具有指导意义.
作者
Peng Long
Shiqian Du
Qie Liu
Li Tao
Cong Peng
Tehua Wang
Kaizhi Gu
Chao Xie
Yiqiong Zhang
Ru Chen
Shanfu Lu
Yi Cheng
Wei Feng
Shuangyin Wang
龙鹏;杜石谦;刘切;陶李;彭聪;王特华;顾开智;谢超;张怡琼;陈如;卢善富;程义;封伟;王双印(State Key Laboratory of Chem/Bio-Sensing and Chemometrics,Provincial Hunan Key Laboratory for Graphene Materials and Devices,Advanced Catalytic Engineering Research Center of the Ministry of Education,College of Chemistry and Chemical Engineering,Hunan University,Changsha,410082,China;School of Materials Science and Engineering,Tianjin University,Tianjin,300072,China;College of Materials Science and Engineering,Changsha University of Science&Technology,Changsha,410083,China;Beijing Key Laboratory of Bioinspired Energy Materials and Devices,School of Space and Environment,Beihang University,Beijing,100191,China)
基金
supported by the National Key R&D Program of China(2020YFA0710000)
the National Natural Science Foundation of China(21825201,U19A2017)
the Provincial Natural Science Foundation of Hunan(2019GK2031,2016TP1009,2020JJ5045)
China Postdoctoral Science Foundation(2020M682541)
the Science and Technology Innovation Program of Hunan Province,China(2020RC2020)
Changsha Municipal Natural Science Foundation(kq2007009)。
