缺陷g-C_(3)N_(4)优化催化层的磷酸分布以提高高温质子膜燃料电池的性能  

Defective g-C_(3)N_(4) optimizes phosphate distribution in the catalytic layer and boosts the performance of high-temperature proton exchange membrane fuel cells

作　　者：张东材 孔志杰 黄根 杜石谦 林嘉祺 王燕勇 余刚 陶李 王双印 Dongcai Zhang;Zhijie Kong;Gen Huang;Shiqian Du;Jiaqi Lin;Yanyong Wang;Gang Yu;Li Tao;Shuangyin Wang(State Key Laboratory of Chem/Bio-Sensing and Chemometrics,Provincial Hunan Key Laboratory for Graphene Materials and Devices,College of Chemistry and Chemical Engineering,the National Supercomputer Centers in Changsha,Hunan University,Changsha 410082,China;Shenzhen Research Institute,Hunan University,Shenzhen 518000,China)

机构地区：[1]State Key Laboratory of Chem/Bio-Sensing and Chemometrics,Provincial Hunan Key Laboratory for Graphene Materials and Devices,College of Chemistry and Chemical Engineering,the National Supercomputer Centers in Changsha,Hunan University,Changsha 410082,China [2]Shenzhen Research Institute,Hunan University,Shenzhen 518000,China

出　　处：《Science China Materials》2023年第9期3468-3474,共7页中国科学（材料科学（英文版）

基　　金：financially supported by the National Key R&D Program of China (2021YFA1500900);the National Natural Science Foundation of China (22102053, 21825201 and U19A2017);the Provincial Natural Science Foundation of Hunan (2016TP1009, 2020JJ5045 and 2022JJ10006);the Science and Technology Innovation Program of Hunan Province (2022RC1036);the Major Program of the Natural Science Foundation of Hunan Province (2021JC0006);Hunan Graduate Education Innovation Project and Professional Ability Improvement Project (CX20210400);the Basic and Applied Basic Research Foundation of Guangdong Province-Regional joint fund project (2021B1515120024);Shenzhen Science and Technology Programs (JCYJ20200109110416441)。

摘　　要：磷酸作为质子传导介质对于高温质子膜燃料电池是至关重要的但调节磷酸分布来减少电催化剂中毒及保持高反应性的稳定性仍面临挑战.在本工作中,缺陷g-C_(3)N_(4)被分散到Pt/C催化层中促进磷酸的分布来提高催化剂的本征活性表达.由于缺陷g-C_(3)N_(4)修饰,低铂负载量在阳极(0.20 mgPtcm^(-2))和阴极(0.40 mgPtcm^(-2))条件下,高温质子膜燃料电池呈现一个高的峰功率672 mW cm^(-2)和高反应性(高于620 mW cm^(-2)),且具有3500个加速循环的优越稳定性,该性能优于目前报道的结果.本工作首次揭示了缺陷g-C_(3)N_(4)与磷酸的酸碱相互作用可调节催化层的磷酸分布,从而提高催化剂的本征活性表达和利用率.Phosphoric acid(PA)is a vital proton-conducting medium for high-temperature proton exchange membrane fuel cells(HT-PEMFCs);however,regulating its distribution to decrease poisoning on the electrocatalysts and maintain elevated reactivity durability remains a significant challenge.In this work,defective g-C_(3)N_(4)(D-C_(3)N_(4))was incorporated into Pt/C catalyst layers to promote PA distribution for enhancing the intrinsic reactivity expression of catalysts.Following decoration of D-C_(3)N_(4),HT-PEMFCs with low Pt loading in both the anode(0.20 mgPt cm^(-2))and the cathode(0.40 mgPt cm^(-2))exhibited a high peak power density of 672 mW cm^(-2) and excellent high reactivity durability(above 620 mW cm^(-2))after accelerated 3500 cycles,which is far superior to previously published results.This work first reveals that the acid/base interaction of D-C_(3)N_(4) with PA modulates PA distribution in the catalytic layer,thereby enhancing the intrinsic reactivity expression and utilization efficiency of catalysts in HT-PEMFCs.

关 键 词：质子膜燃料电池 催化层 PT/C 催化剂中毒 质子传导 活性表达 加速循环 面临挑战 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]