Ultra-small platinum nanoparticles segregated by nickle sites for efficient ORR and HER processes  

作　　者：Lvhan Liang Huihui jin Huang Zhou Bingshuai Liu Chenxi Hu Ding Chen Jiawei Zhu Zhe Wang Hai-Wen Li Suli Liu Daping He Shichun Mu 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,Hubei,China [2]Foshan Xianhu Laboratory of the Advanced Energy Science and Technology,Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,Guangdong,China [3]Hubei Engineering Research Center of RF-Microwave Technology and Application,Wuhan University of Technology,Wuhan 430070,Hubei,China [4]Platform of Inter/Transdisciplinary Energy Research,International Research Center for Hydrogen Energy,International Institute for Carbon-Neutral Energy Research,Yushu University,Fukuoka 819-0395,Japan [5]Key Laboratory of Advanced Functional Materials of Nanjing,Nanjing Xiaozhuang University,Nanjing 211171,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2022年第2期48-54,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22075223,51701146);the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)(2021-ZD-4)。

摘　　要：In the electrochemical process,Pt nanoparticles(NPs)in Pt-based catalysts usually agglomerate due to Oswald ripening or lack of restraint,ultimately resulting in reduction of the active sites and catalytic efficiency.How to uniformly disperse and firmly fix Pt NPs on carbon matrix with suitable particle size for catalysis is still a big challenge.Herein,to prevent the agglomeration and shedding of Pt NPs,Ni species is introduced and are evenly dispersed in the surface of carbon matrix in the form of Ni-N-C active sites(Ni ZIF-NC).The Ni sites can be used to anchor Pt NPs,and then effectively limit the further growth and agglomeration of Pt NPs during the reaction process.Compared with commercial Pt/C catalyst,Pt@Ni ZIF-NC,with ultralow Pt loading(7 wt%)and ideal particle size(2.3 nm),not only increases the active center,but also promotes the catalysis kinetics,greatly improving the ORR and HER catalytic activity.Under acidic conditions,its half-wave potential(0.902 V)is superior to commercial Pt/C(0.861 V),and the mass activity(0.38 A per mg Pt)at 0.9 V is 4.7 times that of Pt/C(0.08 A per mg Pt).Besides,it also shows outstanding HER performance.At 20 and 30 mV,its mass activity is even 2 and 6 times that of Pt/C,respectively.Whether it is under ORR or HER conditions,it still shows excellent durability.These undoubtedly indicate the realization of dual-functional catalysts with low-Pt and high-efficiency properties.

关 键 词：Oxygen reduction reaction Hydrogen evolution reaction Zeolitic imidazolate frameworks Nickle site Pt nanoparticles 

分 类 号：TQ426[化学工程] TB383.1[一般工业技术—材料科学与工程] TM911.4[电气工程—电力电子与电力传动]