文献类型：期刊文献

英文题名：Stable and active low-Pt electrocatalysts using defective carbon support assembled from graphene quantum dots

作者：Cheng, Junjie[1];Zhao, Zongtao[2,3];Zhang, Bin[4];Xu, Jiansheng[2,3];Lin, Chao[5];Li, Xiaopeng[2,3];Gu, Xiongyi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China;[3]Donghua Univ, Coll Mat Sci & Engn, Shanghai 201620, Peoples R China;[4]Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China;[5]Hanyang Univ, Dept Mat Sci & Chem Engn, Ansan 15588, South Korea

年份：2022

卷号：900

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20220211443915);WOS:【SCI-EXPANDED(收录号:WOS:000749697800004)】；

基金：The authors thank the National Natural Science Foundation of China (No. 21972163), the Fundamental Research Funds for the Central Universities, the DHU Distinguished Young Professor Program, the Development Fund for Shanghai Talents, and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.

语种：英文

外文关键词：Defective carbon support; Graphene quantum dots; Low-Pt electrocatalysts; Hydrogen evolution reaction

摘要：Reducing precious metal loading is of paramount importance in electrocatalysis. Here, we propose an efficient strategy to synthesize low-Pt electrocatalysts (3.9 wt%) with hydrogen evolution reaction (HER) performance comparable to that of a state-of-the-art 20% Pt/C electrocatalyst. Graphene quantum dots (GQDs) were used as building blocks for carbon support. Cobalt catalyzed the GQDs assembly into porous carbon nanosheets with plenty of defects and high N doping. Pt was deposited on the support via in-situ electrochemical cycling. The combination of low Pt nanoparticles loading and defective carbon remarkably enhanced the HER activity in both acid (overpotential = 84 mV at 100 mA cm(-2), Tafel slope of 45 mV dec(-1)) and alkaline electrolytes (overpotential = 300 mV at 100 mA(-2), Tafel slope of 152 mV dec(-1)) while showing excellent stability and durability for 45 h. (C) 2021 Elsevier B.V. All rights reserved.