Small-sized Ni-Co/Mo_(2)C/Co_(6)Mo_(6)C_(2)@C for efficient alkaline and acidic hydrogen evolution reaction by an anchoring calcination strategy  

作　　者：Jianxia Gu Ying Zhu Haiyan Zheng Chunyi Sun Zhongmin Su 

机构地区：[1]Department of Chemistry,Xinzhou Normal University,Xinzhou 034000,China [2]School of Chemistry,Northeast Normal University,Changchun 130024,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第5期95-103,共9页化学科学与工程前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.21971032);the Youth Science Research Project of Shanxi Province(Grant No.202103021223362);the Science and technology innovation project of higher education in Shanxi Province(Grant No.2021L450);the Foundation of Xinzhou Teachers University,China(Grant No.2021KY07);the State Key Laboratory of Safety and Control for Chemicals[10010104-19-ZC0613-0180].

摘　　要：A novel,cheap and highly efficient Ni-Co/Mo_(2)C/Co_(6)Mo_(6)C_(2)@C nanocomposite has been successfully constructed through simple one-step carbonization method in a nitrogen atmosphere.Polyethyleneimine in the precursor can effectively anchor molybdenum-based Keggin-type polyoxometallate and NiCo-layered double hydroxide through electrostatic and coordination interactions,which avoids the aggregation of catalyst particles during the pyrolysis process.After optimization,the obtained Ni-Co/Mo_(2)C/Co_(6)Mo_(6)C_(2)@C possesses small size(3-8 nm),large specific surface area and hierarchical pore structure.More importantly,Ni-Co/Mo_(2)C/Co_(6)Mo_(6)C_(2)@C presents remarkable hydrogen evolution reaction activity with low overpotentials in 0.5 mol·L^(-1)H_(2)SO_(4)(102.3 mV)and 1 mol·L^(-1)KOH(95 mV)to afford the current density of 10 mA·cm^(-2),as well as small Tafel slopes of 82.49 and 99.92 mV·dec^(-1),respectively.Simultaneously,this catalyst also shows outstanding stability for 12 h without a significant change in current density.The excellent catalytic performance of Ni-Co/Mo_(2)C/Co_(6)Mo_(6)C_(2)@C can put down to the synergistic effect between multiple components and the small size of the catalyst.This work provides unique insights into the preparation of efficient transition metal-based catalysts for HER.

关 键 词：POLYOXOMETALLATES layered double hydroxide transition metal-based electrocatalysts hydrogen evolution reaction 

分 类 号：O64[理学—物理化学]