Porous heterostructure of graphene/hexagonal boron nitride as an efficient electrocatalyst for hydrogen peroxide generation  

作　　者：Mengmeng Fan Zeming Wang Yuying Zhao Qixin Yuan Jian Cui Jithu Raj Kang Sun Ao Wang Jingjie Wu Hao Sun Bei Li Liang Wang Jianchun Jiang 

机构地区：[1]Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,International Innovation Center for Forest Chemicals and Materials,College of Chemical Engineering,Nanjing Forestry University,Nanjing,China [2]Key Lab of Biomass Energy and Material,Jiangsu Province,Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Institute of Chemical Industry of Forest Products,Chinese Academy of Forestry,Nanjing,China [3]School of Environmental and Chemical Engineering,Institute of Nanochemistry and Nanobiology,Shanghai University,Shanghai,China [4]Chemicobiology and Functional Materials Institute,Nanjing University of Science and Technology,Nanjing,China [5]Department of Chemical and Environmental Engineering,University of Cincinnati,Cincinnati,Ohio,USA

出　　处：《Carbon Energy》2023年第5期138-151,共14页碳能源（英文）

基　　金：supported by the“National Natural Science Foundation of China (Nos.51902162,21901154)”;the FoundationResearch Project of Jiangsu Province (BK20221338);Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,International Innovation Center for Forest Chemicals and Materials,Nanjing Forestry University,merit-based funding for Nanjing innovation and technology projects,Shanghai Pujiang Program (21PJD022);the Foundation of Jiangsu Key Lab of Biomass Energy and Material (JSBEM-S-202101).

摘　　要：Compared with the traditional heteroatom doping,employing heterostructure is a new modulating approach for carbon-based electrocatalysts.Herein,a facile ball milling-assisted route is proposed to synthesize porous carbon materials composed of abundant graphene/hexagonal boron nitride(G/h-BN)heterostructures.Metal Ni powder and nanoscale h-BN sheets are used as a catalytic substrate/hard template and“nucleation seed”for the formation of the heterostructure,respectively.As-prepared G/h-BN heterostructures exhibit enhanced electrocatalytic activity toward H_(2)O_(2) generation with 86%-95%selectivity at the range of 0.45-0.75 V versus reversible hydrogen electrode(RHE)and a positive onset potential of 0.79 versus RHE(defined at a ring current density of 0.3 mA cm^(-2))in the alkaline solution.In a flow cell,G/h-BN heterostructured electrocatalyst has a H_(2)O_(2) production rate of up to 762 mmol g_(catalyst)^(-1) h^(-1) and Faradaic efficiency of over 75%during 12 h testing,superior to the reported carbon-based electrocatalysts.The density functional theory simulation suggests that the B atoms at the interface of the G/h-BN heterostructure are the key active sites.This research provides a new route to activate carbon catalysts toward highly active and selective O_(2)-to-H_(2)O_(2) conversion.

关 键 词：efficient electrocatalyst GRAPHENE H_(2)O_(2)generation hexagonal boron nitride porous heterostructure 

分 类 号：TQ426[化学工程] TQ127.11