2D materials are regarded as promising electrocatalysts for water splitting because of their advances in providing ample active sites and improving electrochemical reaction kinetics.2D MoSe_(2)has a greater intrinsic ...2D materials are regarded as promising electrocatalysts for water splitting because of their advances in providing ample active sites and improving electrochemical reaction kinetics.2D MoSe_(2)has a greater intrinsic electrical conductivity and lower Gibbs free energy for reactant adsorption.However,there is still room for improvement in the electrocatalytic performance of MoSe_(2)for high-performance electrochemical water splitting devices.Herein,the in situ preparation of heterostructure made of covalently bonded MoSe_(2)and rGO is reported.The obtained electrocatalyst contains the aggregated 3D structured MoSe_(2)over rGO,which is covalently bonded together with more edge sites.The active edge sites of MoSe_(2)/rGO are dynamically involved in the electrocatalytic activity while facilitating electron transfer.Hence,the MoSe_(2)/rGO heterostructure requires a low cell voltage of 1.64 V to reach 100 mA cm^(−2)in water splitting with high reaction kinetics.The aggregated MoSe_(2)over rGO with more edge sites exposed by the 3D structure of MoSe_(2)and the interfacial covalent bond in between them provides a favorable electronic structure for the HER and OER with low overpotentials and high current densities and enhances the stability of the electrocatalyst.This work presents an attractive and cost-effective electrocatalyst suitable for industrial-scale hydrogen fuel production.展开更多
基金National Research Foundation of Korea,Grant/Award Number:RS-2023-00248447Ministry of Science and the Korean Government(MSIT),Republic of Korea,Grant/Award Number:RS-2023-00248447+3 种基金The Korea Institute of Energy Technology Evaluation and Planning(KETEP),Grant/Award Numbers:RS-2023-00242227,20224000000320Ministry of Trade,Industry,and Energy,Republic of Korea,Grant/Award Numbers:RS-2023-00242227,20224000000320Korea Electric Power Corporation(KEPCO),Grant/Award Number:R23XO04KENTECH Research Grant,Grant/Award Number:KRG2022-01-016。
文摘2D materials are regarded as promising electrocatalysts for water splitting because of their advances in providing ample active sites and improving electrochemical reaction kinetics.2D MoSe_(2)has a greater intrinsic electrical conductivity and lower Gibbs free energy for reactant adsorption.However,there is still room for improvement in the electrocatalytic performance of MoSe_(2)for high-performance electrochemical water splitting devices.Herein,the in situ preparation of heterostructure made of covalently bonded MoSe_(2)and rGO is reported.The obtained electrocatalyst contains the aggregated 3D structured MoSe_(2)over rGO,which is covalently bonded together with more edge sites.The active edge sites of MoSe_(2)/rGO are dynamically involved in the electrocatalytic activity while facilitating electron transfer.Hence,the MoSe_(2)/rGO heterostructure requires a low cell voltage of 1.64 V to reach 100 mA cm^(−2)in water splitting with high reaction kinetics.The aggregated MoSe_(2)over rGO with more edge sites exposed by the 3D structure of MoSe_(2)and the interfacial covalent bond in between them provides a favorable electronic structure for the HER and OER with low overpotentials and high current densities and enhances the stability of the electrocatalyst.This work presents an attractive and cost-effective electrocatalyst suitable for industrial-scale hydrogen fuel production.
