Exploring highly efficient,economical and environment friendly electrocatalysts for the hydrogen and oxygen evolution reactions(HER and OER)is necessary but challenging for economical water splitting.Herein,FeS_(2) na...Exploring highly efficient,economical and environment friendly electrocatalysts for the hydrogen and oxygen evolution reactions(HER and OER)is necessary but challenging for economical water splitting.Herein,FeS_(2) nanoparticles were anchored on the surface of MXene through a simple adsorption-growth route(FeS_(2)@MXene).By virtue of the large active surface area of FeS_(2) and its robust interfacial interaction with conductive and hydrophilic MXene nanosheets,the obtained FeS_(2)@MXene composite can accelerate the transfer of mass/charge and facilitate contact between water molecules and reactive sites of FeS_(2).Specifically,MXene as a support material can not only alter the electrophilicity of the active centers of FeS_(2) through modulating the electron density but also prevent the aggregation of FeS_(2),thereby promoting activity and stability.The optimized FeS_(2)@MXene delivers a 10 mA cm-2 current density at overpotentials of 87 and 240 mV in alkaline solution for the HER and OER,respectively,which is comparable with reported transition metal sulfide(TMS)based catalysts.More importantly,in situ Raman spectroscopy reveals that the FeOOH generated during the OER process as a actual active species enhances the intrinsic activity of the catalyst.This work paves a new way for the interface engineering of TMS-based electrocatalysts towards water splitting.展开更多
基金supported by the National Natural Science Foundation of China[51871119,51901100 and 22075141]the High-Level Entrepreneurial and Innovative Talents Program of Jiangsu Province,the Six Talent Peak Project of Jiangsu Province[2018-XCL-033]+1 种基金the China Postdoctoral Science Foundation[2018M640481 and 2019T120426]the Jiangsu Postdoctoral Research Fund[2019K003].
文摘Exploring highly efficient,economical and environment friendly electrocatalysts for the hydrogen and oxygen evolution reactions(HER and OER)is necessary but challenging for economical water splitting.Herein,FeS_(2) nanoparticles were anchored on the surface of MXene through a simple adsorption-growth route(FeS_(2)@MXene).By virtue of the large active surface area of FeS_(2) and its robust interfacial interaction with conductive and hydrophilic MXene nanosheets,the obtained FeS_(2)@MXene composite can accelerate the transfer of mass/charge and facilitate contact between water molecules and reactive sites of FeS_(2).Specifically,MXene as a support material can not only alter the electrophilicity of the active centers of FeS_(2) through modulating the electron density but also prevent the aggregation of FeS_(2),thereby promoting activity and stability.The optimized FeS_(2)@MXene delivers a 10 mA cm-2 current density at overpotentials of 87 and 240 mV in alkaline solution for the HER and OER,respectively,which is comparable with reported transition metal sulfide(TMS)based catalysts.More importantly,in situ Raman spectroscopy reveals that the FeOOH generated during the OER process as a actual active species enhances the intrinsic activity of the catalyst.This work paves a new way for the interface engineering of TMS-based electrocatalysts towards water splitting.
