Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy crisis.In this work,delafossite CuGaO_(2)(CGO)crystal was synthesized through hydrothermal routes with ...Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy crisis.In this work,delafossite CuGaO_(2)(CGO)crystal was synthesized through hydrothermal routes with Cu(NO_(3))_(2)·3H_(2)O and Ga(NO_(3))_(3)·xH_(2)O used as reactants.The addition of cetyltrimethylammonium bromide(CTAB)was found to play an important role in modifying the morphology of CuGaO_(2)(CGO-CTAB).With the addition of CTAB,the morphology of CGO-CTAB samples changed from irregular flake to typical hexagonal sheet microstructure,with an average size of 1-2μm and a thick-ness of around 100 nm.Furthermore,the electrocatalytic activity of CGO-CTAB crystals for oxygen evolution reaction(OER)was also studied and compared with that of CGO crystals.CGO-CTAB samples exhibited better activity than CGO.An overpotential of 391.5 mV was shown to be able to generate a current density of 10 mA/cm^(2).The as-prepared samples also demonstrate good stability for water oxidation and relatively fast OER kinetics with a Tafel slope of 56.4 mV/dec.This work highlights the significant role of modification of CTAB surfactants in preparing CGO related crystals,and the introduc-tion of CTAB was found to help to improve their electrocatalytic activity for OER.展开更多
基金The authors would like to express their sincere thanks for the financial support provided by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF018)the Fundamental Research Funds for the Central Universities(WUT:2020III012JL)X.Liu acknowledges the National Innovation and Entrepreneurship Training Program for College Students in WUT(No.S202110497022)。
文摘Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy crisis.In this work,delafossite CuGaO_(2)(CGO)crystal was synthesized through hydrothermal routes with Cu(NO_(3))_(2)·3H_(2)O and Ga(NO_(3))_(3)·xH_(2)O used as reactants.The addition of cetyltrimethylammonium bromide(CTAB)was found to play an important role in modifying the morphology of CuGaO_(2)(CGO-CTAB).With the addition of CTAB,the morphology of CGO-CTAB samples changed from irregular flake to typical hexagonal sheet microstructure,with an average size of 1-2μm and a thick-ness of around 100 nm.Furthermore,the electrocatalytic activity of CGO-CTAB crystals for oxygen evolution reaction(OER)was also studied and compared with that of CGO crystals.CGO-CTAB samples exhibited better activity than CGO.An overpotential of 391.5 mV was shown to be able to generate a current density of 10 mA/cm^(2).The as-prepared samples also demonstrate good stability for water oxidation and relatively fast OER kinetics with a Tafel slope of 56.4 mV/dec.This work highlights the significant role of modification of CTAB surfactants in preparing CGO related crystals,and the introduc-tion of CTAB was found to help to improve their electrocatalytic activity for OER.
