Heterojunction construction is a crucial strategy in developing efficient electrocatalysts.However,their structures are not well-suited for achieving high-performance dual functions due to the surface reorganization r...Heterojunction construction is a crucial strategy in developing efficient electrocatalysts.However,their structures are not well-suited for achieving high-performance dual functions due to the surface reorganization resulting from the separation and redeposition of heterometallic centers.A novel FeWO_(4)/Fe_(2)O_(3)catalyst was synthesized via pyrolysis to form a homometallic heterojunction,which exhibits remarkable electrocatalytic activity towards oxygen/hydrogen evolution reactions and overall water splitting.DFT calculations indicate that the FeWO_(4)/Fe_(2)O_(3)heterojunctions regulate the electronic states,accelerate charge transfer,and enhance electrocatalytic activity.As anticipated,the FeWO_(4)/Fe_(2)O_(3)heterostructure produced in 1 M KOH solution exhibits a low overpotential of 315 mV at 10 mA cm^(−2) for the OER and 38 mV for the HER.Furthermore,the FeWO_(4)/Fe_(2)O_(3)electrode can efficiently operate at a voltage of only 1.62 V in an electrolyzer to produce a current density of 10 mA cm^(−2) and maintain exceptional stability during prolonged operation at a constant voltage.展开更多
基金supported by the Program for Science&Technology Innovation Team in the Universities of Henan Province(No.21IRTSTHN004)the National Natural Science Foundation of China(No.21971031,21671114,and U1804131)the Tackle Key Problem of Science and Technology Project of Henan Province,China(No.202102210245 and 182102310897).
文摘Heterojunction construction is a crucial strategy in developing efficient electrocatalysts.However,their structures are not well-suited for achieving high-performance dual functions due to the surface reorganization resulting from the separation and redeposition of heterometallic centers.A novel FeWO_(4)/Fe_(2)O_(3)catalyst was synthesized via pyrolysis to form a homometallic heterojunction,which exhibits remarkable electrocatalytic activity towards oxygen/hydrogen evolution reactions and overall water splitting.DFT calculations indicate that the FeWO_(4)/Fe_(2)O_(3)heterojunctions regulate the electronic states,accelerate charge transfer,and enhance electrocatalytic activity.As anticipated,the FeWO_(4)/Fe_(2)O_(3)heterostructure produced in 1 M KOH solution exhibits a low overpotential of 315 mV at 10 mA cm^(−2) for the OER and 38 mV for the HER.Furthermore,the FeWO_(4)/Fe_(2)O_(3)electrode can efficiently operate at a voltage of only 1.62 V in an electrolyzer to produce a current density of 10 mA cm^(−2) and maintain exceptional stability during prolonged operation at a constant voltage.
