The rational design of high-performance bifunctional electrocatalysts for overall water splitting(OWS)is the key to popularize hydrogen production technology.The active metal oxyhydroxide(MOOH)formed after surface sel...The rational design of high-performance bifunctional electrocatalysts for overall water splitting(OWS)is the key to popularize hydrogen production technology.The active metal oxyhydroxide(MOOH)formed after surface self-reconfiguration of transition metal sulfide(TMS)electrocatalyst is often regarded as the"actual catalyst"in oxygen evolution reaction(OER).Herein,an Fe doped Co S2/Mo S2hollow TMS polyhedron(Fe-Co S2/Mo S2)with rich Mott-Schottky heterojunction is reported and directly utilized as an OWS electrocatalyst.The spontaneous built-in electric field(BEF)at the heterogeneous interface regulates the electronic structure and D-band center of the catalyst.More importantly,the“TMS-MOOH”core-shell structure obtained in the KOH electrolyte shows enhanced OER properties.And the introduction of Fe ions activates the inert basal plane of Mo S2,which greatly steps up the performance of HER.Hence,the preferable Fe-CoS_(2)/MoS_(2)–400 presents superior OER activity(η_(10)=178 m V,η_(100)=375 m V),HER activity(η_(10)=92 m V)and ultra-high stability for 50 h.This work has deeply explored the catalytic mechanism of TMS and provided a new idea for the construction of efficient bifunctional catalysts.展开更多
基金supported by National Natural Science Foundation of China(Nos.52073199 and 52274304)。
文摘The rational design of high-performance bifunctional electrocatalysts for overall water splitting(OWS)is the key to popularize hydrogen production technology.The active metal oxyhydroxide(MOOH)formed after surface self-reconfiguration of transition metal sulfide(TMS)electrocatalyst is often regarded as the"actual catalyst"in oxygen evolution reaction(OER).Herein,an Fe doped Co S2/Mo S2hollow TMS polyhedron(Fe-Co S2/Mo S2)with rich Mott-Schottky heterojunction is reported and directly utilized as an OWS electrocatalyst.The spontaneous built-in electric field(BEF)at the heterogeneous interface regulates the electronic structure and D-band center of the catalyst.More importantly,the“TMS-MOOH”core-shell structure obtained in the KOH electrolyte shows enhanced OER properties.And the introduction of Fe ions activates the inert basal plane of Mo S2,which greatly steps up the performance of HER.Hence,the preferable Fe-CoS_(2)/MoS_(2)–400 presents superior OER activity(η_(10)=178 m V,η_(100)=375 m V),HER activity(η_(10)=92 m V)and ultra-high stability for 50 h.This work has deeply explored the catalytic mechanism of TMS and provided a new idea for the construction of efficient bifunctional catalysts.
