The hydrogen evolution reaction(HER),oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)are the cornerstone reactions of renewable energy technologies,like electrochemical water splitting and metal-air ba...The hydrogen evolution reaction(HER),oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)are the cornerstone reactions of renewable energy technologies,like electrochemical water splitting and metal-air batteries.To promote these reactions,robust and efficient catalysts are highly desired.However,developing multifunctional electrocatalysts for integrating the HER,OER and ORR into one electrode still remains a huge challenge.Constructing intriguing nanostructures with multiple components and hierarchical interfaces could be an efficient method to develop multifunctional electrocatalysts.Herein,we report a strategy,derived from ZIF-67,to synthesize a novel core-double shell heterostructure Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 as a trifunctional pre-catalyst for the HER,OER and ORR.Firstly,a core-shell Co@Co_(9)S_(8)precursor was prepared through sulfurization and pyrolysis of ZIF-67.Then,a hydrothermal method was adopted to grow MoS_(2)on the Co@Co_(9)S_(8)precursor.Such a synthetic strategy endows the heterostructure with a strong interface effect that affects the electronic structure of materials and further boosts their electrocatalytic performance.The obtained Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 heterostructure shows outstanding electrochemical performance.The overpotentials required for the HER and OER in an alkaline solution are 173 mV and 340 mV at 10 mA cm^(-2),respectively.Moreover,Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 also exhibits superior ORR performance with a half-wave potential of 0.77 V.The strategy described here can be extended to a number of integrated multifunctional electrocatalysts for water splitting and metal-air batteries.展开更多
基金supported by the NSFC(No.21671077,21771075,21571176,and 21871106).
文摘The hydrogen evolution reaction(HER),oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)are the cornerstone reactions of renewable energy technologies,like electrochemical water splitting and metal-air batteries.To promote these reactions,robust and efficient catalysts are highly desired.However,developing multifunctional electrocatalysts for integrating the HER,OER and ORR into one electrode still remains a huge challenge.Constructing intriguing nanostructures with multiple components and hierarchical interfaces could be an efficient method to develop multifunctional electrocatalysts.Herein,we report a strategy,derived from ZIF-67,to synthesize a novel core-double shell heterostructure Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 as a trifunctional pre-catalyst for the HER,OER and ORR.Firstly,a core-shell Co@Co_(9)S_(8)precursor was prepared through sulfurization and pyrolysis of ZIF-67.Then,a hydrothermal method was adopted to grow MoS_(2)on the Co@Co_(9)S_(8)precursor.Such a synthetic strategy endows the heterostructure with a strong interface effect that affects the electronic structure of materials and further boosts their electrocatalytic performance.The obtained Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 heterostructure shows outstanding electrochemical performance.The overpotentials required for the HER and OER in an alkaline solution are 173 mV and 340 mV at 10 mA cm^(-2),respectively.Moreover,Co_(9)S_(8)@Co_(9)S_(8)@MoS_(2)-0.5 also exhibits superior ORR performance with a half-wave potential of 0.77 V.The strategy described here can be extended to a number of integrated multifunctional electrocatalysts for water splitting and metal-air batteries.
