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Multiscale structural optimization: Highly efficient hollow iron-doped metal sulfide heterostructures as bifunctional electrocatalysts for water splitting

Journal Article


Abstract


  • Hollow iron-doped Co���Mo sulfide (H���Fe���CoMoS) heterostructures with a highly efficient water-splitting catalytic ability were achieved by applying a multiscale optimization strategy. Morphological and compositional optimization on a macroscale achieved by assembling a bimetallic Co���Mo sulfide (CoMoS) heterostructure in a hollow-structured composite (H���CoMoS) gave the electrocatalyst an ability to conduct enhanced bifunctional activities for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Intrinsic electronic structure optimization on a microscale achieved by introducing a small amount of iron (Fe) into H���CoMoS (H���Fe���CoMoS) further improved its catalytic activity and stability. Electrochemical measurements revealed that this multiscale structural optimization promoted enhanced electrical conductivity and increased the number of electrochemical active sites on the H���Fe���CoMoS, leading to its remarkable electrocatalytic performance as a bifunctional catalyst for both HER and OER in alkaline media. The H���Fe���CoMoS showed overpotentials of 282 mV and 137 mV to achieve a current density of 10 mA cm���2 for OER and HER, respectively, which are comparable to the performance of the benchmark OER catalyst RuO2 and HER catalyst Pt/C.

Publication Date


  • 2020

Citation


  • Guo, Y., Zhou, X., Tang, J., Tanaka, S., Kaneti, Y. V., Na, J., . . . Sugahara, Y. (2020). Multiscale structural optimization: Highly efficient hollow iron-doped metal sulfide heterostructures as bifunctional electrocatalysts for water splitting. Nano Energy, 75. doi:10.1016/j.nanoen.2020.104913

Scopus Eid


  • 2-s2.0-85085659739

Volume


  • 75

Issue


Place Of Publication


Abstract


  • Hollow iron-doped Co���Mo sulfide (H���Fe���CoMoS) heterostructures with a highly efficient water-splitting catalytic ability were achieved by applying a multiscale optimization strategy. Morphological and compositional optimization on a macroscale achieved by assembling a bimetallic Co���Mo sulfide (CoMoS) heterostructure in a hollow-structured composite (H���CoMoS) gave the electrocatalyst an ability to conduct enhanced bifunctional activities for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Intrinsic electronic structure optimization on a microscale achieved by introducing a small amount of iron (Fe) into H���CoMoS (H���Fe���CoMoS) further improved its catalytic activity and stability. Electrochemical measurements revealed that this multiscale structural optimization promoted enhanced electrical conductivity and increased the number of electrochemical active sites on the H���Fe���CoMoS, leading to its remarkable electrocatalytic performance as a bifunctional catalyst for both HER and OER in alkaline media. The H���Fe���CoMoS showed overpotentials of 282 mV and 137 mV to achieve a current density of 10 mA cm���2 for OER and HER, respectively, which are comparable to the performance of the benchmark OER catalyst RuO2 and HER catalyst Pt/C.

Publication Date


  • 2020

Citation


  • Guo, Y., Zhou, X., Tang, J., Tanaka, S., Kaneti, Y. V., Na, J., . . . Sugahara, Y. (2020). Multiscale structural optimization: Highly efficient hollow iron-doped metal sulfide heterostructures as bifunctional electrocatalysts for water splitting. Nano Energy, 75. doi:10.1016/j.nanoen.2020.104913

Scopus Eid


  • 2-s2.0-85085659739

Volume


  • 75

Issue


Place Of Publication