The development of inexpensive and efficient Pt-free electrocatalysts for the hydrogen evolution reaction(HER)is greatly crucial for water electrolysis.Tungsten carbide(WC)exhibiting a Pt-like electronic structure rep...The development of inexpensive and efficient Pt-free electrocatalysts for the hydrogen evolution reaction(HER)is greatly crucial for water electrolysis.Tungsten carbide(WC)exhibiting a Pt-like electronic structure represents an attractive alternative,although its overall performance is limited by the strong W-H bond that impedes hydrogen desorption.Here,we employed an in-situ interface engineering strategy to construct high-performance and cost effective electrocatalysts comprising WC/tungsten phosphide(WP)heterostructures that were anchored on N,P-codoped carbon(WC/WP@NPC)via a one-step pyrolysis of a melamine polyphosphate/WO_(3) hybrid in an inert atmosphere.Owing to the crystal structure compatibility and electron-rich property of WP,it optimizes the electronic structure and hydrogen adsorption configuration of WC,thus significantly weakening the W-H bond with a thermoneutral Gibbs free energy of hydrogen adsorption(ΔG_(H^(*)))of−0.05 eV.Additionally,NPC ensures fast electron transport and structural stability of the WC/WP@NPC ternary architecture.These synergistically lead to outstanding HER performances of the catalyst in acidic and alkaline media.Our finding offers a new strategy for designing Pt-alternative electrocatalysts with outstanding electrochemical performances for high-efficiency water splitting and other applications.展开更多
基金financially supported by the National Natural Science Foundation of China(51902261,61935017)the Joint Research Funds of the Department of Science&Technology of Shaanxi Province and NPU(2020GXLH-Z-024)+3 种基金the Natural Science Basic Research Program of Shaanxi Province(2021JQ-096,2021JQ-107)the Natural Science Foundation of Ningbo(202003N4053,202003N4046)the Fundamental Research Funds for the Central Universities(31020180QD094,31020180QD116,G2021KY05106)the Start-up Funding from NPU。
文摘The development of inexpensive and efficient Pt-free electrocatalysts for the hydrogen evolution reaction(HER)is greatly crucial for water electrolysis.Tungsten carbide(WC)exhibiting a Pt-like electronic structure represents an attractive alternative,although its overall performance is limited by the strong W-H bond that impedes hydrogen desorption.Here,we employed an in-situ interface engineering strategy to construct high-performance and cost effective electrocatalysts comprising WC/tungsten phosphide(WP)heterostructures that were anchored on N,P-codoped carbon(WC/WP@NPC)via a one-step pyrolysis of a melamine polyphosphate/WO_(3) hybrid in an inert atmosphere.Owing to the crystal structure compatibility and electron-rich property of WP,it optimizes the electronic structure and hydrogen adsorption configuration of WC,thus significantly weakening the W-H bond with a thermoneutral Gibbs free energy of hydrogen adsorption(ΔG_(H^(*)))of−0.05 eV.Additionally,NPC ensures fast electron transport and structural stability of the WC/WP@NPC ternary architecture.These synergistically lead to outstanding HER performances of the catalyst in acidic and alkaline media.Our finding offers a new strategy for designing Pt-alternative electrocatalysts with outstanding electrochemical performances for high-efficiency water splitting and other applications.
