The exploration of efficient and durative bifunctional electrocatalysts for overall water splitting(OWS)is critical for hydrogen production in clean energy applications.Herein,a novel double-sandwiched architecture of...The exploration of efficient and durative bifunctional electrocatalysts for overall water splitting(OWS)is critical for hydrogen production in clean energy applications.Herein,a novel double-sandwiched architecture of reduced graphene oxide(rGO),cobalt silicate(CS),and cobalt–iron phosphides,denoted as rGO/CS/(Co,Fe)ₓPᵧ,is designed to enhance both the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in alkaline media.The formation of Co₂P and Fe₂P on rGO/CS not only protects the silicate from alkaline corrosion,but also generates dual-active centers that synergistically improve the conductivity and catalytic activity.Multiple interface coupling between rGO,CS,and(Co,Fe)ₓPᵧ triggers a built-in electric field,which significantly enhances charge separation,electron transport,and reaction kinetics.This built-in electric field lowers the energy barrier for HER by facilitating H–OH bond dissociation and accelerates the OER by promoting OH⁻adsorption.The rGO/CS/(Co,Fe)ₓPᵧ catalyst achieves overpotentials of 256 mV(OER)and 180 mV(HER)at 10 mA cm⁻²,surpassing most reported catalysts and rivaling commercial Pt/C and RuO₂.Furthermore,the rGO/CS/(Co,Fe)ₓPᵧ(+/−) demonstrates a low OWS voltage of 1.41 V.The current work provides a new approach to catalyst design through interface engineering and electric field optimization,offering a scalable solution for sustainable hydrogen production.展开更多
基金Fund of Hubei University of Science and Technology(BK202504)the Natural Science Foundation of Liaoning Province(2023-MS-115)for supporting this work+1 种基金the National Natural Science Foundation of China(22305028)the Dalian Minzu University Doctoral Program(120164)for supporting this work。
文摘The exploration of efficient and durative bifunctional electrocatalysts for overall water splitting(OWS)is critical for hydrogen production in clean energy applications.Herein,a novel double-sandwiched architecture of reduced graphene oxide(rGO),cobalt silicate(CS),and cobalt–iron phosphides,denoted as rGO/CS/(Co,Fe)ₓPᵧ,is designed to enhance both the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)in alkaline media.The formation of Co₂P and Fe₂P on rGO/CS not only protects the silicate from alkaline corrosion,but also generates dual-active centers that synergistically improve the conductivity and catalytic activity.Multiple interface coupling between rGO,CS,and(Co,Fe)ₓPᵧ triggers a built-in electric field,which significantly enhances charge separation,electron transport,and reaction kinetics.This built-in electric field lowers the energy barrier for HER by facilitating H–OH bond dissociation and accelerates the OER by promoting OH⁻adsorption.The rGO/CS/(Co,Fe)ₓPᵧ catalyst achieves overpotentials of 256 mV(OER)and 180 mV(HER)at 10 mA cm⁻²,surpassing most reported catalysts and rivaling commercial Pt/C and RuO₂.Furthermore,the rGO/CS/(Co,Fe)ₓPᵧ(+/−) demonstrates a low OWS voltage of 1.41 V.The current work provides a new approach to catalyst design through interface engineering and electric field optimization,offering a scalable solution for sustainable hydrogen production.
