It is essential to design and synthesize non-noble metal-based electrocatalysts for the highly efficient hydrogen evolution reaction(HER).In this study,we have successfully prepared a self-supporting phosphide heteros...It is essential to design and synthesize non-noble metal-based electrocatalysts for the highly efficient hydrogen evolution reaction(HER).In this study,we have successfully prepared a self-supporting phosphide heterostructured electrocatalyst,where CoMoP_(2) nanosheets are well distributed on the surface of Co_(2)P hollow nanobricks on Ni foam.The testing results demonstrated that the as-prepared Co_(2)P/CoMoP_(2) exhibited excellent HER performance with an overpotential of 36 mV and 43 mV(at 10 mA cm^(-2))in alkaline water and seawater electrolyte,respectively.Meanwhile,it also showed good oxygen evolution reaction(OER)activity at 10 mA cm^(-2) with an overpotential of 254 mV in alkaline water and 268 mV in alkaline seawater electrolyte,respectively.Theoretical research studies have verified that the activation energy barrier of H_(2)O on the surface of CoMoP_(2) was 0.63 eV,while that on the surface of Co_(2)P was 0.73 eV,indicating that CoMoP_(2) can promote the Volmer step.Also,the electronic redistribution at the interface enabled the Co_(2)P/CoMoP_(2) heterojunction to achieve the ideal Gibbs free energy of hydrogen adsorption(0.16 eV).Interface engineering provides a simple and efficient approach for designing highly efficient Co_(2)P-based electrocatalysts.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.:22002146)Taishan Scholars Foundation of Shandong Province(no.:tsqn201909058).
文摘It is essential to design and synthesize non-noble metal-based electrocatalysts for the highly efficient hydrogen evolution reaction(HER).In this study,we have successfully prepared a self-supporting phosphide heterostructured electrocatalyst,where CoMoP_(2) nanosheets are well distributed on the surface of Co_(2)P hollow nanobricks on Ni foam.The testing results demonstrated that the as-prepared Co_(2)P/CoMoP_(2) exhibited excellent HER performance with an overpotential of 36 mV and 43 mV(at 10 mA cm^(-2))in alkaline water and seawater electrolyte,respectively.Meanwhile,it also showed good oxygen evolution reaction(OER)activity at 10 mA cm^(-2) with an overpotential of 254 mV in alkaline water and 268 mV in alkaline seawater electrolyte,respectively.Theoretical research studies have verified that the activation energy barrier of H_(2)O on the surface of CoMoP_(2) was 0.63 eV,while that on the surface of Co_(2)P was 0.73 eV,indicating that CoMoP_(2) can promote the Volmer step.Also,the electronic redistribution at the interface enabled the Co_(2)P/CoMoP_(2) heterojunction to achieve the ideal Gibbs free energy of hydrogen adsorption(0.16 eV).Interface engineering provides a simple and efficient approach for designing highly efficient Co_(2)P-based electrocatalysts.
