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
A low-cost carrier is developed and the size of Ru nanoparticles is reduced to enhance the performance of Ru catalysts used in the hydrogen evolution reaction(HER).In this study,a nanorod array catalyst was synthesize...A low-cost carrier is developed and the size of Ru nanoparticles is reduced to enhance the performance of Ru catalysts used in the hydrogen evolution reaction(HER).In this study,a nanorod array catalyst was synthesized by combining ruthenium(Ru)with amorphous cobalt-molybdenum-phosphorus(CoMoP/NF).Numerous studies have shown that amorphous structures provide structural flexibility and rich defects for the HER and aid in the uniform loading of Ru nanoparticles.Ru nanoparticles that are uniformly distributed offer a high density of active sites,increasing the electrochemical surface area.Ru-CoMoP/NF exhibited exceptional HER performance in alkaline and alkaline seawater solutions(122 mV@100 mA cm^(−2) and 127 mV@100 mA cm^(−2)).Meanwhile,the catalyst can be stably exported for 50 h at 100 mA cm^(−2).Additionally,the unique structure and isotropic characteristics of the amorphous phase improve the corrosion resistance and make the catalyst maintain good activity in seawater.This study demonstrates the advantages of an amorphous phosphide,enriches the types of supported Ru-based nanomaterials,and provides insights into the development of highly efficient catalysts.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.
基金supported by the National Natural Science Foundation of China(52174283,52274308 and U22B20144)the Shandong Provincial Natural Science Foundation(ZR2023LFG005)+1 种基金the China National Petroleum Corporation Basic Forward-looking Science and Technology Project(Research on key materials and technologies for electrolytic hydrogen production from produced water and seawater 2023ZZ1203)the Fundamental Research Funds for the Central Universities(24CX03012A).
文摘A low-cost carrier is developed and the size of Ru nanoparticles is reduced to enhance the performance of Ru catalysts used in the hydrogen evolution reaction(HER).In this study,a nanorod array catalyst was synthesized by combining ruthenium(Ru)with amorphous cobalt-molybdenum-phosphorus(CoMoP/NF).Numerous studies have shown that amorphous structures provide structural flexibility and rich defects for the HER and aid in the uniform loading of Ru nanoparticles.Ru nanoparticles that are uniformly distributed offer a high density of active sites,increasing the electrochemical surface area.Ru-CoMoP/NF exhibited exceptional HER performance in alkaline and alkaline seawater solutions(122 mV@100 mA cm^(−2) and 127 mV@100 mA cm^(−2)).Meanwhile,the catalyst can be stably exported for 50 h at 100 mA cm^(−2).Additionally,the unique structure and isotropic characteristics of the amorphous phase improve the corrosion resistance and make the catalyst maintain good activity in seawater.This study demonstrates the advantages of an amorphous phosphide,enriches the types of supported Ru-based nanomaterials,and provides insights into the development of highly efficient catalysts.
