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A multi-step induced strategy to fabricate core-shell pt-ni alloy as symmetric electrocatalysts for overall water splitting

引用

Nano Research 2022年第2期15卷 965-971页

作者： Wenjuan Xu Jinfa Chang Yinggang Cheng Hongqi Liu Jifan Li Yongjian Ai Zenan Hu Xinyue Zhang Yiming Wang Qionglin Liang Yang Yang Hongbin Sun Department of Chemistry Northeastern UniversityShenyang 110819China NanoScience Technology Center Department of Materials Science and EngineeringUniversity of Central FloridaOrlandoFL 32826USA Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryCenter for Synthetic and Systems BiologyTsinghua UniversityBeijing 100084China

Devising an electrocatalyst with brilliant efficiency and satisfactory durability for hydrogen production is of considerable demand,especially for large-scale ***,we adopt a multi-step consequential induced strategy to construct a bifunctional electrocatalyst for the overall water *** oxide(GO)was used as a carbon matrix and in situ oxygen source,which was supported by the octahedral ptni alloy to form the ptxniy-GO *** calcinating in Ar atmosphere,the oxygen in GO induced the surface segregation of ni from the ptni octahedron to form a core-shell structure of ptx@***,the surface-enriched ni continuously induced the reformation of C in reduced graphene oxide(rGO)to enhance the degree of *** multi-step induction formed a nanocatalyst pt_(x)@ni_(y)-rGO which has very high catalytic efficiency and *** optimizing the feeding ratio of ptni(pt:ni=1:2),the electrolytic overall water splitting at 10 mA·cm^(-2) can be driven by an electrolytic voltage of as low as 1.485 V,and hydrogen evolution reaction(HER)only needs an overpotential of 37 mV in 1.0 M KOH aqueous ***,the catalyst exhibited consistent existence form in both HER and oxygen evolution reaction(OER),which was verified by switching the anode and cathode of the cell in the electrolysis of *** work provides a new idea for the synthesis and evaluation of the bifunctional catalysts for water splitting.

关键词： continuous induction core-shell structured pt@ni graphene oxide hydrogen evolution reaction alkaline water splitting

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