第一作者：Wenjuan Xu

通讯作者：Hongbin Sun,Yang, Yang

合写作者：Jinfa Chang, Yinggang Cheng, Hongqi Liu, Jifan Li, Yongjian Ai, Zenan Hu, Xinyue Zhang, Yiming Wang, Qionglin Liang

发表刊物：Nano Research

期号：2

卷号：15

影响因子：9.5

DOI码：10.1007/s12274-021-3582-x

所属单位：Department of Chemistry, Northeastern University

教研室：物理化学

刊物所在地：PEOPLES R CHINA

摘要：Devising an electrocatalyst with brilliant efficiency and satisfactory durability for hydrogen production is of considerable demand, especially for large-scale application. Herein, we adopt a multi-step consequential induced strategy to construct a bifunctional electrocatalyst for the overall water splitting. Graphene 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 precursor. When 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 Pt-x@Ni-y. Then, the surface-enriched Ni continuously induced the reformation of C in reduced graphene oxide (rGO) to enhance the degree of graphitization. This multi-step induction formed a nanocatalyst Pt-x (C)Ni-y-rGO which has very high catalytic efficiency and stability. By 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 solution. Additionally, 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 water. This work provides a new idea for the synthesis and evaluation of the bifunctional catalysts for water splitting.

关键字：continuous induction，core-shell structured Pt@Ni，graphene oxide, hydrogen evolution reaction, alkaline water splitting

论文编号：WOS:000694799100001

学科门类：理学

一级学科：化学

页面范围：965-971

ISSN号：1998-0124

是否译文：否