Enhancing Oxygen Evolution Reaction with Two-Dimensional Nickel Oxide on Au (111)

Author:

Zhang Handing1,Zhang Haoyu1,Wang Ruijing1,Lv Jiayu1,Huang Wugen2,Guo Chenyan1,Yang Fan1ORCID

Affiliation:

1. School of Physical Science and Technology, Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China

2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Abstract

The nature of the active sites of transition metal oxides during the oxygen evolution reaction (OER) has attracted much attention. Herein, we constructed well-defined nickel oxide/Au (111) model catalysts to study the relationship between the structures and their OER activity using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), electrochemical measurements, and density functional theory (DFT) calculations. The deposited nickel oxides on Au (111) were found to exhibit a two-dimensional (2D)/three-dimensional (3D) structure by regulating the annealing temperature. Combining STM, XPS and electrochemical measurements, our results demonstrated an optimal OER reactivity could be achieved for NiOx with a 2D structure on Au and provided a morphological description of the active phase during electrocatalysis.

Funder

National Natural Science Foundation of China

Science and Technology Commission of Shanghai Municipality

Analytical Instrumentation Center

Publisher

MDPI AG

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