XAFS study on the impact of local structure on electrochemical performance for Co3O4 nanowire arrays

16th International Conference on X-ray Absorption Fine Structure

Jiang, Shan^1 ; Cheng, Weiren^1 ; He, Jingfu^1 ; Huang, Junheng^1 ; Liu, Qinghua^1 ; Jiang, Yong^1 ; Wei, Shiqiang^1

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui

230029, China^1

关键词: Catalyst material;    Electrochemical activities;    Electrochemical performance;    Electrochemical reactions;    Local structure;    Semiconductor electrode;    X-ray absorption fine structure spectrum;    X-ray absorption near-edge structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012115/pdf
DOI  :  10.1088/1742-6596/712/1/012115

来源: IOP

【 摘 要 】

Determining the local structure of catalyst materials is critical for understanding the mechanism of enhanced electrochemical activity in semiconductor electrode. Here, using X-ray absorption fine structure (XAFS) spectra, we reveal that the local disorder structure is formed for the mixed-phase Co3O4nanowire arrays due to the interaction between the phases of Co3O4and Co2(OH)2CO3. Comparing to pure Co3O4nanowire arrays, the mixed phase sample is richer in Co2+and the electronic structure is changed by the local structure, which are demonstrated by the X-ray absorption near-edge structure (XANES) spectra. It is deduced that the mixed-phase Co3O4nanowire arrays with abundant Co2+sites provide more redox centres in electrochemical reaction than the pure Co3O4nanowire arrays.