三元运算
材料科学
析氧
无定形固体
金属
电化学
催化作用
锌
电池(电)
化学工程
浸出(土壤学)
电极
纳米技术
冶金
化学
结晶学
物理化学
土壤水分
土壤科学
功率(物理)
生物化学
工程类
计算机科学
程序设计语言
环境科学
物理
量子力学
作者
Ali Saad,Yang Gao,Aymeric Ramière,Tianzhi Chu,Ghulam Yasin,Yanyan Wu,Shumaila Ibraheem,Miao Wang,Haichuan Guo,Panagiotis Tsiakaras,Xingke Cai
出处
期刊:Small
[Wiley]
日期:2022-03-28
卷期号:18 (17)
被引量:19
标识
DOI:10.1002/smll.202201067
摘要
Here, the synthesis of a series of pure phase metal borides is reported, including WB, CoB, WCoB, and W2 CoB2 , and their surface reconstruction is studied under the electrochemical activation in alkaline solution. A cyclic voltammetric activation is found to enhance the activity of the CoB and W2 CoB2 precatalysts due to the transformation of their surfaces into the amorphous CoOOH layer with a thickness of 3-4 nm. However, such surface transformation does not happen on the WB and WCoB due to their superior structure stability under the applied voltage, highlighting the importance of metal components for the surface reconstruction process. It is found that, compared with CoB, the W2 CoB2 surface shows a quicker reconstruction with a larger active surface area due to the selective leaching of the W from its surface. In the meantime, the metallic W2 CoB2 core underneath the CoOOH layer shows a better promotion of its oxygen evolution reaction (OER) performance than CoB. Therefore, the ternary W2 CoB2 shows better OER performance than the CoB, as well as the WB and WCoB. It is also found that the mixture of W2 CoB2 with Pt/C as the catalysts in air electrode for rechargeable Zn-air battery (ZAB), shows better performance than the IrO2 -Pt/C couple-based ZAB.
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