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在Co₃O₄中调整氧气空缺的电催化剂,以提高尿素氧化和水分的有效性

Pandian Mannu¹, Ranjith Kumar Dharman², Ta Thi Thuy Nga^1,3

¹Department of Physics, Tamkang University, New Taipei City, 25137, Taiwan.

Small (Weinheim an der Bergstrasse, Germany)

|October 22, 2024

概括

这项研究开发了一种新的非贵金属电催化剂 (Mo-Co3O4-3) 用于高效的进化 (HER),氧进化 (OER) 和尿素氧化 (UOR). 催化剂在性介质中表现出色,为先进的电化学应用展示了可行的策略.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

在性介质中,开发非贵金属电催化剂对于高效的进化 (HER),氧进化 (OER) 和尿素氧化 (UOR) 是至关重要的.
现有的催化剂在多功能电化学过程中经常在性能和稳定性方面扎.

研究的目的:

为了合成和表征一种基于可增强HER,OER和UOR的氧化 (Mo-Co3O4) 的多功能电催化剂.
调查氧气空缺和兴奋剂在Mo-Co3O4系统催化活性中的作用.

主要方法:

将 (Mo) 融入氧化物 (Co3O4) 中,以产生氧气空缺 (Vo).
在现场/操作中使用X射线吸收光谱 (XAS) 来探测OER期间的活性点.
在现场/操作拉曼光谱分析催化机制.

主要成果:

Mo-Co3O4-3促进了富含氧气的空缺,促进了酸盐吸附和激活尿素电解.
XAS发现氧气空缺有助于OH•吸附,Co前氧化和Co-OOH•中间重建.
在10 mA cm-2.2时,Mo-Co3O4-3对HER (141 mV),OER (220 mV) 和UOR (1.32 V) 呈现出较低的超电位.
拉曼光谱学突出显示了Mo-Co3O4-3中的CoOOH活性位点,与纯Co3O4.4相比,其性能优越.
使用Mo-Co3O4阳极和阴极的尿素电解器在10mA cm-2.2时达到1.42V.

结论:

在Mo-Co3O4中使用兴奋剂和氧气空缺的协同工程是开发高性能UOR电催化剂的有效策略.
由于其多功能催化活性,Mo-Co3O4-3催化剂在水分解和尿素电解中的应用具有显著的潜力.
了解氧气空缺和活跃地点的作用,为设计下一代电催化剂提供了洞察力.

关键词:

氧气进化反应反应氧气进化反应有空缺的氧气位尿素氧化反应是尿素的氧化反应.射线吸收光谱X射线吸收光谱

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