在自支持的Ni单原子催化剂中构建Ni-Nx活性位点,以有效地将CO2降低到CO
Xuemei Zhou1, Chunxia Meng1, Wanqiang Yu1
1Institute for Advanced Interdisciplinary Research (iAIR), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
这项研究引入了一种新的--碳纤维催化剂,用于电化学二氧化碳减排 (CO2RR). 自支持的催化剂实现了高的二氧化碳选择性,提供了稳定高效的二氧化碳利用方法.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 电化学二氧化碳减排 (CO2RR) 是二氧化碳利用的关键.
- 单原子过渡金属 (M-Nx) 催化剂提供高效率,但面临聚合问题.
- 现有的合成方法在高温过程中与金属颗粒聚合作斗争.
研究的目的:
- 为CO2RR开发一种稳定,高性能的单原子催化剂.
- 为了克服M-Nx催化剂中的金属颗粒聚合.
- 为增强催化剂稳定性,创建一个自承载电极结构.
主要方法:
- 通过电制造一个Ni-doped聚乙烯化物 (PVDF) 纤维膜.
- 控制PVDF膜的碳化形成一个的3D自支持单原子Ni催化剂 (Ni-N-CF).
- 使用X射线光电子谱学 (XPS) 和X射线吸收细结构 (XAFS) 的表征.
主要成果:
- Ni-N-CF催化剂表现出稳定,网状结构,可以在碳化过程中抵抗崩.
- XPS和XAFS证实了Ni-N协调结构的形成,Ni处于低氧化状态.
- 催化剂实现了异常的CO选择性,CO2RR的法拉第效率 (FE) 为92% ,并证明了电极稳定性.
结论:
- 调整原子分散的Ni的局部协调会激活有效的CO2RR的催化站点.
- 开发的Ni-N-CF催化剂为设计高性能单原子催化剂提供了新的策略.
- 自支持架构有效地解决了CO2RR应用中的电极不稳定问题.
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