在低度下,通过空置工程FeOCl通过氧化电还原使氧化变成氨
Xiaoxi Guo1,2, Pai Wang3, Tongwei Wu3
1School of Materials Science and Engineering, Central South University, Changsha, 410083, Hunan, P. R. China.
Angewandte Chemie (International ed. in English)
|December 20, 2023
概括
我们使用FeOCl纳米板中的空位增强了氧化 (NO) 到氨 (NH3) 的电降解. 这一策略提高了NO的转化效率,并使NO的同时去除,NH3的生产和能源的产生成为可能.
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:
- 将氧化电降解为氨 (NORR) 对于减少排放和处理空气污染至关重要.
- 低NO度和缓慢的动力学阻碍了NORR的效率.
研究的目的:
- 在FeOCl纳米板 (FeOCl-VCl) 中使用 (Cl) 空缺的高效NORR开发一种新的战略.
- 通过缺陷的Fe位点来研究增强NO吸收和激活的机制.
主要方法:
- 密度函数理论 (DFT) 计算,以了解电子结构的变化.
- 在现场的X射线吸收近边结构 (XANES) 和减弱的全反射红外光谱 (ATR-IR) 用于机械研究.
- 使用FeOCl-VCl作为阴极的Zn-NO电池的制造和测试.
主要成果:
- 在FeOCl-VCl中的空缺会产生缺陷的Fe位点,从而增强NO的吸收和激活.
- 铁的低平均氧化状态促进了电子转移和产生关键的NHx中间体.
- FeOCl-VCl实现了91.1%的NH3法拉代效率和455.4μgcm−2h−1的高产率在1.0体积%的NO.
- 一个带有FeOCl-VCl阴极的Zn-NO电池达到6.2 mW cm-2.2的峰值功率密度.
结论:
- 空置策略有效地提高了NORR性能,即使在低NO度下也是如此.
- 缺陷的Fe位点在改善NO吸附,激活和随后减少到NH3中发挥着关键作用.
- 这项工作提出了一个有前途的方法,即通过NORR.R.同时进行环境修复和能源生产.
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