通过潜在控制的活性位点中间相互作用,增强低度的NO到NH的电还原3
Xiaoxi Guo1,2, Tongwei Wu3, Hengfeng Li2
1Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics, Central South University, 410083, Changsha, Hunan, P. R. China.
这项研究表明,电极电位如何控制催化剂活性位点,以有效地将氧化 (NO) 电还原为氨 (NH3). 这种方法提高了催化剂的性能,即使在低NO度下也是如此.
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:
- 催化剂中的电子缺陷状态对于将氧化 (NO) 电还原为氨 (NH3) (NORR) 是至关重要的.
- 催化剂活性部位结构随着电极电位的变化而动态变化,影响中间相互作用和电催化性能.
- 对于设计先进的电催化系统来说,了解活性位点相互作用中的潜在诱导的动态变化是关键.
研究的目的:
- 调查电极电位如何影响NORR.期间的活性位点-中间相互作用.
- 开发一种使用电极潜力的策略,以控制这些在氧空位修改的TiO2 (VO-TiO2-x) 催化剂上的相互作用.
- 通过应用潜力调整催化剂活性位点来提高NORR性能.
主要方法:
- 使用恒定的内部电位 (CIP) 密度函数理论 (DFT) 计算.
- 在现场使用 (光谱) 电化学测量.
- 结合理论计算和实验验证,研究对NORR的潜在影响.
主要成果:
- 应用的电极电位改变了Ti3+退化轨道的空间对称性,促进了NO转化为NH3的关键中间生成.
- VO-TiO2-x催化剂表现出优越的NORR性能:76.4%的NH3法拉代效率和632.9μg h-1 mgcat-1 NH3产率在1.0vol%的NO.
- 在相同条件下,在膜电极组件 (MEA) 电解器中实现了创纪录的NH3产量2292.7 μg h-1 mg cat-1 在相同条件下.
结论:
- 电极潜力是一种有效的工具,可以动态控制催化剂活性位点并提高NORR性能.
- 该VO-TiO2-x催化剂显示出对NO转化为NH3的高效和选择性的电催化转化具有显著的希望.
- 这项工作通过优化操作条件,补充传统的材料设计方法,为改善电催化活性开辟了新的途径.
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