用于高温电催化剂的溶解异质边界的定量解
Xiaoxin Zhang1, Xiao Xiao1, Qiuyue Zhang2
1College of Energy, Xiamen University, Xiamen 361005, China.
Journal of the American Chemical Society
|November 27, 2024
概括
在高温电催化过程中,溶解会增加氧化物的活性. 通过稳定中间体和改善氧气交换,NiO/LCTN边界显著增强了二氧化碳的电减.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 矿氧化物在高温电催化中表现出有限的活性.
- 溶解丰富了矿表面的反应相,形成异界.
- 这些复杂的接口的催化作用尚不清楚.
研究的目的:
- 用溶解的纳米粒子对矿薄膜的二氧化碳电还原 (CO2RR) 反应性进行定量分析.
- 阐明纳米粒子/矿界面的催化作用.
主要方法:
- 用溶解的Ni和NiO纳米粒子合成La0.4Ca0.4Ti0.94Ni0.06O3 (LCTN) 的薄膜.
- 跨度电化学表征.
- 密度函数理论 (DFT) 和初始分子动力学 (AIMD) 建模.
- 在二氧化碳电解过程中近环境压力X射线光电子光谱 (NAP-XPS).
主要成果:
- CO2RR活动与NiO/LCTN接口的边界长度有很强的相关性.
- 在800°C时,NiO/LCTN边界的转变频率 (TOF) 为7.05 ± 0.75 × 10^4 s^-1,显著优于Ni/LCTN和LCTN.
- 在NiO/LCTN边界的二氧化碳吸收有利于具有较低解离能障碍的双酸碳酸盐物种.
- 在NiO/LCTN边界观察到增强的氧气交换率和氧化碳中间体的稳定.
结论:
- 纳米粒子/矿接口,特别是NiO/LCTN,对于高温CO2电还原至关重要.
- 边界结构促进了二氧化碳的激活,氧离子的运输和中间稳定,从而提高了催化性能.
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