将氧化物的晶体结构和面部与它们对CO2电还原活动的相关性
Jiajun Wang1, Guangjin Wang2, Han Wu1
1School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China.
了解氧化 (In2O3) 水晶相和表面如何影响二氧化碳电还原 (CO2RR) 是关键. 有111个面积的立方In2O3显示出用于酸生产的最高活性.
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:
- 建立结构-功能关系对于设计二氧化碳电还原反应 (CO2RR) 的有效催化剂至关重要.
- 氧化 (In2O3) 已被认为对酸产生具有选择性,但其结晶相和表面对CO2RR活性的影响尚不清楚.
- 这种知识差距阻碍了In2O3的优化以提高内在活性和识别优质催化结构.
研究的目的:
- 研究不同晶相 (立方和六角) 和In2O3稳定表面对CO2RR性能的影响.
- 阐明在In2O3.3.中控制CO2RR活动的结构-功能关系.
- 为改善基于In2O3的催化剂提供基本理解,并指导电催化材料的合理设计.
主要方法:
- 通过理论计算,研究了各种In2O3晶相和表面 (立方 (111), (110);六角 (120), (104)) 上的反应物的吸附.
- 立方In2O3纳米片的实验合成,其表面主要是暴露的 (111).
- 合成的In2O3对CO2RR的电化学评估,包括法拉第效率和电流密度测量.
- 使用立方In2O3阴极组装一个水性Zn-CO2电池.
主要成果:
- 理论分析表明,与六角 In2O3 相比,立方 In2O3 上的反应剂吸附力更强,立方 (111) 表面被确定为最活跃的.
- 实验结果显示,立方In2O3纳米片与露面 (111) 表面实现了高HCOO-法拉第效率87.5%和电流密度-16.7mA cm-2在-0.9V与RHE.
- 组装的水性Zn-CO2电池证明了立方In2O3作为阴极材料的潜力.
结论:
- 该研究成功地将In2O3晶相和表面与CO2RR活性相关联,突出了立方 (111) 阶段的优越性能.
- 在CO2RR中建立了对In2O3的结构-活性关系的基本理解,为催化剂改进铺平了道路.
- 这些发现为有针对性的合成具有最佳相和表面的材料提供了指导原则,以实现高效的电催化.
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