Co-Ni双金属氧化物与调整的表面氧空缺有效电催化降低酸盐到氨
Shouheng Xu1, Meichun Qin1, Jingqi Qi1
1Institute of Hybrid Materials, National Center of International Joint Research for Hybrid Materials Technology, National Base of International Sci. & Tech. Cooperation on Hybrid Materials, College of Materials Science and Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, PR China.
Journal of colloid and interface science
|October 10, 2024
概括
一种新型的氧化催化剂 (NiCo2O4),具有增强的氧空缺,通过酸盐电还原显著增加了氨生产. 这种催化剂实现了高产量和法拉第效率,为传统方法提供了更清洁的替代方案.
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:
- 酸盐 (NO3-) 电催化降解为氨 (NH3) 是传统工业氨合成的可持续替代方案.
- 目前的催化剂活动有限和法拉第效率 (FE) 低,阻碍了实际应用.
研究的目的:
- 开发一种高性能催化剂,以高效地将电催化酸盐降解为氨.
- 研究表面氧空缺 (OV) 在提高催化剂性能方面的作用.
主要方法:
- 通过控制化加热速率,制造具有不同表面OV含量的-双金属氧化物 (NiCo2O4) 催化剂.
- 对酸盐还原反应 (NO3RR) 活性,NH3产量和FE的催化剂的电化学评估.
- 在现场里叶变换红外光谱法 (FTIR) 阐明反应路径.
主要成果:
- 在5°C/分钟 (NiCo2O4-5) 烧焦的NiCo2O4表现出最高的表面OV含量.
- 较高的表面OV与改善的NO3RR活性,抑制的化物 (NO2-) 生产和增强的NH3选择性相关.
- NiCo2O4-5实现了94.4%的显著NH3 FE,产量为193.2 mmol/h g-1.
- 在现场FTIR证实,NiCo2O4-5有利于直接的NO3-到NH3通路.
结论:
- 调整表面OVs含有NiCo2O4的含量是一种可行的策略,可以提高电催化酸盐降解为氨的速度.
- 2O4-5催化剂表现出卓越的性能,显示出清洁和高效的氨生产的巨大潜力.
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