阴离子半径控制的Sn-O键长度增强CO2电还原对Sn基矿氧化物
Mingfa Chen1, Kuan Chang1, Yu Zhang2,3
1Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 214122, Wuxi, China.
研究人员优化了基于锡的矿氧化物,以实现高效的二氧化碳电还原 (CO2 RR) 到酸 (HCOOH). 通过A-site阴离子半径调整控制锡氧键长度,显著提高了CO2 RR活性和选择性.
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:
- 基于锡的矿氧化物显示出对二氧化碳电还原 (CO2 RR) 的承诺.
- 合理的设计策略来优化它们的二氧化碳RR性能是不发达的.
研究的目的:
- 开发一种增强二氧化碳电还原到酸 (HCOOH) 的策略,使用基于Sn的矿氧化物.
- 研究A位点阴离子半径对Sn-O键长度的影响及其对CO2 RR特性的影响.
主要方法:
- 合成的Ba1-x Srx SnO3矿氧化物,具有不同的A位点阴离子半径.
- 通过调整Ba和Sr的比率来系统控制Sn-O键的长度.
- 评估CO2 RR性能,包括HCOOH生产的活性和选择性.
主要成果:
- 平均A位点阴离子半径的下降缩短了Sn-O键的长度.
- CO2 RR活性和HCOOH的选择性表现出具有Sn-O键长度的火山类趋势.
- Ba0.5 Sr0.5 SnO3表现出高活性 (753.6 mA·cm-2) 和选择性 (90.9%) 的最佳性能.
结论:
- 现场半径控制的Sn-O键长是优化基于Sn的矿氧化物对CO2RR的有效策略.
- 优化的Sn-O键改善了带中心调节,中间吸附/激活,并减少了HCOOH形成的能量障碍.
- 这为设计先进的基于Sn的矿氧化物提供了新的途径,用于高效的二氧化碳电还原.
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