揭示pH依赖吸附强度的*CO2中介高密度Sn单原子催化剂的酸性CO2到HCOOH电还原
Bin Sun1, Zaiqi Li1, Difei Xiao1
1State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
高密度锡单原子催化剂可促进酸性二氧化碳减少为酸. 了解中间吸附强度是偏好CO2RR而不是HER的关键,以实现碳中和.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 酸性电化学二氧化碳减排 (CO2RR) 对于碳中性甲酸 (HCOOH) 生产至关重要.
- 竞争的进化反应 (HER) 限制了CO2RR的效率.
- 控制酸性电解质中的中间吸附对于选择性CO2RR至关重要.
研究的目的:
- 研究Sn单原子催化剂 (SAC) 上的pH依赖的中间吸附.
- 使用Sn SACs来增强酸性CO2RR,用于使用Sn SACs直接生产HCOOH.
- 了解有利于CO2RR而不是 HER的机制.
主要方法:
- 高密度Sn单原子催化剂 (SAC) 的制备.
- 在pH=3.3的电化学性能评估.
- 在现场减弱的总反射里埃变换红外光谱 (ATR-FTIR).
主要成果:
- Sn SACs 在 -178.5 mA cm-2.2 的 HCOOH 生产中实现了90.8%的法拉代克效率.
- 在Sn SACs附近观察到一个有利于CO2RR的性微环境.
- 阐明了*CO2-中间体的pH依赖的吸附强度.
结论:
- Sn SACs有效地促进酸性CO2RR转化为HCOOH.
- 调整中间吸附强度对于抑制HER来说至关重要.
- 这项工作为优化碳中和燃料生产的催化剂提供了洞察力.
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