通过工程子子纳米集群进行加速质子合电子转移,用于可扩展的过氧化电合成
Yan Li1,2, Yingnan Liu1, Xianyun Peng3
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
Angewandte Chemie (International ed. in English)
|September 10, 2024
概括
过氧化 (H2O2) 的电合成使用在二化纳米片上的新子纳米集群进行了改进. 这一进步克服了在中性和性条件下的运动限制,以有效地生产H2O2.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 过氧化 (H2O2) 通过两电子氧降解反应的电合成是一种可持续的替代能源密集型的人体工艺.
- 目前的方法在中性和性介质中面临挑战,原因是水分离速度缓慢,阻碍了中介O2*到OOH*转换的质子合电子转移.
研究的目的:
- 开发一种高效的电催化剂,用于在中性/性条件下进行H2O2合成.
- 增强水解离和质子转移的动力学,以提高电合成性能.
主要方法:
- 在二化纳米片 (Pd SNCs/NiTe) 上支持的子纳米集群的合成.
- 电化学表征,包括循环电压测量和时测量.
- 现场光谱研究 (X射线吸收,ATR-FTIR) 和理论计算 (DFT).
- 在流量电池设置中的性能评估.
主要成果:
- Pd SNCs/NiTe2实现了99%的H2O2选择性和0.81V的开始电位转移.
- 催化剂显著降低了水解离能障碍,促进了质子动力学.
- 在100 mA cm-2时,最大的H2O2产率为1.75 mmol h-1 cm-2和95%的电流效率.
- 在10小时后,持续的H2O2产量达到1.43mol L-1.
结论:
- Pd SNCs/NiTe2证明了H2O2电合成的卓越性能,克服了关键的动力限制.
- 催化剂的设计有效地促进了水解离和质子转移,这对于高效的双电子氧降解至关重要.
- 这项工作突出了支持子纳米集群催化剂的潜力,以实现实用和可扩展的H2O2生产.
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