在高离子强度下同时减少氧气和氧化水,用于可扩展的过氧化电合成
Changmin Kim1, Sung O Park2, Sang Kyu Kwak2,3
1Australian Carbon Materials Centre (A-CMC), School of Chemical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.
Nature communications
|September 19, 2023
概括
缺氧的矿氧化物使过氧化 (H2O2) 的高效电合成成为可能. 这些新的双功能电催化剂在无膜电解器中实现了高效的氧降解和水氧化.
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:
- 过氧化 (H2O2) 的电合成为传统方法提供了一个可持续的替代方案.
- 在高电流密度下实现H2O2电合成的高法拉达效率仍然是一个重大挑战.
研究的目的:
- 为高效的H2O2电合成开发新的双功能电催化剂.
- 研究氧气空缺在促进选择性两电子转移反应中的作用.
主要方法:
- 合成缺乏氧气的Pr1.0Sr1.0Fe0.75Zn0.25O4-δ矿氧化物.
- 电化学表征,包括循环电压测量和时测量.
- 无膜电解仪的制造和测试.
主要成果:
- 合成的矿氧化物在高电流密度 (>50 mA cm-2) 时显示出优异的法拉第克效率 (~99%) 来减少高电流密度的氧气.
- 两电子水氧化反应的高选择性 (~80%) 在低超电位 (0.39 V) 时得到.
- 在50 mA cm-2.2的无膜电解器中,实现了163.0%的创纪录的Faradaic效率.
结论:
- 缺乏氧的矿氧化物是H2O2电合成的有效双功能电催化剂.
- 开发的无膜电解系统可实现可扩展和高效的H2O2生产.
- 这项工作为可持续的H2O2产生提供了一个有希望的途径.
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