在平面上拓缺陷丰富的石墨烯作为有效的无金属催化剂,用于pH-通用H电合成
Zhixing Mou1, Yuewen Mu1, Lijia Liu2
1Institute of Crystalline Materials Institute of Molecular Science, Shanxi University, Taiyuan, 030006, China.
Small (Weinheim an der Bergstrasse, Germany)
|February 17, 2024
概括
这项研究引入了一种新型的无金属石墨烯催化剂,具有硫和缺陷,通过氧降解来有效合成过氧化 (H2O2). 催化剂在各种pH水平上表现出高生产率和稳定性.
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:
- 传统的过氧化 (H2O2) 合成的 antraquinone 工艺是能源密集的.
- 开发高效的无金属催化剂,通过2电子 (2e) 氧降解反应 (ORR) 直接合成H2O2,对于可持续的化学生产至关重要.
研究的目的:
- 为了合成和表征一种新的无金属催化剂,用于高效的H2O2生产.
- 在不同的电解质条件下研究开发材料的催化性能.
- 通过理论计算阐明增强的催化活性背后的机制.
主要方法:
- 在平面内拓缺陷的水热和化合成中,用五角形-硫和铁-协调 (SNC) 丰富了石墨烯.
- 在性,中性和酸性电解质中对2e-ORR的SNC催化剂进行电化学评估.
- 密度函数理论 (DFT) 计算,以了解电子结构调制和反应机制.
主要成果:
- 合成的SNC催化剂具有共接种的五角形-S和烯-N,形成S-C-N图案,调节石墨烯的原子和电子结构.
- 在性,中性和酸性电解质中,SNC表现出超高的H2O2生产率:分别为8.1,7.3和3.9molg催化剂-1h-1.
- 催化剂在pH-通用电解质中表现出长期的运行稳定性,超过了大多数报告的碳催化剂.
结论:
- 在SNC中缺陷的S-C-N图案在优化OH*中间体的结合方面非常有效.
- 这些图案显著降低了O2转化为H2O2的动力障碍,从而增强了2e-ORR的内在活性.
- 开发的SNC催化剂为高效和稳定的H2O2生产提供了一个有前途的无金属替代品.
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