在性介质中改善氧气演化反应的COMn气凝电子结构的酸化调节
Xianxing Zhou1, Pan Zhu2, Jiaming Tan1
1New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou, China.
ChemSusChem
|November 19, 2025
概括
- 气凝的酸化可以为氧化演化反应 (OER) 创造廉价的电催化剂. 这提高了水分和电池的性能,为贵金属提供了稳定和活跃的替代品.
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:
- 为氧化演化反应 (OER) 开发高效的电催化剂对于水分裂和金属空气电池等绿色能源技术至关重要.
- 基于非贵金属的催化剂因其成本效益和替代昂贵贵金属的潜力而受到追捧.
研究的目的:
- 开发一种廉价,高活性,稳定的OER电催化剂,采用易酸化方法.
- 改善- (CoMn) 气凝在性介质中的OER电子结构和催化性能.
主要方法:
- 使用易于酸化的方法合成了PO4^3--CoMn-Aerogel催化剂.
- 电化学性能在1M KOH中进行了评估,包括超电位,电流密度和Tafel斜率.
- 在35小时内评估了长期稳定性.
- 用多种表征技术和密度函数理论 (DFT) 计算来分析催化剂的电子结构和反应机制.
主要成果:
- PO4^3--CoMn-Aerogel催化剂表现出极好的OER性能,在10 mA cm^-2时具有254.4 mV的低超电位,Tafel斜率为101.98 mV dec^-1.
- 与RuO2基准相比,催化剂表现出优越的性能.
- 它表现出强大的长期稳定性,在没有显著的电流衰变的情况下运行了35小时.
- DFT的计算证实,化降低了OER中决定速度的*O到*OOH转化步骤的自由能量障碍,为0.82 eV.
结论:
- 酸化是一种有效的策略,可以调节电子结构并提高过渡金属气凝电催化剂的OER性能.
- 开发的PO4^3--CoMn-Aerogel催化剂为大规模电化学应用提供了一个有希望的,具有成本效益和稳定的替代方案.
- 这种方法为设计用于可持续能源技术的先进电催化剂提供了一条途径.
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