稳定硫位点在四氧化四面体协调结构中,用于高效的电化学氧化水
1State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Frontiers Science Centre for Rare Isotopes, Lanzhou University, Lanzhou, 730000, China.
Angewandte Chemie (International ed. in English)
|December 7, 2023
概括
将硫原子封装成氧化 (NiO) 形成了一个独特的S-O4结构,显著提高了氧演化反应 (OER) 电催化剂的性能. 这种四氧四面体结构通过促进晶格氧气交换来增强活动和稳定性.
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:
- 离子调节是开发用于氧化演化反应 (OER) 的先进电催化剂的关键策略.
- 过渡金属氧化物为OER电催化提供了潜力,但活性和稳定性需要改进.
- 阳离子修饰可以调整阴离子活性位点的电子结构,增强催化活性.
研究的目的:
- 通过精确的离子工程来引入一种用于提高电催化剂性能的新方法.
- 为了研究氧化 (NiO) 中四氧化四面体协调结构 (S-O4) 的形成和影响.
- 为了证明四氧化氧四面体结构在提高过渡金属氧化物OER性能方面的普遍适用性.
主要方法:
- 在四面体位点用封装的S原子合成硫氧化 (S-NiO-I).
- 密度函数理论 (DFT) 的计算分析了S-NiO-I.I.的电子结构和稳定性.
- 操作振动光谱和质谱,以探测OER期间的反应机制和结构演变.
主要成果:
- 在NiO网格 (S-NiO-I) 中成功形成稳定的S-O4四四面体结构.
- DFT和光谱证据证实了S-O4和Ni-S结构的稳定性.
- 确定S-O4结构对于触发格子氧气交换至关重要,这是OER的一个关键过程.
结论:
- 在NiO中封装硫以形成S-O4结构是提高OER活动和稳定的有效策略.
- 四氧氧四面体协调是改进过渡金属氧化物OER性能的一种通用结构动机.
- 这项工作为通过控制离子环境来设计高性能电催化剂提供了新的途径.
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