进口原子稀土站点来激活电触媒氧的电网氧和脊柱氧的电触媒氧演变
Xuan Wang1,2, Jinrui Hu1, Tingyu Lu1,2
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, 210023, Nanjing, China.
Angewandte Chemie (International ed. in English)
|October 9, 2024
概括
研究人员开发了一种新的稀土替代策略,用于螺旋氧化物,增强氧化演化反应 (OER) 催化剂. 这种方法激活了晶格氧氧氧还原,提高了水电解的效率和稳定性.
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:
- 脊柱氧化物是活性氧演化反应 (OER) 催化剂.
- 吸附物演化机制 (AEM) 限制了由于共价性竞争而对螺旋氧化物的OER性能.
- 需要一个新的策略来克服AEM扩展的限制.
研究的目的:
- 提出一种稀土位点替代策略,用于调整氧化氧化氧的氧化氧化氧.
- 在氧化演化反应 (OER) 中绕过吸附物演化机制 (AEM) 的局限性.
- 开发用于水电解的高活性和稳定的氧化螺旋催化剂.
主要方法:
- 将 (Ce) 纳入NiCo2O4的八面体部位,形成Ce-NiCo2O4.
- 理论分析包括密度函数理论 (DFT) 计算.
- 电化学表征,pH依赖性研究,现场拉曼光谱学和18O标记的电化学质谱学.
主要成果:
- Ce-NiCo2O4表现出增强的OER活动,具有较低的超电位和更好的稳定性.
- 用Ce替代的螺旋氧化物通过有利的晶格氧机制 (LOM) 途径运行.
- 直接证据证实了OER中的格子氧参与,归因于Ce 4f电子移位和电荷再分配.
结论:
- 稀土站点替代是一种有效的策略,用于调整OER的螺旋氧化物中的晶格氧氧氧还原.
- Ce-NiCo2O4催化剂在离子交换膜水电解器中表现出卓越的性能.
- 这项工作为设计先进的OER催化剂提供了对稀土增强的LOM机制的见解.
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