阶段工程通过晶格氧机制促进O-O合,以提高-铁的氧化演变
Zheng-Xin Qian1, Ge-Hao Liang1, Liang-Fei Shen1
1College of Materials, Institute of Artificial Intelligence, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, iChEM, Fujian Key Laboratory of Advanced Materials, College of Energy, Xiamen University, Xiamen 361005, China.
Journal of the American Chemical Society
|December 25, 2024
概括
在铁催化剂中的兴奋剂通过稳定活性点来提高氧演化反应 (OER) 的效率. 这项研究揭示了晶格氧介导机制,为先进的OER催化剂设计铺平了道路.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 基于铁 (NiFe) 的催化剂在性介质中具有高氧化反应效率 (OER).
- 对于OER的NiFe催化剂的优异性能,其确切的机制在很大程度上仍未得到阐明.
- 了解结构活动关系对于设计下一代电催化剂至关重要.
研究的目的:
- 阐明添加的NiFe纳米催化剂 (NiFeP) 的分子OER机制.
- 建立催化剂结构,反应中间体和性能之间的关系.
- 调查兴奋剂在增强OER活性和稳定性的作用.
主要方法:
- 用添加的NiFe纳米催化剂 (NiFeP) 的合成和表征.
- 现场电化学测量,包括1M KOH的OER活性和稳定性测试.
- 在现场隔离的纳米粒子增强的拉曼光谱,微分电化学质谱 (DEMS) 和密度函数理论 (DFT) 计算.
主要成果:
- NiFeP催化剂表现出异常的OER活性 (在10 mA cm-2时具有210 mV的超电位) 和稳定性.
- 通过结合实验和理论分析获得了格子氧介导的OER机制的直接证据.
- 发现兴奋剂稳定了活性β-Ni (Fe) OOH阶段,促进了*OH脱质和O-O合等关键的OER步骤.
结论:
- 这项研究揭示了OER在NiFeP催化剂上的详细分子机制.
- 兴奋剂通过稳定活性中间体在提高催化剂性能方面发挥着关键作用.
- 这些发现为设计高效且持久的OER催化剂提供了基本的见解.
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