基于的氧化物进化催化剂的质量活动光利用深度分辨率光谱在各种酸盐与化物的存在下
Hiroki Komiya1, Keisuke Obata1, Oki Sekizawa2
1Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.
Angewandte Chemie (International ed. in English)
|February 3, 2025
概括
氧化物催化剂在水电解中的活性降低,这是由于不活性相在更厚的层中形成. 这种不活性相形成与基板有关,而不是化物离子.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 氧化演化反应 (OER) 对于水电解至关重要,但在动力学上是有限的.
- 氧化物 (CoOx) 呈现出高的OER电催化活性,具有大量活性位点的潜力.
研究的目的:
- 研究OER活动在基板上不同厚度的CoOx层内的分布.
- 了解影响OER性能的因素,包括基质相互作用和电解质组成.
主要方法:
- 深度分辨率X射线吸收光谱 (XAS) 和深度分析X射线光电子光谱 (XPS) 用于分析CoOx样本.
- 运行拉曼光谱法用于研究反应机制.
主要成果:
- 薄薄的CoOx膜 (~20 nm) 呈现出均的氧化,而较厚的膜 (~80 nm) 在表面附近呈现出活性氧化相.
- 在较厚的CoOx层中发现了显著的非活性 (Co0) 阶段,减少了质量活动.
- 这种不活性相形成归因于CoOx和Ti基质之间的替代反应.
结论:
- 在Ti基板上的较厚的CoOx层中,不活跃的CoO0相形成限制了OER性能.
- 电解质中的酸盐,而不是化物离子,似乎影响了OER活性.
- 了解依赖深度的活动对于设计高效的OER电催化剂至关重要.
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