对于酸性氧的演化而言,在 manganite 上的高活性 IrOx 形成
Jia Wei Zhao1, Kaihang Yue2, Zhihao Pei1
1Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|November 5, 2025
概括
研究人员开发了一种新型催化剂,使用低负载来进行氧化演化反应 (OER). 这种进步提高了开放式电源的活动和耐用性,克服了电化学应用中的一个关键挑战.
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:
- 基于的氧化物是有效的氧化演化反应 (OER) 催化剂,但需要高 (Ir) 含量,阻碍商业使用.
- 在保持高活性和耐久性同时降低Ir负荷是OER催化的一个关键挑战.
研究的目的:
- 为了合成具有增强OER活性和稳定性的低Ir负载催化剂.
- 通过先进的表征和理论计算,研究催化剂性能背后的机制.
主要方法:
- 酸纳米纤维的多孔电.
- 水热合成以加载短程订购的氧化 (IrOx).
- 在现场表征 (X射线吸收光谱学,拉曼光谱学,微分电化学质谱学,同步辐射红外光谱学) 和理论计算.
主要成果:
- 成功合成了具有低Ir负载的多孔石酸纳米纤维,并装饰了短程订制的IrOx.
- 在使用现场技术的OER期间确认了IrOx的结构稳定性.
- 证明 (Mn) 抑制了晶格氧气机制,有利于OER稳定吸附物进化机制.
结论:
- 合成的催化剂表现出高的OER活性 (221 mV在10 mA cm-2的超电位) 和出色的稳定性 (≈1000 h) 显著降低了Ir负载.
- 这些发现为开发具有成本效益和高性能的OER催化剂提供了一个有希望的战略.
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