调整氧气空缺诱导的高价,以提高氧气演变反应性能,在自支持的NiFe-氧化电极中
Chun Kong1, Chuang Zhi1, Zirui Wu1
1School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.
Journal of colloid and interface science
|April 2, 2024
概括
我们通过调整氧空位 (VO) 来优化铁 (氧) 氧化电催化剂的氧化演化反应 (OER). 最佳VO度提高了OER的性能和耐用性,超过了当前的基准.
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:
- 铁 (氧) 氧化物是性介质中氧化演化反应 (OER) 的主要电催化剂.
- 优化它们的性能对于高效的能源转换技术至关重要.
- 氧气空缺 (VO) 在调整OER活动中的作用仍然是一个活跃的研究领域.
研究的目的:
- 为了可控地操纵氧空位 (VO) 度在NiFe-氧氧化物中.
- 为了研究VO度,Ni3+/Ni2+比率和OER性能之间的关系.
- 阐明VO缺陷增强开放资源活动的机制.
主要方法:
- 合成可调节的VO-可调节的NiFe-(oxy) 氧化电催化剂.
- 对OER活动和耐久性的电化学表征.
- 理论模拟以了解VO在水激活和解离中的作用.
主要成果:
- 在OER性能和VO度之间观察到火山类型的关系.
- 最佳的OER性能与Ni3+/Ni2+比率正相关.
- 最佳的催化剂 (30.3% Ni3+/Ni2+,23.8% VO) 在100 mA cm-2时实现了243 mV的超电位,具有120小时的耐用性.
结论:
- 氧气空缺显著增强了OER活性和NiFe-氧化的稳定性.
- 增强的性能归因于VO缺陷促进的改善的水激活和解离.
- 这项工作通过控制由VO诱导的超价比率来设计高性能电催化剂的新策略.
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