在酸性OER中用于稳定的RuOx的协同Fe/Co兴奋剂和空缺工程
Yan Zhao1, Luyao Li1, Zeyu Wang1
1State Key Laboratory of Solidification Processing, Atomic Control & Catalysis Engineering Laboratory (ACCEL), School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an, ShaanXi 710072, P. R. China.
这项研究通过用铁或来增强水电解的二氧化 (RuO2) 催化剂. 这提高了稳定性和催化活性,对于质子交换膜水电解剂 (PEMWE) 的高效氧化演变反应 (OER) 至关重要.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 二氧化鲁 (RuO2) 是质子交换膜水电解剂 (PEMWE) 氧化反应 (OER) 的关键催化剂.
- 在酸性电化学条件下,RuO2的长期稳定性受到 (Ru) 溶解的限制.
研究的目的:
- 提高基于RuO2的催化剂的稳定性和性能.
- 研究金属兴奋剂 (Fe,Co) 和氧空置工程对RuO2稳定性的联合影响.
主要方法:
- 合成含有Fe的 RuO2 (Fe-RuOx,Co-RuOx) 催化剂.
- 在酸性电解质中的催化活性和稳定性的电化学特征.
- 质子交换膜水电解器 (PEMWE) 的测试.
- 密度函数理论 (DFT) 模拟以阐明反应机制.
主要成果:
- Fe-RuOx和Co-RuOx催化剂表现出较低的超电位 (191 mV和203 mV在10 mA cm-2) 和持久的稳定性 (> 500 h) 与微不足道的降解.
- 使用这些化催化剂的PEMWE在100 mA cm-2下稳定运行超过250小时.
- 兴奋剂降低了Ru的价值,增加了氧的空缺,增强了催化活性,抑制了Ru的溶解.
结论:
- 结合金属和氧空位工程有效地提高了OER的RuO2催化剂的稳定性和性能.
- 铁和可以减弱OOH*吸附,增加表面重建能量,从而提高耐用性.
- 这一战略为设计用于酸性水电解的基于Ru的先进催化剂提供了宝贵的见解.
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