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通过范德瓦尔斯层状氧化物中调节兴奋剂优化酸氧演化反应

Jia Ke¹, Wenxiang Zhu², Yujin Ji²

¹College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, P. R. China.

Angewandte Chemie (International ed. in English)

|January 6, 2025

概括

兴奋剂增强了耐酸的氧化催化剂,以提高水分的效率. 这一突破改善了氧气进化反应动力学和在酸性条件下的稳定性,这对于清洁能源技术至关重要.

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:

氧进化反应 (OER) 对于水的分裂至关重要,但由于缓慢的四电子转移过程而受到限制.
范德瓦尔斯分层氧化物为OER催化剂提供了希望,但它们在酸性介质中的稳定性是一个重大挑战.
兴奋剂是一种增强活性和稳定性的策略,但在没有结构损伤的多层氧化物中很难实现.

研究的目的:

为了成功地将耐酸 (Nb) 转化为范德瓦尔斯分层边缘共享的1T相氧化 (1T-IrO2).
研究Nb兴奋剂对酸性OER的1T-IrO2的催化活性和稳定性的影响.
通过理论计算阐明了通过理论计算来提高开放式资源表现的基础机制.

主要方法:

酸辅助热法用于将Nb化为1T-IrO2.2.
在0.5M H2SO4中进行电化学表征,以评估OER性能.
质子交换膜水电解仪测试用于长期稳定性评估.
密度函数理论 (DFT) 计算以研究反应机制.

主要成果:

Nb-doped 1T-IrO2 (Nb0.05Ir0.95O2) 在0.5M H2SO4中达到10mA cm-2的电流密度,在191mV的过电势下,在56mV的电压下超过了未使用的1T-IrO2.
Nb0.05Ir0.95O2在一个质子交换膜水电解器中在1.2 A cm−2下稳定运行超过50天.
DFT计算表明,Nb兴奋剂将潜在决定的步骤从OOH去质子化转移到O-OH合.

结论:

Nb兴奋剂是一种有效的策略,可以同时增强酸性OER的范德瓦尔斯层叠的氧化的活性和稳定性.
开发的Nb0.05Ir0.95O2催化剂显示了高效和耐用的水电解的巨大潜力.
了解机械转变为设计下一代电催化剂提供了洞察力.

关键词:

电触媒溶解是一种电触媒.有氧化二氧化 (IroO2)层层的结构是层层的结构.超稳定阶段的转基因.氧的演化反应反应的反应.

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