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硫添加的Iro₂ 启用通路切换到格子氧气机制,增强低PEM水电解的稳定性

Chenlu Yang^1,2, Yanping Zhu³, Fengru Zhang⁴

¹Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China.

Advanced materials (Deerfield Beach, Fla.)

|June 23, 2025

概括

氧化物纳米粒子 (IrO2/S) 的硫化增强了质子交换膜水电解 (PEMWE),通过将氧化演化反应 (OER) 路径切换到晶格氧化机制 (LOM). 这一策略提高了活动和耐用性,同时显著减少了 (Ir) 的使用.

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:

质子交换膜水电解 (PEMWE) 工业化在平衡高活性,稳定性和减少 (Ir) 使用方面面临挑战.
在IrO2催化剂上的常规氧演化反应 (OER) 路径通常会限制效率和耐用性,特别是在低Ir负载下.

研究的目的:

为IrO2纳米颗粒 (IrO2/S) 制定硫兴奋剂策略,以增强PEMWE中的OER活动和稳定性.
研究由硫注射诱导的机制从吸附演化机制 (AEM) 转变为晶格氧机制 (LOM).
为了使成本效益高的PEMWE能够显著减少IR负载.

主要方法:

用硫添加的IrO2纳米粒子 (IrO2/S) 的合成.
在PEMWE中OER性能的电化学表征.
先进的光谱学和理论计算以阐明反应机制和催化剂结构-活性关系.

主要成果:

硫兴奋剂诱导了IrO2从AEM转变为LOM,增强了固有的活性和耐久性.
S协调动机增加了中心的电子密度和O共值,促进了LOM.
2 / S催化剂实现了低电池电压 (1.769V在2.0A cm-2) 和长期稳定 (16.6μVh-1超过1000小时) 与减少的负荷 (0.3毫克cm-2).

结论:

硫注射是一种可行的策略,可以触发LOM并稳定PEMWE的基于Ir的催化剂中的晶格氧氧还原.
这种方法为开发高度活跃和持久的低收入小微企业提供了一个新的途径.
这项研究表明,量身定制的兴奋剂策略有潜力克服电化学能量转换的关键挑战.

关键词:

在PEM中,水电解是水的电解.和的价值观和的价值观晶格式氧气机制晶格式氧气机制氧气进化反应反应氧气进化反应氧气无结合状态氧气无结合状态

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