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复杂的降解机制可用于模拟催化剂上的离子交换膜离子体,NiO和IrO₂

Mai-Anh Ha¹, Emily K Volk^2,3, Oliver Leitner¹

¹Computational Science Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States.

ACS electrochemistry

|August 13, 2025

概括

离子交换膜 (AEM) 电解需要稳定的离子体来实现成本竞争力. 某些离子体-催化剂组合,如NiO上的Sustainion和Versogen,显示出氧化演化反应 (OER) 的卓越稳定性和活性.

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
计算化学计算化学

背景情况:

阳离子交换膜 (AEM) 电解正在成为对质子交换膜 (PEM) 电解的经济有效替代方案.
在离子体-催化剂接口上的离子体稳定性对于AEM电解性能和寿命至关重要.
了解离子体降解机制是改善AEM电解技术的关键.

研究的目的:

调查各种离子体在不同催化剂上的降解机制,这与AEM电解有关.
为了确定稳定和活跃的离子体-催化剂组合,以实现高效的氧化演化反应 (OER).
在模拟的AEM电解条件下比较不同类型的离子体稳定性.

主要方法:

在模型催化剂 (IrO2和NiO) 上使用离子体分子碎片进行理论计算.
降解途径的分析,包括SO4的产生,水的形成,氧化和脱质.
使用半细胞旋转盘电极 (RDE) 试验进行实验验证.

主要成果:

在IrO2和NiO催化剂上确定了四种离子体类 (Nafion,Sustainion,Versogen,四级类型) 的多种降解机制.
预测并验证了Sustainion和Versogen与NiO具有很高的稳定性和OER活性.
在初始突破后,这些组合观察到显著的性能增加 (7-8倍).
突出了Nafion和Sustainion在高电化学潜力下对IrO2的潜在降解问题.

结论:

苏斯坦尼和维索根离子体显示出OER在NiO催化剂上的稳定性和活性,这对于AEM电解至关重要.
离子体-催化剂接口的稳定性是推进AEM电解技术的关键因素.
通过实验RDE测试成功验证了理论预测,证实了特定的离子体-催化剂配对的潜力.

关键词:

有氧化二氧化 (IroO2)尼奥尼奥是什么意思阳离子交换膜电解的电解降解机制的降解机制接口接口接口接口接口离子体是什么? 离子体是什么氧气的进化氧气的进化

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