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为质子交换膜水电解剂设计优质电催化剂:催化剂稳定性和演变的重要性

Xiaoxuan Guo¹, Yongsheng Wang¹, Wei Zhu¹

¹State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.

|November 21, 2023

概括

质子交换膜水电解 (PEMWE) 提供绿色,但面临着催化剂稳定性的挑战. 了解和解决演变反应 (HER) 和氧演变反应 (OER) 期间的催化剂演变是高效PEMWE系统的关键.

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
绿色能源绿色能源

背景情况:

质子交换膜水电解 (PEMWE) 是绿色生产的关键技术,由于其高效率和紧的设计.
催化剂稳定性仍然是一个重要的障碍,限制了PEMWE设备中新型电催化剂的应用.
在运行过程中催化剂和催化剂层的演变被确定为不稳定的首要原因.

研究的目的:

对于水电解来说,定义与随时间的活性相关的催化剂稳定性.
在酸性介质中识别和分类在演化反应 (HER) 和氧演化反应 (OER) 中电催化剂不稳定的内部和外部来源.
审查和总结目前在PEMWE中增强电催化剂稳定性的战略.

主要方法:

分析催化剂活动作为时间的函数来评估稳定性.
在酸性环境中追踪HER和OER电催化剂的不稳定源.
将不稳定源分为内部和外部类别的分类.
关于稳定性改善策略的最新文献的审查.

主要成果:

催化剂的不稳定性归因于在电解过程中催化剂或催化剂层的动态演变.
追踪和分类了HER和OER的不稳定性来源.
确定了改善催化剂稳定性的五个关键策略:热力学稳定的活性站点建设,预催化剂设计,支调节,超湿电极制造和催化剂-离子体接口工程.

结论:

对不稳定源的全面理解,在现场/现场表征和理论计算的帮助下,至关重要.
高活性和稳定的HER/OER电催化剂的合理设计可以通过解决已识别的稳定性挑战来实现.
这项研究有助于为商业PEMWE应用开发更强大的电催化剂.

关键词:

改进策略改进策略不稳定的来源是不稳定的来源.稳定的稳定性稳定的稳定性水的电解是水的电解.

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