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在海水电解中,NiFe基阳极的微区酸化驱动的降解机制

Mengyi Tang^1,2, Kaifa Du^1,2, Rui Yu^1,2

¹School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, P. R. China.

ACS applied materials & interfaces

|January 15, 2024

概括

在海水电解器中,阳极的稳定性至关重要. 增加电解质pH值可以缓解微区酸化,改善NiFe基催化剂的性能和氧化过程中的稳定性,这对于高效的生产至关重要.

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
催化剂是一种催化剂.

背景情况:

阳极稳定性对于高效可靠的海水电解器至关重要.
基于NiFe的催化剂对氧演化反应 (OER) 是有前途的.
了解降解机制是改善催化剂寿命的关键.

研究的目的:

在模拟海水中的各种电解条件下研究基于NiFe的薄膜催化剂的稳定性.
为了阐明性海水中基于NiFe的阳极的降解机制.
通过电解质工程来确定增强阳极稳定的策略.

主要方法:

通过阳极氧化制备基于NiFe的薄膜催化剂.
在模拟的性海水 (1M KOH + 0.5M NaCl) 中对氧气演变性能和稳定性的电化学评估.
对电流密度和大量电解质pH对催化剂稳定性的影响进行系统分析.
电极降解和沉形成的特征.

主要成果:

基于NiFe的催化剂表现出令人满意的OER性能 (348 mV超电位在100 mA cm−2) 和稳定性 (>100 h) 在1 M KOH + 0.5 M NaCl.
电极稳定性对电流密度和散量pH高度敏感,在0.1M KOH中在20mA cm−2时失败,但在0.5M KOH中在500mA cm−2以上稳定.
在电极/电解质接口的微区域酸化被确定为离子加速腐蚀的主要原因.
根据降解行为确定了三个不同的操作区域 (稳定的OER,溶解-沉,被动化).

结论:

增加散装电解质的pH值有效地减轻了微区酸化,在高电流密度下显著改善了基于NiFe的阳极稳定性.
电解质工程,特别是pH控制,是提高海水电解器中阳极耐用性的可行策略.
这项研究为基于NiFe的催化剂降解机制提供了关键的见解,为更强大的海水电解技术铺平了道路.

关键词:

阳极氧化过程中的阳极氧化.电解质工程是电解质的工程.微区的酸化微区的酸化氧气演变反应 (OER) 是一种氧气演变反应.海水电解是海水的电解.

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