传动金属溶解与传动金属溶解对比 氧进化反应:对合金稳定性和电催化作用的影响
Annica Wetzel1,2, Daniel Morell1, Marcus von der Au1
1Bundesanstalt für Materialforschung und, Prüfung (BAM) Institution, Unter den Eichen 87, 12205, Berlin, Germany.
Angewandte Chemie (International ed. in English)
|February 18, 2024
概括
多主元素合金 (MPEA) 在酸性条件下在氧化演化反应 (OER) 过程中表现出意想不到的金属溶解. 这凸显了为准确评估催化剂效率需要量化金属离子释放的必要性.
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
- 腐蚀科学 腐蚀科学
背景情况:
- 多主元素合金 (MPEA) 为电化学应用提供可调节的性能.
- 它们在各种pH范围内的稳定性是一个关键优势.
- 然而,在特定的反应条件下,它们的行为需要详细的调查.
研究的目的:
- 为了研究金属溶解和氧化演化反应 (OER) 在等极CrCoNi合金中同时发生的情况.
- 开发和应用一种表征方案,以区分OER贡献与合金溶解.
- 了解MPEA中横流金属溶解的机制.
主要方法:
- 扫描电化学显微镜 (SECM) 用于OER发病的检测.
- 诱导合质谱 (ICP-MS) 和紫外线/紫外线光谱用于定量金属离子分析.
- 在现场电化学原子力显微镜 (EC-AFM) 观察表面形态变化.
主要成果:
- 在OER期间观察到CrCoNi合金在穿越区域的腐蚀性电解质 (0.1M NaCl,pH2) 中具有显著的金属溶解.
- 通过SECM,ICP-MS和UV/Vis光谱,成功地划分了OER和合金溶解.
- 据EC-AFM发现,晶体间腐蚀是横流溶解的主要机制.
结论:
- 在OER过程中,MPEA可以在没有明显的腐蚀指标的情况下发生横向溶解.
- 对OER催化剂的准确评估需要量化释放的金属离子.
- 金属离子释放可能会对电解剂效率和反应器组件完整性产生负面影响.
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