防止合金电催化剂在空气中的分离,使用牺牲性被动化覆盖层
Ezra L Clark1, Degenhart Hochfilzer1, Brian Seger1
1SurfCat Section for Surface Physics and Catalysis, Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
The journal of physical chemistry. C, Nanomaterials and interfaces
|January 17, 2024
概括
合金电催化剂由于金属分离而在空气中降解. 一种新的氧化封装方法可以保护合金,保持其组成和活性,以获得可靠的电子结构和电催化测量.
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
- 表面科学是一门学科.
背景情况:
- 合金电催化剂,特别是金属间催化剂,当暴露在空气中时容易发生表面分离.
- 这种由电子差异驱动的分离,埋葬了不太反应性的金属,改变了催化性能.
- 在超高真空 (UHV) 特性和环境条件电催化测试之间存在很大的差距.
研究的目的:
- 开发和验证一种新的实验方法,以弥合合金表征中的压力差距.
- 为了保护合金表面在转移和处理期间免受空气诱导的分离.
- 为了使近表面电子结构和电催化活性之间可靠的相关性.
主要方法:
- 合金表面的封装用牺牲性氧化 (Al2O3) 被动化覆盖层.
- 在潜在控制下,在性电化学环境中去除Al2O3覆盖层.
- 保护合金近表面成分的表征和电催化活性的验证.
主要成果:
- 氧化覆盖层有效地防止了合金成分的空气诱导分离.
- 被保护的合金表面表现出接近表面的组成,在暴露在空气中后与散装材料一致.
- 保护方案没有改变基准电催化剂的电催化活性.
结论:
- 开发的封装方法成功地弥合了HV和环境条件之间的压力差距.
- 这种方法可以通过保持它们原始的表面成分来准确评估合金电催化剂的特性.
- 实施方便了电子结构和电催化性能之间的可靠相关性.
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