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铁杂质和含量对乙醇氧化催化剂的电化学性能和氧化进化选择性的影响

Colin F Crago^1,2, Simon Li², Ashton M Aleman^1,2

¹Department of Chemical Engineering, Stanford University, 443 Via Ortega, Stanford, California 94305, United States of America.

Journal of the American Chemical Society

|January 24, 2025

概括

微量铁杂质对乙醇氧化的催化剂的影响很小,但大量铁会显著抑制它. 乙醇氧化和氧化进化可能发生在催化剂的不同活性位点.

科学领域:

电化学
材料科学
催化剂

背景情况:

(Ni) 催化剂对于电化学反应至关重要,例如氧化演化反应 (OER) 和乙醇氧化反应 (EOR).
铁 (Fe) 融入对Ni催化剂性能的影响,特别是微量和散装Fe之间的区别,对于EOR仍然不清楚.

研究的目的:

调查微量与散装铁对乙醇氧化反应 (EOR) 的 Ni 基催化剂的影响.
阐明 Ni 催化剂上的 EOR 和氧化演化反应 (OER) 之间的关系.
澄清Fe杂质在EOR的Ni催化剂性能中的作用.

主要方法:

在基于Ni的薄膜上进行了广泛的循环电压测试.
使用电化学质谱 (EC-MS) 来监测反应产物和潜力.
催化电流抑制和法拉第效率的分析.

主要成果:

电解质杂质中的微量铁对EOR性能的影响很小.
在1.5V_RHE下,代码化散装Fe显著抑制了EOR催化电流的一半.
经过EC-MS检测,OER的发生与乙醇存在无关,这表明EOR和OER的活性点不同.
对Ni的OER观察到的低法拉第效率是时间依赖的.

结论:

基于Ni的材料在EOR中的催化性能对Fe的合并状态 (痕量与散装) 非常敏感.
在Ni催化剂上的不同活性点上进行EOR和OER.
了解Fe的结合对于设计有选择性和高效的Ni催化剂至关重要.

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