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通过三相接口电子交换以优化 Pt 位点上的中间吸附,用于甲醇氧化

Runzhe Chen^1,2, Zichen Wang¹, Suhao Chen¹

¹College of Materials Science and Engineering, Fuzhou University, Fuzhou ,Fujian 350108, China.

Inorganic chemistry

|February 19, 2024

概括

构建一个三相接口的氧化,和配合的石墨烯增强了直接的甲醇燃料电池催化剂. 这种优化的结构提高了甲醇氧化反应期间的催化活性和耐毒性.

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
催化剂是一种催化剂.

背景情况:

基于的催化剂对于直接甲醇燃料电池 (DMFC) 是至关重要的.
在甲醇氧化反应 (MOR) 中的催化剂性能取决于中间吸附 (CO,OH).
优化电子结构和吸附能量是增强活性和抗毒性的关键.

研究的目的:

设计和合成一种具有改进电子结构和中间吸附性的新型催化剂.
调查三相接口结构在增强MOR催化中的作用.
评估新催化剂的催化活性和抗毒能力.

主要方法:

理论机制研究以指导催化剂设计.
使用氧化 (SnO2), (Pt) 和配合石墨烯 (NG) 构建一个三相接口.
对MOR的催化活性和抗毒性的电化学表征.

主要成果:

三相接口促进了电子交换,优化了Pt位点上的中间吸附.
抑制CO*吸附,而促进OH*吸附,减少催化剂中毒.
新的催化剂显著增强了质量活性 (1098 mA mg-1 Pt,3.23x商业Pt/C).
与商业Pt/C (0.83V初始,0.89V峰值) 相比,CO氧化发生在较低的电位 (0.51V初始,0.74V峰值).

结论:

构建的三相接口有效调节Pt活性位点,以实现高级MOR催化.
催化剂表现出卓越的活性和抗毒性质,对于DMFC应用至关重要.
这种方法为开发先进的燃料电池催化剂提供了一个有希望的战略.

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