在现场生物修饰Pt向甘油和酸电氧化:催化剂结构和表面微环境对活性和选择性的影响
Xiaomei Ning1, Liang Zhan1, Xiaosong Zhou1
1School of Chemistry and Chemical Engineering, Key Laboratory of Clean Energy Material Chemistry in Guangdong General University, Lingnan Normal University, Zhanjiang 524048, China.
Journal of colloid and interface science
|November 18, 2023
概括
将 (Bi3+) 添加到 (Pt) 催化剂中,可显著增强甘油和酸的电氧化反应. 这种修改提高了对二氧化碳中毒的抵抗力,并增强了催化活性,为更高效的能量转化铺平了道路.
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:
- (Pt) 催化剂对于电氧化反应至关重要,但遭受CO中毒.
- 甘油电氧化 (GOR) 和酸电氧化 (FAOR) 是能量转换的关键反应.
- 提高催化剂的稳定性和活性对于实际应用至关重要.
研究的目的:
- 调查现场 (Bi3+) 修饰对GOR和FAOR的Pt催化剂的影响.
- 阐明生物修饰Pt催化剂的动态结构和微环境.
- 建立Bi覆盖和催化性能之间的相关性,包括对CO中毒的抵抗力.
主要方法:
- 在现场用Bi3+进行Pt催化剂的电化学修饰.
- 电化学表征技术用于评估催化性能 (例如,循环电压测量,时测量).
- 密度函数理论 (DFT) 计算,以了解反应机制和表面相互作用.
主要成果:
- 双3+补充显著改善了GOR和FAOR在Pt催化剂上的性能.
- 在Bi覆盖率,耐CO中毒性和催化活性之间发现了强烈的相关性.
- 在Pt表面上形成Bi-shell与氧化物和Pt-Bi合体.
- 对GOR和FAOR的质量特异性和ECSA特异性活动的显著增加,具有最佳的Bi覆盖.
- 观察到FAOR中的增强脱和GOR中的4电子通路.
结论:
- 在现场的Bi修饰有效地提高了GOR和FAOR的Pt催化剂性能.
- 带正电荷的Bi和Pt-Bi合体可以改善负电荷中间体的吸附.
- 生物修饰表面的氧化物有助于氧化和去除有毒中间体,如二氧化碳.
- 优化的Bi覆盖带来了卓越的催化活性和CO耐受性,这对于燃料电池应用至关重要.
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