揭示了双功能PtLa电催化剂的机制,用于高效的甲醇氧化,进化和合反应
Yingliang Feng1, Sifan Zhang1, Mingzhi Chen1
1Jiangxi Province Key Laboratory of Functional Crystalline Materials Chemistry, College of Chemistry and Chemical Engineering, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiang Xi, China.
这项研究开发了用于清洁能源应用的化催化剂 (PtLa/C). Pt78La22/C催化剂在演变和甲醇氧化反应中表现出增强的性能和稳定性.
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 (Pt) 的催化剂对于燃料电池和生产等清洁能源技术至关重要.
- 在保持催化效率的同时减少的使用对于成本效益至关重要.
- 兰 (La) 兴奋剂被探索为一种提高Pt催化剂性能的策略.
研究的目的:
- 合成和描述具有不同Pt/La比率的新型PtLa/C催化剂.
- 在性条件下评估这些催化剂的电催化活性和稳定性,用于甲醇氧化反应 (MOR),演化反应 (HER) 和它们的合反应 (MOR
- 阐明以Pt为基础的催化剂的催化性质上的La兴奋的机制.
主要方法:
- 通过简单的化学还原方法合成PtLa/C催化剂 (Pt65La35/C,Pt78La22/C,Pt97La3/C).
- 在性介质下对MOR,HER和MOR的电催化性能测试.
- 使用X射线衍射 (XRD),X射线光电子光谱 (XPS),传输电子显微镜 (TEM),偏差校正扫描传输电子显微镜 (AC-STEM),现场里埃变换红外线 (FTIR) 和操作拉曼光谱的特征.
主要成果:
- 与商业Pt/C (153 mV) 相比,Pt78La22/C在较低的超电位 (111 mV在100 mA cm-2) 上显著提高了HER性能.
- 对于MOR,Pt78La22/C的质量活性是商业Pt/C的12.33倍,这归因于增强的CO键裂解和减少的CO吸附.
- Pt78La22/C显示了对合的MOR的极佳催化活性和稳定性,在1.030V时达到20mA cm-2,15小时后电压变化最小.
结论:
- 兰兴奋剂有效地增强了性介质中HER和MOR的Pt基催化剂的电催化活性和稳定性.
- 拉兴奋剂促进水的激活,减少了HER中毒的作用,同时促进了MOR中CO裂变.
- 开发的PtLa/C催化剂为高效,低成本的清洁能源应用提供了一个有前途的战略,特别是用于燃料电池和气发电.
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