多巴胺碳化涂层PtCo催化剂具有提高耐久性,用于氧降低反应
Ran Wang1, Yu Du1, Yuandong Yan1
1Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, No. 22 Hankou Road, Nanjing, Jiangsu 210093, P. R. China.
The journal of physical chemistry letters
|August 9, 2024
概括
在- (PtCo) 催化剂上涂上胺涂层的石墨烯,可以防止的出水,显著提高氧降解反应的催化剂稳定性,而不会牺牲活性.
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:
- - (PtCo) 合金是有前途的电催化剂,但由于反应过程中的泄漏,其稳定性不佳.
- 这种不稳定性限制了它们在电化学设备中的实际应用,需要制定提高耐用性的策略.
研究的目的:
- 开发一种稳定的PtCo催化剂,通过使用一种新的涂层方法防止的出.
- 为了研究涂层对催化剂活性,稳定性和氧降解反应的抗毒能力的影响.
主要方法:
- 多巴胺吸附和热碳化,在Pt0.8Co0.2纳米粒子上形成几层基合石墨烯 (NC) 涂层.
- 在性电解质中进行电化学测试,以评估氧降解反应 (ORR) 的活性和稳定性.
- 谱分析以确认涂层的结构和 Pt-N 粘合相互作用.
主要成果:
- 配合的石墨烯涂层有效地保护了Pt0.8Co0.2纳米粒子,防止了奥斯瓦尔德的成熟和的泄露.
- 在性介质中,Pt0.8Co0.2@NC催化剂保持了高ORR活性,半波潜力为0.81V.
- 观察到强大的Pt-N结合,有助于涂层密度和增强抗毒能力.
结论:
- 开发的基合石墨烯涂层显著提高了PtCo催化剂对漏的稳定性.
- 涂层保留了PtCo合金的内在ORR活性和四电子反应机制.
- 涂层中的协调不和碳原子作为氧降解反应的额外活性点.
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