一种金属化聚合物调节Pt纳米颗粒的电子结构,以加速水解离动力学
Xiaomei Hu1, Weixue Tao1, Wenjie Shi1,2
1Institute for New Energy Materials & Low Carbon Technologies, School of Material Science & Engineering, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China. wjshi@email.tjut.edu.cn.
Chemical communications (Cambridge, England)
|June 16, 2023
概括
这项研究开发了一种新的Pt-NPs@NPCNs-Co催化剂,以提高演化反应 (HER) 的性能. 与商业类催化剂相比,双金属催化剂在性介质中显示出更高的效率.
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
- 纳米技术 纳米技术
背景情况:
- 开发用于演化反应 (HER) 的高效电催化剂对于清洁能源技术至关重要.
- 现有的催化剂通常在活性,稳定性或成本方面面临限制,特别是在性介质中.
研究的目的:
- 为了构建一种新的复合材料,Pt-NPs@NPCNs-Co,用于增强水解离和HER.
- 为了研究纳米粒子 (Pt NPs) 和 (Co) 的协同效应,在配合的碳纳米管框架中.
主要方法:
- 通过将 Pt NPs 和 Co-salen 共价有机聚合物 (Co-COP) 固定在 N,P 共碳纳米管 (NPCN) 上,合成一种复合材料.
- 电化学表征以评估 HER 的性能,包括超电位和质量活动.
- 密度函数理论 (DFT) 计算以阐明催化机制和电子结构修改.
主要成果:
- Pt-NPs@NPCNs-Co催化剂表现出了特殊的HER性能,在效率方面超过了商业的Pt/C.
- 在40 mA cm-2的超电位低于20%的Pt/C.
- 开发的催化剂的质量活性是50mV超电位的商业Pt/C的2.8倍.
- DFT的计算证实,Co调节了Pt NP的电子结构,降低了Volmer阶段的激活能量.
结论:
- Pt NPs和Co之间的协同相互作用是增强电催化活性的关键.
- 开发的双金属共催化电催化剂为性介质中高效的HER提供了一个有希望的途径.
- 这项工作促进了对设计高效的电催化剂的理解,用于水分应用.
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