通过连接物协调和随后的聚合物阻断金属纳米集群的增长:作为坚固的进化电催化剂的纳米集群的案例
Xiaohong Wang1, DongXu Li1, Juguo Dai1,2
1College of Materials, Fujian Provincial Key Laboratory of Fire Retardant Materials, Xiamen Key Laboratory of Fire Retardant Materials, Xiamen University, Xiamen, 361005, China.
Small (Weinheim an der Bergstrasse, Germany)
|December 27, 2023
概括
高活性和稳定的纳米集群 (Ru/NSC) 已开发用于进化. 这种新的方法可以防止聚合,提高酸性和性溶液中的电催化剂性能.
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:
- 金属纳米集群为催化提供了很大的表面积,但由于生长和聚合,其稳定性不佳.
- 开发稳定和高度活跃的电催化剂对于进化反应 (HER) 是至关重要的.
研究的目的:
- 在和硫共碳矩阵上设计稳定,高度活跃的纳米集群 (Ru/NSC),以实现高效的进化.
- 研究防止纳米集群聚合和增强催化耐用性的方法.
主要方法:
- 合成Ru纳米集团与4'-(4-氨基) -2,2:6',2''-二 (TPY-NH2) 配合体协调,然后通过希夫基和热解进行聚合.
- Ru/NSC材料的表征,包括平均纳米集群大小 (1.55 nm).
- 在性和酸性电解质中进行电化学评估,包括性能指标和耐用性测试.
- 密度函数理论 (DFT) 计算以了解催化机制.
主要成果:
- 在一个N,S共碳矩阵 (Ru/NSC) 上实现了高度分散的超细Ru纳米集群 (平均尺寸为1.55nm).
- 优化的Ru/NSC表现出极小的超电位,高的周转频率,在性和酸性介质中都具有强大的耐用性.
- 证明了卓越的质量活性 (3.85 A mg-1 Ru在50 mV),显著优于商业Pt/C催化剂.
- DFT计算显示,Ru/NSC中的低d频段中心可促进*H中间溶解,增强性HER活性.
结论:
- 这项工作提出了一个可行的策略,用于在碳支上使用过渡金属纳米集群创建稳定,具有成本效益的电催化剂.
- 开发的Ru/NSC材料显示出对先进的能源技术,特别是生产的重大前景.
- 稳定策略有效地阻断金属离子扩散,防止纳米集群的生长和聚合.
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