揭示了多金属纳米板内的有序相的生长机制
Azhar Mahmood1,2, Dequan He1, Chuhao Liu3
1Center for Advanced Analytical Science, Guangzhou Key Laboratory of Sensing Materials and Devices, Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials and Devices, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 1, 2024
概括
研究人员揭开了形成有序相四金属纳米板 (NPL) 的机制,揭示了创建先进电催化剂的新途径. 这些新型纳米板在氧和进化反应中表现出卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 电化学 电化学 电化学
背景情况:
- 合金纳米晶体 (NCs) 的调晶相是提高电催化性能的一个关键策略.
- 在合金NC形成中,异金属的扩散和排序机制仍然不太清楚.
研究的目的:
- 阐明四金属有序相纳米板 (NPL) 形成背后的机制.
- 调查这些新型NPLs的氧化演化反应 (OER) 和演化反应 (HER) 的电催化性能.
主要方法:
- 通过结晶性变化和再入槽观察金属间有序相的核和传播.
- 四金属PdCuIrCo NPLs的合成.
- 在酸性介质中对OER和HER进行电催化性能测试.
主要成果:
- 顺序相通过种子结晶性变化核化,并通过重新进入沟传播,作为中间NC.
- 与商业催化剂相比,PdCuIrCo NPL 显示出明显增强的 OER 和 HER 性能.
- 对于OER,PdCuIrCo/C的质量活性比Ir/C和Pd/C高约10倍,对于HER的质量活性比Ir/C和Pd/C高3倍.
结论:
- 已经确定了一种新型的有序相NC形成机制,涉及重新进入槽.
- 金属间有序结构,高价值Ir位点和拉伸应变有助于优越的电催化活性.
- 该策略为设计各种异质催化应用的有序相NPL提供了一种多功能方法.
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