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在Cr结合的Ni3和S2上进行现场激活诱导的表面重建,以增强性进化反应

Ruidi Li¹, Cong Chen¹, Junxia Shen¹

¹School of Physical Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China. cchen96@suda.edu.cn.

Physical chemistry chemical physics : PCCP

|May 6, 2025

概括

这项研究引入了一种新型的结合硫化 (Cr-Ni3S2) 催化剂,该催化剂通过现场表面重建来激活. 增强的催化剂表现出优越的演化反应 (HER) 性能和稳定性,为高效的 HER 催化提供了一条新的途径.

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:

硫化 (Ni3S2) 由于其导电性和合成方法,是演化反应 (HER) 的有前途的催化剂.
然而,HER的动力学受到高H2O解离能障碍和弱H*中间溶解的限制.
表面重建是提高催化剂性能的一种已知的策略,主要研究在氧气演化反应中.

研究的目的:

在Ni网基板 (Cr-Ni3S2/NM) 上开发一种新的Cr-纳入的Ni3S2催化剂,用于改进HER.
研究 in situ 激活和表面重建对催化剂结构和 HER 性能的影响.
通过理论计算阐明表面重建增强 HER 动力学的机制.

主要方法:

一个阶段的电极沉积合成Cr-Ni3S2/NM.
在现场激活以诱导表面重建,创建A-Cr-Ni3S2/NM.
电化学表征 (包括超电位和电流密度测量) 和理论计算.

主要成果:

激活的催化剂 (A-Cr-Ni3S2/NM) 呈现出丰富的Ni3S2/Cr2S3异质连接和增强的电荷/质量转移.
在现场激活导致了电子结构的改变,增加了氧物种和S空缺,促进了OH*和H*脱吸.
A-Cr-Ni3S2/NM 在 -10 mA cm-2 时实现了78 mV 的低超电位,并在 100 mA cm-2 时保持了 200 小时以上的稳定性.

结论:

在现场表面重建显著提高了Cr-Ni3S2催化剂的HER性能.
激活过程促进了电荷传输,并优化了中间吸附/脱附,以实现高效的水分裂.
这项研究表明了表面重建在HER催化中的关键作用,为高性能催化剂提供了可行的策略.

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