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黄金纳米集群在纳米集群/CoSe₂接口上促进电催化水氧化

Shuo Zhao¹, Renxi Jin¹, Hadi Abroshan¹

¹Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States.

Journal of the American Chemical Society

|January 10, 2017

概括

金纳米集群与脱化物相结合,可促进氧气演化反应 (OER),从而有效地产生气. 这种复合催化剂显示出增强的活动,并提供了对OER机制的洞察力.

科学领域:

材料科学
电化学
催化剂

背景情况:

电催化水分解对于可持续的生产至关重要.
氧进化反应 (OER) 是限制速度的步骤,需要改善催化剂.
了解开放式反应机制是设计高效催化剂的关键.

研究的目的:

通过使用金纳米集/二 (CoSe2) 复合物来提高氧化演化反应 (OER) 的性能.
研究电子相互作用在这些复合材料的催化活性中的作用.
为催化剂设计提供OER机制的原子层面见解.

主要方法:

金纳米集群/CoSe2复合物的合成.
在性溶液中的催化活性的电化学表征.
进行X射线光电子光谱 (XPS) 分析和密度功能理论 (DFT) 模拟.

主要成果:

与原始CoSe2相比,Au25/CoSe2复合物显著增强了OER活性.
复合材料的电流密度为10 mA cm-2在~0.43 V的超电位下实现.
发现连接物和黄金集群大小会影响催化性能.
金纳米集群和CoSe2之间的电子相互作用被确定为增强的来源.

结论:

金纳米集/CoSe2复合材料是氧化演化反应的有效电催化剂.
组件之间的电子相互作用促进了关键中间体的形成和产品的脱落.
这项研究为设计先进的OER催化剂提供了战略和机制理解.

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