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高合金可实现多路径电子协同作用和晶格氧激活,以增强氧气进化活动

Tao Zhang^1,2,3, Hui-Feng Zhao¹, Zheng-Jie Chen³

¹Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.

Nature communications

|April 8, 2025

概括

高合金 (HEAs) 通过激活晶格氧来提高氧演化反应 (OER) 活性. 这种新的方法通过协同的电子转移增强了的氧化,从而导致更高效的能源技术.

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:

电催化氧演化反应 (OER) 对能源技术至关重要,但由于活性较低而受到限制.
激活晶格氧 (LOM) 可以增强OER,但面临着需要稳定的高价值金属离子的热力学挑战.

研究的目的:

研究用于激活LOM机制的高合金 (HEAs).
了解HEAs中的协同电子转移效应,以提高OER.
设计和评估一种新的HEA催化剂,以提高开放式资源表现.

主要方法:

在HEA中研究了协同的多路径电子转移.
分析了氧化增强和CoO键集成.
设计并测试了一个NiFeCoCrW_0.2HEA催化剂.

主要成果:

NiFeCoCrW_0.2HEA通过协同电子转移证明了增强的LOM激活.
催化剂在10 mA cm-2时达到220 mV的超电位.
HEA表现出极好的稳定性,在90天内在100mA cm-2下<5%的潜在变化.

结论:

高温电源可以通过协同电子转移有效地激活LOM,克服热力学限制.
在HEA的Ni-Co双站点在实现有效的LOM方面发挥着至关重要的作用.
这项研究推动了使用HEAs的高性能OER电催化剂的开发.

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