机器学习引导的单个原子促进了无贵金属水电解的氧化
Jaehyun Kim1, Ik Seon Kwon2, Jiheon Lim1,3
1Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, Republic of Korea.
Nature communications
|January 29, 2026
概括
在NiFe氧化中原子分散的 (W1-NiFeOOH) 显著降低了氧演化反应的超电位. 这种无贵金属的催化剂在水电解方面表现出高活性和稳定性,提供了可持续的能源解决方案.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 有效的水电解需要电催化剂来降低氧演化反应 (OER) 的过量的潜力.
- 贵金属催化剂是有效的,但稀缺,容易出水.
- 非贵金属替代品往往表现出有限的内在活性.
研究的目的:
- 为了确定一个具有成本效益的,无贵金属的OER催化剂.
- 探索NiFe氧化 (W1-NiFeOOH) 中的原子分散作为潜在的OER催化剂.
- 为催化剂设计开发一个集成的计算-实验工作流程.
主要方法:
- 利用基于等价变压器的机器学习原子间潜力来预测吸附能.
- 选了3,976个单原子结合金属氧化氧化物配置,以提名W1-NiFeOOH.
- 通过循环电沉积合成了W1-NiFeOOH,并使用现场光谱和密度函数理论 (DFT) 计算验证了其性能.
主要成果:
- 在2.0V时,W1-NiFeOOH实现了13.1A cm-2的高电流密度.
- 催化剂表现出了显著的稳定性,在性交换膜水电解中运行了500小时.
- 发现表面下W促进剂在Ni-O-Fe位点上诱导协同电子再分配,促进了去质子化步骤.
结论:
- 在NiFe氧化中原子分散的是一种高度活跃和稳定的无贵金属OER催化剂.
- 综合计算实验方法为设计可持续能源催化剂提供了有效的蓝图.
- 通过在活性位点修改电子结构,W促进剂增强了催化活性.
更多相关视频
04:09Predicting Treatment Response to Image-Guided Therapies Using Machine Learning: An Example for Trans-Arterial Treatment of Hepatocellular Carcinoma
Published on: October 10, 2018
8.8K
09:18Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
Published on: June 21, 2017
12.0K
相关概念视频
02:54Noble Gases
22.8K
The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
22.8K
03:00Electrolysis
30.5K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
30.5K
03:06Alkali Metals
24.6K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
24.6K
02:32Bonding in Metals
52.4K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
52.4K
03:08Atomic Radii and Effective Nuclear Charge
62.0K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
62.0K
02:37Metallic Solids
20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K