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鲁尼合金的电子结构工程解密和基活性站点的分离和增强,以实现高效的性进化

Wei Lian¹, Feng Chen¹, Jie Wu¹

¹Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073, China.

Small (Weinheim an der Bergstrasse, Germany)

|November 4, 2024

概括

设计具有弱化活性位体竞争和毒性的- (RuNi) 合金可以提高演化反应 (HER) 的效率. DFT模拟和实验验证表明,Ni合金中的Ru剂提高了HER催化过程的稳定性和性能.

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:

在含合金中实现高效和稳定的演化反应 (HER) 是由于活性位点的竞争和毒性而受到挑战.
为克服这些挑战,对水解解离中间体的活性位点的合理设计至关重要.

研究的目的:

研究RuNi合金中活性位点分离和强化的机制,以改善HER.
为高效性HER电极提供新的设计策略.

主要方法:

用密度函数理论 (DFT) 模拟来分析RuNi合金中的电子转移和结合能.
实验验证涉及Ru-doped Ni合金 (aRu$_{x}$Ni) 的电沉积和电化学表征.

主要成果:

DFT模拟预测了RuNi合金中的活性点竞争和毒性减弱,原因是d频段电子从Ru转移到Ni,导致H*吸附的Gibbs自由能量为-0.12 eV.
实验结果证实,aRu$_{0.250}$Ni具有优异的HER特性,具有低超电位 (38 mV在-10 mA cm$^{-2}$) 和高稳定性.
使用aRu$_{0.250}$ Ni//bRu$_{0}$ 的双电极系统证明了超低电池电压 (1.86 V @ 500 mA cm$^{-2}$) 和显著的稳定性 (24 h @ 300 mA cm$^{-2}$).

结论:

该研究阐明了RuNi合金中活性位点分离和强化背后的机制.
这些发现为设计高效的性HER电极提供了一种新的方法,通过战略性的Ru兴奋剂.

关键词:

合金纳米粒子的合金.竞争性的吸附竞争.电子结构电子结构的生产生产的生产.

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