Xing Ji, Zhenzhen Wang, Zefeng Fang, Zhongzhe Wei, Jing Wang
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引用次数: 0
摘要
了解 Ru 和 Co 成分之间的相互作用以及合金比例对催化过程的影响是一项技术挑战，需要精确的合金结构设计。本研究提出了一种有效的分步退火法，用于构建不同 Ru:Co 比例的 RuCo 合金基电催化剂。有趣的是，随着第一步热解产物中 Co 浓度的增加，二次热解产生的 RuCo 复合材料经历了从不完全合金化到合金比为 1:1、1:2 和 1:8 的转变。当合金比例为 1:1 时，更多的 Run+ 和 Co0 转变为 Ru0 和 Co2/3+。在 1 M KOH 中，RuCo-0.6/NC 表现出卓越的催化性能和耐久性，甚至优于商用 Pt/C，在 10 mA cm-2 时的过电位更低，仅为 16 mV。DFT 计算表明，快速的 H2O 解离和适度的 H 吸附保证了 RuCo 的卓越活性。
Unlocking the Effects of the RuCo Alloy Ratio on Alkaline Hydrogen Production
Understanding the interaction between Ru and Co components and the alloy ratio effects on the catalytic process is a technical challenge that requires a precise alloy structural design. This study proposes an effective stepwise annealing method for the construction of RuCo alloy-based electrocatalysts with varied Ru:Co ratios. Interestingly, as the concentration of Co in the first-step pyrolysis products increases, the secondary pyrolysis results in RuCo composites undergoing a transition from incomplete alloying to alloy ratios of 1:1, 1:2, and 1:8. When the alloy ratio is 1:1, more Run+ and Co0 transform into Ru0 and Co2/3+. In 1 M KOH, RuCo-0.6/NC demonstrates outstanding catalytic performance and durability even superior to that of commercial Pt/C, delivering a lower overpotential of 16 mV at 10 mA cm–2. DFT calculations reveal that the fast H2O dissociation and moderate H adsorption guarantee the superior activity of RuCo.
期刊介绍：
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