Nearly hollow Ru–Cu–MoO2 octahedrons consisting of clusters and nanocrystals for high efficiency hydrogen evolution reaction,Journal of Materials Chemistry A

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Nearly hollow Ru–Cu–MoO2 octahedrons consisting of clusters and nanocrystals for high efficiency hydrogen evolution reaction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-06-06 , DOI: 10.1039/d2ta01699k
Qian Liu _{1,

2} , Chengtian Zhang ₁ , Pengyan Wang ₁ , Ding Chen ₁ , Manjie Xiao ₁ , Lei Chen ₁ , Suli Liu ₃ , Jun Yu _{1,

2} , Shichun Mu _{1,

2}

Affiliation

Regular hollow catalysts have aroused increasing attention in electrocatalysis owing to large surface area, many more active centers and fast mass transfer. Nevertheless, the structure regulation of regular hollow catalysts, especially octahedrons, is scarcely reported. Herein, by developing a facile strategy, we successfully integrate Ru clusters and Cu–MoO₂ nanocrystals into a fused nearly hollow Ru–Cu–MoO₂ octahedron encapsulated in carbon. Due to the synergic effect and the advantageous structure and composition, such a multiple-nanocomponent catalyst merely requires 22 and 48 mV overpotentials at a current density of 10 mA cm⁻² for the hydrogen evolution reaction (HER) in 1 M KOH and 0.5 M H₂SO₄ solutions, respectively. More importantly, in alkaline seawater, nearly hollow Ru–Cu–MoO₂ octahedrons also present remarkable HER activity (23 mV @ 10 mA cm⁻²), indicating potential applications in hydrogen production from seawater electrolysis. Furthermore, density functional theory (DFT) calculation results unveil that the excellent catalytic activity of Ru–Cu–MoO₂ is on account of its relatively low hydrogen adsorption Gibbs free energy (ΔG_H*) and water adsorption energy. The present work provides a new approach for designing advanced Ru-based catalysts for the HER and beyond.

中文翻译：

由簇和纳米晶体组成的近空心Ru-Cu-MoO2八面体用于高效析氢反应

常规空心催化剂由于表面积大、活性中心多、传质快等优点，在电催化领域引起了越来越多的关注。然而，规则中空催化剂，尤其是八面体的结构调控却鲜有报道。在此，通过开发一种简便的策略，我们成功地将 Ru 簇和 Cu-MoO ₂纳米晶体整合到一个融合的近空心的 Ru-Cu-MoO ₂八面体包裹在碳中。由于协同效应和有利的结构和组成，这种多纳米组分催化剂在 10 mA cm ^-2的电流密度下仅需要 22 和 48 mV 的过电势即可用于 1 M KOH 和 0.5 MH 中的析氢反应 (HER) ₂ SO ₄分别解决。更重要的是，在碱性海水中，几乎空心的Ru-Cu-MoO ₂八面体也表现出显着的HER活性（23 mV @ 10 mA cm ^-2），表明在海水电解制氢中的潜在应用。此外，密度泛函理论（DFT）计算结果表明，Ru-Cu-MoO ₂优异的催化活性是由于其相对较低的氢吸附吉布斯自由能（ΔGH * _）和水吸附能。目前的工作为设计用于 HER 及其他领域的先进 Ru 基催化剂提供了一种新方法。

更新日期：2022-06-06

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