Electrochemical activation-induced Co–Ni–Mo–O nanosheets with low crystallinity and abundant active sites for efficient and ultra-stable hydrogen generation,Dalton Transactions

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Electrochemical activation-induced Co–Ni–Mo–O nanosheets with low crystallinity and abundant active sites for efficient and ultra-stable hydrogen generation
Dalton Transactions ( IF 3.5 ) Pub Date : 2023-06-03 , DOI: 10.1039/d3dt01146a
Kailu Guo ₁ , Jinzhi Jia ₂ , Haixia Wu ₁

Affiliation

Co/Ni/Mo-based oxides are promising candidates for the hydrogen evolution reaction (HER). However, these electrocatalysts often exhibit unsatisfactory HER performance due to the lack of active sites. Herein, an in situ electrochemical activation strategy is proposed to modify the surface structure of a Co–Ni–Mo–O catalyst. During the HER in an alkaline electrolyte, the Co–Ni–Mo–O nanosheets display an activation period and a rough layer with low crystallinity is then formed on the surface of Co–Ni–Mo–O nanosheets with the leaching of partial Mo species. Owing to the synergistic catalysis of multiple metal components, a large electrochemically active surface area provided by the rough surface, and fully exposed active sites in the low-crystalline structure, the activated Co–Ni–Mo–O/NF shows favorable HER activity with an overpotential of only 42 mV at −10 mA cm⁻². Furthermore, it remains stable at a large current density of −250 mA cm⁻² for more than 400 h, outperforming almost all the oxide-based electrocatalysts. Such an electrochemical reduction activation strategy provides a feasible way for the surface modification and targeted design of advanced catalysts.

中文翻译：

电化学活化诱导的Co-Ni-Mo-O纳米片具有低结晶度和丰富的活性位点，可实现高效、超稳定的产氢

Co/Ni/Mo 基氧化物是析氢反应 (HER) 的有希望的候选者。然而，由于缺乏活性位点，这些电催化剂往往表现出不令人满意的HER性能。在此，就地提出了电化学活化策略来修饰 Co-Ni-Mo-O 催化剂的表面结构。在碱性电解液中析氢期间，Co-Ni-Mo-O 纳米片表现出活化期，然后随着部分 Mo 物质的浸出，在 Co-Ni-Mo-O 纳米片表面形成低结晶度的粗糙层。。由于多种金属组分的协同催化作用、粗糙表面提供的大电化学活性表面积以及低晶结构中充分暴露的活性位点，活化的Co-Ni-Mo-O/NF表现出良好的HER活性-10 mA cm ^-2时的过电势仅为 42 mV 。^{此外，它在-250 mA cm -2}的大电流密度下保持稳定超过400小时，优于几乎所有氧化物基电催化剂。这种电化学还原活化策略为先进催化剂的表面改性和靶向设计提供了可行的途径。

更新日期：2023-06-03

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