期刊
CHEMICAL ENGINEERING JOURNAL
卷 435, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.134995
关键词
Femtosecond laser processing; Self-supported electrocatalyst; Hierarchical nanostructure; Hydrogen evolution reaction; Overall water splitting; Oxygen evolution reaction
资金
- National Key R&D Program of China [2018YFB1107200]
This study proposes a novel strategy for constructing self-supported cobalt oxide electrocatalysts with hierarchical nanostructures on a copper substrate using spatially shaped femtosecond laser ablation pretreatment. The self-supported electrocatalysts demonstrated favorable electrocatalytic properties in alkaline solutions, showcasing high activity and stability for water electrolysis.
The hierarchical nanostructure catalyst on the self-supported electrode with a rational and large-area distribution is essential for high-efficiency overall water splitting. Herein, a novel strategy based on spatially shaped femtosecond laser ablation pretreatment is proposed for constructing self-supported cobalt oxide electrocatalysts with hierarchical chestnut burr-like nanostructures on a copper substrate. The femtosecond laser ablation can create pinning and attachment sites for the growth of nanowires to form stable self-supported structures. Due to the hierarchical three-dimensional fluffy structures and tight adhesion between active materials and substrates, the prepared self-supported electrocatalysts can provide rapid charge transfer, a large surface area with ample active sites, accelerated electrolyte diffusion, effective catalytic components, and high conductivity during the electrocatalytic process. Naturally, the self-supported electrode demonstrated favorable electrocatalytic properties in alkaline solutions (1 M KOH), presenting low overpotentials of 105 and 235 mV at the current density of 10 mA cm(-2) during the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Moreover, the constructed electrolyzer system with the self-supported electrocatalysts can facilitate overall water splitting at the low cell voltage of 1.51 V to achieve a current density of 10 mA cm(-2) and exhibits durability for up to 72 h, indicating a high level of activity and stability for water electrolysis. This work presents a novel perspective for the construction of electrocatalysts structures with stable and efficient properties.
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