Controllable Synthesis of a Loofah-Like Cobalt–Nickel Selenide Network as an Efficient Electrocatalyst for the Hydrogen Evolution Reaction

• Published in: ACS applied materials & interfaces Vol. 14; no. 7; pp. 8963 - 8973
• Main Authors: Liu, Yanxia, Tian, Zhangmin, Xu, Qiuchen, Yang, Yaxiong, Zheng, Yiteng, Pan, Hongge, Chen, Jian, Wang, Zhen, Zheng, Wenjun
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 23.02.2022
• Subjects: Energy, Environmental, and Catalysis Applications; electrocatalysts; ionic liquids; 3D hierarchical architectures; cobalt−nickel selenide; hydrogen evolution reaction
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.1c21422

The rational design and construction of noble metal-free electrocatalysts featuring high efficiency and low cost are important for the hydrogen evolution reaction (HER). A significant development in the synthesis of a loofah-like Co0.6Ni0.4Se2 architecture (expressed as Co0.6Ni0.4Se2-LN) electrocatalyst on carbon cloth through a three-step method is reported. Both the ionic liquid 1-dodecyl-3-methylimidazolium acetate (IL, [C12MIm]­Ac) and the molar ratio of Co to Ni play a pivotal role in the synthesis of Co0.6Ni0.4Se2-LN with 3D hierarchical architecture. Co0.6Ni0.4Se2-LN exposes abundant active sites and provides hierarchical and stable transfer channels for both electrolyte ions and electrons, which results in outstanding HER performance. Impressively, Co0.6Ni0.4Se2-LN shows a low overpotential of 163 mV at 10 mA cm–2, a small Tafel slope of 40 mV dec–1, and superior stability to continuously catalyze the generation of H2 for 40 h. This study offers a new perspective to the synthesis of high-efficiency inexpensive electrocatalysts for HER and also presents a good example for investigating the potential application of ILs in the synthesis of functional materials.