2D metal-organic frameworks-derived preparation of layered CuS@C as an efficient and stable electrocatalyst for hydrogen evolution reaction. (10th November 2019)

• Record Type: Journal Article
• Authors: Rong, Jian; Xu, Jinchao; Qiu, Fengxian; Fang, Yuanyuan; Zhang, Tao; Zhu, Yao
• Is Part Of: Electrochimica acta. Volume 323(2019)
• Publication Date: 2019-11-10
• Subjects: 2D metal-organic frameworks -- Sulfidation -- Copper sulfide -- Hydrogen evolution reaction -- Electrocatalyst; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.134856
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Given the energy crisis and environmental pollution, it is urgent to design and construct efficient and stable electrocatalyst for the production of clean hydrogen energy. In this work, 2D Cu-contained metal-organic frameworks (Cu-BDC nanosheets) were firstly synthesized using Cu2 O cubes as Cu 2+ source precursor by a facile and efficient bottom-up method. Subsequently, layered CuS@C were prepared via a sulfidation of Cu-BDC nanosheets as an efficient electrocatalyst for hydrogen evolution reaction (HER). The effects of catalyst structure and chemical composition on the electrocatalytic activity were discussed in detail. Experiment results shows that the optimized layered CuS@C exhibits high HER catalytic activity, affording the current density of 10 mA cm −2 at low overpotentials of 128 mV and Tafel slopes of 44 mV dec −1 . The enhanced HER electrocatalytic activity of layered CuS@C may be attributed to structural advantage of 2D Cu-BDC precursors, which endows derived electrocatalyst with high specific surface area and percentages of exposed active sites. Moreover, due to the protection of carbon matrix, as-obtained catalysts show high electrocatalytic stability in acidic, alkaline and neutral mediums, making it a potential candidate as electrodes for the application of production of clean hydrogen energy source. Graphical abstract: Image 1 Highlights: Cu-BDC nanosheets were synthesized by a bottom-up method. Layered CuS@C were prepared by a sulfidation of Cu-BDC nanosheets. The layered CuS@C afforded the current density of 10 mA cm −2 at low overpotentials of 128 mV for HER. This approach can be extended to prepare efficient catalysts based on 2D MOFs material.