Porous CoS2 nanostructures based on ZIF-9 supported on reduced graphene oxide: Favourable electrocatalysis for hydrogen evolution reaction

• DOI: 10.1016/j.ijhydene.2017.01.186
• Publication Date: 2017-03-01T19:30:52Z
• Authors: Yuanyuan Yang; Feng Li; Wenzhu Li; Wenbing Gao; He Wen; Jing Li; Yiping Hu; Yutong Luo; Rong Li
• Keywords: Overpotential; Imidazolate

Abstract The research and developments of porous, highly active non-noble metal cathode materials are the current hot spots. In our work, ZIF-9 (Zeolitic imidazolate framework-9) as a cobalt source provide porous structure, we have sulfurized the ZIF-9 into CoS 2 by a simple hydrothermal method. Ultimately, the porous CoS 2 /RGO cathode material was obtained. Through a series of characterization analyses (powder X-ray diffraction, X-ray photoelectron spectroscopy), it is confirmed that the CoS 2 /RGO composite was successfully formed. Furthermore, electrochemical tests demonstrated that the pursued catalyst exhibited remarkable hydrogen evolution reaction (HER) activities with a favorable overpotential (only 180 mV for 10 mA cm −2 vs reversible hydrogen electrode), a low Tafel slopes (75 mV decade −1 ) and high stability in acidic condition (more than 18 h).