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Two‐Step Hydrothermal Synthesis of CoSe/MoSe 2 as Hydrogen Evolution Electrocatalysts in Acid and Alkaline Electrolytes
Author(s) -
Song Wei,
Wang Kelei,
Jin Guanping,
Wang Zhongbing,
Li Chaoxiong,
Yang Xinming,
Chen Chunnian
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901382
Subject(s) - tafel equation , high resolution transmission electron microscopy , x ray photoelectron spectroscopy , materials science , chemical engineering , electrolyte , hydrothermal circulation , electrocatalyst , transmission electron microscopy , hydrogen , composite number , catalysis , nanotechnology , electrochemistry , chemistry , electrode , composite material , organic chemistry , engineering , biochemistry
Recently, composite electrocatalytic hydrogen evolution materials have received a lot of attention, especially the composite material of transition metal dichalcogenides. In this article, CoSe/MoSe 2 was successfully synthesized by a simple two‐step hydrothermal method, then the nanostructure and chemical composition of the composite was characterized by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and high‐resolution transmission electron microscopy (HRTEM). Compared to pure MoSe 2 and CoSe, CoSe/MoSe 2 exhibits excellent catalytic. The current density of 10 mA cm −2 could be reached at low overpotentials of 192 and 115 mV in acidic and alkaline electrolytes, respectively. In addition, such composite has a small Tafel slope and low electron transport resistance, which indicates that CoSe/MoSe 2 has a high hydrogen dissociation rate. Furthermore, it shows high cycling stability.