• 文献标题:   Nanocomposite Based on N,P-Doped Reduced Graphene Oxide, Mo2C, and Mo2N as Efficient Electrocatalyst for Hydrogen Evolution in a Wide pH Range
  • 文献类型:   Article
  • 作  者:   KURYS YI, MAZUR DO, KOSHECHKO VG, POKHODENKO VD
  • 作者关键词:   hydrogen evolution reaction her, carbonized nanocomposite electrocatalyst, mo2c, mo2n, poly5aminoindole, reduced graphene oxide
  • 出版物名称:   ELECTROCATALYSIS
  • ISSN:   1868-2529 EI 1868-5994
  • 通讯作者地址:  
  • 被引频次:   4
  • DOI:   10.1007/s12678-021-00667-6 EA APR 2021
  • 出版年:   2021

▎ 摘  要

It was shown that pyrolysis (900 degrees C, 3 h) of a precursor based on poly-5-aminoindole, 12-phosphomolybdic acid (PMo12), and reduced graphene oxide (rGO) leads to composite of N,P-doped rGO containing both Mo2C (predominantly) and Mo2N nanoparticles (Mo2C,Mo2N/N,P-rGO). The composition and structure of the obtained composite were studied by scanning and transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, and X-ray photoelectron spectroscopy. Due to the presence of various active sites in the carbonized composite (Mo2C, Mo2N, C/N-x, etc.) and their possible joint catalytic action (synergistic effect), Mo2C,Mo2N/N,P-rGO exhibits high electrocatalytic activity in the hydrogen evolution reaction (HER) in a wide pH range. The low Tafel slopes of 60 and 57 mV/dec and overpotential of 195 and 115 mV at 10 mA cm(-2) take place on Mo2C,Mo2N/N,P-rGO in 0.5 M H2SO4 and 1.0 M KOH, respectively. The electrocatalytic properties of Mo2C,Mo2N/N,P-rGO were compared with that of composites formed under the same conditions, but either using other molybdenum-containing Keggin acid-12-silicomolybdic acid, or with PMo12, but in the absence of rGO. It was found that significant differences in the chemical and phase composition of such composites, in comparison with Mo2C,Mo2N/N,P-rGO, determine their lower activity in HER in both acidic and alkaline electrolytes.