Wang Jie, Xia Han, Peng Zhen, Lv Cuncai, Jin Lihuang, Zhao Yaoxing, Huang Zhipeng, Zhang Chi
Department of Chemistry and Advanced Research Institute, China-Australia Joint Research Center for Functional Materials, Tongji University, Shanghai, 200092, P.R. China.
Functional Molecular Materials Research Centre, Scientific Research Academy, China-Australia Joint Research Center for Functional Materials, Jiangsu University, Zhenjiang, 212013, P.R. China.
ChemSusChem. 2016 Apr 21;9(8):855-62. doi: 10.1002/cssc.201501595. Epub 2016 Mar 10.
A facile method is developed for the synthesis of graphene porous foam (Gr PF) loaded with dispersed molybdenum carbide (Mo2 C) nanoparticles; the material exhibits effective catalytic activity in the hydrogen evolution reaction (HER). Mo2 C/Gr PF is synthesized by the carbonization of glucose and the carbothermal reduction of hexaammonium molybdate in a confined space defined by the intervals between sodium chloride nanoparticles. The synthesis in the confined space results in thin Gr PF (≈8 nm) loaded with aggregation-free small Mo2 C nanoparticles [(13±2) nm]. The overpotential required for a current density of 20 mA cm(-2) in the electrochemical hydrogen generation is as small as 199 mV in acidic solution and 380 mV in basic solution. The performance is superior to that of a Mo2 C/C composite and compares favorably to those reported for Mo2 C nanostructures. The Mo2 C/Gr PF affords stable water electrolysis in both acidic and basic solution and exhibits nearly 100 % faradaic efficiency. The prominent performance, long-term stability, and high faradic efficiency make Mo2 C/Gr PF a promising HER catalyst for practical hydrogen generation from water electrolysis.
开发了一种简便的方法来合成负载有分散碳化钼（Mo₂C）纳米颗粒的石墨烯多孔泡沫（Gr PF）；该材料在析氢反应（HER）中表现出有效的催化活性。Mo₂C/Gr PF是通过葡萄糖碳化和六钼酸铵在氯化钠纳米颗粒间隔所限定的受限空间内的碳热还原反应合成的。在受限空间内的合成产生了负载有无聚集的小Mo₂C纳米颗粒[（13±2）nm]的薄Gr PF（≈8 nm）。在电化学产氢中，电流密度为20 mA cm⁻²时所需的过电位在酸性溶液中低至199 mV，在碱性溶液中为380 mV。该性能优于Mo₂C/C复合材料，与报道的Mo₂C纳米结构的性能相当。Mo₂C/Gr PF在酸性和碱性溶液中都能实现稳定的水电解，并且表现出近100%的法拉第效率。卓越的性能、长期稳定性和高法拉第效率使Mo₂C/Gr PF成为一种有前途的用于通过水电解实际产氢的HER催化剂。
