Self-supported nickel-doped molybdenum carbide nanoflower clusters on carbon fiber paper for an efficient hydrogen evolution reaction

Abstract

Developing an efficient, stable and low-cost noble-metal-free electrocatalyst for the hydrogen evolution reaction (HER) is an effective way to alleviate the energy crisis. Herein, we report a simple and facile...

The effects of heteroatom substituents on structure, stability, and electronic properties of remote N‐heterocyclic germylenes (rNHGes), at DFT

“…Following previous reports on cyclic divalent species, [20][21][22][23][24][25][26][27][28] organic compounds and nanostructures, [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] now we compare and contrast new rNHGes (1-10) by fusion of one benzene, pyrrole, phosphole, furan and thiophene ring in "orthoor zigzag" arrangement and "paraor chair" arrangement to 1H-4-germapyridine-4-ylidene (1) as the reference germylene.…”

Metal (Mo, W, Ti) Carbide Catalysts: Synthesis and Application as Alternative Catalysts for Dry Reforming of Hydrocarbons—A Review

“…As a starting material for the preparation of molybdenum carbide using molten salt synthesis, MoO 3 has been used. Hu et al [150] described the method of preparation of molybdenum carbide doped with nickel supported on carbon fiber paper (CFP). For synthesis, CFP was impregnated with nickel ions.…”

Mo‐Vacancies Defect Engineering of One‐Dimensional Porous Mo2C Nanowires for Enhanced High‐Efficiency Hydrogen Evolution

“…Since the active β ‐phase Mo 2 C has been initially discovered in 2012, the research of Mo 2 C was increased rapidly although it‘s activity was not yet preeminent enough to unseat Pt‐based catalyst [12] . Further studies indicated that the excessively powerful Mo−H binding energy hindered the desorption of H ads to form hydrogen, which was the main factor effecting the catalytic performance of Mo 2 C. By doping the electron‐rich transition metals (such as Fe, Co, Ni and other elements in VIII group) to decrease the occupied d orbital of Mo, or building abundant defects on the surface can transform the surface charge density distribution of the catalyst, so as to optimize the intensity of the Mo−H bond, and then promote the electrocatalytic activity of Mo 2 C [13–19] . For example, Gao et al.…”

“…[10,11] Since the active β-phase Mo 2 C has been initially discovered in 2012, the research of Mo 2 C was increased rapidly although it's activity was not yet preeminent enough to unseat Pt-based catalyst. [12] Further studies indicated that the excessively powerful MoÀ H binding energy hindered the desorption of H ads to form hydrogen, which was the main factor effecting the catalytic performance of Mo 2 C. By doping the electron-rich transition metals (such as Fe, Co, Ni and other elements in VIII group) to decrease the occupied d orbital of Mo, or building abundant defects on the surface can transform the surface charge density distribution of the catalyst, so as to optimize the intensity of the MoÀ H bond, and then promote the electrocatalytic activity of Mo 2 C. [13][14][15][16][17][18][19] For example, Gao et al successfully doped Co in Mo 2 C nanowires, which significantly increased the electron density around the Fermi level in Mo 2 C and weakened the adverse effect of MoÀ H on HER kinetics, rendering the prepared Co-Mo 2 C was able to reach 10 mA cm À 2 at 140 mV. [20] Li and her co-worker employed SiO 2 as a hard template to synthesize β-Mo 2 C nanoparticles with rich Mo vacancies by dangerous hydrofluoric acid (HF) etching, which showed excellent HER activity.…”