A highly efficient alkaline HER Co–Mo bimetallic carbide catalyst with an optimized Mo d-orbital electronic state

Abstract

A Co–Mo bimetallic carbide catalyst with an optimized electronic state was fabricated and great alkaline HER performance was achieved.

Tuning the Activity of Molybdenum Carbide MXenes for CO2 Electroreduction by Embedding the Single Transition-Metal Atom

“…Similarly, Liu et al experimentally explored the effect of introducing metallic Co into β-Mo 2 C materials on the HER performance. Their results show that Co-doped β-Mo2C could promote the HER activity . Li et al.…”

“…One strategy to improve the catalytic activity of catalysts is to utilize the defect and interface engineering (e.g., vacancy, doping, and loading). ,, Recently, single-atom alloys catalysts based on MXenes substrates have been extensively studied as alternative catalysts for various catalytic reactions. ,, For example, Zhang et al synthesized the Mo 2 TiC 2 T x –Pt SA catalyst with the single-atom Pt dispersed on the Mo vacancy of Mo 2 TiC 2 T x nanosheets, and these alloy-catalysts exhibit high activity toward HER . Similarly, Liu et al experimentally explored the effect of introducing metallic Co into β-Mo 2 C materials on the HER performance.…”

“…Their results show that Co-doped β-Mo2C could promote the HER activity. 49 Li et al theoretically studied the electrocatalytic NRR performance of Mo 2 TiC 2 O 2 -TM SA MXenes embedded with single transition-metal atoms, and their results show that the doped MXenes can improve the NRR catalytic performance remarkably. 34 Despite these important contributions to MXenes, there are relatively few studies on the single-metal-doped MXenes for CO 2 ER.…”

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.…”