N-Doped graphene-coated molybdenum carbide nanoparticles as highly efficient electrocatalysts for the hydrogen evolution reaction

Abstract

New N-doped graphene-coated molybdenum carbide nanoparticles are prepared, which exhibit superior electrocatalytic activity and long-term durability for the hydrogen evolution reaction.

Fine Tuning Electronic Structure of Catalysts through Atomic Engineering for Enhanced Hydrogen Evolution

“…As shown in Figure 2A, the XPS spectrum of N@Mo 2 C-3 indicated the presence of Mo, C, and N elements. [44][45][46][47] The peaks at 231.3 and 228.1 eV are attributed to MoC bond from Mo 2 C. [21,49] The peaks located at higher binding energy correspond to Mo 6+ (235.5 and 232.5 eV) and Mo 4+ (233.0 and 229.9 eV), which can be assigned to MoO 3 and MoO 2 possibly from the surface oxidation of Mo species, which is commonly present in the other Mo catalysts. The peaks located at 232.0 and 228.7 eV verify the formation of MoN species.…”

“…[36] However, further, it was demonstrated that the intrinsic HER activity of Mo 2 C is usually limited by their large density of empty d-orbitals on the Mo, which restricts the desorption of adsorbed H (H ads ) to generate H 2 . [43] However, nitrogen-doping (N-doping) often intermixes into carbon matrix rather than intercalating into Mo 2 C active sites, [16,[44][45][46][47][48] and thus how to construct a controllable N-doping into Mo 2 C activation site still remains a great challenge. [43] However, nitrogen-doping (N-doping) often intermixes into carbon matrix rather than intercalating into Mo 2 C active sites, [16,[44][45][46][47][48] and thus how to construct a controllable N-doping into Mo 2 C activation site still remains a great challenge.…”

“…Our previous works have shown that the organoimido-derivatized hexamolybdates [Mo 6 O 19 ] 2− (Mo6, a typical Lindqvist-type POM) can be easily acquired by applying various N-containing arylamine ligands to replace oxo sites in Mo6 clusters, which reconcile the quantitative amount of MoN bonds. Although the Keggin-type POMs cluster, [PMo 12 O 40 ] 3− , and their MOFs composites, have been reported to serve as precursors for Mo 2 C electrocatalysts, [21,40,46] such a ligand-controlled atomic engineering strategy via the design of various covalently organoimido-functionalized POMs structure frameworks has not yet been reported. [57] Herein, we propose that the amount of nitrogen incorporations into Mo 2 C structure could be well controlled by using various organoimido-derivatized POMs with inherent MoN bonds as precursors (Scheme 1).…”

A Co2P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction

“…[53][54][55][56] POMs can not only give rise to an assembly of catalytically active metal and nonmetal elements into one nanoscale cluster,b ut they can also be easily dispersed in variousc arbon sourceso wing to their high negative charge, whichi sb eneficial for uniform carbonization, phosphorization,o rn itrogenization in confined spaces. [53][54][55][56] POMs can not only give rise to an assembly of catalytically active metal and nonmetal elements into one nanoscale cluster,b ut they can also be easily dispersed in variousc arbon sourceso wing to their high negative charge, whichi sb eneficial for uniform carbonization, phosphorization,o rn itrogenization in confined spaces.…”

The Mechanistic Details for the Growth of Palladium Nanoparticles on Graphene Oxide Support

“…In this approach, the structural support is impregnated with soluble salts of target metals, and then annealed in inert atmosphere. This strategy was successfully employed for making NPs of Fe, Mo, Co, Ni, Pt, Pd and their hybrids on several structural supports including carbon based materials.…”