A Co–Mo₂N composite on a nitrogen-doped carbon matrix with hydrogen evolution activity comparable to that of Pt/C in alkaline media

Abstract

Co–Mo2N@NC exhibits comparable hydrogen evolution reaction activity with that of Pt/C because of the improvement of intrinsic activity and electrical conductivity.

“d‐Electron Complementation” Induced V‐Co Phosphide for Efficient Overall Water Splitting

“…For better understanding, the TOFs of V‐CoP are plotted together with those of the most advanced HER electrocatalysts. As shown in Figure 3d, the TOF of V‐CoP at η 100 (0.87 H 2 s −1 ) is significantly larger than Co‐Mo 2 N@NC (0.1116 H 2 s −1 ) and Mo‐Ni 3 N (0.083 H 2 s −1 ), [ 40,41 ] while shares the same level with Ni 5 P 4 (0.79 H 2 s −1 ) and can compare favorably with the noble‐metal‐contained Sr 2 RuO 4 (0.9 H 2 s −1 ), [ 42,43 ] which further demonstrates that V‐CoP possesses high intrinsic activity for HER.…”

Free-standing phosphorous-doped molybdenum nitride in 3D carbon nanosheet towards hydrogen evolution at all pH values

“…3 a). The two peaks at 228.7 and 231.6 eV ascribed to Mo 2 + , two weak peaks at 229.8 and 233.1 eV ascribed to Mo 4 + , and two peaks at 232.1 and 235.6 eV, ascribed to Mo 6 + [16] . The Mo 6 + and Mo 4 + , as explained by previous studies [46 , 47] , likely correspond to molybdenum oxides (e.g., MoO 2 and MoO 3 ) originated from the surface oxidation of molybdenum nitride upon exposure to air, while the Mo 2 + can be assigned to the Mo-N and Mo-P (Mo-C for P-Mo 2 C-CNR) bonds, which are considered as the active species for HER [11 , 12 , 4 8 , 4 9] .…”

“…The lattice fringe of 0.250 nm can be indexed to the (111) plane of Mo 2 N ( Fig. 2 e) [16] . The carbon matrix is undoubtedly originated from the successful carbonizahttps://engine.scichina.com/doi/10.1016/j.jechem.2020.03.016 tion of [CNC 2 phIm] moiety.…”

Melamine-assisted synthesis of ultrafine Mo2C/Mo2N@N-doped carbon nanofibers for enhanced alkaline hydrogen evolution reaction activity

“…2d) is resolved to four pairs of peaks. Except for three peaks corresponding to pyridinic N (398.5 eV), pyrrolic N (399.4 eV) and graphitic N (401.4 eV), the peak located at 397.5 eV can also be observed, corresponding to Mo-N species [41,42]. In terms of peak area, pyridinic N and pyrrolic N are the dominating types of doped N, which are beneficial to the electronic conduction and catalysis.…”

“…As shown in Fig. 2c, the Mo 3d spectrum can be deconvoluted into six doublets, corresponding to Mo-C (228.4/231.5 eV), Mo-N (229.1/232.1 eV), and Mo-O (233.3/235.8 eV) [38][39][40][41]. Compared with Mo-C, the Mo atom with Mo-N bond exhibits higher chemical valence states, which may show better catalytic activity, and the Mo-O bond can be ascribed to oxidation of the surface exposed to air.…”