Sulfur and molybdenum Co-doped graphitic carbon nitride as a superior water dissociation electrocatalyst for alkaline hydrogen evolution reaction

Heteroatom Doping of Molybdenum Carbide Boosts pH-Universal Hydrogen Evolution Reaction

“…33,34 In N 1s spectrum, the BEs loaded at 397.0 and 399.6 eV are attributed to Mo−N bonding and pyrrolic N, respectively, indicating that N has been successfully doped into Mo 2 C and rGO (Figure 2c). 35 The BE of Mo 2 F x C 1−x /rGO in F 1s at 684.7 eV exhibits ionic F−Mo bond, indicating the successful doping of F into Mo 2 C. 36 The signal of the F−C bond is not observed because F cannot be doped into graphene at 900 °C and below, with KF as a precursor of F, as mentioned in our previous report. 11 The XPS spectrum for Mo 2 B x C 1−x /rGO in B 1s shows the Mo−B bond at 188.0 eV and the B−C bond at 191.5 eV.…”

“…Mo 2+ is attributed to Mo 2 C, which is deemed as the active site for HER . BEs of Mo 2 N x C 1– x /rGO, Mo 2 F x C 1– x /rGO, Mo 2 B x C 1– x /rGO, Mo 2 S x C 1– x /rGO, and Mo 2 C/rGO at 226.9, 228.1, and 230.1 eV are attributed to Mo 2+ . , In N 1s spectrum, the BEs loaded at 397.0 and 399.6 eV are attributed to Mo–N bonding and pyrrolic N, respectively, indicating that N has been successfully doped into Mo 2 C and rGO (Figure c) . The BE of Mo 2 F x C 1– x /rGO in F 1s at 684.7 eV exhibits ionic F–Mo bond, indicating the successful doping of F into Mo 2 C .…”

Double functionalization of Mo 2 C and NiMn‐LDH assembling g‐C 3 N 4 as efficient bifunctional electrocatalysts for selective electrocatalytic reactions and overall water splitting

“…But by further calibrating for the molecular structure of the samples using Fourier transform infrared (FT-IR) spectrophotometry, the unique functional groups (C N/C═N and N C═N) assigned to g-C 3 N 4 at the wavenumber of 1200$1700 cm À1 and 807 cm À1 could be clearly observed in the samples (Figure S7), which confirmed the successful coating of g-C 3 N 4 . 47 As for other peaks of Mo 2 C@g-C 3 N 4 @NiMn-LDH in Figure S6, which corresponded to the JCPDS card No. 38-0815, showing different crystal planes of NiMn-LDH, and revealing the formation of Mo 2 C@g-C 3 N 4 @NiMn-LDH composites.…”

Transferable Active Centers of Strongly Coupled MoS2@Sulfur and Molybdenum Co-doped g-C3N4 Heterostructure Electrocatalysts for Boosting Hydrogen Evolution Reaction in Both Acidic and Alkaline Media

“…The synthesis mechanism and microstructure of the MoS 2 @Mo-S-C 3 N 4 electrocatalyst have been schematically illustrated in Figure a. The preparation of Mo-S-C 3 N 4 has been reported before, which was obtained by a two-step thermal condensation method . The Mo-S-C 3 N 4 matrix plays a significant part in the uniformly dispersed formation of MoS 2 laminate structure.…”

“…Non-metal-based layered graphite carbon nitride (g-C 3 N 4 ) materials have been extensively researched owing to their abundant N ligands as adjustable active sites. , In recent years, they have been used as a metal-free catalyst carrier in the field of photocatalysis, electrocatalytic water splitting, and catalytic reduction reaction. − However, due to their poor electrical conductivity, they have always been at a disadvantage in the electrocatalytic process. The sulfur and molybdenum co-doped g-C 3 N 4 (Mo-S-C 3 N 4 ) was prepared in the early stage, which effectively regulated its electronic structure and surface properties . In addition, it has been verified that the doped materials can accelerate the adsorption and dissociation of water, further becoming a promising electrocatalyst for hydrogen evolution under alkaline conditions.…”