β-Mo2C/MoO2 heterostructures for hydrogen evolution reaction: Morphology and catalytic activity regulated by heteroatom doping

Hierarchical MoO2/ZnIn2S4 Schottky Heterojunction Stimulated Photocatalytic H2 Evolution under Visible Light

“…Notably, this phenomenon might not result from MoO 2 exhibiting a strong response to light but was more likely ascribed to the electrocatalytic reaction because MoO 2 has been widely served as an efficient hydrogen evolution reaction (HER) electrocatalyst. 30,31 In short, the above analysis of photoelectrochemical investigations distinctly corroborates the sluggish recombination and effective transfer of photo-induced carriers at the interface of MoO 2 and ZnIn 2 S 4 , which are highly favorable for enhancing photocatalytic activity. Therefore, the transfer mechanism of charge carriers needs further verification.…”

“…It is worth noting that the I d of MoO 2 increased rapidly at a more negative voltage (∼ −0.4 V) no matter in the dark or light and finally exceeded that of ZnIn 2 S 4 . Notably, this phenomenon might not result from MoO 2 exhibiting a strong response to light but was more likely ascribed to the electrocatalytic reaction because MoO 2 has been widely served as an efficient hydrogen evolution reaction (HER) electrocatalyst. , …”

“…Molybdenum dioxide (MoO 2 ) is an emerging metallic oxide with favorable conductivity and chemical stability, which has been extensively used in Raman detection, sensing, electrocatalysts, − and photocatalysts. ,, Specifically, both experimental characterization and theoretical calculation results indicate that MoO 2 has an enormous Φ of 5–6 eV, which is comparable to some noble metals . Therefore, metallic MoO 2 has great prospects in the construction of the Schottky junction photocatalyst analogy to the reported metal–semiconductor.…”

Porous core–shell structured MoO2–Mo2C@C electrocatalysts for pH-universal hydrogen evolution reaction

“…2b) shows a pair of peaks located at 228.5 eV and 231.6 eV, which exhibit a spin energy separation of 3.1 eV, which can be ascribed to the characteristic doublet state (3d 5/2 and 3d 3/2 ) of Mo 2+ in β-Mo 2 C. 18 Additionally, another pair of peaks (229.2 eV and 232.6 eV) correspond to Mo 4+ of the MoO 2 phase, and the weak peak at 235.3 eV corresponds to Mo 6+ of the MoO 3 phase, which can be ascribed to partial surface oxidation of Mo 2 C in air. 21 In comparison with MMC-700, the Mo 3d peaks of MMC-650 shift slightly toward higher binding energy (about 0.2 eV) and the Mo 3d peaks of MMC-750 shift slightly toward lower binding energy (about 0.2 eV), indicating that the temperature during carbon coating had an impact on the valence of Mo at the catalyst surface. The high-resolution XPS spectrum of O 1s (Fig.…”

“…[16][17][18][19][20] To overcome these limitations, the design of core-shell structured catalysts has emerged as a promising strategy. 18,[21][22][23][24] The shell will protect the core and make the core more stable. In addition, the electronic structure of the core-shell structure can be hybridized to optimize the performance of the core-shell structure.…”