Symmetry or asymmetry: which one is the platform of nitrogen vacancies for alkaline hydrogen evolution

Abstract

The conventional nitrogen vacancies with symmetric coordination of metal cations (i.e., M1-Nv-M1) serve a crucial role in tuning the local environment of the metal sites in metal nitrides and improving...

Nanotip-Induced Electric Field for Hydrogen Catalysis

“…In particular, the Tafel slope of RuCu SNSs/C is 13.6 mV dec −1 , sugggesting that the Tafel process is the rate-determining step (RDS) during HER. 38 Note that the overpotential of 14.0 mV at 10 mA cm −2 for RuCu SNSs was much lower than those of the reported catalysts (Figure 4d and Table S5). Moreover, the improved HER activity of RuCu SNSs was confirmed by its highest electrochemical surface area (ECSA) based on double-layer capacitance (C dl ) (Figures 4e and S25).…”

“…Besides, the superior HER kinetics of RuCu SNSs was further validated by its lower Tafel slope compared to those of the references (Figure b,c). In particular, the Tafel slope of RuCu SNSs/C is 13.6 mV dec –1 , sugggesting that the Tafel process is the rate-determining step (RDS) during HER . Note that the overpotential of 14.0 mV at 10 mA cm –2 for RuCu SNSs was much lower than those of the reported catalysts (Figure d and Table S5).…”

Realization of electron-deficient Ru sites via Co4N coupling for synergistically enhanced alkaline hydrogen evolution

“…1g), corresponding to the (111) plane of Co 4 N and the (101) plane of Ru, respectively. 38,39 Elemental mapping shows that the Ru, Co, and N elements are evenly distributed over Ru/Co 4 N (Fig. 1h).…”

Green and alcohol-free H2O2 generation paired with simultaneous contaminant treatment enabled by sulfur/cyano-modified g-C3N4 with efficient oxygen activation and proton adsorption

“…Defect engineering and element doping are common and effective strategies for the structural modification and performance enhancement of photocatalysts. 25,26 The introduction of surface defects like vacancies or functional groups can modulate the electronic structure of g-C 3 N 4 and suppress charge recombination, thus accelerating H 2 O 2 production. 27 For instance, Zheng's group attempted to fabricate carbon nitride with the co-existence of N vacancies and cyano group and further demonstrated the roles of dual defect sites over g-C 3 N 4 for H 2 O 2 production.…”