Abstract
VS2−x (V2+, V4+) and VS2 (V4+) are prepared to investigate the effect of valence states of vanadium on the catalytic activity. The adsorption of N2 molecules is exothermic on the V4+ site, but endothermic on the V2+ site. The spontaneous formation of *N2 at V4+ substantially boosts the ENRR.
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