Transition metal chalcogenides are effective and economical electrocatalysts for the hydrogen evolution reaction in alkaline media, yet active sites and catalytic mechanisms remain unclear. Here the authors use operando spectroscopy to study the in-situ conversion of NiS to highly active Ni3S2/NiO dual-site catalysts for the alkaline hydrogen evolution reaction.
- Xingyu Ding
- Da Liu
- Kelvin H. L. Zhang