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Broader contextGreat efforts are being focused to search for viable electrocatalysts for the water oxidation reaction (WOR) and the hydrogen evolution reaction (HER) which are preferably composed of only earth-abundant-elements. We report herein two novel ternary suldes, cobalt/nickel-tungsten-suldes, as attractive alternatives to platinum electrocatalysts for the HER. These suldes are easily electrodeposited on conducting electrodes from an aqueous solution of readily available precursors. Implementation of these HER electrocatalysts within a water (photo)electrolysis device is feasible and promising.

Photocorrosion, that causes rapid deactivation of Cu(2)O photocatalysts, was addressed by incorporating this oxide in a composite with reduced graphene oxide which acts as an electron acceptor to extract photogenerated electrons from Cu(2)O. Cu(2)O-rGO composite engineering also allows enhancing significantly photocatalytic activities of Cu(2)O for H(2) generation.