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We report on a cobalt sulphide (CoS) electrode prepared by simple and scalable chemical bath deposition (CBD), which performs as a highly efficient and robust electrocatalyst for the H2 evolution reaction (HER) in both neutral and pH 13 electrolyte solution at a small overpotential (η 95% for at least 72 h) and turnover numbers of approximately 2600 and 3400 in neutral and basic electrolyte solution, respectively. The rate of HER per geometric area is further enhanced by employing a CoS microtube array (microCoS), which is prepared by sulphurisation of a cobalt hydroxide carbonate nanorod array template using CBD. MicroCoS shows excellent HER activity when it is coupled with a cadmium sulphide sensitised zinc oxide photoanode in the presence of sodium sulphide and a nanostructured hematite (α-Fe2O3) photoanode from photoelectrochemical water splitting in basic electrolyte solution.

Cobalt sulphide microtube array as cathode in photoelectrochemical water splitting with photoanodes