Electrochemical synthesis of NieS/CeO2 composite electrodes for hydrogen evolution reaction

NieS/CeO2 electrodes have been prepared by a composite electrodeposition technique using nickel sulfaminate bath containing suspended microor nano-sized CeO2 particles. The composite electrodes exhibit a high activity for the hydrogen evolution reaction (HER) in alkaline solutions, most likely due to the synergistic effects between Ni and CeO2, as well as the increased surface area of the electrodes upon addition of CeO2 particles. It is found that the addition of CeO2 particles can lead to an increase of the sulphur content, resulting in more amorphous structures in the composite coatings. The NieS/microCeO2 composite electrode yields a higher HER activity than that measured with NieS/nano-CeO2 electrode, which is 2.2 times higher than that on the NieS coating. The relevant discussion was provided to elucidate the promotional roles of CeO2 particles in the composite electrodeposition process and corresponding HER activity. 2012 Published by Elsevier B.V.