A non-noble metal MoS2–Cd0.5Zn0.5S photocatalyst with efficient activity for high H2 evolution under visible light irradiation

Abstract

Here we describe the synthesis and characteristics of MoS₂–Cd_0.5Zn_0.5S, an efficient non-noble metal photocatalyst of H₂ evolution from water under visible light irradiation. This new quaternary composite was successfully synthesized by using a two-step hydrothermal method. The formation of a uniform Cd_0.5Zn_0.5S solid solution through hydrothermal coprecipitation and the subsequent loading of a suitable amount of MoS₂ were essential to enhance the catalytic activity of the MoS₂–Cd_0.5Zn_0.5S photocatalyst, which exhibited a synergistic effect for H₂ evolution derived from splitting water. This photocatalyst exhibited good photostability and high photocatalytic activity, which was maintained even after being re-used three times. An H₂ evolution rate of 12.30 mmol h⁻¹ g⁻¹ was achieved under visible light irradiation from an aqueous solution of lactic acid, indicative of superior water-splitting activity for this noble metal-free photocatalyst.