Abstract
In this study, photoelectrochemical performance of reduced graphene oxide (RGO)-Cd x Zn 1-x S composites, which were synthesized through a novel two-steps thermal sulfurization process by using elemental sulfur, was reported. This is the first time that the two-step thermal sulfurization process with elemental sulfur for the preparation of photoanode based on RGO-Cd x Zn 1-x S. The electrodes exhibited high photostability and photocurrent response in the presence of visible light. The presence of RGO in Cd x Zn 1-x S as electron collector and transporter increased the photocurrents approximately 40%. Among the RGO-Cd x Zn 1-x S composites, RGO-CdS photoanode yielded an extremely high photocurrent density of 6.5 mAcm −2 with the rate of hydrogen production rate of 551.1 μ m o l h − 1 c m − 2 . This value of photocurrent density is almost 89% of its theoretical value. This is the maximum attained photocurrent density with superior stability in comparison with related literature. • CdZnS based photocatalysts were synthesized through thermal sulfurization method. • Photoelectrochemical activity of each photocatalyst has been tested. • ITO/RGO-CdS appeared to be the most active and stable photocatalyst. • ITO/RGO-CdS provides the highest photocurrent density of 6.5 mAcm −2 . • ABPE estimated as 2.67% at V bias = 0V (vs. Pt-electrode).
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