4.7 Article

Simultaneous electrodeposition of electrochemically reduced graphene oxide-binary metal chalcogenide composites to enhance photoelectrochemical performance

Journal

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 71, Pages 35290-35301

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.08.064

Keywords

Cadmium zinc sulfide; Cyclic voltammetry; Electrodeposition; Photoelectrochemical hydrogen production; Reduced graphene oxide

Funding

  1. Scientific and Technological Research Council of Turkey (TUBITAK) [219M328]
  2. Marmara University BAPKO [FDK-2020-10022]

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In this study, composite thin films of binary metal chalcogenides (CdxZn1-xS) and electrochemically reduced graphene oxide (RGO) were successfully fabricated via repetitive cyclic voltammetry. The incorporation of RGO enhanced the conductivity and prevented photocorrosion of the chalcogenides, leading to an increase in photocurrent density. The optimized composition of CdxZn1-xS and RGO composites showed significantly enhanced photoelectrochemical performance under solar light irradiation.
In this study, a facile and one-step simultaneous electrodeposition of the composite thin films bearing binary metal chalcogenides (CdxZn1-xS (x = 0.0, 0.2, 0.5, 0.8, 1.0)) and electrochemically reduced graphene oxide (RGO) was carried out via repetitive cyclic voltammetry (rCV). Then their photoelectrochemical (PEC) performances were investigated under the solar light irradiation to find out the optimized composition of the composites. Immobilization of Cd1-xZnxS nanoparticles among the RGO sheet with the rCV confined the Cd1-xZnxS nanoparticles between the RGO sheets, which prevented leakage of these particles from the electrode surface and contributed to the increase of active sites for the PEC reaction. PEC results showed that increasing x from 0 to 0.8 in CdxZn1-xS composition boosted the photocurrent density, reaching from 25 mA cm(-2) to 438 mA cm(-2). Incorporation of RGO to the structure increased the conductivity and prevented the photocorrosion of Cd0.8Zn0.2S, thus, RGO(0.25)-Cd0.8Zn0.2S enhanced the photocurrent density from 0.44 mA cm(-2) (as-synthesized Cd0.8Zn0.2S) to 1.38 mA cm(-2). (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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