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Issue 14, 2020
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Z-scheme CdS/Co9S8-RGO for photocatalytic hydrogen production

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Abstract

Z-scheme photocatalytic systems, consisting of semiconductor/semiconductor heterostructures, mimic the natural photosynthesis and enhance the photocatalytic activity dramatically. Herein, we have for the first time synthesized unique all-solid-state Z-scheme ternary heterostructures by growing CdS nano-hemispheres radially assembled with nanorods as the core and CoS hexagonal nanoflakes as the shell on graphene sheets (CdS/Co9S8-RGO) through a facile one-pot hydrothermal method and subsequent annealing treatment. Furthermore, the growth mechanism is explored and analyzed by monitoring the intermediates in terms of structure and composition. The heterostructures form three paths available for charge carrier transfer and separation, wherein a redox-mediator-free Z-scheme constitutes CdS and Co9S8 and upgrades to an all-solid-state Z-scheme system by combination with RGO. Moreover, due to the excellent photon capture capability and electric conductivity, RGO also made great contribution to the effective separation and transfer of photogenerated carriers. Benefiting from efficient charge transfer and separation, CdS/Co9S8-RGO exhibits a H2 evolution rate up to 4.82 mmol h−1 g−1 and remarkable activity stability even after 20 h of photocatalytic reaction. We believe that the design philosophy via the plain synthesis merges multiple structural interfaces and transfer paths in a system reported here, shedding an insight into the design of other photocatalysts.

Graphical abstract: Z-scheme CdS/Co9S8-RGO for photocatalytic hydrogen production

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Supplementary files

Article information


Submitted
06 May 2020
Accepted
11 Jun 2020
First published
12 Jun 2020

Inorg. Chem. Front., 2020,7, 2692-2701
Article type
Research Article

Z-scheme CdS/Co9S8-RGO for photocatalytic hydrogen production

S. Kai, B. Xi, H. Li and S. Xiong, Inorg. Chem. Front., 2020, 7, 2692
DOI: 10.1039/D0QI00506A

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