Journal
RENEWABLE ENERGY
Volume 153, Issue -, Pages 241-248Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.02.001
Keywords
Three-dimensional structure; Heterojunction; Photoelectrochemical; Morphology tuning
Funding
- Basic Research Program of Shaanxi Province Foundation [2018JQ5212]
- Fundamental Research Funds for the Central Universities [2452017166, 2452017168]
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Three-dimensional ZnO/CdS hierarchical films with uniform CdS deposition on the ZnO nanorods surface is prepared by a two-step hydrothermal method. The morphology of CdS nanostructure can be adjusted from particles to sheets and then blocks by changing amount of the surfactant in the precursor solution. The ZnO/CdS hierarchical film as photoelectrode with optimized morphology shows significant enhancement to the light harvesting and photoelectrochemical performance. Under light irradiation of 100 mW/cm(2), the three-dimensional ZnO/CdS hierarchical film yields a photocurrent density of 4.5 mA/cm(2), approximately two times higher than that of film without three-dimensional structure. The photoelectrochemical property improvement is attributed to the (1) enhanced light absorption due to the multi-scattering and multi-reflection of the unique three-dimensional hierarchical structure, (2) improved photogenerated carrier separation and transportation because of the hierarchical and heterojunction structure, and (3) facilitated hole transfer and reaction at the photoelectrode-electrolyte interface due to the large surface area. (C) 2020 Elsevier Ltd. All rights reserved.
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