Journal
NANOTECHNOLOGY
Volume 27, Issue 30, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/30/305403
Keywords
photoelectrochemistry; p-Si/n-ZnO@Au heterostructures; 1D nanorod arrays
Funding
- National Natural Science Foundation of China [11574263, 11104240]
- Open Research Fund of State Key Laboratory of Bioelectronics of Southeast University [12015005]
- Personnel Training Plan of Yangzhou University
- Personnel Training Plan of Jiangsu Province
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Developing ingenious heterostructure photoelectrodes in photoelectrochemical (PEC) cells to both harvest more solar photons and steer desired charge separation flow is a prerequisite challenge for PEC water splitting. Herein a hierarchical p-Si/n-ZnO@Au heterostructure was constructed via large-area growth of one-dimensional (1D) ZnO nanorod arrays (NRAs) on p-Si substrate followed by decorating with Au nanoparticles (NPs), which exhibited remarkably improved photocathode activity for PEC water splitting relative to the bare Si and Si/ZnO NRAs photocathodes. In addition to structural superiorities of 1D NRAs, a series of dynamic contributions from complementary band-gap structure, p-n heterojunctions and Au plasmon towards photon harvesting and charge separation were demonstrated to ensure a well-steered collection of photoelectrons at the exposed ZnO nanorods and Au NPs, enabling substantially improved photocathode performance.
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