Journal
APPLIED SURFACE SCIENCE
Volume 469, Issue -, Pages 276-282Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2018.11.054
Keywords
Photoelectrochemical (PEC); Water splitting; Photoanode; Heterojunction; P-N junction; Light absorption
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Funding
- National Key Research and Development Program of China, China [2016YFA0200400]
- Natural Science Foundation of China, China [51571100, 51602305, 51702116]
- Program for JLU Science and Technology Innovative Research Team, China (JLUSTIRT) [2017TD-09]
- Fundamental Research Funds for the Central Universities, China
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Photoelectrochemical (PEC) water splitting offers a promising route for producing chemical energy from abundant solar energy, but a bottleneck remains for PEC practical applications because of the lack of efficient, stable and earth-abundant photoelectrodes. Here, we report simultaneous improvements in carrier separation and light harvesting by constructing p-n heterojunctions in CuO/ZnO nanorod arrays. The novelty of this work is developing a new strategy for preparing a CuO/ZnO p-n heterojunction photoanode for PEC water splitting, in which Cu(OH)(2)/ZnO is first prepared by a chemical solution strategy and then transformed into CuO/ZnO by annealing. The CuO/ZnO heterojunction photoanode exhibited a significant negative shift of 150 mV for the onset potential and an approximately 4-fold enhancement in the photocurrent at 1.23 V vs reversible hydrogen electrode (RHE) compared with those of pristine ZnO NRs. This work offers a facile strategy for preparing oxide-based p-n heterojunction photoanodes for enhanced PEC water splitting.
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