期刊
RSC ADVANCES
卷 11, 期 22, 页码 13513-13520出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra00417d
关键词
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资金
- National Natural Science Foundation of China [21774114]
- National Key R&D Program of China [2017YFA0403403]
- CAS-TWAS President's Fellowship
The study introduces a novel photoanode with a tandem structure of ITO/WO3/Cu2O/CuO, which shows significant enhancement in solar energy conversion efficiency. The improvements are attributed to factors such as diverse light harvesting, accelerated charge separation, enhanced electrocatalytic activity, and the formation of a protective layer.
Photoanodes based on semiconductor WO3 have been attractive due to its good electron mobility, long hole-diffusion length, and suitable valence band potential for water oxidation. However, the semiconductor displays disadvantages including a relatively wide bandgap, poor charge separation and transfer, and quick electron-hole recombination at the interface with the electrolyte. Here we present a significantly improved photoanode with a tandem structure of ITO/WO3/Cu2O/CuO, which is prepared first by hydrothermally growing a layer of WO3 on the ITO surface, then by electrodepositing an additional layer of Cu2O, and finally by heat-treating in the air to form an exterior layer of CuO. Photocurrent measurements reveal that the prepared photoanode produces a maximum current density of 4.7 mA cm(-2), which is, in comparison, about 1.4 and 5.5 times the measured values for ITO/WO3/Cu2O and ITO/WO3 ones, respectively. These enhancements are attributed to (1) harvested UV, visible, and NIR light of the solar spectrum, (2) accelerated charge separation at the heterojunction between WO3 and Cu2O/CuO, (3) better electrocatalytic activity of formed CuxO than pure Cu2O, (4) formation of a protective layer of CuO. This study thus may lead to a promising way to make high-performance and low-cost photoanodes for solar energy harvesting.
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