期刊
DALTON TRANSACTIONS
卷 50, 期 13, 页码 4593-4603出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt00336d
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The novel ZnO@CuO core-shell heterojunction photoanode modified with ZnFe-LDH cocatalyst showed enhanced light harvesting, charge separation, and surface oxidation reactions, resulting in a significantly higher photocurrent density compared to the pristine ZnO photoanode. This demonstrates the potential of using core-shell nanorod arrays coupled with ZnFe-LDH as effective and low-cost photoelectrodes.
In this study, we have designed and synthesized a novel ZnO@CuO core-shell heterojunction photoanode modified with cocatalyst ZnFe-layered double hydroxides (ZnFe-LDH). As expected, the deposition of CuO enhances light harvesting and shortens the diffusion distance for charge transfer. The ZnO@CuO heterojunction also enhances charge separation and suppresses recombination. Furthermore, modification with cocatalyst ZnFe-LDH facilitates photogenerated hole transport and accelerates the surface oxidation reaction kinetics. On account of the synergistic effect of the core-shell heterojunction in ZnO@CuO with cocatalyst ZnFe-LDH, this photoanode exhibits an optimal photocurrent density of 2.08 mA cm(-2) at 1.23 V vs. RHE, which is about 5.3 times that of the pristine ZnO photoanode. Therefore, the construction of ZnO@CuO core-shell nanorod arrays coupled with cocatalyst ZnFe-LDH provides an effective and novel route for designing low-cost and high-efficiency photoelectrodes.
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