It is shown that by constructing multi‐GHJ, the PL intensity shows a decreasing trend, indicating that the multi‐GHJ can indeed suppress the recombination of photoinduced carriers.
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Multigraded Heterojunction Hole Extraction Layer of ZIF-Co <sub><i>x</i></sub> Zn<sub>1-<i>x</i></sub> on Co<sub>3</sub>O<sub>4</sub>/TiO<sub>2</sub> Skeleton for a New Photoanode Architecture in Water Oxidation.
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