2022
DOI: 10.3866/pku.whxb202112037
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Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Abstract: Photocatalytic H2O2 production is a sustainable and inexpensive process that requires water and gaseous O2 as raw materials and sunlight as the energy source. However, the slow kinetics of current photocatalysts limits its practical application. ZnO is commonly used as a photocatalytic material in the solar-to-chemical conversion, owing to its high electron mobility, nontoxicity, and relatively low cost. The adsorption capacity of H2O2 on the ZnO surface is low, which leads to the continuous production of H2O2… Show more

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Cited by 82 publications
(45 citation statements)
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“…The S-scheme mechanism was illustrated by the charge transfer directions deduced from in situ irradiated X-ray spectroscopy (ISI-XPS) and enhanced redox abilities based on electron spin resonance (ESR) results. Later, the existence of S-scheme heterojunctions in ZnO/PDA and g-C 3 N 4 /PDA photocatalysts was also testified. , However, since the IEF within an S-scheme heterojunction is induced by charge redistribution, it is not constant and changes dynamically with the motion of electrons. In addition, the electron accepting and donating nature of PDA may further complicate electron activity, especially when it performs a charge–discharge process as an electron reservoir.…”
mentioning
confidence: 99%
“…The S-scheme mechanism was illustrated by the charge transfer directions deduced from in situ irradiated X-ray spectroscopy (ISI-XPS) and enhanced redox abilities based on electron spin resonance (ESR) results. Later, the existence of S-scheme heterojunctions in ZnO/PDA and g-C 3 N 4 /PDA photocatalysts was also testified. , However, since the IEF within an S-scheme heterojunction is induced by charge redistribution, it is not constant and changes dynamically with the motion of electrons. In addition, the electron accepting and donating nature of PDA may further complicate electron activity, especially when it performs a charge–discharge process as an electron reservoir.…”
mentioning
confidence: 99%
“…The ultraviolet−visible diffuse reflectance spectrum (DRS) was recorded to determine the energy band structure and light absorption capacities of as-synthesized samples (Figure S13a). 41 Apparently, the WP exhibits a broad and strong light absorption in comparison to that of the pristine TH. The energy gaps of the TH and WP are estimated to be 3.26 and 2.85 eV, respectively, via Tauc plots (Figure S13b).…”
Section: Resultsmentioning
confidence: 98%
“…[15,16] To address the above problems, considerable strategies such as interfacial engineering, cocatalyst modification, and semiconductor combination have been devoted to boost the H 2 O 2 production of BiVO 4 . [17][18][19][20][21] Among these strategies, cocatalyst modification is considered to be one of the most effective methods. [22][23][24] Given that O 2 reduction to H 2 O 2 is one of the key steps to determine photocatalytic performance of H 2 O 2 production, thus, exploiting a high-efficient electron cocatalyst is imperative for O 2 reduction to H 2 O 2 with the increasing selectivity and activity.…”
mentioning
confidence: 99%