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Updated: May 20, 2025
Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
Published on: May 2, 2014
Boosting photocatalytic oxygen reduction to hydrogen peroxide via chemisorbed oxygen activation on
Shuai Dou1, Yuming Dong1, Yaning Zhang1
1School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China.
Abstract:
Harnessing solar energy to produce hydrogen peroxide (H2O2) from water (H2O) and dioxygen (O2) via artificial photosynthesis is an attractive route. However, the production of H2O2 is significantly hindered by slow mass transfer, primarily due to the low solubility and diffusion coefficient of O2 in water, particularly when the oxygen reduction reaction (ORR) predominates. To tackle this challenge, we propose that the polydopamine-coated zinc oxide nanoparticle with oxygen vacancies (PDA@ZnO1-x) core-shell photocatalyst exhibits excellent oxygen adsorption capability and promotes the two-electron reduction of O2. In-situ Electron paramagnetic resonance (EPR) and O2-Temperature-programmed desorption (TPD) confirmed that the semiquinone radicals (SQ•) within the PDA shell effectively chemisorb oxygen. Notably, PDA@ZnO1-x exhibited a high H2O2 production rate of 3.40 mM/h under visible light and an apparent quantum efficiency of 44.1 % at 400 nm. This work presents a significant strategy for improving oxygen utilization to achieve efficient photocatalytic production of H2O2.
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