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- W4307723788 abstract "The construction of a homojunction is an effective approach for addressing issues such as slow charge separation and charge-transfer kinetics in photoanodes. In the present work, we designed a gradient Si- and Ti-doped Fe2O3 homojunction photoanode to improve the photoelectrochemical (PEC) performance of a Ti-doped Fe2O3 photoanode. Ti-FeOOH nanocorals were synthesized using a hydrothermal process, and Si-FeOOH was grown on Ti-FeOOH nanocorals using a rapid and facile microwave-assisted (MW) technique. By varying the MW irradiation time, the thickness of the Si/Ti:Fe2O3 photoanode was adjusted, and an optimized 3-Si/Ti:Fe2O3 photoelectrode was achieved with a significantly enhanced photocurrent density (1.37 mA cm-2 at 1.23 V vs. RHE) and a cathodic shift of the onset potential (150 mV) compared with that of bare Ti-Fe2O3. This enhanced PEC performance can be ascribed to homojunction formation and Si gradient doping. The Si dopant increased the donor concentration and the formation of a homojunction improved the intrinsic built-in electric field, thereby promoting charge separation and charge transfer. Furthermore, the as-formed homojunction passivated the surface-trapping states, consequently improving the charge transfer efficiency (60% at 1.23 VRHE) at the photoanode/electrolyte interface. These findings could pave the way for the microwave-assisted fabrication of diverse efficient homojunction photoanodes for PEC water splitting applications." @default.
- W4307723788 created "2022-11-05" @default.
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- W4307723788 date "2023-02-01" @default.
- W4307723788 modified "2023-10-16" @default.
- W4307723788 title "Gradient Si- and Ti-doped Fe2O3 hierarchical homojunction photoanode for efficient solar water splitting: Effect of facile microwave-assisted growth of Si-FeOOH on Ti-FeOOH nanocorals" @default.
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- W4307723788 doi "https://doi.org/10.1016/j.jechem.2022.10.028" @default.
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