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- W2910910244 abstract "Dual-absorber photoelectrodes have been proved to possess greater potential than the single-absorber systems in the applications of photoelectrochemical (PEC) cells (e.g., solar-driven water splitting); however, the mismatching of the energy bands and substantial carrier recombinations at the two absorber interfaces are normally subsistent. Here, we introduce an intermediate layer of conformal Al2O3 into the silicon/hematite (Si/α-Fe2O3) microwire photoanode for enriching the understanding of the interaction among the interlayer, inner absorber, and outer absorber. Our results show that the Si/Al2O3/α-Fe2O3 microwire photoanode with the thickness-optimized Al2O3 can lead to a substantial increase in the photocurrent from 0.83 to 2.08 mA/cm2 at 1.23 VRHE (under 1 sun irradiation) and an obvious decrease in the onset potential relative to the counterpart without Al2O3. By analyzing the PEC responses under various monochromatic lights, PEC impedance spectroscopy, and intensity-modulated photocurrent spectroscopy, we ascribe the improvements to the fact that the suitable-thickness Al2O3 can passivate the Si microwire surfaces and the bottom surfaces of the α-Fe2O3 film and give rise to Al doping into the post-synthesized α-Fe2O3. These essential causes promote the carrier separation in α-Fe2O3, diminish the photoanode surface recombination rate, and then increase the surface charge-transfer efficiency." @default.
- W2910910244 created "2019-01-25" @default.
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- W2910910244 date "2019-01-18" @default.
- W2910910244 modified "2023-10-13" @default.
- W2910910244 title "Regulating the Silicon/Hematite Microwire Photoanode by the Conformal Al<sub>2</sub>O<sub>3</sub> Intermediate Layer for Water Splitting" @default.
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- W2910910244 doi "https://doi.org/10.1021/acsami.8b18681" @default.
- W2910910244 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30657304" @default.
- W2910910244 hasPublicationYear "2019" @default.
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