Cascading Interfaces Enable n-Si Photoanodes for Efficient and Stable Solar Water Oxidation.
J Phys Chem Lett
; 10(9): 2278-2285, 2019 May 02.
Article
em En
| MEDLINE
| ID: mdl-31002523
ABSTRACT
Interfaces with multifunctions for promoted solid/solid interfacial charge-transfer dynamics and accelerated solid/electrolyte interfacial water redox reaction kinetics are determinative for the photoelectrodes achieving high performances for photoelectrochemical (PEC) water splitting. In this work, well-designed cascading interfaces are introduced in the n-Si photoanode, which is effectively protected by an atomic layer-deposited CoO x thin layer for stabilizing the n-Si photoanode and then coated with an earth-abundant NiCuO x layer for catalyzing the water oxidation reaction. Furthermore, the formed n-Si/CoO x/NiCuO x triple junction could generate a large band bending to provide a considerable photovoltage for promoting the photoinduced charge-transfer and separation processes at the n-Si/CoO x/NiCuO x cascading interfaces. Moreover, at the NiCuO x/electrolyte interface, an in situ electrochemically formed NiCu(OH) x/NiOOH active layer facilitates the water oxidation reaction kinetics. This study demonstrates an alternative approach to stabilize and catalyze n-Si-based photoanodes with cascading interfaces for efficient solar water oxidation.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2019
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Article