Tuning nanosheet Fe 2 O 3 photoanodes with C 3 N 4 and p-type CoO x decoration for efficient and stable water splitting
Fe 2 O 3 photoanodes are ideal candidates for photoelectrochemical (PEC) water splitting. However, the charge recombination in the bulk and at the photoanode/electrolyte interface decreases their PEC performance. Here, C 3 N 4 and p-type CoO x are firstly decorated on Fe 2 O 3 nanosheets for PEC per...
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Veröffentlicht in: | Catalysis science & technology 2018, Vol.8 (12), p.3144-3150 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Fe
2
O
3
photoanodes are ideal candidates for photoelectrochemical (PEC) water splitting. However, the charge recombination in the bulk and at the photoanode/electrolyte interface decreases their PEC performance. Here, C
3
N
4
and p-type CoO
x
are firstly decorated on Fe
2
O
3
nanosheets for PEC performance enhancement and mechanism study. The photocurrent densities of Fe
2
O
3
/C
3
N
4
and Fe
2
O
3
/C
3
N
4
/CoO
x
photoanodes are about 1.6 and 2 times at 1.23 V
vs.
RHE (reversible hydrogen electrode) compared with that of the Fe
2
O
3
film (0.74 mA cm
−2
) under simulated sun light irradiation. Correspondingly, their photocurrent onset potentials are negatively shifted by about 0.09 and 0.19 V compared with that of Fe
2
O
3
(0.81 V
RHE
). The solar-to-hydrogen conversion efficiency reaches 0.17% and the incident photo-to-current conversion efficiency (IPCE) achieves 81.7% at 385 nm for the Fe
2
O
3
/C
3
N
4
/CoO
x
hybrid photoanode. The matched band alignments between Fe
2
O
3
and C
3
N
4
result in more efficient charge separation, and the p-type CoO
x
cocatalyst reduces surface recombination and shows quicker water oxidation reaction kinetics at the semiconductor/electrolyte interface. |
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ISSN: | 2044-4753 2044-4761 |
DOI: | 10.1039/C8CY00729B |