Abstract
| Original language | English |
|---|---|
| Journal | Catalysis Today |
| Volume | 321-322 |
| Pages (from-to) | 87-93 |
| ISSN | 0920-5861 |
| DOIs | |
| Publication status | Published - 2019 |
Keywords
- Bismuth vanadate
- FeOOH
- Hydrogen treatment
- Photoelectrochemical
- Solar hydrogen
Cite this
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Hydrogen Treatment and FeOOH overlayer: Effective approaches for enhancing the photoelectrochemical water oxidation performance of bismuth vanadate thin films. / Singh, Aadesh P. ; Saini, Nishant ; Mehta, Bodh R. ; Hellman, Anders; Iandolo, Beniamino; Wickman, Björn.
In: Catalysis Today, Vol. 321-322, 2019, p. 87-93.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - Hydrogen Treatment and FeOOH overlayer: Effective approaches for enhancing the photoelectrochemical water oxidation performance of bismuth vanadate thin films
AU - Singh, Aadesh P.
AU - Saini, Nishant
AU - Mehta, Bodh R.
AU - Hellman, Anders
AU - Iandolo, Beniamino
AU - Wickman, Björn
PY - 2019
Y1 - 2019
N2 - The water oxidation capability of the promising photoanode bismuth vanadate (BiVO4) is hampered by poor bulk electron transport and by high rates of charge recombination at the semiconductor/electrolyte interface. Here, we demonstrate that a dual modification of BiVO4 by: (i) annealing in a hydrogen-containing environment and (ii) coating with FeOOH overlayer substantially enhances the water oxidation ability of BiVO4 photoanodes. Hydrogen treated, FeOOH coated BiVO4 photoanodes exhibit a water oxidation photocurrent density of 2.16 mA cm−2 at 1.23 VRHE, which is 5 times higher than for untreated BiVO4 films. Moreover, they showed an impressive low photocurrent onset potential of −0.11 VRHE. A stable photocurrent was observed for 1 h of water oxidation measurement at 1.23 VRHE under 1 Sun illumination. The enhanced photocurrent of FeOOH/H:BiVO4 photoanode is ascribed to an improved bulk charge transport, as confirmed by impedance spectroscopy measurements and Mott-Schottky analysis. The cathodic shift of the onset potential originates from a lowering of the flat band potential and from an improvement of the charge transport at the semiconductor/electrolyte interface. The dual modification strategy used here offers a simple but effective approach of improving the water oxidation performance of BiVO4.
AB - The water oxidation capability of the promising photoanode bismuth vanadate (BiVO4) is hampered by poor bulk electron transport and by high rates of charge recombination at the semiconductor/electrolyte interface. Here, we demonstrate that a dual modification of BiVO4 by: (i) annealing in a hydrogen-containing environment and (ii) coating with FeOOH overlayer substantially enhances the water oxidation ability of BiVO4 photoanodes. Hydrogen treated, FeOOH coated BiVO4 photoanodes exhibit a water oxidation photocurrent density of 2.16 mA cm−2 at 1.23 VRHE, which is 5 times higher than for untreated BiVO4 films. Moreover, they showed an impressive low photocurrent onset potential of −0.11 VRHE. A stable photocurrent was observed for 1 h of water oxidation measurement at 1.23 VRHE under 1 Sun illumination. The enhanced photocurrent of FeOOH/H:BiVO4 photoanode is ascribed to an improved bulk charge transport, as confirmed by impedance spectroscopy measurements and Mott-Schottky analysis. The cathodic shift of the onset potential originates from a lowering of the flat band potential and from an improvement of the charge transport at the semiconductor/electrolyte interface. The dual modification strategy used here offers a simple but effective approach of improving the water oxidation performance of BiVO4.
KW - Bismuth vanadate
KW - FeOOH
KW - Hydrogen treatment
KW - Photoelectrochemical
KW - Solar hydrogen
U2 - 10.1016/j.cattod.2018.03.041
DO - 10.1016/j.cattod.2018.03.041
M3 - Journal article
VL - 321-322
SP - 87
EP - 93
JO - Catalysis Today
JF - Catalysis Today
SN - 0920-5861
ER -