In:
Angewandte Chemie, Wiley, Vol. 131, No. 21 ( 2019-05-20), p. 6965-6969
Abstract:
As the performance of photoanodes for solar water splitting steadily improves, the extension of the absorption wavelength in the photoanodes is highly necessary to substantially improve the water splitting. We use a luminescent back reflector (LBR) capable of photon upconversion (UC) to improve the light harvesting capabilities of Mo:BiVO 4 photoelectrodes. The LBR is prepared by dispersing the organic dye pair meso ‐tetraphenyltetrabenzoporphine palladium and perylene capable of triplet–triplet annhilation‐based UC in a polymer film. The LBR converts the wavelengths of 600–650 nm corresponding to the sub‐band gap of Mo:BiVO 4 and the wavelengths of 350–450 nm that are not sufficiently absorbed in Mo:BiVO 4 to a wavelength that can be absorbed by a Mo:BiVO 4 photoelectrode. The LBR improves the water splitting reaction of Mo:BiVO 4 photoelectrodes by 17 %, and consequently, the Mo:BiVO 4 /LBR exhibits a photocurrent density of 5.25 mA cm −2 at 1.23 V versus the reversible hydrogen electrode. The Mo:BiVO 4 /LBR exhibits hydrogen/oxygen evolution corresponding to the increased photocurrent density and long‐term operational stability for the water splitting reaction.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v131.21
DOI:
10.1002/ange.201813440
Language:
English
Publisher:
Wiley
Publication Date:
2019
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