In:
Angewandte Chemie, Wiley, Vol. 135, No. 9 ( 2023-02-20)
Abstract:
Photoelectrochemical (PEC) water splitting is a promising approach for renewable solar light conversion. However, surface Fermi level pinning (FLP), caused by surface trap states, severely restricts the PEC activities. Theoretical calculations indicate subsurface oxygen vacancy (sub‐O v ) could release the FLP and retain the active structure. A series of metal oxide semiconductors with sub‐O v were prepared through precisely regulated spin‐coating and calcination. Etching X‐ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy (STEM), and electron energy loss spectra (EELS) demonstrated O v located at sub ∼2–5 nm region. Mott–Schottky and open circuit photovoltage results confirmed the surface trap states elimination and Fermi level de‐pinning. Thus, superior PEC performances of 5.1, 3.4, and 2.1 mA cm −2 at 1.23 V vs. RHE were achieved on BiVO 4 , Bi 2 O 3 , TiO 2 with outstanding stability for 72 h, outperforming most reported works under the identical conditions.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.202217026
Language:
English
Publisher:
Wiley
Publication Date:
2023
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