Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 23, Pages 9047-9054Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202001919
Keywords
depletion layers; mesocrystals; multihole water oxidation; oxygen vacancies; photoelectrochemistry
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Funding
- Kaneka Corporation
- JST PRESTO [JPMJPR1316]
- JST A-STEP [AS3011905T]
- JSPS KAKENHI [JP18H01944, JP18H04517]
- Marubun Research Promotion Foundation
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Significant charge recombination that is difficult to suppress limits the practical applications of hematite (alpha-Fe2O3) for photoelectrochemical water splitting. In this study, Ti-modified hematite mesocrystal superstructures assembled from highly oriented tiny nanoparticle (NP) subunits with sizes of ca. 5 nm were developed to achieve the highest photocurrent density (4.3 mA cm(-2) at 1.23 V vs. RHE) ever reported for hematite-based photoanodes under back illumination. Owing to rich interfacial oxygen vacancies yielding an exceedingly high carrier density of 4.1x10(21) cm(-3) for super bulk conductivity in the electrode and a large proportion of ultra-narrow depletion layers (<1 nm) inside the mesoporous film for significantly improved hole collection efficiency, a boosting of multihole water oxidation with very low activation energy (E-a=44 meV) was realized.
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