Oxygen­Vacancy­Introduced BaSnO3?δ Photoanodes with Tunable Band Structures for Efficient Solar­Driven Water Splitting

Title
Oxygen­Vacancy­Introduced BaSnO3?δ Photoanodes with Tunable Band Structures for Efficient Solar­Driven Water Splitting
Authors
김진영김명진이병용주현김주현이승우
Issue Date
2019-08
Publisher
Advanced materials
Citation
VOL 31, NO 33, 1903316
Abstract
To achieve excellent photoelectrochemical water‐ splitting activity, photoanode materials with high light absorption and good charge‐ separation efficiency are essential. One effective strategy for the production of materials satisfying these requirements is to adjust their band structure and corresponding bandgap energy by introducing oxygen vacancies. A simple chemical reduction method that can systematically generate oxygen vacancies in barium stannate (BaSnO3 (BSO)) crystal is introduced, which thus allows for precise control of the bandgap energy. A BSO photoanode with optimum oxygen‐ vacancy concentration (8.7%) exhibits high light‐ absorption and good charge‐ separation capabilities. After deposition of FeOOH/NiOOH oxygen evolution cocatalysts on its surface, this photoanode shows a remarkable photocurrent density of 7.32 mA cm− 2 at a potential of 1.23 V versus a reversible hydrogen electrode under AM1.5G simulated sunlight. Moreover, a tandem device constructed with a perovskite solar cell exhibits an operating photocurrent density of 6.84 mA cm− 2 and stable gas production with an average solar‐ to‐ hydrogen conversion efficiency of 7.92% for 100 h, thus functioning as an outstanding unbiased water‐ splitting system.
URI
http://pubs.kist.re.kr/handle/201004/70616
ISSN
0935-9648
Appears in Collections:
KIST Publication > Article
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