Abstract
Bismuth vanadate (BiVO4) is a promising photoanode material; however, its efficiency significantly changes depending on the atomic ratio of Bi/V, and there is no suitable method for synthesizing large-area photoanodes. In this study, an efficient BiVO4 photoanode was fabricated via sputtering, by manipulating the molar ratio of Bi/V with V solution annealing. V solution annealing not only adjusted the atomic ratio of Bi/V but also increased the number of O vacancies, thereby improving the charge-separation and charge-transport efficiencies. Consequently, the photocurrent density of the sputtered photoanode with V solution annealing (BVO-V) was 1.86 mA/cm2, which is 23 times higher than that of the sputtered photoanode annealed under air conditions (BVO-A, 81.0 μA/cm2). Furthermore, microcone-patterned fluorine-doped SnO2 was fabricated to increase the active area and reduce the high reflectance, owing to the dense deposition because of the sputtering. Thus, the photocurrent density of the MC-BVO was 3.11 mA/cm2, which is approximately 67% higher than that of BVO-V (1.86 mA/cm2).
Original language | English |
---|---|
Pages (from-to) | 17923-17932 |
Number of pages | 10 |
Journal | ACS Sustainable Chemistry and Engineering |
Volume | 8 |
Issue number | 49 |
DOIs | |
Publication status | Published - 2020 Dec 14 |
Bibliographical note
Funding Information:This research was supported by the International Research & Development Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (Grant number: 2019K1A47A02113032), Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2018M3D1A1058972), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C3006382).
Publisher Copyright:
©
Keywords
- BiVOsputtering
- PEC water splitting
- V solution annealing
- direct printing
- patterned FTO
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Renewable Energy, Sustainability and the Environment