Accelerating the controlled synthesis of WO3 photoanode by modifying aerosol-assisted chemical vapour deposition for photoelectrochemical water splitting

• Published in: Chemical Engineering Science
• Main Author: Arzaee N.A.; Mohamad Noh M.F.; Aadenan A.; Nawas Mumthas I.N.; Ab Hamid F.F.; Kamarudin N.N.; Mohamed N.A.; Ibrahim M.A.; Ismail A.F.; Mat Teridi M.A.
• Format: Article
• Language: English
• Published: Elsevier Ltd 2022
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120890427&doi=10.1016%2fj.ces.2021.117294&partnerID=40&md5=cd2ffd04deb3198dd376160ecda1a8e8

Aerosol-assisted chemical vapour deposition (AACVD) is capable of producing WO3 film with good optical and electrical properties for photoelectrochemical (PEC) water splitting. However, the conventional AACVD method is time-consuming because post-annealing treatment is usually required after WO3 film was deposited under nitrogen flow. Therefore, we omitted the post-annealing treatment by employing purified air as carrier gas (known as one-step) instead of nitrogen (known as two-step) which decreases the fabrication time by 13-fold. One-step WO3 also shows improved charge separation and PEC reaction due to the coexistence of (0 0 2), (0 2 0) and (2 0 0) facets and higher oxygen vacancies. Further optimization using acetone/ethanol as solvent, 10 min deposition time and 450 °C deposition temperature leads to photocurrent density of 0.32 mA cm−2 at 1.23 VRHE, which is the highest performance reported for AACVD-based WO3 photoanode. The development of rapid and industrially applicable deposition method would pave the way for real practice of PEC technology. © 2021 Elsevier Ltd