期刊
CATALYSIS TODAY
卷 358, 期 -, 页码 412-421出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.08.005
关键词
3D TiO2 nanotree arrays; Ag/g-C3N4 heterojunction; Electron transport layer; Ultrasonic-assisted spin coating; Photo water oxidation; Host-guest design
资金
- National Research Foundation of Korea (NRF) - Korea government (MIST: Ministry of Science and ICT) [2019R1A2C2085250]
- National Research Foundation of Korea [2019R1A2C2085250] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphitic carbon nitride (g-C3N4) has been extensively studied as a model of polymeric semiconductor material in photoelectrochemical (PEC) water oxidation reaction; however, its low PEC performance is still a concern of significant importance among researchers. Herein, we did a novel host-guest design of a photoanode device comprising three dimensional (3D) TiO2 nanotree (NT) arrays as an electron transfer layer (ESL) and Ag/g-C3N4 heterojunction as a photo absorber layer. In this design, 3D TiO2 NT arrays synthesized via a hydrothermal growth treatment were deposited with an alcoholic suspension of Ag/g-C3N4 using different coating methods such as drop casting, spin coating, and ultrasonic assisted-spin (U-spin) coating methods. The optimized photoanode prepared via U-spin coating exhibited a remarkable photocurrent density of 1.4 mA cm(-2) at 1.23 V vs. RHE and a negatively shifted onset potential of 0.2 V in 1.0 M KOH when it was illuminated from the backside using a Xenon lamp (150 W) equipped with a 400 nm cut off filter. This hierarchical 3D design photoanode demonstrated constant stability during the water oxidation reaction for at least 8 h.
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