Simultaneous Improvement of Absorption and Separation Efficiencies of Mo:BiVO4 Photoanodes via Nanopatterned SnO2/Au Hybrid Layers
- Authors
- Ju, Sucheol; Jun, Junho; Huh, Daihong; Son, Soomin; Sung, Young Hoon; Park, Jaemin; Kim, Wonjoong; Baek, Seungho; Lee, Heon
- Issue Date
- 21-10월-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- PEC water splitting; nanopatterned electrode; direct printing; resolve short carrier diffusion length; multi light scattering
- Citation
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.7, no.20, pp.17000 - 17007
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS SUSTAINABLE CHEMISTRY & ENGINEERING
- Volume
- 7
- Number
- 20
- Start Page
- 17000
- End Page
- 17007
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62187
- DOI
- 10.1021/acssuschemeng.9b02452
- ISSN
- 2168-0485
- Abstract
- BiVO4 has a thickness limitation because of carrier diffusion length; thus, the light-absorption efficiency is limited. To resolve this issue, we propose coating Mo:BiVO4 on nanopatterned electrodes fabricated via direct-printing technology, which is the most suitable patterning technology for energy-related fields in cases where cost effectiveness is important. We designed two types of nanoelectrodes: nanocone (NC) and reverse NC (RNC). Nanopatterned electrodes mitigate the problems of the short carrier-diffusion length, allowing a larger amount of Mo:BiVO4 to be coated. Also, the Au electrode acts as a back reflector, causing multiple light scattering. The nanopatterned electrode increases the carrier-separation efficiency and the light-absorption efficiency simultaneously owing to the larger amount of Mo:BiVO4 and multiple light scattering. The photocurrent densities of the Au/SnO2/Mo:BiVO4 NC electrode, a corresponding RNC electrode, and a flat electrode were 1.53, 1.35, and 0.44 mA/cm(2), respectively, at 1.23 V-RHE under 1-sun illumination.
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