[논문]Bismuth vanadate photoanode synthesized by electron-beam evaporation of a single precursor source for enhanced solar water-splitting

Hwang, Sung Won; Seo, Dong Hyun; Kim, Jin Un; Lee, Dong Kyu; Choi, Kyoung Soon; Jeon, Cheolho; Yu, Hak Ki; Cho, In Sun

doi:10.1016/j.apsusc.2020.146906

[해외논문] Bismuth vanadate photoanode synthesized by electron-beam evaporation of a single precursor source for enhanced solar water-splitting

Applied surface science, v.528, 2020년, pp.146906 -

Hwang, Sung Won (Department of Materials Science and Engineering, Ajou University) , Seo, Dong Hyun (Department of Materials Science and Engineering, Ajou University) , Kim, Jin Un (Department of Materials Science and Engineering, Ajou University) , Lee, Dong Kyu (Department of Materials Science and Engineering, Ajou University) , Choi, Kyoung Soon (The Advanced Nano Surface Research Group, Korea Basic Science Institute) , Jeon, Cheolho (The Advanced Nano Surface Research Group, Korea Basic Science Institute) , Yu, Hak Ki (Department of Materials Science and Engineering, Ajou University) , Cho, In Sun (Department of Materials Science and Engineering, Ajou University)

Abstract ▼ AI-Helper

Abstract Bismuth vanadate (BiVO4, BVO) is a promising photoanode material for photoelectrochemical water-splitting, and it is mostly prepared using a sol-gel spin-coating method. BVO often exhibits poor PEC performance without modifications such as doping, co-catalyst deposition, and heterojunction formation. Herein, we report an alternative method to deposit a phase-pure BVO film using the electron-beam evaporation (EB) method. Specifically, electron-beam irradiation on the BVO source generates BVO precursor vapors, depositing an amorphous BVO film. The substrate temperature and emission current (of the electron-beam) were varied to control the phase-purity and grain size of the BVO film. The surface chemical state, optical, and electrochemical properties of the BVO films were characterized using X-ray photoelectron spectroscopy, ultraviolet–visible (UV–Vis) spectroscopy, and electrochemical impedance spectroscopy measurements, respectively. Interestingly, we found that BVO prepared under optimal condition has large grains (~400 nm in lateral size) and oxygen vacancies, thus exhibiting enhanced PEC performance. The photocurrent density of ~1.0 mA/cm2 at 1.23 V versus a reversible hydrogen electrode was obtained, which is 50% higher than the sol-gel derived BVO. The photocurrent density increased further to 2.4 mA/cm2 via CoOx co-catalyst deposition. More importantly, the photocurrent stability of EB-BVO was much higher than the sol-gel BVO. Highlight An alternative method to deposit BiVO4 (BVO) through e-beam evaporation of a single precursor source. Substrate temperature and emission current (of the e-beam) controls the phase-purity and grain size. BVO prepared under optimal conditions has large grains and oxygen vacancies, enhancing PEC performance. The e-beam BVO exhibits improved photocurrent density and stability than sol-gel BVO. Graphical abstract [DISPLAY OMISSION]

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DOI : 10.1016/j.apsusc.2020.146906
Elsevier : 저널 > 논문

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