rGO decorated BiVO4/Cu2O n-n heterojunction photoanode for photoelectrochemical water splitting
| Autor: | Lixia Sun, Aifan Chen, Shiqiang Wei, Ruixian Luo, Haomiao Chu, Jianhua Sun, Jingyi Han, Yingying Zhao, Shouli Bai, Dianqing Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Materials science 060102 archaeology Renewable Energy Sustainability and the Environment 020209 energy Kinetics Heterojunction 06 humanities and the arts 02 engineering and technology Electrolyte Metal Chemical engineering visual_art Electrode 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Water splitting 0601 history and archaeology Charge carrier |
| Zdroj: | Renewable Energy. 148:380-387 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2019.10.044 |
| Popis: | The BiVO4 was firstly prepared by modification’s metal organic decomposition method followed by electrodepositing rGO and Cu2O on BiVO4 to construct the rGO decorated BiVO4/Cu2O n-n heterojunction triadic photoanode for photoelectrochemical (PEC) water splitting. The structure and PEC properties of the photoanode were characterized and measured by various spectral analysis and three electrode system. The highest photocurrent density of the triadic photoanode achieves 2.2 mA/cm2 at 1.8 V (vs. RHE) that is closely 2 folds of single BiVO4 photoanode. The photoanode has the highest IPCE value of 42.0% at 400 nm. The enhanced PEC properties come from the valid separation of the photogenerated electron-hole pair and enhancement of surface oxidation kinetics due to the formation of n-n heterojunction and rGO act as the role of electronic migration mediator accelerates charge carrier transfer, which has been demonstrated by calculated the decrease of charge transfer resistance at electrode/electrolyte interface and prolonging of charge carriers lifetimes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect