| Title | Anomalous Photoinduced Reconstructing and Dark Self-Healing Processes on Bi2O2S Nanoplates |
| Authors | An, Yiming Xing, Zheng Zhu, Kaicheng Lin, He Su, Haibin Yang, Shihe |
| Affiliation | Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China Peking Univ, Guangdong Key Lab Nanomicro Mat Res, Sch Chem Biol & Biotechnol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China |
| Keywords | WATER SULFUR SUPERCONDUCTIVITY PHOTOCATALYSTS PHOTOCORROSION INHIBITION ELECTRODES REDUCTION COMPOSITE OXIDE |
| Issue Date | 17-Sep-2020 |
| Publisher | JOURNAL OF PHYSICAL CHEMISTRY LETTERS |
| Abstract | We report an anomalous photoinduced reconstructing and dark self-healing process on Bi2O2S nanoplates by monitoring the time profile of open-circuit potential (OCP). When the light was switched on and off on the nanoplates, we observed pronounced and repeatable decrement-recovery cycles of the OCP signal, which are inexplicable by a rapid electron-hole separation-recombination process only as in a conventional semiconductor. It is proposed that upon irradiation, accumulation of photogenerated holes at the electrode surface caused oxidation of the S layers of Bi2O2S nanoplates into certain intermediates, which, when the light was turned off, were then reduced back to the original state by the electron back flow. Raman scattering spectroscopy provided te S-S vibrational signature of the intermediate, evidencing the hole oxidative dimerization of the S-2-species and the inverse reductive S-S dissociation process. The photophysics and photochemistry of semiconductor nanoplates reported here may inspire the development of energy devices, switches, and memristors. |
| URI | http://hdl.handle.net/20.500.11897/592427 |
| ISSN | 1948-7185 |
| DOI | 10.1021/acs.jpclett.0c01928 |
| Indexed | SCI(E) |
| Appears in Collections: | 化学生物学与生物技术学院 |
