Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018)
    Energy Harvesting & Storage Tuesday Sessions
       Session EH-TuP

Paper EH-TuP1
Oxygen Vacancies Boost δ-Bi2O3 as High-Performance Electrode for Rechargeable Aqueous Batteries

Tuesday, December 4, 2018, 4:00 pm, Room Naupaka Salon 1-3

Session: Energy Harvesting and Storage Poster Session
Presenter: TingTing Qin, State Key Laboratory of Automotive Simulation and Control, and School of Materials Science & Engineering, and Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun 130012, China
Authors: T. Qin, State Key Laboratory of Automotive Simulation and Control, and School of Materials Science & Engineering, and Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun 130012, China
W. Zhang, State Key Laboratory of Automotive Simulation and Control, and School of Materials Science & Engineering, and Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun 130012, China
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Metal oxides as electrode materials are of great potential for rechargeable aqueous batteries. However，they suffer from inferior cycle stability and rate capability because of poor electronic and ionic conductivities. Herein, taking vertically-orientated Bi2O3 nanoflakes on Ti substrates as examples, we found that δ-Bi2O3 electrode with plenty of intrinsic positively-charged oxygen defects have shown remarkably higher specific capacity (264 mAh g-1) and far superior rate capability than that of α -Bi2O3 with less oxygen vacancies . Through pinpointing the existence form and the role of oxygen vacancies within the electrochemical processes, we demonstrate that oxygen vacancies in δ-Bi2O3 serve as central entrepots collecting OHˉ groups via electrostatic force effect, which has boosted the oxidation reaction and enhanced the electrochemical properties. Besides, oxygen vacancies can largely facilitate electronic conductivity. Our work merited an excellent Bi2O3 negative electrode material via giving full play to the role of oxygen vacancies in electrochemical energy storage.