Oxygen Vacancies Boost δ-Bi2O3 as a High-Performance Electrode for Rechargeable Aqueous Batteries

• DOI: 10.1021/acsami.8b19575
• Publication Date: 2018-12-13T17:12:18Z
• Authors: Tingting Qin; Xiaoyu Zhang; Dong Wang; Ting Deng; Haoxiang Wang; Xiaofei Liu; Xiaoyuan Shi; Zhengming Li; Hong Chen; Xiangmin Meng; Wei Zhang; Weitao Zheng
• Keywords: Oxygen evolution; Electrochemical energy conversion

Metal oxides as electrode materials are of great potential for rechargeable aqueous batteries. However, they suffer from inferior cycle stability and rate capability because poor electronic ionic conductivities. Herein, taking vertically orientated Bi2O3 nanoflakes on Ti substrates examples, we find that the δ-Bi2O3 with plenty positively charged oxygen defects show remarkably higher specific capacity (264 mA h g-1) far superior than α-Bi2O3 less vacancies. Through pinpointing existence form role vacancies within electrochemical processes, demonstrate in can not only promote electrical conductivity but also serve central entrepots collecting OH- groups via electrostatic force effect, which has boosted oxidation reaction enhanced properties. Our work merits an excellent negative material giving full play to energy storage.