Enhancement of discharge capacity and energy density by oxygen vacancies in nickel doped SrTiO3 as cathode for rechargeable alkaline zinc battery

• المؤلفون الرئيسيون: Wong, Christelle Pau Ping, Lai, Chin Wei, Lee, Kian Mun, Pan, Guan Ting, Huang, Chao Ming, Juan, Joon Ching, Yang, Thomas Chung Kuang
• التنسيق: مقال
• منشور في: Pergamon-Elsevier Science Ltd 2022
• الموضوعات: Q Science (General); QD Chemistry
• الوصول للمادة أونلاين: http://eprints.um.edu.my/43054/

Rechargeable alkaline zinc batteries (RAZBs) are promising aqueous battery due to the advantages of Zn metal as the anode. Although the Zn anode is low cost, non-toxic, and intrinsic safety, the use of metal oxide cathode suffers from poor discharge capacity and energy density in RAZBs. The preparation of Nickel doped SrTiO3 (Ni-STO) as cathode has successfully improved the performance of RAZBs up to 596 mAh cm(-3) (2 mA cm(-2)) with energy density of 68 mWh cm(-3). The discharge capacity is remarkability enhanced by 54% as compared to that of pristine STO as cathode. This proven that the formation of oxy-gen vacancies ( V o spacing diaeresis ) after doped with nickel play an important role. The creation of V o spacing diaeresis enable more charge storage sites and also improve the electric conductivity which facilitates the diffusion of ions/electrons. Based on the charge-transfer resistance, the electrical conductivity of Ni -STO has improved 79% from the 7.8 to 1.6 omega. This outstanding performance of Ni-STO as cathode has benefited RAZBs. (C) 2021 Elsevier Ltd. All rights reserved.