Enhancement of discharge capacity and energy density by oxygen vacancies in nickel doped SrTiO3 as cathode for rechargeable alkaline zinc battery
Document Type
Article
Publication Date
2-1-2022
Abstract
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.
Keywords
Nickel, SrTiO3, Rechargeable alkaline zinc battery, Oxygen vacancies, Hydrothermal
Divisions
nanotechnology
Funders
Universiti Malaya [Grant No: GC002A-15SBS; PV029-2017; RU001-2020],Institute of Research Management & Services (Student Fi-nancial Aid 2019),National Taipei University of Technology-University of Malaya Joint 5 Research Program [Grant No: NTUT-UM-109-02]
Publication Title
Electrochimica Acta
Volume
404
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND