Journal
CHEMICAL ENGINEERING JOURNAL
Volume 281, Issue -, Pages 368-378Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.06.062
Keywords
Ni-Fe0.01Zn redox battery; Charge/discharge test; Capacity; ZnO dendrites
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Funding
- World Class 300 Project, Small and Medium Business Administration, Republic of Korea
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Nanometer sized ZnO and Fe0.01ZnO materials are synthesized by modified sol gel method to improve electrochemical performance of alkaline Ni-Zn batteries. The samples have been characterized and tested using X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), zeta potentials, cyclic voltammetry (CV) and galvanostatic charge and discharge cycles. Pure ZnO shows a nano-rod morphology with 20 nm x 40 nm in size, otherwise, the Fe addition exhibits spherical particles <15 nm in size. Fe0.01ZnO displays high power, higher capacity and longer life cycle for rechargeable alkaline Ni-Zn battery. The capacity in Ni-Fe0.01ZnO battery was 230 mA h g(-1) and it was higher than 180 mA h g(-1) in Ni-ZnO battery after cycling at current density 30 mA cm(-2). Moreover, it is found that dendrite growth is suppressed on the zinc electrode during charge-discharge cycles. These results indicate that the small amount of Fe inserted into the lattice of the ZnO framework produces promising electrodes for use in NI-Zn batteries. (C) 2015 Elsevier B.V. All rights reserved.
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