Prof.  Ewa  Mijowska
West Pomeranian University of Technology,  Poland

Title: Boosting of Zn-ion hybrid capacitor performance using Ni based metaloorganic frameworks

Abstract:

Zinc-based energy storage technology has received significant attention among aqueous electrolyte systems due to the unique properties of metallic zinc. Metallic zinc has a high theoretical capacity (820 mAh/g), a relatively low redox potential (-0.76 V vs. the standard hydrogen electrode), is low-cost, non-toxic, and compatible with aqueous environments. Zinc ion hybrid capacitors (ZIHCs) are particularly promising due to their combination of high energy density and high power output, achieved by integrating a battery-type zinc anode and a capacitive-type carbon cathode into one device. Recently, an increasing focus has been on developing new electrode materials for ZIHCs.

The objective of this research was to design new nanocomposites bosting Zn-ion capacitors (ZnIC) in order to enhance their specific capacity, power, and energy while ensuring stability over repeated cycles. The synthesis process involved the fabrication of Ni based metaloorganic frameworks (Ni-MOF), followed by thermal treatment resulting in the formation of carbon material (CNi-MOF). In order to examine the electrochemical behavior of the material during charge-discharge cycles, in-situ Raman and X-Ray Diffractometry (XRD) analyses were conducted. The nanocomposites were evaluated for their electrochemical applicability using techniques such as cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), and potentio electrochemical impedance spectroscopy (PEIS). The designed nanocomposite exhibited enhanced performance in terms of specific capacity (732 F/g) at 0.1 A/g, indicating its potential use in energy storage devices. However, further optimization is necessary to improve capacity retention under higher current densities. The primary implication of this study is the potential development of cost-effective, high-performance energy storage devices for various applications, thereby contributing to the advancement of renewable energy sources.

Keywords

Metaloorganic frameworks (MOF), Zn-ion hybrid capacitors, energy storage

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