Synthesis and characterization of zinc aluminate electrodes for supercapacitor applications

We report, for the first time, the thorough electrochemical characterization of zinc aluminate spinel. Four different stoichiometric composition of zinc aluminate (ZnAl1.5O3.25, ZnAl2O4, ZnAl2.87O5.30, and ZnAl4O7) were prepared by solution combustion method. The obtained powders after calcination at 1000 °C were characterized through scanning electron microscope (SEM), energy dispersive x-ray spectroscopy (EDX) and x-ray diffraction to analyze the morphology, elemental composition and structure, respectively, of the zinc aluminate compositions. The electrodes were prepared by coating slurry of zinc aluminate, carbon black and polyvinylidene fluoride on nickel foam in a ratio of 8:1:1. The electrochemical characterization was carried out by cyclic voltammetry (CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS). ZnAl1.5O3.25 exhibited the highest specific capacity of 546 C/g at 1 mV/s and 336 C/g at 1 A/g, as appraised by CV and GCD analysis, respectively. EIS test revealed that ZnAl1.5O3.25 had the modest impedance value. The energy density value for ZnAl1.5O3.25 sample was 16.79 Wh/kg at 1 A/g with a power density of 179.9 W/kg. The as developed electrodes showed predominantly pseudo-capacitive charge storage mechanism.

Latif, UmarUniversity of the Punjab, Pakistan (författare)
Fazal, AsmaraUniversity of the Punjab, Pakistan (författare)
Rehman, Haseeb UrUniversity of the Punjab, Pakistan (författare)
Bukhari, Syed Muhammad SaqibUniversity of the Punjab, Pakistan (författare)
Eriksson, Mirva,1975-Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm University, Sweden(Swepub:su)mhein (författare)
Iqbal, Muhammad JavaidUniversity of the Punjab, Pakistan (författare)
Ali, Sharafat,Associate Professor,1976-Linnéuniversitetet,Institutionen för byggd miljö och energiteknik (BET)(Swepub:lnu)salkem (författare)
Almutairi, Badriah S.Princess Nourah Bint Abdulrahman University, Saudi Arabia (författare)
University of the Punjab, PakistanInstitutionen för material- och miljökemi (MMK) (creator_code:org_t)

Av författaren/redakt...: Raza, Mohsin Ali; Latif, Umar; Fazal, Asmara; Rehman, Haseeb U ...; Bukhari, Syed Mu ...; Eriksson, Mirva, ...; visa fler...; Iqbal, Muhammad ...; Ali, Sharafat, A ...; Almutairi, Badri ...; visa färre...

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