Page 93 - Book of Abstracts 2020

th
8 Biannual Conference on Chemistry - CHEM 08

ZIF-67 Encapsulated with Vanadium-Substituted

Polyoxometalates for Highly Stable Asymmetric
Supercapacitors

Aya M. Mohamed , Mohamed Ramadan , Nashaat Ahmed , Ahmed O. Abo
1
1
1,2
2
3
El Naga , Hafsa H. Alalawy , T. Zaki , Seham A. Shaban , Hanaa B. Hassan ,
3
3
2
1
Nageh K. Allam *
1 Energy Materials Laboratory (EML), School of Sciences and Engineering, The
American University in Cairo, New Cairo 11835, Egypt
2 Department of Chemistry, Faculty of Science, Cairo University, Cairo 12613, Egypt
3 Catalysis Department, Refining Division, Egyptian Petroleum Research Institute, Cairo
11727, Egypt

ABSTRACT

Herein, we report on a facile one pot synthesis of polyoxometalates
encapsulated zeolite imidazolate framework cages (PMo10V2@ZIF-67).
The morphological and structural properties of the as synthesized
materials were investigated via FESEM, EDS, XRD and FTIR techniques.
Moreover, N2 adsorption/desorption isotherms and XPS measurements
were carried out to elucidate the textural properties and composition of
the fabricated materials. Upon their use as supercapacitor electrodes, the
PMo10V2@ZIF-67 electrode exhibited a maximum specific capacitance of
765 F/g at a scan rate of 5 mV/s. Furthermore, a supercapacitor device was
assembled using activated carbon as the negative electrode and
PMo10V2@ZIF-67 as the positive electrode, delivering a specific power of
702 W/kg and a corresponding specific energy of 20.9 Wh/kg at a
charging current density of 1 A/g. In addition, the device shows an
excellent long term stability and high Columbic efficiency over 5000
charging and discharging cycles at a charging and discharging current
density of 5 A/g.

Keywords: Supercapacitor; MOFs; Encapsulation; Stability; Capacitance
retention.

BOOK OF ABSTRACTS CHEM 08 (2020) Page 92