Sulphur-reduced graphene oxide composite with improved electrochemical performance for supercapacitor applications

Please read abstract in the article.The South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa.http://www.elsevier.com/locate/hehj2021Physic

Electrochemical analysis of Co3(PO4)2·4H2O/graphene foam composite for enhanced capacity and long cycle life hybrid asymmetric capacitors

In this paper, we explore the successful hydrothermal approach to make Co3(PO4)2·4H2O/GF micro-flakes composite material. The unique sheet-like structure of the graphene foam (GF) significantly improved the conductivity of the pristine Co-based material, which is a key limitation in supercapacitors application. The composite electrode material exhibited superior capacitive conduct in 6 M KOH aqueous electrolyte in a 3-electrode set-up as compared to the pristine cobalt phosphate material. The material was subsequently adopted as a cathode in an asymmetric cell configuration with carbonization of Fe cations adsorbed onto polyaniline (PANI) (C-Fe/PANI), as the anode. The Co3(PO4)2·4H2O/GF//C-FP hybrid device showed outstanding long life cycling stability of approximately 99% without degradation up to 10000 cycles. A specific energy density as high as 24 W h kg−1, with a corresponding power density of 468 W kg−1 was achieved for the device. The results demonstrated the efficient utilization of the faradic-type Co3(PO4)2·4H2O/GF composite along with a functionalized carbonaceous electric double layer (EDL)-type material to produce a hybrid device with promising features suitable for energy storage applications.The South African Research Chairs Initiative (SARChI) of the Department of Science and Technology and the National Research Foundation (NRF) of South Africa (Grant No. 61056). Abdulmajid A. Mirghni acknowledges the financial support from University of Pretoria, the NRF through the SARChI in Carbon Technology and Materials, and also Al Fashir University, Sudan.http://www.elsevier.com/locate/electacta2019-09-01hj2018Physic

Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications

Please read abstract in the article.The South African Research Chairs Initiative (SARChI) of the Department of Science and Technology and the National Research Foundation (NRF) of South Africa (Grant No. 61056).https://www.elsevier.com/locate/jcis2018-05-31hb2017Physic

High-performance asymmetric supercapacitor based on vanadium dioxide and carbonized iron-polyaniline electrodes

Vanadium dioxide (VO2) monoclinic nanosheets were synthesized by a solvothermal method and carbonized iron-polyaniline (C-FP) nanograins were prepared by pyrolysis of iron-polyaniline (PANI) mixture under nitrogen ambient. An asymmetric device (VO2//C-FP) was evaluated with VO2 and C-FP as positive and negative material electrodes in aqueous 6 M KOH electrolyte respectively. The asymmetric supercapacitor (VO2//C-FP) exhibited a 47 mA h g-1 specific capacity and a specific energy of 30Wh kg−1 with an associated specific power of 713 W kg−1 at a gravimetric current of 1 A g−1 in a potential window of 1.6 V. It also displayed an 89% energy efficiency after 10000 galvanostatic charge-discharge cycles with a large improvement after ageing test at a gravimetric current of 10 A g-1.http://scitation.aip.orgcontent/aip/journal/advaam2019Physic

Recycling of biomass wastes from amarula husk by a modified facile economical water salt method for high energy density ultracapacitor application

Please read abstract in the article.South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa.https://www.elsevier.com/locate/esthj2023Physic

Effect of growth-time on electrochemical performance of birnessite manganese oxide (δ-MnO2) as electrodes for supercapacitors : an insight into neutral aqueous electrolytes

Please read abstract in the article.South African Research Chairs Initiative of the Department of Science and Technology; National Research Foundation (NRF) of South Africa and the University of Pretoria.https://www.elsevier.com/locate/est2022-03-02hj2022Physic

A study of Co-Mn phosphate supported with graphene foam as promising electrode materials for future electrochemical capacitors

Please read abstract in the article.The South African Research Chairs Initiative (SARChI) of the Department of Science and Technology and the National Research Foundation (NRF) of South Africa.http://wileyonlinelibrary.com/journal/erhj2023Physic

Waste chicken bone-derived porous carbon materials as high performance electrode for supercapacitor applications

Please read abstract in the article.South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa.https://www.elsevier.com/locate/esthj2023Physic

Enhanced electrochemical performance of supercapattery derived from sulphur-reduced graphene oxide/cobalt oxide composite and activated carbon from peanut shells

Please read abstract in the article.The South African Research Chairs Initiative of the Department of Science and Technology (DST) and National Research Foundation (NRF) of South Africa.http://www.elsevier.com/locate/he2021-10-06hj2021Physic