Open Access

ARTICLE

Hydrothermal synthesis of strontium sulfide/nitrogen-graphene quantum dot composites for next-generation supercapattery devices

W. Abbas^a,*, A. Mahmood^b, W. Al-Masry^b, C. W. Dunnill^c

a Department of Physics, COMSATS, Lahore Campus, Pakistan
b Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
c Energy Safety Institute (ESRI), Swansea University Bay Campus, Swansea, SA1 8EN, UK

* Corresponding Author:

Chalcogenide Letters 2024, 21(11), 953-963. https://doi.org/10.15251/CL.2024.2111.953

Received 03 September 2024; Accepted 30 November 2024;

Abstract

A supercapattery merges the advantageous characteristics of batteries and supercapacitors (SCs). During this research, we synthesized strontium sulfide (SrS) using the hydrothermal method, and then we doped it with nitrogen/graphene quantum dots (N-GQDs). For SrS/NGQDs, the Brunauer-Emmett-Teller (BET) analysis determined the total surface area to be 15.50 m² /g. Using the three-electrode assembly, the composite strontium sulfide (SrS/NGQDs) revealed a specific capacity (C_s) of 737 Cg^-1 . Battery-graded SrS/N-GQDs was utilized as anode and activated carbon (AC) as cathode to assemble a hybrid supercapacitor (SC). It delivered a remarkable power density of 1440 Wkg^-1 , the SrS/N-GQDs//AC supercapattery displayed 167 Cg^-1 in terms of capacity and an energy density of 35.7 Whkg ^-1 . SrS/N-GQDs//AC maintained 91% of its initial capacity after 5000 cycles. SrS/N-GQDs has remarkable electrochemical performance, indicating its potential use as a nanostructured electrode in next-gen electrochemical energy storage (EES) devices.

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Keywords

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