ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The enhancement of specific capacitance of carbon derived from spent coffee grounds with SiO₂ nanoparticles

Imam Hidayat Nurwahid, Munawar Khalil, and Rika Tri Yunarti

Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, Indonesia

E-mail: rika.tri@sci.ui.ac.id

Received: 14 July 2022  Accepted: 11 November 2022

Abstract:

The utilization of natural materials that are abundant in nature, especially waste from industrial production, can be a solution to reduce environmental pollution. In this study, spent coffee grounds have been successfully processed into carbon precursors through the pyrolysis process with an amorphous structure. Coffee grounds carbon was then successfully integrated with SiO₂ nanoparticles into SiO₂/C composites through sonochemical methods. Composites were characterized to understand their structural properties and determine their ability as electrodes. All electrode materials can store energy with different specific capacitance values, which is very important in energy storage systems. Modification with the addition of SiO₂ nanoparticles can enhance the specific capacitance of carbon (from 463.06 F g⁻¹ on the coffee grounds carbon to 545.81 F g⁻¹ on the SiO₂/C coffee grounds composite). The analysis in this study found that the phenomenon is closely related to the structural properties of carbon and the presence of SiO₂ as an oxide that causes the redox reaction.

Graphical abstract

Keywords: Carbon; Spent coffee grounds; SiO2 nanoparticles; Specific capacitance; Cyclic voltammetry

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02590-6

Chemical Papers 77 (3) 1669–1681 (2023)