# Determination of specific capacitance of modified candlenut shell based carbon as electrode material for supercapacitor
> Zakir M.

URL kanonis: https://discover.unhas.ac.id/publications/determination-of-specific-capacitance-of-modified-candlenut-shell-based-carbon-a
Jurnal / Konferensi: Journal of Physics Conference Series
Tahun terbit: 2018
DOI: https://doi.org/10.1088/1742-6596/979/1/012024
ISSN: 17426588
Citations: 8

## Authors
- Zakir M.

## Abstract
Surface modification of candlenut shell carbon (CSC) using three chemicals: nitric acid (HNO3), hydrogen peroxide (H2O2), and sulfuric acid (H2SO4) has been carried out. Activation of CSC was performed using H3PO4 solution with different ratio between CSC and activator. Carbon surface area was determined by methylene blue adsorption method. Surface characterization was performed using FTIR spectroscopy and Boehm titration method. Specific capacitance of electrode prepared from CSAC (candlenuts shell activated carbon) materials was quantified by Cyclic Voltammetry (CV) measurement. The surface area before and after activation are 105,127 m2/g, 112,488 m2/g, 124,190 m2/g, and 135,167 m2/g, respectively. Surface modification of CSAC showed the improvement in the chemical functionality of CSAC surface. Analyses using FTIR spectroscopy and Boehm titration showed that modifications with HNO3, H2SO4 and H2O2 on the surface of the CSAC increased the number of oxygen functional groups. As a consequence, the specific capacitance of CSAC modified with 65% HNO3 attained the highest value (127 μF/g). There is an incredible increase by a factor of 298% from electrode which was constructed with un-modified CSAC material. This increase correlates to the largest number of oxygen functional groups of CSAC modified with nitric acid (HNO3).

## Keywords
- Nitric acid
- Cyclic voltammetry
- Activated carbon
- Surface modification
- Adsorption
- Hydrogen peroxide
- Sulfuric acid
- Supercapacitor
- Fourier transform infrared spectroscopy
- Titration
- Glassy carbon
- Specific surface area
- Chemistry
- Nuclear chemistry
- Materials science
- Inorganic chemistry
- Electrode
- Capacitance
- Chemical engineering
- Electrochemistry
- Organic chemistry
- Catalysis
- Physical chemistry
- Engineering

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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