Comparison between Carbon Nanotube-Based, Graphite-Based, and Rice Hull Carbon-Based Electrodes with Rice Hull Silica as Catalyst for Electrochemical Detection of Copper

Leandre Emile D. Apostol; Jose Victor O. Sacueza; John Paul Klien Zeus S. Visaya; Franz Kevin B. Manalo; Emmanuel A. Florido

doi:10.4028/www.scientific.net/KEM.775.283

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Comparison between Carbon Nanotube-Based, Graphite-Based, and Rice Hull Carbon-Based Electrodes with Rice Hull Silica as Catalyst for Electrochemical Detection of Copper

Abstract:

This study aimed to determine the copper ion-sensing ability of a carbon nanotube (CNT)-based sensor with carbonized rice hull (CRH) as catalyst. The 50:50 CNT-CRH electrode was compared to 100% graphite, 100% CRH, 100% CNT, 50:50 graphite-CRH, and 70:30 graphite-CRH electrodes. Copper chloride (CuCl₂) concentrations of 0.01M, 0.02M, 0.03M, 0.04M, 0.04M, 0.05M, 0.06, 0.07M, 0.08M, 0.09M, and 0.1M were used to test the response of the electrodes. Five trials were done for each concentration. The 50:50 CNT-CRH electrode exhibited good sensor characteristics such as high sensitivity, low resolution, and high correlation in concentration-voltage relationship. Electrical characterization using three-electrode system showed a linear relationship between the concentrations and voltage response. The 50:50 CNT-CRH electrode exhibited a sensitivity of 0.0619 V/0.01M or 9.7 mV/100ppm and a resolution of 10 ppm/1mV. The electrode also exhibited a high correlation R² value of 0.933.

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Periodical:

Key Engineering Materials (Volume 775)

Pages:

283-288

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.775.283

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Online since:

August 2018

Authors:

Leandre Emile D. Apostol, Jose Victor O. Sacueza, John Paul Klien Zeus S. Visaya, Franz Kevin B. Manalo, Emmanuel A. Florido*

Keywords:

Carbon Nanotube, Carbon Paste Electrode, Copper Detection, Rice Hull Silica, Voltage Response

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