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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Cyclic voltammetry (CV) curves of HPGC and HPC electrodes at scan rates of 5 mV s−1 (a) and 50 mV s−1 (b); CV curves of HPC (c) and HPGC (d) electrodes at different scan rates from 5 mV s−1 to 100 mV s−1.