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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 license (http://creativecommons.org/licenses/by/3.0/).
a Determined at 20 °C with 0.1 M TBAP as the supporting electrolyte; scan rate 100 mVs-1; b This is converted from the value reported in V vs. SCE (E1/2 = -2.29 V vs. SCE) [28], where conversion was made using E(Fc/Fc+) = E(SCE) – 0.433 V [31].