Fig. 6. (a) Preparation of covalently immobilized Co tetraphenylporphyrin (CoTPP-cov); (b) cyclic voltammetry (CVs) of CoTPP-cov in N2- and CO2-purged aqueous solution, CVs of bare carbon cloth are shown for clarity; (c) CV traces of CoTPP-noncov with a variable amount of noncovalently immobilized CoTPP in CO2-saturated solution. Conditions: electrolyte: 0.5 M KHCO3 in all cases, potential scan rate is 100 mV s−1.105 Copyright 2019 Elsevier B.V.
