Synthesis of CaCr2O4/carbon nanoplatelets from non-condensable pyrolysis gas of plastics for oxygen reduction reaction and charge storageSynthesis of CaCr2O4/carbon nanoplatelets from non-condensable pyrolysis gas of plastics for oxygen reduction reaction and charge storage Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2020-04-232019enAn integrated pyrolysis and chemical vapor deposition using CaCrO4 as a precursor were applied to convert mixed plastics into a nanocomposite comprising CaCr2O4 and carbon nanoplatelets (CaCr2O4/CNPs). During pyrolysis, plastics were decomposed into oil and non-condensable gas. While reacting with the precursor, non-condensable pyrolysis gas containing hydrocarbons and H2 played a dual role: (1) provided carbon for nanoplatelets growth and (2) facilitated reduction of Cr(VI) to Cr(III). Cyclic voltammetry demonstrated the synergistic effect of CaCr2O4 and CNPs on the heterogeneous electron transfer rate. The nanocomposite showed good performance as an electrocatalyst for oxygen reduction reaction increasing current density and reducing overpotential to −0.27 V vs Ag/Ag/KCl (sat.) at 0.06 mA cm−2. Furthermore, the nanocomposite exhibited a specific electrochemical capacitance as high as 60 F g−1 at 2 A g−1 and 67% stability over 3000 cycles, demonstrating the capability of electrode for fast charge/discharge, long cycling life and high reversibility.http://creativecommons.org/licenses/by/4.0/Journal of Electroanalytical Chemistry849September 2019Veksha_et_al_J. Electronal. Chem._849_2019.pdfChania [Greece]Library of TUC2020-04-21application/pdf2.0 MBfree Veksha Andrei Moo James Guo Sheng Krikštolaitytė, Vida 1984- Oh Wen Da Udayanga W. D.Chanaka Giannis Apostolos Γιαννης Αποστολος Lisak Grzegorz Elsevier Carbon nanoplatelets Chromium composite Electrochemical capacitance Heterogeneous electron transfer Oxygen reduction reaction