Corrosion protection of aluminum in LiPF_6 by poly(3,4-ethylenedioxythiophene) nanosphere-coated multiwalled carbon nanotube

摘要

We propose the synthesis and characterization of poly(ethylenedioxythiophene) nanospheres (PEDOT-NSP) coated onto a multi-walled carbon nanotube (MWNT) (PEDOT-NSP/MWNT) and the application of the resultant materials as a corrosion inhibitor for aluminum in LiPF_6. Doping PEDOT-NSP with negatively charged MWNT minimized the anion exchange property of PEDOT, impeding the penetration of pit-causing PF_6 anions. The COOH groups of MWNT, which remained intact in PEDOT-NSP/MWNT, also blocked the access of anions to the aluminum by electrostatic repulsion. This synergistic effect allowed PEDOT-NSP/MWNT to protect the aluminum more effectively compared with PEDOT and PEDOT-wrapped MWNT with a coaxial structure (PEDOT-COX/MWNT).