Nitrite-Enhanced Charge Transfer to and from Single Polyaniline Nanotubes

Jianyun Liu; Xiuting Li; Christopher Batchelor-McAuley; Guodong Zhu; Richard G Compton

doi:10.1002/chem.201704055

Nitrite-Enhanced Charge Transfer to and from Single Polyaniline Nanotubes

Chemistry. 2017 Dec 14;23(70):17823-17828. doi: 10.1002/chem.201704055. Epub 2017 Nov 16.

Authors

Jianyun Liu^{1

2}, Xiuting Li², Christopher Batchelor-McAuley², Guodong Zhu¹, Richard G Compton²

Affiliations

¹ State Environmental Protection Engineering Center for Pollution Treatment and Control in the Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
² Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK.

PMID: 29068104
DOI: 10.1002/chem.201704055

Abstract

As Liu et al. reported previously (Appl. Mater. Today 2017, 7, 239-245), the charge transfer to partially oxidized polyaniline (PANI) nanotubes in electrochemical reactions is heavily limited due to the non-conductivity of the reduction/oxidation products. In this paper, the doping level of individual PANI nanotubes was substantially enhanced using nitrite as an electron acceptor in sulfuric acid aqueous solution as recorded by the nano-impact method. The charge transferred to one single tube during reduction process is close to the theoretical value of 170±112 pC per tube (assuming 2-electron reduction for the PANI tubes studied), while the charge during PANI oxidation is dramatically decreased. Reaction processes are proposed based on the oxidative properties of nitrite in acid solution. UV-visible spectroscopy analysis further confirms an oxidation-reduction reaction between PANI and nitrite. In contrast the electrochemical reaction of ensembles (21 μg cm^-1 ) of PANI tubes on glassy carbon electrodes simply show limited electrocatalytic activity.

Keywords: charge transfer; electrochemistry; nano-impact; nanotubes; nitrite; polyaniline.