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Nitrite‐Enhanced Charge Transfer to and from Single Polyaniline Nanotubes
Author(s) -
Liu Jianyun,
Li Xiuting,
BatchelorMcAuley Christopher,
Zhu Guodong,
Compton Richard G.
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201704055
Subject(s) - polyaniline , nitrite , electrochemistry , sulfuric acid , carbon nanotube , redox , electron transfer , aqueous solution , glassy carbon , electron acceptor , materials science , conductivity , inorganic chemistry , chemistry , photochemistry , chemical engineering , electrode , nanotechnology , cyclic voltammetry , organic chemistry , polymerization , polymer , nitrate , engineering
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.