Issue 11, 2022

Protonating imine sites of polyaniline for aqueous zinc batteries

Abstract

PANI materials usually contain a certain amount of insulating components, e.g., imine ([double bond, length as m-dash]N–) and amine (–NH–) groups, limiting the electrochemical redox of PANI. Herein, we proposed a simple protonation strategy to activate the redox couples of the PANI cathode for aqueous Zn batteries, during which the insulating [double bond, length as m-dash]N– groups are partially converted to the conductive emeraldine salt (polarons –NH+–), endowing PANI more active sites and enhanced conductivity. The A-PANI electrode realizes efficient transitions of leucoemeraldine/emeraldine and emeraldine/pernigraniline, achieving a high discharge capacity of 183 mA h g−1, long life span, and good energy density of 178 W h kg−1 at the power density of 680 W kg−1. These values are significantly superior to those of the original PANI electrode, indicating the high efficiency of the proposed strategy. This simple protonation method could be applicable for many electrochemical devices, such as supercapacitors, sensors, and batteries.

Graphical abstract: Protonating imine sites of polyaniline for aqueous zinc batteries

Supplementary files

Article information

Article type
Communication
Submitted
27 Du 2021
Accepted
07 Gen. 2022
First published
07 Gen. 2022

Chem. Commun., 2022,58, 1693-1696

Protonating imine sites of polyaniline for aqueous zinc batteries

H. Yan, X. Mu, Y. Song, Z. Qin, D. Guo, X. Sun and X. Liu, Chem. Commun., 2022, 58, 1693 DOI: 10.1039/D1CC06668D

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