Polypyrrole/Carbon Nanotube Freestanding Electrode with Excellent Electrochemical Properties for High-Performance All-Solid-State Supercapacitors

Jincy Parayangattil Jyothibasu; Ming-Zhu Chen; Rong-Ho Lee

doi:10.1021/acsomega.9b04029

Polypyrrole/Carbon Nanotube Freestanding Electrode with Excellent Electrochemical Properties for High-Performance All-Solid-State Supercapacitors

ACS Omega. 2020 Mar 20;5(12):6441-6451. doi: 10.1021/acsomega.9b04029. eCollection 2020 Mar 31.

Authors

Jincy Parayangattil Jyothibasu^{1

2}, Ming-Zhu Chen¹, Rong-Ho Lee¹

Affiliations

¹ Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan.
² Department of Environmental Engineering, National Chung Hsing University, Taichung 402, Taiwan.

Abstract

In this study, a facile and environmentally friendly method was used to prepare a freestanding supercapacitor electrode displaying excellent areal capacitance and good cycle life performance. First, we prepared polypyrrole nanoparticles (PPyNP) through a simple in situ chemical polymerization using the plant-derived material curcumin as a bioavailable template. A PPyNP/f-CNT freestanding composite electrode of high mass loading (ca. 14 mg cm^-2) was prepared after blending the mixtures of the prepared PPyNP and functionalized CNTs (f-CNTs). The performance of the as-prepared material as a supercapacitor electrode was evaluated in a three-electrode setup using aqueous 1 M H₂SO₄ as the electrolyte. The PPyNP/f-CNT freestanding composite electrode exhibited a high areal capacitance of 4585 mF cm^-2 and a corresponding volumetric capacitance of 176.35 F cm^-3 at a current density of 2 mA cm^-2. A symmetric all-solid-state supercapacitor assembled using two identical pieces of PPyNP/f-CNT composite electrodes exhibited maximum areal energy and power density of 129.24 μW h cm^-2 and 12.5 mW cm^-2, respectively. Besides, this supercapacitor device exhibited good cycle life performance, with 79.03% capacitance retention after 10,000 charge/discharge cycles. These results suggest practical applications for these PPyNP/f-CNT freestanding composite electrode-based symmetric all-solid-state supercapacitors.