Rare Earth Ion-Doped α-MnO2Nanorods for an Asymmetric Supercapacitor

Mondal, D and Kundu, M and Paul, BK and Bhattacharya, D and Sarkar, S and Sau, S and Senapati, D and Mandal, TK and Das, S (2024) Rare Earth Ion-Doped α-MnO2Nanorods for an Asymmetric Supercapacitor. In: ACS Applied Nano Materials, 7 (5). pp. 4913-4926.

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Abstract

The limited electrical conductivity of manganese dioxide (MnO2) hinders its broad use as an electrode in all-solid-state supercapacitor devices (ASDs). To overcome this, trivalent gadolinium (Gd) and erbium (Er) ions are incorporated into MnO2, effectively addressing the issue. This involves synthesizing α-MnO2 nanorods infused with Gd and Er by using a modified chemical process. Through the creation of crystal defects, augmentation of electrical conductivity, and increased porosity, the electrochemical performance is significantly enhanced. Cyclic voltammetry and galvanostatic charge-discharge measurements within the range of �0.2 to +0.6 V unveil improved capacitance values of 798 and 647 F g�1 at 1 A g�1 current density for Gd- and Er-doped α-MnO2 respectively, maintaining 92.4 and 89.7 charge retention after 5000 cycles. Analysis reveals that both samples are primarily dominated by electric double-layer capacitance (EDLC). Furthermore, surface capacitance outweighs diffusion-controlled processes in the electrochemical storage mechanism. The Gd-doped α-MnO2 coated device depicts a peak energy density of 78.5 Wh kg-1 at 106.01 W kg-1 power density for 0.5 A g�1 and maximum power density of 498.1 W kg-1 at 9.13 Wh kg-1 energy density for 3 A g�1. Even a handcrafted 1 cm � 1 cm device achieves 2.252 V potential, effectively illuminating commercial LEDs. © 2024 American Chemical Society

Item Type:	Journal Article
Publication:	ACS Applied Nano Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Capacitance; Cyclic voltammetry; Electric conductivity; Electric discharges; Erbium; Gadolinium; Manganese oxide; Metal ions; Rare earths; Supercapacitor, Device fabrications; Electric double layer capacitance; Electrochemical performance; Fabrication technique; Gadolinia; High-performance device fabrication technique; Higher performance devices; Pseudo-electric double-layer capacitance contribution; Rare earth doped; Rare earth doped α-MnO2, Nanorods
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Jul 2024 07:10
Last Modified:	03 Jul 2024 07:10
URI:	http://eprints.iisc.ac.in/id/eprint/84532

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