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Bilayered microelectrodes based on electrochemically deposited MnO₂/polypyrrole towards fast charge transport kinetics for micro-supercapacitors.

ABSTRACT: Micro-supercapacitors (MSCs) are promising power solution facilities for miniaturized portable electronic devices. Microfabrication of on-chip MSC with high specific capacitance and high energy density is still a great challenge. Herein, we report a high-performance MnO₂/polypyrrole (PPy) microelectrode based MSC (MnO₂/PPy-MSC) by modern micromachining technology. Interdigital Au micro current collectors were obtained by photolithography, physical vapor deposition and lift off. A layer of PPy was electrochemically deposited on Au current collectors followed by deposition of urchin-like MnO₂ micro/nanostructures. The electrochemical performance of MnO₂/PPy-MSC was explored employing LiClO₄/PVA gel electrolyte. The assembled MSC demonstrated a high areal capacitance of 13 mF cm^-2, an energy density of 1.07 × 10^-3 mW h cm^-2 and a power density of 0.53 mW cm^-2. In addition, the MnO₂/PPy-MSC showed an improved cycling stability, retaining 84% of the initial capacitance after 5000 CV cycles at a scan rate of 500 mV s^-1. Our proposed strategy provides a versatile and promising method for the fabrication of high-performance MSCs with large-scale applications.

SUBMITTER: Haider WA

PROVIDER: S-EPMC9053735 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Bilayered microelectrodes based on electrochemically deposited MnO2/polypyrrole towards fast charge transport kinetics for micro-supercapacitors.

Haider Waqas Ali WA He Liang L Mirza Hameed A HA Tahir Muhammad M Tahir Muhammad M Khan Aamir Minhas AM Owusu Kwadwo Asare KA Yang Wei W Wang Zhuqing Z Mai Liqiang L

RSC advances 20200513 31

Micro-supercapacitors (MSCs) are promising power solution facilities for miniaturized portable electronic devices. Microfabrication of on-chip MSC with high specific capacitance and high energy density is still a great challenge. Herein, we report a high-performance MnO2/polypyrrole (PPy) microelectrode based MSC (MnO2/PPy-MSC) by modern micromachining technology. Interdigital Au micro current collectors were obtained by photolithography, physical vapor deposition and lift ...[more]

PMID: 35517224

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Project description:Flexible electrochemical supercapacitors (FESCs) are emerging as innovative energy storage systems, characterized by their stable performance, long cycle life, and portability/foldability. Crucial components of FESCs, such as electrodes and efficient electrolytes, have become the focus of extensive research. Herein, we examine deep eutectic solvent (DES)-based polymer gel systems for their cost-effective accessibility, simple synthesis, excellent biocompatibility, and exceptional thermal and electrochemical stability. We used a mixture a DES, LiClO4-2-Oxazolidinone as the electroactive species, and a polymer, either polyvinyl alcohol (PVA) or polyacrylamide (PAAM) as a redox additive/plasticizer. This combination facilitates a unique ion-transport process, enhancing the overall electrochemical performance of the polymer gel electrolyte. We manufactured and used LiClO4-2-Oxazolidinone (LO), polyvinyl alcohol-LiClO4-2-Oxazolidinone (PVA-LO), and polyacrylamide-LiClO4-2-Oxazolidinone (PAAM-LO) electrolytes to synthesize an MnO2 symmetric FESC. To evaluate their performance, we analyzed the MnO2 symmetric FESC using various electrolytes with cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The FESC featuring the PVA-LO electrolyte demonstrated superior electrochemical and mechanical performances. This solid-state MnO2 symmetric FESC exhibited a specific capacitance of 121.6 F/g within a potential window of 2.4 V. Due to the excellent ionic conductivity and the wide electrochemical operating voltage range of the PVA-LO electrolyte, a high energy density of 97.3 Wh/kg at 1200 W/kg, and a long-lasting energy storage system (89.7% capacitance retention after 5000 cycles of GCD at 2 A/g) are feasibly achieved. For practical applications, we employed the MnO2 symmetric FESCs with the PVA-LO electrolyte to power a digital watch and a light-emitting diode, further demonstrating their real-world utility.

Dataset Information

Bilayered microelectrodes based on electrochemically deposited MnO₂/polypyrrole towards fast charge transport kinetics for micro-supercapacitors.

Publications

Bilayered microelectrodes based on electrochemically deposited MnO<sub>2</sub>/polypyrrole towards fast charge transport kinetics for micro-supercapacitors.

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