Issue 12, 2023

Solid-state supercapacitors based on polyoxometalate-based crystalline materials modified with polyaniline

Abstract

Owing to the rapid advancement of electric energy and energy storage devices, there exists an urgent demand for solid-state supercapacitors that possess high capacitance and safety features. Polyoxometalate (POM)-based complexes are excellent candidates for electrode materials in the construction of solid-state SCs (SCs = supercapacitors), as they are capable of maintaining structural stability during the reversible redox reaction process. However, the poor conductivity of POM-based complexes cannot meet the requisite standards for solid-state SCs. In this study, two new POM-based complexes, H2{Co2Py4(H2O)4[Co2{Co[Mo6O12(OH)3(HPO4)(PO4)3]2}]}·4DMF·10H2O (1) and H6Py2[Mn2{Mn[Mo6O12(OH)3(HPO4)4]2}]·6DMF·4H2O (2) (Py = pyridine) were synthesised and the surface of POM-based electrodes were coated with a conductive polymer (PANI) via electrodeposition, resulting in a marked improvement in the transfer rates of electrolyte ions and electrons. The n@PANI-1 carbon paper electrodes were prepared and symmetrical solid-state capacitors (n@PANI-1-SCs) were assembled (in which n is the number of title complexes); their specific capacity could reach 58.166 mA h g−1 and 35.299 mA h g−1 at a current density of 0.2 A g−1. Moreover, the successful powering of the red LED for a duration of 0.5 min serves as a practical demonstration of the solid-state SC's feasibility. Our new findings may provide some inspiration to develop new solid-state SCs for wearable electronics.

Graphical abstract: Solid-state supercapacitors based on polyoxometalate-based crystalline materials modified with polyaniline

Supplementary files

Article information

Article type
Research Article
Submitted
09 mar 2023
Accepted
06 may 2023
First published
09 may 2023

Inorg. Chem. Front., 2023,10, 3641-3647

Solid-state supercapacitors based on polyoxometalate-based crystalline materials modified with polyaniline

C. Wang, Z. Gao, H. Zang, T. Dong and Z. Su, Inorg. Chem. Front., 2023, 10, 3641 DOI: 10.1039/D3QI00451A

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