Electrochemical energy storage in an organic supercapacitor via a non-electrochemical proton charge assembly

Abstract

Contrary to the conventional beliefs, we show how a ligand functionality that do not exhibit any redox activity, elevate the charge storage capability of the electric double layer via a...

A Molecular Adsorption Concept for Increasing Energy Density of Hybrid Supercapacitors

“…29,45 Furthermore, there are some reports about high energy density capacitors realized by immobilization of metal Pcs with chemically modified peripheral groups onto CNTs. 32,46 But they increased their capacities due to only the mixing of aggregates. Therefore, the baseline of CV increased, and no clear redox peaks were observed.…”

“…This value is quite high compared with previously reported supercapacitors using polyaniline-coated carbon nanofibers or CNTs (c.a. 240 F/g@1 A/g) , and metal Pcs and polyaniline modified CNTs (278–325 F/g@10 A/g). , Furthermore, there are some reports about high energy density capacitors realized by immobilization of metal Pcs with chemically modified peripheral groups onto CNTs. , But they increased their capacities due to only the mixing of aggregates. Therefore, the baseline of CV increased, and no clear redox peaks were observed.…”

“…Recently, redox-active organometallic complexes have received much attention as alternatives for those metal oxides. − In particular, metal phthalocyanine materials can store charge through the redox of their complexed metals and allow for the introduction of various functional groups due to the possibility of molecular structure design. − High-capacity capacitors have been reported using electrodes mixed with redox-active functional groups introduced into metal phthalocyanine molecules, or further mixed with redox-active polymers such as polyaniline …”

“…25−28 In particular, metal phthalocyanine materials can store charge through the redox of their complexed metals and allow for the introduction of various functional groups due to the possibility of molecular structure design. 29−31 Highcapacity capacitors have been reported using electrodes mixed with redox-active functional groups introduced into metal phthalocyanine molecules, 32 or further mixed with redox-active polymers such as polyaniline. 33 We have reported the azaphthalocyanine unimolecular layer (AZUL) catalyst, which realizes an electrochemical catalyst with high oxygen reduction reaction (ORR) activity by metal azaphthalocyanine, which has higher solubility in organic solvents compared to regular metal phthalocyanine, adsorbed on the surface of high specific surface area carbons like carbon black in solution.…”

Metal-free platforms for molecular thin films as high-performance supercapacitors

“…1–6 To meet ever-expanding energy storage requirements, the number of organic supercapacitor (OSC) devices has been expanding, but it is vital to elevate the energy density and power density. 7–12 Excellent synthetic flexibility, light weight, low production cost, tunable electrical conductivity, porosity, sustainable organic electrodes, and easy fabrication under ambient conditions make organic supercapacitors suitable for advanced technological solutions for storing electrical energy in different forms. 13–17 Heteroatoms (N, P, O, S), due to their relatively larger electronegativity than carbon, increase surface wettability, alter the Fermi energy ( E F ), and enhance capacitive performance upon functionalization on carbon electrodes.…”