A Novel Aqueous Asymmetric Supercapacitor based on Pyrene-4,5,9,10-Tetraone Functionalized Graphene as the Cathode and Annealed Ti3C2Tx MXene as the Anode
Artikel i vetenskaplig tidskrift, 2023

Asymmetric supercapacitors (ASCs), employing two dissimilar electrode materials with a large redox peak position difference as cathode and anode, have been designed to further broaden the voltage window and improve the energy density of supercapacitors. Organic molecule based electrodes can be constructed by combining redox-active organic molecules with conductive carbon-based materials such as graphene. Herein, pyrene-4,5,9,10-tetraone (PYT), a redox-active molecule with four carbonyl groups, exhibits a four-electron transfer process and can potentially deliver a high capacity. PYT is noncovalently combined with two different kinds of graphene (Graphenea [GN] and LayerOne [LO]) at different mass ratios. The PYT-functionalized GN electrode (PYT/GN 4–5) possesses a high capacity of 711 F g−1 at 1 A g−1 in 1 M H2SO4. To match with the PYT/GN 4–5 cathode, an annealed-Ti3C2Tx (A-Ti3C2Tx) MXene anode with a pseudocapacitive character is prepared by pyrolysis of pure Ti3C2Tx. The assembled PYT/GN 4–5//A-Ti3C2Tx ASC delivers an outstanding energy density of 18.4 Wh kg−1 at a power density of 700 W kg−1. The PYT-functionalized graphene holds great potential for high-performance energy storage devices.

energy storage

MXene

asymmetric supercapacitor

redox-active organic molecule

graphene

Författare

Mangmang Shi

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Cheng Peng

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Xiaoyan Zhang

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Small

1613-6810 (ISSN) 1613-6829 (eISSN)

Vol. 19 2301449-

Utnyttja Kovalent Kemi på Två-dimensionella Svart Fosfor Nanoflagor

Vetenskapsrådet (VR) (2020-04903), 2021-01-01 -- 2024-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Fundament

Grundläggande vetenskaper

Ämneskategorier

Materialkemi

Organisk kemi

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1002/smll.202301449

Mer information

Senast uppdaterat

2023-05-31