Highly crystalline selectively oxidized graphene for supercapacitors
Journal article, 2023
Graphene oxide (GO) is usually regarded as a graphene precursor for scalable synthesis, mainly due to its aqueous processability from introducing oxygen functionalities. Nevertheless, the precise control of graphene's oxidation degree to obtain a good balance between dispersion stability and crystallinity remains challenging. This study describes a simple and practical approach to synthesize a new graphene-based material called selectively oxidized graphene (SOG), which combines the advantages of graphene and GO. SOG shows water stability of −36.2 mV, a C/O ratio of 5.2, and most importantly, a very high crystallinity degree, with an ID/IG of 0.414. The synthesized SOG exhibits an ultra-low optical band gap of 0.04 eV, 75 times lower than GO. Moreover, the electrical resistance, 1.12 KΩ/sq is nine orders of magnitude smaller than GO. Additionally, it also shows promising 3-electrode capacitance with an improvement above 400 % compared to exfoliated graphene. A Swagelok-based supercapacitor was fabricated to analyze the feasibility of SOG for energy storage applications, which exhibited remarkable characteristics such as ∼ 93F g−1 capacitance and ∼ 99.8 % retention after 10,000 cycles. The characteristics of SOG ensure that this new material is promising for applications in organic electronics.
Supercapacitors
Selectively Oxidized Graphene
Crystallinity
2D Materials
Chemical Properties
Author
Abraham Méndez-Reséndiz
(CIMAV)
Centro de Investigacion en Materiales Avanzados
Ulises Mendez Romero
Centro de Investigacion en Materiales Avanzados
(CIMAV)
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Ricardo Antonio Mendoza-Jiménez
(CIMAV)
Centro de Investigacion en Materiales Avanzados
Birhan Alkadir Abdulahi
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Wollo University
Sergio Alfonso Pérez-García
Centro de Investigacion en Materiales Avanzados
(CIMAV)
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
L. Licea-Jiménez
(CIMAV)
Centro de Investigacion en Materiales Avanzados
FlatChem
24522627 (eISSN)
Vol. 38 100483Subject Categories
Inorganic Chemistry
Materials Chemistry
Other Chemistry Topics
DOI
10.1016/j.flatc.2023.100483