A process to enhance the specific surface area and capacitance of hydrothermally reduced graphene oxide

Amira Alazmi; Omar El Tall; Shahid Rasul; Mohamed N Hedhili; Shashikant P Patole; Pedro M F J Costa

doi:10.1039/c6nr04426c

A process to enhance the specific surface area and capacitance of hydrothermally reduced graphene oxide

Nanoscale. 2016 Oct 20;8(41):17782-17787. doi: 10.1039/c6nr04426c.

Authors

Amira Alazmi¹, Omar El Tall², Shahid Rasul¹, Mohamed N Hedhili³, Shashikant P Patole¹, Pedro M F J Costa¹

Affiliations

¹ King Abdullah University of Science and Technology (KAUST), Physical Science and Engineering Division, Thuwal 23955-6900, Saudi Arabia. pedro.dacosta@kaust.edu.sa.
² King Abdullah University of Science and Technology (KAUST), Analytical Core Laboratory, Thuwal 23955-6900, Saudi Arabia.
³ King Abdullah University of Science and Technology (KAUST), Imaging and Characterization Laboratory, Thuwal 23955-6900, Saudi Arabia.

PMID: 27761538
DOI: 10.1039/c6nr04426c

Abstract

The impact of post-synthesis processing in reduced graphene oxide materials for supercapacitor electrodes has been analyzed. A comparative study of vacuum, freeze and critical point drying was carried out for hydrothermally reduced graphene oxide demonstrating that the optimization of the specific surface area and preservation of the porous network are critical to maximize its supercapacitance performance. As described below, using a supercritical fluid as the drying medium, unprecedented values of the specific surface area (364 m² g^-1) and supercapacitance (441 F g^-1) for this class of materials have been achieved.