Functional Porous Carbon/Nickel Oxide Nanocomposites as Binder‐Free Electrodes for Supercapacitors |
| |
| Authors: | Prof?Dr Shen‐Ming Chen Dr Pitchaimani Veerakumar Prof?Dr Shang‐Bin Liu |
| |
| Affiliation: | 1. Electroanalysis and Bioelectrochemistry Lab, Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10617 (Taiwan), Fax: (+886)?2‐27025238;2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617 (Taiwan), Fax: (+886)?2‐23620200;3. Department of Chemistry, National Taiwan Normal University, Taipei 11677 (Taiwan) |
| |
| Abstract: | High‐surface‐area, guava‐leaf‐derived, heteroatom‐containing activated carbon (GHAC) materials were synthesized by means of a facile chemical activation method with KOH as activating agent and exploited as catalyst supports to disperse nickel oxide (NiO) nanocrystals (average size (2.0±0.1) nm) through a hydrothermal process. The textural and structural properties of these GHAC/NiO nanocomposites were characterized by various physicochemical techniques, namely, field‐emission SEM, high‐resolution TEM, elemental analysis, X‐ray diffraction, X‐ray photoelectron spectroscopy, thermogravimetric analysis, and Raman spectroscopy. The as‐synthesized GHAC/NiO nanocomposites were employed as binder‐free electrodes, which exhibited high specific capacitance (up to 461 F g?1 at a current density of 2.3 A g?1) and remarkable cycling stability, which may be attributed to the unique properties of GHAC and excellent electrochemical activity of the highly dispersed NiO nanocrystals. |
| |
| Keywords: | biomass carbon electrochemistry nanostructures nickel |
|
|
