Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5146415 | International Journal of Hydrogen Energy | 2017 | 9 Pages |
Abstract
In this work, cobalt hydroxide nanoparticles are simply synthesized (size is about 50 nm) and deposited on the reduced graphene oxide nanoflake by the hydrothermal method. Then, the ability of glassy carbon electrode modified with this low-cost nanocomposite is examined as a supercapacitor and oxygen evolution electrocatalysts in 2.0 mol Lâ1 KOH by a three-electrode system. The modified electrode as a pseudocapacitor with potential windows of 0.35 V, exhibits a powerful specific capacitance (235.20 F gâ1 at 0.1 A gâ1 current density), energy density, stability (about 90% of the initial capacitance value maintain after 2000 cycles at 1.0 A gâ1) and fast charge/discharge ability. Furthermore, the modified electrode displays a good electrocatalytic activity for oxygen evolution reaction with a current density of 10.0 mA cmâ2 at 1.647 V, small Tafel slope of 56.5 mV decâ1, good onset potential of 1.521 V vs. RHE and suitable durability.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Behzad Rezaei, Ahmad Reza Taghipour Jahromi, Ali Asghar Ensafi,