Cobalt oxide nanoparticle-modified carbon nanotubes as an electrocatalysts for electrocatalytic evolution of oxygen gas

被引:0
|
作者
JAHAN BAKHSH RAOOF
FERESHTEH CHEKIN
VAHID EHSANI
机构
[1] Mazandaran University,Electroanalytical Chemistry Research Laboratory, Faculty of Chemistry, Department of Analytical Chemistry
[2] Islamic Azad University,Ayatollah Amoli Branch, Department of Chemistry
来源
Bulletin of Materials Science | 2015年 / 38卷
关键词
Cobalt oxide nanoparticles; oxygen evolution reaction; multiwall carbon nanotubes; electrolysis;
D O I
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中图分类号
学科分类号
摘要
A simple procedure was developed to prepare cobalt oxide nanoparticles (nano-CoOx) on multiwall carbon nanotube-modified glassy carbon electrode (MWNT/GCE). Scanning electron microscopy revealed the electrodeposition of nano-CoOx with an average particle size of 25 nm onto MWNT/GCE. Also, the presence of nano-CoOx was revealed by energy dispersive X-ray spectra. The electrocatalytic activity of nano-CoOx and MWNT composite-modified GCE (CoOx–MWNT/GCE) has been examined towards the oxygen evolution reaction (OER) by linear sweep voltammetry. The OER is significantly enhanced at CoOx–MWNT/GCE, as demonstrated by a negative shift in the polarization curves at the CoOx–MWNT/GCE compared with that obtained at the CoOx–GCE and GCE. Optimization of the operating experimental conditions (i.e., solution pH and loading level of nano-CoOx) has been achieved to maximize the electrocatalytic activity of CoOx–MWNT/GCE. The maximum electrocatalytic activity towards the OER was obtained in alkaline media (pH = 13). The electrocatalytic activity of CoOx–MWNT/GCE increased with the number of potential cycles employed for the CoOx deposition till a certain loading (20 cycles) beyond which an adverse effect is observed. The fabricated CoOx–MWNT/GCE exhibited a good stability and durability. The value of energy saving per gram of oxygen gas at a current density of 10 mA cm−2 is 19 .3 kWh kg−1.
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页码:135 / 140
页数:5
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