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

Bulletin of materials science

Jahan Bakhsh Raoof²  Vahid Ehsani²  Fereshteh Chekin¹ 

[1] Ayatollah Amoli Branch, Department of Chemistry, Islamic Azad University, PO Box 678, Amol, Iran$$Ayatollah Amoli Branch, Department of Chemistry, Islamic Azad University, PO Box 678, Amol, IranAyatollah Amoli Branch, Department of Chemistry, Islamic Azad University, PO Box 678, Amol, Iran$$;Electroanalytical Chemistry Research Laboratory, Faculty of Chemistry, Department of Analytical Chemistry, Mazandaran University, Babolsar, Iran$$Electroanalytical Chemistry Research Laboratory, Faculty of Chemistry, Department of Analytical Chemistry, Mazandaran University, Babolsar, IranElectroanalytical Chemistry Research Laboratory, Faculty of Chemistry, Department of Analytical Chemistry, Mazandaran University, Babolsar, Iran$$

关键词: Cobalt oxide nanoparticles;    oxygen evolution reaction;    multiwall carbon nanotubes;    electrolysis.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A simple procedure was developed to prepare cobalt oxide nanoparticles (nano-CoO_�?) on multiwall carbon nanotube-modified glassy carbon electrode (MWNT/GCE). Scanning electron microscopy revealed the electrodeposition of nano-CoO_�? with an average particle size of 25 nm onto MWNT/GCE. Also, the presence of nano-CoO_�? was revealed by energy dispersive X-ray spectra. The electrocatalytic activity of nano-CoO_�? and MWNT composite-modified GCE (CoO_�?�?�MWNT/GCE) has been examined towards the oxygen evolution reaction (OER) by linear sweep voltammetry. The OER is significantly enhanced at CoO_�?�?�MWNT/GCE, as demonstrated by a negative shift in the polarization curves at the CoO_�?�?�MWNT/GCE compared with that obtained at the CoO_�?�?�GCE and GCE. Optimization of the operating experimental conditions (i.e., solution pH and loading level of nano-CoO_�?) has been achieved to maximize the electrocatalytic activity of CoO_�?�?�MWNT/GCE. The maximum electrocatalytic activity towards the OER was obtained in alkaline media (pH = 13). The electrocatalytic activity of CoO_�?�?�MWNT/GCE increased with the number of potential cycles employed for the CoO_�? deposition till a certain loading (20 cycles) beyond which an adverse effect is observed. The fabricated CoO_�?�?�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.

【 授权许可】

Unknown