کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1276173 | 1497489 | 2014 | 9 صفحه PDF | دانلود رایگان |
• Noble metal-free nickel oxide (NiOx) for efficient water oxidation.
• Carbon nanotubes supported NiOx improves catalytic current density.
• NiOx is facilely electrodeposited with porous, honeycomb-like structure.
• High Faradaic efficiency.
• Low overpotentials for water oxidation.
Herein we report for the first time to use multi-walled carbon nanotubes (MWCNTs) supported porous nickel oxide (NiOx) as non-precious electrocatalysts for oxidation of water at low overpotentials. The nickel oxide catalyst was facilely electrodeposited on MWCNTs in a 0.1 M KBi buffered solution at pH 9.2 containing 0.1 mM Ni2+ with an applied anodic potential. The current density of bulk electrolysis is 2.2 mA/cm2 at +1.1 V (vs Ag/AgCl) using NiOx-MWCNTs as the working electrode at pH 9.2, which is much higher than that in a system containing no MWCNTs. Tafel plot indicates that the present NiOx-MWCNTs catalyst requires the overpotential of only 200 mV to catalyze the water oxidation reaction at pH 9.2. The Faradaic efficiency of >95% has been achieved at +1.1 V. The highly porous character of the NiOx catalyst materials were further studied by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray analysis (EDX).
Highly porous NiOx was facilely electrodeposited on multi-walled carbon nanotubes for catalytic water oxidation at low overpotentials under the weak basic condition.Figure optionsDownload as PowerPoint slide
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 20, 3 July 2014, Pages 10467–10475