Excellent Oxygen Evolution Reaction of Activated Carbon-Anchored NiO Nanotablets Prepared by Green Routes

Nanomaterials
Sankar SekarSejoon Lee

Abstract

A sustainable and efficient electrocatalyst for the oxygen evolution reaction (OER) is vital to realize green and clean hydrogen production technology. Herein, we synthesized the nanocomposites of activated carbon-anchored nickel oxide (AC-NiO) via fully green routes, and characterized their excellent OER performances. The AC-NiO nanocomposites were prepared by the facile sonication method using sonochemically prepared NiO nanoparticles and biomass-derived AC nanosponges. The nanocomposites exhibited an aggregated structure of the AC-NiO nanotablets with an average size of 40 nm. When using the nanotablets as an OER catalyst in 1 M KOH, the sample displayed superb electrocatalytic performances, i.e., a substantially low value of overpotential (320 mV at 10 mA/cm2), a significantly small Tafel slope (49 mV/dec), and a good OER stability (4% decrease of overpotential after 10 h). These outstanding OER characteristics are considered as attributing to the synergetic effects from both the ample surface area of the electrochemically active NiO nanoparticles and the high electrical conductivity of the AC nanosponges. The results pronounce that the fully ecofriendly synthesized AC-NiO nanotablets can play a splendid role as high-perfor...Continue Reading

References

Jan 4, 2006·Angewandte Chemie·Jianling ZhangZhaofu Zhang
Feb 14, 2006·The Journal of Physical Chemistry. B·Abderrafik NemamchaDjameledine Khatmi
Feb 15, 2008·Nature·Thomas J Meyer
Apr 20, 2010·Advanced Materials·Jin Ho Bang, Kenneth S Suslick
May 31, 2012·The Journal of Physical Chemistry. a·David S HallBarry R MacDougall
Jan 14, 2017·Chemical Society Reviews·Nian-Tzu SuenHao Ming Chen

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Methods Mentioned

BETA
scanning electron microscopy
transmission electron microscopy
x-ray diffractometry
electron diffraction

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