Functional Nickel Oxide Nanostructures for Ethanol Oxidation in Alkaline Media

Abstract

Nickel oxide (NiO) nanostructures are employed in the basic medium for the oxidation of ethanol. A variety of NiO nanostructures are synthesized by wet chemical growth method, using different hydroxide (OH−) ion sources, particularly from ammonia, hexamethylenetetramine, urea and sodium hydroxide. The use of urea as (OH−) ion source results in flower‐like NiO structures composed by extremely thin nanowalls (thickness lower than 10 nm,), which demonstrated to be the most active for ethanol oxidation. All the samples exhibit NiO cubic phase, and no other impurity was detected. The cyclic voltammetry (CV) curves of NiO nanostructures were found linear over the concentration range 0.1–3.5 mM (R2=0.99) of ethanol, with the limit of detection estimated to be 0.013 mM for ethanol. The NiO nanostructures exhibit a selective signal towards ethanol oxidation in the presence of different members of alcohol family. The proposed NiO nanostructures showed a significant practicality for the reproducible and sensitive determination of ethanol from brandy, whisky, mixture of brandy and rum, and vodka samples. The nanomaterial was used as a surface modifying agent for the glassy carbon electrode and it showed a stable electro‐oxidation activity for the ethanol for 16 days. These findings indicate that the presented NiO nanomaterial can be applied in place of noble metals for ethanol sensing and other environmental applications (like fuel cells).

Synthesis of Carbon-Supported PdIrNi Catalysts and Their Performance towards Ethanol Electrooxidation

“…A similar conclusion was obtained regarding EOR on Ni(OH) 2 microspheres by Lidasan et al [55]. A further similar conclusion about NiO was obtained by Amin et al [56].The overall oxidation current of PdIrNi/C is lower than that of Pd/C. This could be due to the inactivity of Ir and Ni to ethanol oxidation while they occupy most of the PdIrNi/C near-surface layers.…”

Silky Co3O4 nanostructures for the selective and sensitive enzyme free sensing of uric acid

“…The limit of detection was measured according to the reported work. 49 The limit of detection of silky Co 3 O 4 nanostructures was found to be 0.1 mM.…”

“…The limit of detection was measured according to the reported work. 49 The limit of detection of silky Co 3 O 4 nanostructures was found to be 0.1 mM. It is notable that the selectivity is signicant parameter in the evaluation of performance of electrochemical method.…”

Anode Catalytic Activity of Palladium‐Nickel Alloy Nanoparticles for Ethanol Oxidation in Alkali

“…Notably, literature review reveals that Ni can oxidize ethanol at much higher potential than the studied potential. [44] The negatively shifted peak potential for Pd x Ni 100-x / C catalyst than Pd/C catalyst implies that incorporation of Ni in the Pd matrix makes it intrinsically good electro-catalyst. On the other hand, oxidation of carbonaceous intermediate that are not completely oxidised on the anodic scan along with freshly adsorbed ethanol molecule generates a peak (i b ) in the reverse scan.…”