Enhanced Electrochemical Ethanol Sensitivity on Ni/NiO‐rGO Hybrids Nanostructures at Room Temperature

Abstract

Herein, we depict that the consequential nickel/nickel oxidereduced graphene oxide (Ni/NiO-rGO) hybrid materials synthesized by sol-gel approach can give as competent electrocatalyst for oxidative determination of ethanol in alkaline condition. Ni/ NiO-rGO based electrochemical sensor shows rapid and highly sensitive linear sweep voltametric (LSV) response to ethanol at an ultra-low oxidation potential of 0.33 V vs. SCE. Moreover, the electrochemical sensor demonstrates highly stable (current and potential) also with low charge transfer resistance confirmed from chronoamperometic (i-t) and electrochemical impedance spectroscopic (EIS) data respectively towards ethanol oxidation at Ni/NiO-rGO hybrid interface confirms its acitivity over individuals i. e. Ni/NiO nanoparticles and rGO. Moreover, linear increase in current density upto 100 μM concentration of ethanol and for the scan rates in the range of 10-100 mV/s with positive shift in potential confirms ethanol oxidation is diffusion controlled process. The selective analysis of electrochemical response for ethanol in benadryl sample with same oxidation potential of ethanol beverages with enhanced ethanol oxidation potential for determination of ethanol concentration into benadryl sample analysis.

A comparative study of α-Ni(OH)2 and Ni nanoparticle supported ZIF-8@reduced graphene oxide-derived nitrogen doped carbon for electrocatalytic ethanol oxidation

“…15,16 Ni-based active sites promote the oxidation of the electroactive species via peroxide formation which enhances the conductivity, increases the active site number and develops the electron transfer from the modi-ed electrode to the electrolyte decreasing the reaction overpotential and facilitates catalytic activity. [17][18][19][20][21][22][23] Moreover, nickel hydroxides (Ni(OH) 2 ) have attracted great attention in electrochemical applications including supercapacitors, Ni-based alkaline batteries, and electrochemical sensors owing to their high stability under hard conditions. 24 The Ni(OH) 2 -based catalysts exhibit high electrocatalytic activity because they are oxidized to highly active nickel oxyhydroxide (NiOOH) species which can bond with the adsorbed species through empty or unpaired d-orbitals.…”

Deploying used solid carbon dioxide to assist graphite exfoliation

“…Two-dimensional graphene, containing a lattice of sp 2 carbons, has garnered much attention for its multiple applications in composite materials, energy storage devices, electrocatalysts, 1,2 sensors, 3 etc. 4–6 Additionally, extensive scientific and industrial research on the exfoliation of graphite/graphene into fewer sheets, is also being undertaken.…”

“…10,11 Exfoliation helps in improving the dispersibility of graphene in various solvents and facilitates the fabrication of composites/nanocomposites of graphene. Therefore, by exfoliating bulk graphene-based carbocatalysts 3,12,13 (graphite, graphene, graphene-oxide (GO), and reduced graphene-oxide (r-GO)) into fewer sheets, one can tune the surface properties and hence broaden the applications of graphene-based materials.…”