Methanol Electrooxidation at Electrodes Made of Exfoliated Graphite/Nickel/Palladium Composite

Abstract

This paper try to answer the question, if the exfoliated graphite/nickel/palladium (EG/Ni/Pd) composite can be regarded as a potential anode material in direct methanol fuel cells (DMFCs). For this purpose, process of electrochemical oxidation of methanol on electrode made of EG/Ni/Pd was investigated. Electrochemical investigations were conducted in alkaline medium by cyclic voltammetry and potentiostatic techniques. Informations on catalytic activity of the examined composite were acquired from the comparison of current charges calculated for methanol oxidation peaks. The investigations revealed that electrochemical activity of EG/Ni/Pd composite enhances along the potential cycling. Current charges of methanol oxidation peaks increase with number of conducted cycles up to 26th cycle. The increment in electrochemical activity impacts on the decline in methanol concentration in the investigated electrolyte. The results of electrochemical investigations for EG/ Ni/Pd composite were compared to that acquired for EG/Pd. The difference in total organic carbon (TOC) before and after the selected cycles of electrochemical process at EG/Ni/Pd electrode were the source of information on degree of methanol oxidation. Process comprised of 50 cycles of methanol electrooxidation resulted over 50% decrease in its concentration. The interpretation of electrochemical investigations were supported by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) analysis.

Multifunctional ternary ZnMgFe LDH as an efficient adsorbent for ceftriaxone sodium and antimicrobial agent: sustainability of adsorption waste as a catalyst for methanol electro-oxidation

“…Based on these results, the methanol concentration in KOH as the electrolyte is reduced to 25% after 40 cycles owing to the electrochemical activity of the spent ZnMgFe LDH/CTX electrode which confirms its oxidation into inorganic carbon. 72…”

“…Based on these results, the methanol concentration in KOH as the electrolyte is reduced to 25% aer 40 cycles owing to the electrochemical activity of the spent ZnMgFe LDH/CTX electrode which conrms its oxidation into inorganic carbon. 72 The possible mechanism of methanol electro-oxidation over ZnMgFe LDH/CTX is illustrated in Scheme 3. The role of LDH electro-catalysts in methanol oxidation is still not fully understood.…”

Recent Developments of Methanol Electrooxidation Using Nickel‐based Nanocatalysts

“…The resultant ternary electrode recorded 50 % decrease in MeOH concentration on subjecting to 50 electrooxidation cycles. Further, this electrode demonstrated superior electrochemical activity relative to similarly prepared binary exfoliated graphite/palladium nanocomposite electrode clearing stating the important role of nickel in dictating the kinetics of MeOH electrooxidation reaction too [165] …”

“…Further, this electrode demonstrated superior electrochemical activity relative to similarly prepared binary exfoliated graphite/ palladium nanocomposite electrode clearing stating the important role of nickel in dictating the kinetics of MeOH electrooxidation reaction too. [165] The exciting electrocatalytic properties of mixed oxide NiCo 2 O 4 spinels have driven their usage in designing suitable ternary nanocomposite electrocatalysts for MeOH electrooxidation and accordingly various carbon supports have been experimented to upgrade their electrocatalytic activities as discussed below. In the recent past, Ko et.…”

Effect of Anode Material on Electrochemical Oxidation of Low Molecular Weight Alcohols—A Review

“…Due to their low-cost, stable physical properties, large surface areas and good conductivity, carbon materials, such as reduced graphene oxide (rGO) [ 13 , 50 , 51 ], graphene nanosheets (GNS) [ 13 ], carbon nanotubes (CNTs) [ 13 , 50 ], multiwalled carbon nanotubes (MWCNTs) [ 13 , 52 , 53 , 54 ], functionalized mesoporous carbon [ 13 ], exfoliated graphite (EG) [ 55 , 56 ], pyrolytic graphite [ 54 ] and glassy carbon (GC) [ 57 , 58 , 59 ] are widely used as catalyst support materials for the electrooxidation of low molecular weight organic compounds, such as methanol, ethanol and propanol.…”