Nickel-modified manganese oxide as an active electrocatalyst for oxidation of methanol in fuel cells

Samant, Purnakala; Fernandes, Julio B.

doi:10.1016/s0378-7753(99)00043-9

Cited by 62 publications

(24 citation statements)

References 8 publications

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“…Although the study of the apparently complex mechanism of the electrochemical reaction is important and may provide guidance to the design of suitable new catalysts [3][4][5][6], the modification of the existing known active surfaces [7][8][9][10] can be a promising short-cut. In this regard alloying and underpotential deposition of modifiers onto a catalytic surface [11,12] have been tried in attempts to reduce the seemingly high overpotential associated with the process as well as to overcome the possible impeding effects of the adsorbed intermediates [13].…”

Section: Introductionmentioning

confidence: 99%

“…A great deal of interest has recently been focused on the use of non-noble transition metals in alkaline media [14][15][16][17] where less expensive members, copper and nickel, and their modified surfaces have received special attention [18][19][20]. Both copper and nickel have been reported to effectively catalyze the electro-oxidation of alcohols [7][8][9][10]16] in general and methanol [21] in particular besides the number of other organics that they electrocatalyze in anodic [22,23] and cathodic reactions. According to the thermodynamic data, copper does not undergo redox processes in the potential range of nickel's electro-activity [24] and modification of nickel by copper has been shown [25,26] to enhance its electro-catalytic activity in methanol electro-oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Electro-Catalytic Oxidation of Methanol on a Ni–Cu Alloy in Alkaline Medium

et al. 2006

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The electro-catalytic oxidation of methanol on a Ni-Cu alloy (NCA) with atomic ratio of 60/40 having previously undergone 50 potential sweep cycles in the range 0-600 mV vs. (Ag/AgCl) in 1 M NaOH was studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (EIS). The electro-oxidation was observed as large anodic peaks both in the anodic and early stages of the cathodic direction of potential sweep around 420 mV vs. (Ag/AgCl). The electro-catalytic surface was at least an order of magnitude superior to a pure nickel electrode for methanol oxidation. The diffusion coefficient and apparent rate constant of methanol oxidation were found to be 2.16 Â 10 )4 cm 2 s )1 and 1979.01 cm 3 mol )1 s )1 , respectively. EIS studies were employed to unveil the charge transfer rate as well as the electrical characteristics of the catalytic surface. For the electrochemical oxidation of methanol at 5.0 M concentration, charge transfer resistance of nearly 111 W was obtained while the resistance of the electro-catalyst layer was ca. 329 W.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electro-Catalytic Oxidation of Methanol on a Ni–Cu Alloy in Alkaline Medium

et al. 2006

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“…The electrochemical oxidation of methanol is a complicated process that affects the performance of the cell due to its poisoning of the Pt active sites (Jarvis et al, 1998). Concerning the mechanistic studies and kinetics of methanol oxidation, several investigations were also performed with Pt or Ni on modified electrodes (Samant and Femandes, 1999;Golikand et al, 2006a;Golikand et al, 2005), Pt-Ru or Ni-Cu alloys (Schmidt et al, 1999;Jafarian et al, 2006), nickel or cobalt hydroxides modified glassy carbon electrodes (El-Shafei, 1999;Jafarian et al, 2003). Moreover, different complexes of nickel such as Ni II -salen ( Trevin, 1997), Ni II -tetraazamacrocyclic complexes (Roslonek and Taraszewska, 1992), Ni II -curcumin (Ciszewski, 1995), Ni II -tetrakis(3-methoxy-4-hydroxyphenyl)porphyrin (Ciszewski and Milczarek, 1996) or Ni IIhematoporphyrin IX (Golabi and Golikand, 2004) have been studied as modifying agents in alkaline media yielding polymeric films at the electrode surface of glassy carbon.…”

Section: Introductionmentioning

confidence: 99%

Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5,5′-dihydroxysalen] onto indium tin oxide surface and study of their electrocatalytic behavior toward aliphatic alcohols

Ourari

Ketfi

Zerroual

2017

Arabian Journal of Chemistry

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Please cite this article as: A. Ourari, B. Ketfi, L. Zerroual, Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5, 5'-dihydroxySalen] onto indium tin oxide surface and study of their electrocatalytic behavior towards aliphatic alcohols, Arabian Journal of Chemistry (2014), doi: http:// dx.Abstract Nickel (II)-DHS Complex was obtained from N,N'-bis(2,5-dihydroxybenzylidene)-1,2-diaminoethane (H 2 DHS) ligand and nickel acetate tetrahydrated in ethanolic solution with stirring under reflux. This complex, dissolved in an alkaline solution, was oxidized to form electroactive films strongly adhered on the ITO (Indium tin oxide) electrode surface. In this alkaline solution, the poly-[Ni II -DHS]/ITO films showed the typical voltammetric response of (Ni 2+ /Ni 3+ ) redox couple centers which are immobilized in the polymer-film. The modified electrodes (MEs) obtained were also characterized by several techniques such as scanning electronic microscopy, atomic force microscopy and electrochemical methods. The electrocatalytic behavior of these MEs towards the oxidation reaction of some aliphatic alcohols such as methanol, ethanol, 2-Methyl-1-propanol and isopropanol was investigated.The voltammograms recorded with these alcohols showed a good electrocatalytic efficiency.The electrocatalytic currents were at least 80 times higher than those obtained for the oxidation of methanol on electrodes modified with nickel hydroxide films in alkaline solutions. We noticed that these electrocatalytic currents are proportional to the concentration of methanol (0.050 to 0.30 µM). In contrast, those recorded for the oxidation of other aliphatic short chain alcohols such as ethanol, 2-Methyl-1-propanol and isopropanol are rather moderately weaker. In all cases the electrocatalytic currents presented a linear dependence with the concentration of alcohol. These modified electrodes could be applied as alcohol sensors.

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“…Of late, numerous attempts have been made to prepare other catalysts, not based on Pt. These were found to have a good promoting effect for methanol oxidation, e.g., iron-ruthenium modified activated carbon [15] and nickelmodified manganese oxide [19].…”

Section: Introductionmentioning

confidence: 99%

Graphite Electrodes Modified with Platinum‐Nickel Nano‐Particles for Methanol Oxidation

2007

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Methanol electro‐oxidation is investigated at graphite electrodes modified with various platinum and nickel nano‐particle deposits using cyclic voltammetry. The modified electrodes are prepared by the simultaneous electrodeposition of metals from their salt solutions using potentiostatic and galvanostatic techniques. They show enhanced catalytic activity towards methanol oxidation in KOH solution. The catalytic activity of platinum nano‐particles is found to be significantly affected by the presence of relatively small amounts of nickel deposits. A comparison is made between the electrocatalytic activity of Pt/C and (Pt‐Ni)/C electrodes. The results show that the methanol electro‐oxidation current increases with an increase in the nickel content. In particular, the highest catalytic activity is achieved for platinum to nickel deposits of 95%:5% (wt.‐%), in other cases the catalytic activity decreases. It is found that Ni enhances the catalytic activity of Pt by increasing the number of active sites, as well as through an electron donation process from Ni to Pt. This process takes place once the nickel hydroxide (Ni(OH)2)/nickel oxy‐hydroxide (NiOOH) transformation begins. The effect of the methanol concentration on the methanol oxidation reaction is investigated. The order of reaction, with respect to methanol, at the modified (Pt‐Ni)/C electrode is found to be 0.5.

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Nickel-modified manganese oxide as an active electrocatalyst for oxidation of methanol in fuel cells

Cited by 62 publications

References 8 publications

Electro-Catalytic Oxidation of Methanol on a Ni–Cu Alloy in Alkaline Medium

Electro-Catalytic Oxidation of Methanol on a Ni–Cu Alloy in Alkaline Medium

Elaboration of modified poly(Ni II -DHS) films as electrodes by the electropolymerization of Ni(II)-[5,5′-dihydroxysalen] onto indium tin oxide surface and study of their electrocatalytic behavior toward aliphatic alcohols

Graphite Electrodes Modified with Platinum‐Nickel Nano‐Particles for Methanol Oxidation

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