Molybdenum electrodes for hydrogen production by water electrolysis using ionic liquid electrolytes

Souza, Roberto Fernando de; Loget, Gabriel; Padilha, Janine Carvalho; Martini, Emilse Maria Agostini; Souza, Michèle Oberson de

doi:10.1016/j.elecom.2008.08.029

Cited by 47 publications

(33 citation statements)

References 17 publications

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“…There was no active zone recorded in the anodic potential range, indicating the passivity of the electrode. The anodic current, which was constant with increases in potential, probably has mainly a capacitive contribution since the BMI.BF 4 electrochemical window is within the 4-6 V range when Pt electrodes are used [9]. As the amount of IL increases, the passive current increases, although less than in EG-H 2 O systems.…”

Section: Resultsmentioning

confidence: 98%

“…These problems encourage investigations devoted to the development of non-aqueous electrolytes with high conductivity [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The key characteristics of ionic liquids are high decomposition voltage limits, wide ranges of operational temperatures, high ionic conductivities, non-corrosive nature [2], and making them attractive alternatives to water.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behavior of aluminum in 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid electrolytes for capacitor applications

Trombetta

Souza

et al. 2009

J Appl Electrochem

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This study compares two series of solvents for application in aluminum electrolytic capacitors: ethylene glycol (EG) and water mixtures, and ethylene glycol and 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF 4 ) ionic liquid (IL) mixtures. Electrochemical impedance spectroscopy and cyclic voltammetry were carried out with a previously anodized aluminum disk electrode. Comparative measurements of solution resistance, polarization resistance, AC capacitance, and passive current were made. The results show that EG-IL mixtures with low amounts of IL (10% IL-90% EG v/v) have a low solution resistance. Low values of solution resistance, high values of polarization resistance, small passive current, and uniform capacitance of anodized aluminum in EG-IL mixtures are favorable properties of the BMI.BF 4 IL for use as an electrolyte in the construction of electrolytic aluminum capacitors.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of aluminum in 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid electrolytes for capacitor applications

Trombetta

Souza

et al. 2009

J Appl Electrochem

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“…For example, Mo showed current density values that were three times better than Pt and efficiencies of ca. 98% [16,17]. This superior performance is due to the reduced activation energy in the hydrogen evolution reaction (HER) with the Mo electrode, but the explanation for the decrease in this activation energy still remains an open question.…”

Section: Introductionmentioning

confidence: 96%

Study of molybdenum electrodes for hydrogen evolution reaction

Padilha

Martini

Brum

et al. 2009

Journal of Power Sources

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a b s t r a c tThe molybdenum electrode, Mo, has been investigated for hydrogen production via water electrolysis in 10 vol.% aqueous solutions of 1-butyl-3-methylimidazolium tetrafluoroborate (BMI·BF 4 ) using electrochemical impedance spectroscopy (EIS). The EIS measurements show that the Mo system has much higher interfacial capacitance, and correspondently the electrical double layer formed on this electrode is thicker than those formed on nickel or platinum. The positive displacement of potential of zero charge (PZC) values indicates the specific adsorption of the imidazolium cation on the Mo surface. This study provides an elegant explanation for the better performance of Mo electrodes in the hydrogen evolution reaction (HER): the BMI cation acts as an intermediate for the proton transfer from water to the electrode surface, thereby decreasing the overpotential of HER. This model explains the synergism between Mo and the BMI cation in the HER process.

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“…Hydrogen is very popular for a number of reasons: it is perceived as a clean fuel because, the reaction of hydrogen with oxygen produces the water vapor which is not an atmosphere pollutant [3]; it can be produced using any energy sources, with renewable energy being most attractive; it works with fuel cells and together, it may serve as one of the solutions to the sustainable energy supply [4][5][6][7]. It is produced by the means of gasification [8,9], biochemical process [10,11] and electrolysis techniques [12][13][14][15][16]. The gasification realizes between the range of 800-2000 • C and 40 atm a pressure also process efficiency is 55% that low reaction completion grade.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic behaviour of NiBi coatings for hydrogen evolution reaction in alkaline medium

Mert

Kardaş

2011

Journal of Alloys and Compounds

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Molybdenum electrodes for hydrogen production by water electrolysis using ionic liquid electrolytes

Cited by 47 publications

References 17 publications

Electrochemical behavior of aluminum in 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid electrolytes for capacitor applications

Electrochemical behavior of aluminum in 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid electrolytes for capacitor applications

Study of molybdenum electrodes for hydrogen evolution reaction

Electrocatalytic behaviour of NiBi coatings for hydrogen evolution reaction in alkaline medium

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