Journal of The Electrochemical Society (J ELECTROCHEM SOC )

Publisher: Electrochemical Society, Electrochemical Society


The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 400 pages of 60 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal. Papers are selected by a prestigious editorial board and cover the following areas: Batteries and Energy Conversion, Corrosion, Passivation, and Anodic Films, Electrochemical/Chemical Deposition and Etching, Electrochemical Synthesis and Engineering, Physical and Analytical Electrochemistry, Dielectric Science and Materials, Semiconductor Devices, Materials, and Processing, Sensors and Displays: Principles, Materials, and Processing, Solid-State Topics: General, Review Papers in all of the above areas.

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    Journal of the Electrochemical Society
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Electrochemical Society

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Publications in this journal

  • Journal of The Electrochemical Society 11/2014; 161(11):F3164.
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    ABSTRACT: We have employed the rotating ring disk electrode (RRDE) technique to study the oxygen reduction reaction (ORR) on gold and glassy carbon cathodes in dimethyl sulfoxide (DMSO) electrolytes containing lithium salts. At the gold ring electrode at 3.0 V vs. Li/Li+ (0.1 M LiPF6) soluble superoxide radical anion undergoes oxidation to O2 under convective-diffusion conditions. For both glassy carbon and gold cathodes, typical oxygen reduction current-potential curves are sensitive to rotation speed and undergo a maximum and further electrode passivation by formation of Li2O2 while the Au ring electrode currents follow the same peak shape with detection of soluble superoxide at the ring downstream in the electrolyte solution. Unlike the behavior in acetonitrile lithium solutions, LiO2 is more stable in DMSO and can diffuse out in solution and be detected at the ring electrode. While in cyclic voltammetry both time and potential effects are convoluted, we have carried out RRDE Chrono-amperometric experiments at the disk electrode with detection of superoxide at the Au ring so that thus potential and time effects were clearly separated. The superoxide oxidation ring currents exhibit a maximum at 2.2 V due to the interplay of O2 formation by one-electron O2reduction,Li2O2disproportionation and two-electron O2reduction.
    Journal of The Electrochemical Society 10/2014; 161(14).
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    ABSTRACT: A model is presented for the contamination of a proton exchange membrane fuel cell (PEMFC), including adsorption onto the Pt catalyst, absorption into the membrane, and ion exchange with ionomeric components. Model predictions for three sources of voltage loss account for the two-dimensional, time-dependent contamination along the channel and into the membrane. The model is developed by considering the well-known concepts of Langmuir adsorption, partition coefficients, plug flow reactors (PFRs), and dimensionless analysis. The phenomena are shown to be controlled by three important dimensionless groups: a Damköhler number for the contamination reaction rate, a capacity ratio, and a coverage ratio for each contamination mechanism. These groups show how to scale ex situ equilibrium data for in situ predictions. The model predictions are shown to be reasonable when compared to in situ experiment data once ex situ data are used to provide reaction and equilibrium parameters. The predictions enable estimation of tolerance limits for leachates according to each mechanism. For typical parameters, the predicted voltage loss in the electrode ionomer by an ion-exchange mechanism shows slower reaction rates but greater performance losses than other mechanisms.
    Journal of The Electrochemical Society 10/2014; 161(14):F1375-F1388.
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    ABSTRACT: Here, we report the synthesis, structure and Li ion conductivity of new Sm-doped garnet-type Li5+2xLa3Nb2-xSmxO12 (0 ≤ x ≤ 0.7). Powder X-ray diffraction showed the formation of cubic garnet structure up to x = 0.3. Above x = 0.3 impurity phases were observed, due to LiNbO3 (the joint committee on powder diffraction standards (JCPDS) card No. 01-074-2239), LiSmO2 (JCPDS Card No. 01-073-1061) and Sm2O3 (JCPDS Card No. 15-0813). The cubic cell constant increased from 12.774(2) Å (x = 0) to 12.851(2) Å (x = 0.3). Scanning electron microscopy showed that Sm-doping results in an increase in density of the samples, as a result of improved particle-to-particle contact. Among the samples investigated, Li5.6La3Nb1.7Sm0.3O12, showed the highest conductivity of ∼10−5 S cm−1 at 24°C which is an order of magnitude higher than that of the parent compound, Li5La3Nb2O12. The activation energy in the temperature range 25–225°C decreased with an increase in Sm-dopant in Li5+2xLa3Nb2-xSmxO12 (0.45 eV for x = 0.05 to 0.38 eV for x = 0.3). Fourier transform infrared spectroscopy studies revealed the presence of Li2CO3 in both aged and fresh samples, while thermogravimetric analysis results showed that fresh samples exhibit a lower weight loss compared to the aged samples.
    Journal of The Electrochemical Society 10/2014; 161(14):A2060-A2067.
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    ABSTRACT: Oxygen solubility is the rate-determining step (RDS) for the reduction reaction on the cathodes of molten carbonate fuel cells (MCFCs), especially at low operating temperatures below 600◦C. The poor wetting property of the mixed ionic and electronic conductor (MIEC) coating, such as BYS (Bi1.5Y0.3Sm0.2O3-δ) on the NiO cathode, to the liquid electrolyte creates openings where oxygen absorption and dissociation take place to providemore oxide ionic species to electrochemical reaction sites (ERSs). Therefore, poor wetting MIEC-coated cells showed a much higher power density compared to standard cells, with a factor of 1.4 at the low operating temperature of 550◦C. Long-term operation of 2500 hours with a low voltage loss of 9 mV suggests that BYS is a promising alternative cathode material for molten carbonate fuel cells.
    Journal of The Electrochemical Society 10/2014; 161(14):F1-F10.
  • Journal of The Electrochemical Society 10/2014; 161(14):A2054.
  • Journal of The Electrochemical Society 09/2014; 161(14):F1330-F1339.
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    ABSTRACT: The conductivity and anodic stability of ternary mixed ionic liquid (IL) electrolytes consisting of pyrrolidinium [N-butyl-N-methylpyrrolidinium+ (PYR14+)] and imidazolium [1-butyl-3-methylimidazolium+ (BMIM+)] based bis(trifluoromethylsulfonyl) imide (TFSI-) with 0.5 M LiTFSI salt were investigated. PYR14TFSI ionic liquid has been reported to be stable under an oxidative environment, while BMIMTFSI provides good ionic conductivity. A conductivity study of IL electrolytes revealed a linear correlation of conductivity as a function of IL – Li salt concentration and IL volume fraction. As a result, improved battery cycling in a mixture of 4:1 (80/20 v/v %) BMIM+: PYR14+ was observed with a specific capacity of 330 mAh.g-1 over 50 cycles at a current density of 0.1 Also, an EIS study revealed decreasing cathode polarization by demonstrating lower impedance values for ternary mixed electrolyte than that of the pure electrolytes upon cycling.
    Journal of The Electrochemical Society 09/2014;
  • Journal of The Electrochemical Society 09/2014; 161(11):Y11-Y12.
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    ABSTRACT: Electrochemical dissolution of gold and platinum in 0.1 M HClO4, 0.1 M H2SO4, and 0.05 M NaOH is investigated. The qualitative picture of both metals’ dissolution is pH-independent. Oxidation/reduction of the metal's surface leads to the transient dissolution peaks which we label A1 and C1 on the dissolution profiles. Commencement of the oxygen evolution reaction (OER) results in the additional dissolution peak A2. Quantitatively, there are important differences. The amount of gold transiently dissolved in alkaline medium is more than an order of magnitude higher in comparison to that in acidic medium. Oppositely, steady-state gold dissolution in base in the potential region of OER is hindered. The transient dissolution of platinum is by a factor of two higher in base. It is suggested that variation of the pH does not change the mechanism of the OER on platinum. Consequently, the dissolution rate of platinum is equal in acidic and alkaline electrolytes. As an explanation of the observed difference in gold dissolution, a difference in the thickness of compact oxide formed in acid and base is suggested. Growth of a thicker compact oxide in the alkaline medium explains the increased transient and the decreased steady-state dissolution of gold.
    Journal of The Electrochemical Society 09/2014; 161(12):H822-H830.