Electrochemistry of the Nickel Electrode as a Cathode Catalyst in the Media of Acidic Peroxide for Application of the Peroxide Fuel Cell

Sanlı, Ays ̧e Elif; Aytaç, Aylin

doi:10.1149/1.4705474

Cited by 16 publications

(10 citation statements)

References 16 publications

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“…The last puzzle is to understand the origin of the accelerated dissolution of base metals especially of Mo in the presence of ILs. In aqueous medium, an insoluble passive oxide film tends to form on surfaces of transition metals including Ni and Mo − under anodic polarization conditions . The passive oxide film can prevent further oxidation or dissolution of these metals even in acidic electrolyte as observed on pristine PtNiMo/C, on which the dissolution amounts of both Ni and Mo are less than 10% after the ADT.…”

Section: Resultsmentioning

confidence: 99%

Effect of Ionic Liquid Modification on the ORR Performance and Degradation Mechanism of Trimetallic PtNiMo/C Catalysts

et al. 2019

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Ionic liquids (ILs) modification, following the concept of “solid catalyst with ionic liquid layer (SCILL)”, has been demonstrated to be an effective approach to improving both activity and stability of Pt-based catalysts for the oxygen reduction reaction. In this work, the SCILL concept has been applied to a trimetallic PtNiMo/C system, which has been documented recently to be significantly advantageous over the benchmark PtNi-based catalysts for oxygen reduction. To achieve this, two hydrophobic ILs ([BMIM][NTF2] and [MTBD][BETI]) were used to modify PtNiMo/C with four IL-loading amounts between 7 and 38 wt %. We found that the Pt mass activity (@0.9 V) could be improved by up to 50% with [BMIM][NTF2] and even 70% when [MTBD][BETI] is used. Exceeding a specific IL loading amount, however, leads to a mass transport related activity drop. Moreover, it is also disclosed that both ILs can effectively suppress the formation of nonreactive oxygenated species, while at the same time imposing little effect on the electrochemical active surface area. For a deeper understanding of the degradation mechanism of pristine and IL modified PtNiMo/C, we applied identical location transmission electron microscopy and in situ scanning flow cell coupled to inductively coupled plasma mass spectrometry techniques. It is disclosed that the presence of ILs has selectively accelerated the dissolution of Mo and eventually results in a more severe degradation of PtNiMo/C. This shows that future research needs to identify ILs that prevent the Mo dissolution to leverage the potential of the IL modification of PtNiMo catalysts.

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Section: Resultsmentioning

confidence: 99%

Effect of Ionic Liquid Modification on the ORR Performance and Degradation Mechanism of Trimetallic PtNiMo/C Catalysts

et al. 2019

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“…[48] For H 2 SO 4 media, ap ossible explanationf or hindered nickel leaching could be the formation of ap assivation layer on the Ni surface in the form of NiO or NiOOH, as reported by authors who have studied the anodic passivation of bulk Ni in H 2 SO 4 media. [49][50][51][52] Similarly,n ickel contained in the Ni/Co porous shell of P5type particles and the Ni/Co/O core of some P5-typep articles does not dissolve or has very slow leachingk inetics, which contributest ot he selective leaching of REE relative to that of Ni. Indeed, in both acids, REE-containing particles( type P5), the core of which is mainly composed of lanthanum nickelates La 2 NiO 4 ,e xhibit selectivel eachingb ehavior,a se videnced by EPMA profiles such as that presented in Figure 7.…”

Section: Discussionmentioning

confidence: 99%

Leaching Mechanisms of Industrial Powders of Spent Nickel Metal Hydride Batteries in a Pilot‐Scale Reactor

et al. 2019

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In view of a sustainable recycling process, the leaching mechanisms of nickel and rare‐earth elements (REEs) contained within industrial samples of spent nickel metal hydride battery powders were investigated in HCl and H2SO4, under mild temperature (25–60 °C) and pH (3–5.5). First, in‐depth characterization of the heterogeneous battery powder was carried out with powder XRD, SEM, electron probe microanalyzer wavelength‐dispersive spectroscopy (EPMA‐WDS) quantitative analyses of individual particles, and inductively coupled plasma optical emission spectrometry (ICP‐OES) elemental analysis. An unusual result is the identification of particles that exhibit a core–shell structure, which is related to anode active mass aging mechanisms. Then, a leaching study in a 10 L pilot‐scale reactor demonstrated the selective dissolution of REEs, with respect to nickel, at pH 3, which is attributed to 1) the kinetic inhibition of nickel metal dissolution, and 2) the specific core–shell structure of aged mischmetal particles. Furthermore, the use of H2SO4 led to coprecipitation of lanthanide–alkali double sulfates and nickel salts.

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“…7a shows the results. Positive shift of anodic peak with an increase in the scan rate shows the irreversible electrode process [34]. Also, the potential shift is due to IR drop generated at higher current density values [30].…”

Section: The Effect Of Potential Scan Rate On the Methanol Oxidationmentioning

confidence: 94%

Electrochemical activity of Ni-montmorillonite/Vulcan XC-72R carbon black nano-catalyst for the oxidation of methanol in acidic medium

et al. 2019

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Direct methanol fuel cell is claiming to be the most main power source in future as a clean energy source, for which methanol is used as fuel. In the present study, nickel nanoparticles were synthesized by green route in the presence of montmorillonite (Ni-MMT). Then the electrochemical activity of prepared nanocomposite was investigated in methanol oxidation reaction in acidic medium. In the process of nickel nanoparticle synthesis, the natural substrate montmorillonite was used as capping agent and Allium jesdianum water extract was used as the source of reducing agent for the first time. The Ni-MMT sample was characterized by UV-Vis, XRD, SEM and EDX techniques. Production of nickel nanoparticles in the proposed green method is confirmed by absorption peak of 405 nm in UV-Vis spectrum. The average particle size of Ni-MMT was determined as 20.80 nm. The oxidation of methanol in acidic medium was studied by cyclic voltammetry using Ni-MMTmodified carbon paste electrode (Ni-MMT/CPE). Methanol was oxidized on the modified electrode surface at 0.3 V. Also, the catalytic current of methanol oxidation was 3 mA in H 2 SO 4 electrolyte which is significantly more than unmodified CPE. The concentration of 0.5 M for H 2 SO 4 was obtained as the optimum electrolyte for the oxidation of methanol. Methanol can be catalyzed in the concentration range of 0.1-0.5 M by the prepared nanostructured catalyst. Graphic abstractNi nanoparticles in montmorillonite (Ni-MMT) which was prepared by Allium jesdianum extract have a good electrocatalytic effect on methanol oxidation.

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Electrochemistry of the Nickel Electrode as a Cathode Catalyst in the Media of Acidic Peroxide for Application of the Peroxide Fuel Cell

Cited by 16 publications

References 16 publications

Effect of Ionic Liquid Modification on the ORR Performance and Degradation Mechanism of Trimetallic PtNiMo/C Catalysts

Effect of Ionic Liquid Modification on the ORR Performance and Degradation Mechanism of Trimetallic PtNiMo/C Catalysts

Leaching Mechanisms of Industrial Powders of Spent Nickel Metal Hydride Batteries in a Pilot‐Scale Reactor

Electrochemical activity of Ni-montmorillonite/Vulcan XC-72R carbon black nano-catalyst for the oxidation of methanol in acidic medium

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