Electrochemically Fabricated Tin–Palladium Bimetallic Electrocatalyst for Oxygen Reduction Reaction in Acidic Media

Miah, Md. Rezwan; Alam, Muhammad Tanzirul; Okajima, Takaharu; Ohsaka, Takeo

doi:10.1149/1.3183803

Cited by 13 publications

(4 citation statements)

References 70 publications

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“…For Pd-NC3-GCE, the current densities were 70 and 61 mA/cm 2 in the formic acid electrolyte for the positive and negative scans, respectively. This observed difference may be induced by adsorption of intermediate products that was produced during the oxidation of formic acid. ,− Furthermore, the onset potential of Pd-NC3-GCE tended to be more negative than those of other modified GCEs (Figures A and A), indicating the best electrocatalytic oxidation activity of Pd-NC3. The ratio of the forward to backward current intensities of Pd-NC3 is also higher than that of Pd-NC4, which indicated the CO tolerance of Pd-NC3 was better than that of Pd-NC4. − Chronoamperometric data (Figure B) showed that the current density decreased quickly with time and reached a plateau after ∼100 s for all the Pd-GCEs, in which the order for the electrooxidation of formic acid can be observed to be the same as that derived from Figure A.…”

Section: Resultsmentioning

confidence: 96%

“…It was suggested that Pd NCs should undergo a dissolution–deposition–aggregation process during electrocatalysis, as illustrated at the bottom right of Figure . The formation of large Pd nanoparticles may be ascribed to the Ostwald ripening effect because large particles have low surface energy and reaction activity . Consequently, Pd-NC3B showed electrochemical activity lower than that of Pd-NC3.…”

Section: Resultsmentioning

confidence: 99%

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Formic Acid-Assisted Synthesis of Palladium Nanocrystals and Their Electrocatalytic Properties

Wang

Guo

et al. 2014

Langmuir

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Palladium (Pd) nanocrystals have been synthesized by using formic acid as the reducing agent at room temperature. When the concentration of formic acid was increased continuously, the size of Pd nanocrystals first decreased to a minimum and then increased slightly again. The products have been investigated by a series of techniques, including X-ray diffraction, high-resolution transmission electron microscopy (HRTEM), UV-vis absorption, and electrochemical measurements. The formation of Pd nanocrystals is proposed to be closely related to the dynamical imbalance of the growth and dissolution rate of Pd nanocrystals associated with the adsorption of formate ions onto the surface of the intermediates. It is found that small Pd nanocrystals showed blue-shifted adsorption peaks compared with large ones. Pd nanocrystals with the smallest size display the highest electrocatalytic activity for the electrooxidation of formic acid and ethanol on the basis of cyclic voltammetry and chronoamperometric data. It is suggested that both the electrochemical active surface area and the small size effect are the key roles in determining the electrocatalytic performances of Pd nanocrystals. A "dissolution-deposition-aggregation" process is proposed to explain the variation of the electrocatalytic activity during the electrocatalysis according to the HRTEM characterization.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Formic Acid-Assisted Synthesis of Palladium Nanocrystals and Their Electrocatalytic Properties

Wang

Guo

et al. 2014

Langmuir

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“…Bare Au electrodes are known to catalyze ORR − in pH 7 buffer solutions. However, when immersed in aqueous ATM solutions for more than 20 min, they do not exhibit ORR (Supporting Information, Figure S4).…”

Section: Results and Discussionmentioning

confidence: 99%

Ammonium Tetrathiomolybdate: A Versatile Catalyst for Hydrogen Evolution Reaction from Water under Ambient and Hostile Conditions

et al. 2013

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The lack of catalysts that can selectively reduce protons to produce hydrogen from water in the presence of oxygen and other conventional inhibitors of hydrogen evolution reaction (HER) has been a fundamental problem stalling the development of a practical hydrogen economy. Ammonium tetrathiomolybdate (ATM), a common laboratory reagent, spontaneously assembles on Au electrodes. Atomic force microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy data indicate formation of multiple layers of ATM which are stable over a wide pH range for days. These assemblies can produce hydrogen with very low onset potentials. It shows a turnover rate of 1.4 s(-1) and turnover number >5 × 10(4) in pH 7 at 180 mV overpotential. The pH dependence of the peak potential suggests that the generation of H2 from water proceeds likely via a ligand based proton coupled electron transfer process which precludes inhibition by O2. The ATM functionalized Au electrodes are found to efficiently catalyze HER in saline rich, CO saturated, and sulfide rich water sources with minimal inhibition of catalytic activity.

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“…8,9 Different techniques such as oxide reaction, 10 heat molten, 11 and vacuum evaporation have been employed to prepare Pd-based alloys. 12 However, there is limited information on the preparation of Pd-based alloys using electrodeposition, 13 even though electrodeposition is relatively more economic. This is partly because electrodeposition of Pd-metal alloys from aqueous baths may encounter difficulties associated with the low hydrogen overvoltage and the large hydrogen solubility in Pd metals.…”

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confidence: 99%

Electrodeposition of Palladium–Tin Alloys from 1-Ethyl-3-methylimidazolium Chloride–Tetrafluoroborate Ionic Liquid for Ethanol Electro-Oxidation

Jou

Chang²,

Whang

et al. 2010

J. Electrochem. Soc.

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Electrodeposition of palladium–tin alloys from 1-ethyl-3-ethylimidazolium chloride–tetrafluoroborate ionic liquid was studied at 120°C . Sn(II) chloride reacts spontaneously with Pd(II) chloride, producing Sn(IV) and Pd nanoparticles. Solutions containing Sn(IV) and Pd(II) were used for potentiostatic electrodeposition of Pd–Sn. The composition of the Pd–Sn electrodeposits varied with the solution composition and deposition potential. Different alloy phases were observed with X-ray diffraction measurements. Whereas the Pd-rich Pd–Sn solid solution deposits are composed of compact nodules, the Sn-rich intermetallic Pd–Sn deposits are composed of polyhedral crystals of various phases. Compared to Pd-coated electrodes, Pd–Sn solid-solution-coated electrodes show enhanced ethanol electro-oxidation efficiency and stability in alkaline aqueous solutions. As Sn content increased, new Pd/Sn intermetallic phases formed, resulting in reduced catalytic efficiency for ethanol oxidation.

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Electrochemically Fabricated Tin–Palladium Bimetallic Electrocatalyst for Oxygen Reduction Reaction in Acidic Media

Cited by 13 publications

References 70 publications

Formic Acid-Assisted Synthesis of Palladium Nanocrystals and Their Electrocatalytic Properties

Formic Acid-Assisted Synthesis of Palladium Nanocrystals and Their Electrocatalytic Properties

Ammonium Tetrathiomolybdate: A Versatile Catalyst for Hydrogen Evolution Reaction from Water under Ambient and Hostile Conditions

Electrodeposition of Palladium–Tin Alloys from 1-Ethyl-3-methylimidazolium Chloride–Tetrafluoroborate Ionic Liquid for Ethanol Electro-Oxidation

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