Kinetics and mechanism of electrochemical oxygen reduction using Platinum/clay/Nafion catalyst layer for polymer electrolyte membrane fuel cells

Narayanamoorthy, B.; Datta, K. K. R.; Balaji, S.

doi:10.1016/j.jcis.2012.08.002

Cited by 38 publications

(21 citation statements)

References 31 publications

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“…6b) were constructed and the obtained Tafel slope values were found to be 132, 137 and 135 mV/dec for PtCo, Pt-Ni and Pt-Fe bimetallic alloy nanoclusters, respectively. These obtained slope values are seen to be close to 120 mV/dec and it reveals that the surfaces of the Pt-M catalysts are quite similar to the clean Pt surface [45]. The mass activity (MA) and specific activity (SA) of the Pt-M bimetallic alloy nanoclusters can be calculated from the kinetic current density at 0.9 V vs. RHE.…”

Section: Resultsmentioning

confidence: 52%

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Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

et al. 2016

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Pt 3 M (M: Co, Ni and Fe) bimetallic alloy nanoclusters were synthesized by a novel and simple chemical reduction approach, and employed as the promising electrocatalyst to accelerate the kinetics of oxygen reduction reaction (ORR) for polymer electrolyte membrane fuel cells. From XRD, the positive shift of diffraction angle confirms the alloy formation between Pt and M and the elemental composition was confirmed by energy dispersive X-ray spectroscopy analysis. The nanocluster morphology and particle size was determined using scanning and transmission electron microscopy analysis. The ORR kinetic parameters for Pt-M electrocatalysts were calculated and compared with reported Pt/C catalysts. Among the Pt-M electrocatalysts, Pt-Co was found to be the most efficient catalyst having the higher mass and specific activity (at 0.9 V vs. RHE) of 0.44 mA/μg and 0.69 mA/cm 2 , respectively. The accelerated durability test reveals that the Pt-M bimetallic alloy nanoclusters retain appreciable surface area and mass activity after 8000 potential cycles confirms good long-term durability, and also competing with the reported benchmark ORR catalysts.

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Section: Resultsmentioning

confidence: 52%

“…From the obtained K-L slope values, the n values were calculated and found to be 3.7, 3.4 and 3.2 for Pt-Co, PtNi and Pt-Fe, respectively, and it clearly reveals that all the catalysts follow the direct 4-electron transfer mechanism during ORR [18,45].…”

Section: Resultsmentioning

confidence: 92%

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

et al. 2016

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“…Moreover, when the potential scan rate was increased, the peak potential obtained for the electrocatalytsis of methanol shifted to a more positive potential, which suggested a kinetic limitation in the reaction between the redox sites of Pt-CMMs and methanol. Therefore, oxygen reduction was diffusion-controlled at potentials below 0.4 V and was under mixed diffusion-kinetic control in the potential region between 0.4 and 0.6 V as reported elsewhere38. Conversely, the oxidation of methanol might also proceed through a mechanism other than the Langmuir-Hinshelwood mechanism, and in a previous study, Chen23 proposed the Eley–Rideal mechanism for explaining the roles of the OH groups on the surface of the Ni support and of the OH − ions in the electrolyte, respectively, in the enhancement of the CO tolerance.…”

Section: Discussionmentioning

confidence: 55%

Platinum particles supported on mesoporous carbons: fabrication and electrocatalytic performance in methanol-tolerant oxygen-reduction reactions

Dong

Chen

et al. 2014

Sci Rep

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In this report, we describe the preparation and electrochemical characterization of a Pt electrocatalyst, which was synthesized from hexachloroplatinic acid, using the incipient wetness impregnation method. This carbon mesoporous materials (Pt-CMMs) electrocatalyst was used for catalyzing the oxidation of methanol and its oxygen-reduction reaction. The electrocatalytic oxidation of methanol was studied using linear-sweep voltammograms (LSV), polarization and chronoamperometric measurements. Phase characterizations and morphological analyses were performed using 3D excitation-emission fluorescent matrix (EEFM) spectroscopy, UV-Vis absorption measurements, and X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM) techniques; the ESEM system was equipped with an energy-dispersive spectrometer (EDS). The oxidation capacity measured using a LSV might explain the high activity exhibited by the Pt-CMM electrocatalysts in methanol-tolerant oxygen reduction, and the results demonstrated that the potential and current density of the main reaction peak of the Pt-CMMs electrocatalyst changed during the reaction. Moreover, EEFM spectroscopy and XRD were determined to be appropriate and effective methods for characterizing Pt clusters that enhance their intrinsic emission from Pt-CMMs electrocatalysts in electrocatalytic-treatment systems. Furthermore, the ESEM-EDS results showed that fresh Pt nanoparticles were highly dispersed on CMMs and featured a 20 nm diameter and a narrow particle-size distribution.

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“…Like naturally occurring clay minerals, synthetic clay also employed as catalyst support for cathodic oxygen reduction in PEM fuel cells. Amino propyl functionalized Mg-phyllosilicate clay employed as catalyst support for ORR in PEMFC [49,50]. The amino groups of synthetic clay hold metal nanoparticles by physical interaction and increase the stability of the catalyst than conventional carbon supports.…”

Section: Carbon-free Catalyst Supportsmentioning

confidence: 99%

“…In polymer nanocomposites, inorganic additives such as quaternary ammonium salts, SiO 2 ,TiO 2 , WO 2 , etc. [40,41,52,53] and layered silicate minerals such as clay minerals [50] are used as fillers and used as catalyst supports for energy applications. Aminoclay/Nafion nanocomposite membranes were prepared through sol-gel approach with embedded Pt nanoparticles by simple chemical reduction method.…”

Section: Polymer Nanocompositesmentioning

confidence: 99%

Advanced Supporting Materials for Polymer Electrolyte Membrane Fuel Cells

Bhuvanendran¹

2018

Proton Exchange Membrane Fuel Cell

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Among the various kinds of fuel cell, polymer electrolyte membrane fuel cell (PEMFC) is the most prominent energy conversion device for portable applications. The catalystsupporting materials provi.de active triple phase boundary for electrochemical reactions where the reactant molecules can easily interact with the catalyst surface. Catalysts play a vital role for improving the overall efficiency of the fuel cells through the advancement in the catalyst and their supporting materials for cathodic oxygen reduction reaction (ORR) in PEMFCs. The supporting materials mainly contribute to increase the electrocatalytic activity of the catalysts by providing more active surface area and extended life-time. The major roles of supporting materials are (i) they act as electron source with improved conductivity; (ii) they hold the metal nanoparticles; (iii) they possess higher surface area and (iv) they should have better stability under operating conditions. In this chapter, the various supporting materials were reviewed carefully based on their nature and performance toward the electrochemical reduction of oxygen for PEMFCs. They are classified into three major categories as (i) carbon supports; (ii) carbon-free supports, and (iii) polymer nanocomposites. In summary, the overall view on support materials and their role on electrocatalysis for fuel cell reactions is provided.

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Kinetics and mechanism of electrochemical oxygen reduction using Platinum/clay/Nafion catalyst layer for polymer electrolyte membrane fuel cells

Cited by 38 publications

References 31 publications

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

Pt3M (M: Co, Ni and Fe) Bimetallic Alloy Nanoclusters as Support-Free Electrocatalysts with Improved Activity and Durability for Dioxygen Reduction in PEM Fuel Cells

Platinum particles supported on mesoporous carbons: fabrication and electrocatalytic performance in methanol-tolerant oxygen-reduction reactions

Advanced Supporting Materials for Polymer Electrolyte Membrane Fuel Cells

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