Energy efficient role of Ni/NiO in PdNi nano catalyst used in alkaline DEFC

Dutta, Abhijit; Datta, Jayati

doi:10.1039/c3ta12708g

Cited by 120 publications

(86 citation statements)

References 54 publications

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“…The electrochemically active surface area (ECSA) was estimated from the charge corresponding to the Pd-oxide reduction peak in 1 M NaOH by dividing obtained charge with the charge of 420 µC cm -2 (corresponding to the monolayer of Pd-oxide), in accordance with the previous reports [6,8,22]. The presented results are corrected for the ECSA.…”

Section: Methodssupporting

confidence: 64%

“…This causes a downshift of the Pd d-band center and consequently leads to weaker bonding with adsorbates such as poisoning intermediates in the EOR. Besides, Pd has a higher ionization energy than Ni and because of that Ni atoms become positively charged, facilitating the formation of oxides on Ni [21,22]. Generated OH ad species of Ni participate in the oxidative desorption of intermediates in the EOR enhancing the activity of binary PdNi catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

Lović

Jović

2017

J. Electrochem. Sci. Eng.

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Section: Methodssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

Lović

Jović

2017

J. Electrochem. Sci. Eng.

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“…The electrochemical surface area (ECSA) of each catalyst was calculated by Eq. 3 42 with coulombic charge (Q o ) for the reduction of PdO, 33,26 which is presented in CV curves ( Figure S5a) at the potential region of -0.45 V. 42 The values of the ECSA are summarized in Table I.…”

Section: Electrochemical Investigation Of Ni-pd Nanoflowers-mentioning

confidence: 99%

“…The calculated sizes are ∼47, ∼41 and ∼18 nm for Ni-Pd nanoflowers, PdNPs and Ni/Pd composite, respectively. Also, based on the same peak, the alloying percentages for Ni-Pd nanoflowers and Ni/Pd composite were calculated from the Vegard's law 33 and are presented in the Table I. The higher alloying% was found in Ni-Pd nanoflowers and was approximately 2 times than that of Ni/Pd composite.…”

Section: Characterization Of Ni-pd Nanoflowers Ni/pd Composite Andmentioning

confidence: 99%

“…31,32 With view in mind, the tailored design and synthesis of Pd with Ni has attracted much attention because of their low cost and superior catalytic activities. 17,26,29,30,32,33 Therefore, the Ni-Pd nanoflowers as new catalysts will attract much interest because of the special conjunction effects of alloyed formation and nanoflower-like * Electrochemical Society Active Member.…”

Section: 2mentioning

confidence: 99%

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Synthesis and Electrocatalytic Activity Evaluation of Nanoflower Shaped Ni-Pd on Alcohol Oxidation Reaction

Ahmed

2014

J. Electrochem. Soc.

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We are reporting a synthesis of nickel and palladium (Ni-Pd) nanoflowers with excellent size and Calendula-like shapes using a wet-chemistry method for efficient alcohol oxidation reaction (AOR). The nanoflower structure has shown to have electrocatalytic activity to monohydric shorter carbon chain containing alcohols (C1-C4; methanol, ethanol, propanol and n-butanol). The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) reveal that the Ni-Pd nanoflowers catalyst has different electronic behavior due to flower-like structure and comparatively higher degree of alloy formation. The transmission electron microscopy (TEM) images showed a Calendula flower-like shape and crystalline structure of Ni-Pd. The electrochemical properties of the catalyst have been evaluated by cyclic voltammetry (CV) and chronoamperometry (CA) in 1 M KOH electrolyte. For the first time, a comparative kinetic analysis has been investigated between four alcohol's catalysis. The higher electrocatalytic activity has increased in the order of C3 > C4 > C1 > C2. The overall AOR kinetic study has determined that the Ni-Pd is favorable due to Ni mediated alloyed formation and flower-like structure. The 3D flower-like nanostructures have been proven to be an effective way to improve the electrocatalytic activity and tolerance to poisoning intermediates of palladium (Pd) based electrocatalysts. 1,2The flower-like nanostructure of Pd or Pd alloy have been generated a huge interest due to their advantages, such as, larger surface area, highly active centers and corner atoms. 1 Most research efforts have been limited to the fabrication and application of Pd nanoparticles (NPs) due to strong redox catalytic effect, 13 whereas, the nanoflower structures have been shown to be more active and stable than their NPs format for the electrooxidation of methanol in alkaline medium.1 Therefore, it remains a challenge to directly synthesize Pd based nanoflowers via a chemical route and to compare these with PdNPs and/or Pd composite catalysts.Meanwhile, the platinum (Pt) based catalysts act as the best electrocatalysts in FCs, [14][15][16] that have been suffering from multiple problems, such as, the slow reaction kinetics, CO poisoning, the high cost, limited reserve in nature, poor durability and high CO 2 prodiction. [17][18][19][20][21][22][23] It is, however, aiming at reducing the usage of the precious Pt metal and hence the cost of FCs, the development of non-Pt electrocatalysts has thus generated a great deal of interest.9 It has shown that the Pd is a promising electrocatalyst because of much cheaper than Pt and highly electroactive to the small organic molecules (i.e. lowmolecular weight alcohols) oxidation in alkaline media 1,3,24-26 for direct alcohol fuel cells (DAFCs) and/or proton exchange membrane fuel cells (PEMFCs), that are regarded as promising future and clean power sources. 27,28The addition of transition metal like nickel (Ni) to Pd can obviously further improve the overall electrocatalytic activities of Pd because of the b...

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Energy Efficiency of Alkaline Direct Ethanol Fuel Cells Employing Nanostructured Palladium Electrocatalysts

et al. 2015

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Carbon supported nanostructured palladium or palladium alloys are considered the best performing anode electrocatalysts currently employed in alkaline electrolyte membrane direct ethanol fuel cells (AEM‐DEFCs). High initial peak power densities are generally obtained as Pd preferentially favors the selective oxidation of ethanol forming acetate thus avoiding strongly poisoning intermediates such as CO. However, few studies exist that investigate DEFC performance in terms of both energy efficiency and discharge energy density, as well as power density depending on the concentration of fuel. In this paper we have determined such parameters for room temperature air breathing AEM‐DEFCs equipped with Pd based anodes, anion exchange membranes and FeCo/C cathode electrocatalysts. Combined with the optimization of the fuel composition a maximum energy efficiency of ≈7 % was obtained for this AEM‐DEFC. Such a performance suggests that devices of this type are suitable for supplying low power applications such as small portable electronic devices.

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Energy efficient role of Ni/NiO in PdNi nano catalyst used in alkaline DEFC

Cited by 120 publications

References 54 publications

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

Synthesis and Electrocatalytic Activity Evaluation of Nanoflower Shaped Ni-Pd on Alcohol Oxidation Reaction

Energy Efficiency of Alkaline Direct Ethanol Fuel Cells Employing Nanostructured Palladium Electrocatalysts

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