Different nanostructure cathode catalysts application for direct methanol fuel cell

Dipti, Sharmin Sultana; Chung, U‐Chan; Kim, Jong-Pil; Chung, W.

doi:10.1002/pssa.200777236

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…45–51 There is particular interest in alloying Ni NP with Pt, 45 Ag, 46 Au 47–49 and Pt /Ru 50, 51 to reduce catalyst cost. These metals are rather immiscible with Ni so that these metals should segregate to the outer surface layer of the Ni NP.…”

Section: Cooperative Atomic Motion In the Interfacial Dynamics Of Ni mentioning

confidence: 99%

“…Alloying offers the promise of creating less expensive, chemically stable and more efficient catalysts for diverse energy related applications, and it is a matter of some importance to understand how the alloying effect can be optimized to create the greatest efficiency of catalytic behavior. [45][46][47][48][49][50][51] There is particular interest in alloying Ni NP with Pt, 45 Ag, 46 Au [47][48][49] and Pt/ Ru 50,51 to reduce catalyst cost. These metals are rather immiscible with Ni so that they should segregate to the outer surface layer of the Ni NP.…”

Section: Cooperative Atomic Motion In the Interfacial Dynamics Of Ni ...mentioning

confidence: 99%

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Glassy interfacial dynamics of Ni nanoparticles: part I Colored noise, dynamic heterogeneity and collective atomic motion

Zhang

Douglas

2013

Soft Matter

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Most condensed materials exhibit a significant fraction of atoms, molecules or particles that are strongly interacting with each other, while being configured geometrically at any instant of time in an ‘amorphous’ state having a relatively uniform density. Recently, both simulations and experiments have revealed that the dynamics of diverse condensed amorphous materials is generally characterized by significant heterogeneity in the local mobility and by progressively increasing collective motion upon cooling that takes the form of string-like collective particle rearrangements. The direct experimental observation of this type of collective motion, which has been directly linked to the growing relaxation times of glass-forming materials, and its quantification under different thermodynamic conditions, has so far been restricted to colloidal and driven granular fluids. The present work addresses the fundamental problem of how to determine the scale of this type of collective motion in materials composed of molecules or atoms. The basic premise of our work is that large scale dynamic particle clustering in amorphous materials must give rise to large fluctuations in particle mobility so that transport properties, especially those related to particle mobility, should naturally exhibit noise related to the cooperative motion scale. In our initial exploratory study seeking a relationship of this kind, we find 1/fα or ‘colored noise’, in both potential energy and particle displacements fluctuations of the atoms within the glassy interfacial layer of Ni nanoparticles (NPs). A direct relation between the particle displacement (mobility) noise exponent α and the average polymerization index of the string-like collective motion L is observed for a range of NP sizes, temperatures and for surface doping of the NPs with other metal atoms (Ag, Au, Pt) to change of fragility of the glassy interfacial layer at the surface of the Ni NPs. We also introduce a successful analytic model to understand this relationship between α and L

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Section: Cooperative Atomic Motion In the Interfacial Dynamics Of Ni mentioning

confidence: 99%

Section: Cooperative Atomic Motion In the Interfacial Dynamics Of Ni ...mentioning

confidence: 99%

Glassy interfacial dynamics of Ni nanoparticles: part I Colored noise, dynamic heterogeneity and collective atomic motion

Zhang

Douglas

2013

Soft Matter

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“…4 Hence, the electrospun Pt or Pt-based nanowires have been widely studied to explore their physical and chemical characteristics and possible applications in fuel cells. [5][6][7][8][9][10][11][12][13][14] PEMFC has several distinct advantages and is considered to be the most suitable fuel cell to be used in electrical vehicles. However, the durability and cost of the conventional Pt/C catalysts remain the major blocks hindering the fulfillment of commercialization of fuel cell vehicles.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of platinum nanowires by centrifugal electrospinning method for proton exchange membrane fuel cell

Huang

Chang

2021

Int J Energy Res

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The centrifugal electrospinning method is employed to fabricate platinum (Pt) nanowires and its application for proton exchange membrane fuel cell (PEMFC) is evaluated. The nanowires are produced from a polymer solution containing hexachloroplatinic acid hydrate as Pt precursor and polyvinyl pyrrolidone (PVP). The effects of system parameters on the morphology of Pt nanowires are studied including the PVP concentration, rotation speed of spinneret, and applied electric field. The electrochemically active surface area (ESA) of the Pt nanowires is characterized by cyclic voltammetry tests. The produced Pt nanowires are also used as electrocatalysts in the cathode of PEMFC and the cell performance is tested. Results show the centrifugal electrospinning method can successfully produce Pt nanowires with mean diameter of 54 ± 14 nm and ESA of 5.64m 2 g -1 , which are comparable to those of traditional electrospun Pt nanowires. The production rate of Pt nanowires can be improved greatly in comparison with the conventional electrospinning technique. It is also found that by the accelerated degradation tests, Pt nanowires demonstrate better durability than commercial Pt/C and the employment of Pt nanowires as electrocatalysts mixed with Pt/C can enhance the fuel cell performance. The present results reveal the centrifugal electrospinning method is an efficient approach to fabricate Pt nanowires for the application in PEMFCs. Novelty statement• A centrifugal electrospinning device was designed to fabricate Pt nanowires successfully with good morphology.• The production rate of Pt nanowires is enhanced greatly in comparison with the conventional electrospinning method.

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“…To date, a wide variety of nanostructured carbons, such as carbon nanotubes ͑CNTs͒, carbon nanocapsules ͑CNCs͒, and carbon nanofibers, have been synthesized and evaluated for DMFCs. [14][15][16][17][18] Among them, CNTs have been investigated extensively as catalyst supports for DMFCs and polymer electrolyte fuel cells for both anodes and cathodes. [19][20][21][22][23][24] It is recognized that the CNTs demonstrate superb characteristics over conventional carbon blacks in surface structure, mechanical and thermal properties, electrical conductivity, and surface area.…”

mentioning

confidence: 99%

Pulse Electrodepositions of PtRu on Large-Area Carbon Nanotubes for Enhancement of Methanol Electro-Oxidation

Hsieh

et al. 2010

J. Electrochem. Soc.

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We employed an electroless deposition technique to prepare Ni seeds uniformly on a carbon cloth, followed by carbon nanotube ͑CNT͒ formation at an elevated temperature. Subsequently, a pulse electrodeposition was used to impregnate PtRu nanoparticles on the CNT structure. Similar procedures were performed on carbon supports including Vulcan XC72R, BP2000, and carbon nanocapsules ͑CNCs͒ for comparison purposes. Diffraction patterns from an X-ray confirmed a PtRu alloyed phase. An analysis from inductively coupled plasma-mass spectrometry indicated that the PtRu composition was relatively unchanged. Images from scanning and transmission electron microscopes revealed dense CNTs throughout the carbon cloth with nanoparticulate PtRu evenly impregnated. Considerable PtRu aggregations were found on the CNCs and BP2000. We observed a significantly improved coulomb efficiency and an electrochemically active surface area for the CNT-grown carbon cloth. In both apparent current density and mass activity for methanol electro-oxidation, the CNT-grown carbon cloth revealed the largest values. We attribute the performance enhancement to the large-area CNT structure that allowed facile access of electrolytes.

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Different nanostructure cathode catalysts application for direct methanol fuel cell

Cited by 10 publications

References 8 publications

Glassy interfacial dynamics of Ni nanoparticles: part I Colored noise, dynamic heterogeneity and collective atomic motion

Glassy interfacial dynamics of Ni nanoparticles: part I Colored noise, dynamic heterogeneity and collective atomic motion

Fabrication of platinum nanowires by centrifugal electrospinning method for proton exchange membrane fuel cell

Pulse Electrodepositions of PtRu on Large-Area Carbon Nanotubes for Enhancement of Methanol Electro-Oxidation

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