Pt nanoparticle-supported carbon nanowalls electrode with improved durability for fuel cell applications using C2F6/H2 plasma-enhanced chemical vapor deposition

Imai, Shun; Kondo, Hiroki; Hyungjun, Cho; Ishikawa, Kenji; Tsutsumi, Takayoshi; Sekine, Makoto; Hiramatsu, Mineo; Hori, Masaru

doi:10.7567/1882-0786/aaf0ab

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…Extensive research has been dedicated to advanced carbonic materials with favorable properties: corrosion resistance, mechanical strength, high thermal and electrical conductivities, low fabrication costs, and environmental friendliness [6][7][8][9]. A wide range of materials such as carbon aerogels, xerogels, carbon nanotubes, and graphene have thus been explored [6,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Carbon-Nanowall Microporous Layers for Proton Exchange Membrane Fuel Cell

et al. 2022

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The cathode microporous layer (MPL), as one of the key components of the proton exchange membrane fuel cell (PEM-FC), requires specialized carbon materials to ensure the two-phase flow and interfacial effects. In this respect, we designed a novel MPL based on highly hydrophobic carbon nanowalls (CNW). Employing plasma-assisted chemical vapor deposition techniques directly on carbon paper, we produced high-quality microporous layers at a competitive yield-to-cost ratio with distinctive MPL properties: high porosity, good stability, considerable durability, high hydrophobicity, and substantial conductivity. The specific morphological and structural properties were determined by scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Thermo-gravimetric analysis was employed to study the nanostructures’ thermal stability and contact angle measurements were performed on the CNW substrate to study the hydrophobic character. Platinum ink, serving as a fuel cell catalyst, was sprayed directly onto the MPLs and incorporated in the FC assembly by hot-pressing against a polymeric membrane to form the membrane-electrode assembly and gas diffusion layers. Single-fuel-cell testing, at moderate temperature and humidity, revealed improved power performance comparable to industrial quality membrane assemblies (500 mW cm−2 mg−1 of cathodic Pt load at 80 °C and 80% RH), with elevated working potential (0.99 V) and impeccable fuel crossover for a low-cost system.

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Section: Introductionmentioning

confidence: 99%

Carbon-Nanowall Microporous Layers for Proton Exchange Membrane Fuel Cell

et al. 2022

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“…However, the effect of amount and morphology of metal coating on emission has not fully been examined. On the other hand, metal-coated CNWs have been intended to be used as electrodes for fuel cells [22][23][24][25] and supercapacitors [26] and substrates for surface enhanced Raman scattering [27], not as emission sources.…”

Section: Introductionmentioning

confidence: 99%

Field emission characteristics of metal nanoparticle-coated carbon nanowalls

2020

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Metal nanoparticles are deposited on nitrogen-incorporated carbon nanowalls (CNWs) using Ag, Au, In, and Mg as metal species for enhancing field emission. Morphology, coverage, chemical composition, and crystallinity of the metal coatings on CNW surfaces are examined by varying nominal thickness of metals within 10 nm. The emission characteristics reveal that coating CNWs with any metal species lowers emission turn-on fields and thus increases emission efficiency. The inverse dependence of field enhancement factor and turn-on field upon nominal thickness of metals confirms that additional field amplification at metal nanoparticles governs emission efficiency regardless of work functions of the metals. The Ag-coated CNWs retain the highest current density for long-time emission at a constant applied field, while the non-coated CNWs have higher emission stability and a larger time constant of current degradation than the metal-coated ones.

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“…14) While metal coating has actually been used to improve durability and stability for various emitter materials such as Si, ZnO, and diamond, [15][16][17] less attention has been paid to the morphological effect of metals. For CNWs, metal coating has not been applied for emission sources but for electrodes for fuel cells 18,19) and supercapacitors. 20) The present authors show the variation of emission characteristics of metal nanoparticle-coated CNWs along with the amount of metal coating and confirms the dominant role of local field enhancement in increasing emission performance.…”

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confidence: 99%

Enhanced field emission from metal-coated carbon nanowalls

Kaneko¹,

Terada²,

Teii³

2019

Jpn. J. Appl. Phys.

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Fine-grained metals with sizes as small as 10 nm are deposited on nitrogen-incorporated carbon nanowalls to enhance field emission. The amount of metal coating is varied using the nominal thickness to control morphology and coverage of metal nanoparticles. The emission turn-on field decreases down to around 1.6 V um -1 and 1.8 V um -1 with increasing thickness of Ag and Au to 2 nm and 4 nm, respectively, and increases for further increase in thickness. A lower turn-on field corresponds well to a larger field enhancement factor, confirming that additional field enhancement with the morphological evolution of metal nanoparticles governs emission performance.

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Pt nanoparticle-supported carbon nanowalls electrode with improved durability for fuel cell applications using C₂F₆/H₂ plasma-enhanced chemical vapor deposition

Cited by 7 publications

References 31 publications

Carbon-Nanowall Microporous Layers for Proton Exchange Membrane Fuel Cell

Carbon-Nanowall Microporous Layers for Proton Exchange Membrane Fuel Cell

Field emission characteristics of metal nanoparticle-coated carbon nanowalls

Enhanced field emission from metal-coated carbon nanowalls

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