Characterization of Pt catalysts on Nb-doped and Sb-doped SnO2– support materials with aggregated structure by rotating disk electrode and fuel cell measurements

Kakinuma, Katsuyoshi; Chino, Yuji; Senoo, Yuichi; Uchida, Makoto; Kamino, Takeo; Uchida, Hiroyuki; Deki, Shigehito; Watanabe, Masahiro

doi:10.1016/j.electacta.2013.06.127

Cited by 96 publications

(175 citation statements)

References 35 publications

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“…By TEM observation, we have clearly demonstrated that the major reason for such a high durability of Pt/TiC-600 °C was suppression of the detachment of Pt particles from the support, unlike c-Pt/CB. Hence, based on our systematic work using various ceramic supports (TiN [26], doped SnO2 [27][28][29][30], and TiC in the present work), the essential factors for the highly active and highly durable cathode catalysts are the use of a chemically and electro chemically stable support with high electrical conductivity, uniform dispersion of Pt nanocrystals on the support, and the removal of an oxide layer, if any, on the Pt surface and/or Pt-ceramic support interface.…”

Section: Discussionmentioning

confidence: 99%

“…The support materials used are typically in the form of nanoparticles with HSA to disperse Pt catalyst particles uniformly, but the use of HSA supports often leads to a high contact resistance between the particles. Recently, Kakinuma et al have developed Sb-, Nb-and Ta-doped SnO2−δ nanoparticle supports with a fused aggregated structure having both HSA and low contact resistance [27][28][29][30]. They reported that Pt-dispersed Nb-SnO2−δ and Ta-SnO2−δ exhibited both higher ORR activity and higher durability at high potentials than those for commercial Pt/CB (c-Pt/CB) catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

et al. 2015

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Abstract:We have prepared Pt nanoparticles supported on titanium carbide (TiC) (Pt/TiC) as an alternative cathode catalyst with high durability at high potentials for polymer electrolyte fuel cells. The Pt/TiC catalysts with and without heat treatment were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Hemispherical Pt nanocrystals were found to be dispersed uniformly on the TiC support after heat treatment at 600 °C in 1% H2/N2 (Pt/TiC-600 °C). The electrochemical properties (cyclic voltammetry, electrochemically active area (ECA), and oxygen reduction reaction (ORR) activity) of Pt/TiC-600 °C and a commercial Pt/carbon black (c-Pt/CB) were evaluated by the rotating disk electrode (RDE) technique in 0.1 M HClO4 solution at 25 °C. It was found that the kinetically controlled mass activity for the ORR on Pt/TiC-600 °C at 0.85 V (507 A g ). Moreover, the durability of Pt/TiC-600 °C examined by a standard potential step protocol (E = 0.9 V↔1.3 V vs. RHE, holding 30 s at each E) was much higher than that for c-Pt/CB. OPEN ACCESSCatalysts 2015, 5 967

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

et al. 2015

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“…Pt nanoparticles were loaded on the Ta-SnO 2 by use of a colloidal method. 31,32 The Pt/Ta-SnO 2 was heat-treated at 400…”

Section: Methodsmentioning

confidence: 99%

“…28,29 We have synthesized cation-doped metal oxides with a fused aggregate network structure by the flame combustion method and found that the supported Pt catalysts showed higher ORR activity and durability than that of Pt/CB. 30,31 Therefore, CLs prepared by the ES method with cation-doped metal oxides have the potential for high cell performance. However, to our knowledge, no investigations of such cell performance have been reported thus far.…”

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Improvement of Cell Performance in Low-Pt-Loading PEFC Cathode Catalyst Layers with Pt/Ta-SnO₂Prepared by the Electrospray Method

Takahashi

Koda

Kakinuma

et al. 2017

J. Electrochem. Soc.

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To reduce the Pt loadings in cathode catalysts for polymer electrolyte fuel cells, we focused on the catalyst material and catalyst-layer (CL) fabrication method, and prepared low Pt loading CLs with Pt/Ta-SnO 2 by the electrospray (ES) method. Two CLs were prepared by the ES method with different mass ratios of ionomer binder to support material (I/S), I/S = 0.7 and 0.2, and are compared to that prepared by the pulse-swirl-spray (PSS) method. Both ES CLs have higher porosity than that for the PSS CL, and have improved ionomer coverage and increased electrochemically active surface area (ECA) and mass activity at 0.85 V. In particular, that for the ES with I/S = 0.2 has high porosity and remarkably increased cell performance. The improvement obtained by use of the ES method can be explained on the basis that the coverage and uniformity of ionomer are increased due to the small droplet size. The performance of the ES cells is high, particularly under high backpressure conditions, because of the improved transport of both O 2 and protons. ES is an attractive method for the reduction of the Pt loading while improving cell performance. Polymer electrolyte fuel cells (PEFCs) have the potential to reduce the emission of greenhouse gases and air pollutants in comparison to the use of fossil fuels. [1][2][3][4][5][6] There has been a strong effort to reduce the cost of PEFC components, with attempts being made to decrease catalyst loadings while maintaining similar or improved cell performance. In order to address these challenges, several different approaches have been proposed, including the synthesis of Pt alloy catalysts and the optimization of Pt particle size or Pt interparticle distance.7-9 Our group evaluated the practical utilization of Pt under operating conditions, finding that the effectiveness of Pt was only on the order of 7.5% in air at 65• C and 0.1 MPa. 10 In order to increase the effectiveness of Pt, we examined its relationship with catalyst layer (CL) thickness and use of a Pt alloy catalyst. 11,12 In particular, the mass activity of a CL was increased by reducing the Pt loading to about 0.05 mg cm −2 . However, we also found that a new preparation method, which can construct a highly uniform layer, is necessary to improve performance of thin CLs with micrometer-order thickness. CLs are usually fabricated from a catalyst ink, which includes the Pt catalyst, an ionomer binder and a dispersing solvent. Researchers have reported the use of inkjets, 13 electrospinning 14 and electrospray (ES) 15,16 to fabricate CLs with low Pt loadings. In case of the ES method, micrometer-sized droplets of the catalyst ink can be synthesized. The ES method essentially makes use of a nozzle, which is connected to an ink reservoir, and the substrate to be coated (Fig. 1). When the ink is ejected by the influence of a strong electric field, the resulting spray can take on several different forms, according to the ink meniscus formation at the tip of the nozzle. One of these modes is the cone-jet, 17,18 involving a Taylor c...

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Factors Intervening in Oxide and Oxide‐Composite Supports on Nanocatalysts in the Energy Conversion

Estudillo‐Wong¹,

Alonso‐Vante²

2022

Heterogeneous Nanocatalysis for Energy and Environmental Sustainability

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Characterization of Pt catalysts on Nb-doped and Sb-doped SnO2– support materials with aggregated structure by rotating disk electrode and fuel cell measurements

Cited by 96 publications

References 35 publications

Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

Improvement of Cell Performance in Low-Pt-Loading PEFC Cathode Catalyst Layers with Pt/Ta-SnO₂Prepared by the Electrospray Method

Factors Intervening in Oxide and Oxide‐Composite Supports on Nanocatalysts in the Energy Conversion

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Characterization of Pt catalysts on Nb-doped and Sb-doped SnO2– support materials with aggregated structure by rotating disk electrode and fuel cell measurements

Cited by 96 publications

References 35 publications

Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

Oxygen Reduction Reaction Activity and Durability of Pt Catalysts Supported on Titanium Carbide

Improvement of Cell Performance in Low-Pt-Loading PEFC Cathode Catalyst Layers with Pt/Ta-SnO2Prepared by the Electrospray Method

Factors Intervening in Oxide and Oxide‐Composite Supports on Nanocatalysts in the Energy Conversion

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Improvement of Cell Performance in Low-Pt-Loading PEFC Cathode Catalyst Layers with Pt/Ta-SnO₂Prepared by the Electrospray Method