Tantalum oxide-based compounds as new non-noble cathodes for polymer electrolyte fuel cell

Ishihara, Akimitsu; Tamura, Motoko; Matsuzawa, Koichi; Mitsushima, Shigenori; Ota, Ken Ichiro

doi:10.1016/j.electacta.2009.10.063

Cited by 94 publications

(83 citation statements)

References 34 publications

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“…17 Nevertheless, the refinement and advanced implementation of the TF-RDE technique reported by the groups discussed so far 6,[13][14][15][16] has had a profound influence in the field of electrocatalyst characterization leading to its widespread adoption. TF-RDE has been use to determine the ORR activity of Pt-alloy catalysts, [18][19][20][21][22][23][24][25][26] core-shell catalysts, [27][28][29][30][31][32] extended thin film structures, [19][20][21]33,34 non-precious metal catalysts, [35][36][37][38][39][40][41] Pt on alternative supports, 42,43 as well as particle size effects, 14,17,[44][45][46][47][48][49][50] oxygen reaction order, 15,51 activation energy, durability, 27,…”

mentioning

confidence: 99%

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Shinozaki

Zack

Pylypenko

et al. 2015

J. Electrochem. Soc.

245

191

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Platinum electrocatalysts supported on high surface area and Vulcan carbon blacks (Pt/HSC, Pt/V) were characterized in rotating disk electrode (RDE) setups for electrochemical area (ECA) and oxygen reduction reaction (ORR) area specific activity (SA) and mass specific activity (MA) at 0.9 V. Films fabricated using several ink formulations and film-drying techniques were characterized for a statistically significant number of independent samples. The highest quality Pt/HSC films exhibited MA 870 ± 91 mA/mg Pt and SA 864 ± 56 μA/cm 2 Pt while Pt/V had MA 706 ± 42 mA/mg Pt and SA 1120 ± 70 μA/cm 2 Pt when measured in 0.1 M HClO 4 , 20 mV/s, 100 kPa O 2 and 23 ± 2 • C. An enhancement factor of 2.8 in the measured SA was observable on eliminating Nafion ionomer and employing extremely thin, uniform films (∼4.5 μg/cm 2 Pt ) of Pt/HSC. The ECA for Pt/HSC (99 ± 7 m 2 /g Pt ) and Pt/V (65 ± 5 m 2 /g Pt ) were statistically invariant and insensitive to film uniformity/thickness/fabrication technique; accordingly, enhancements in MA are wholly attributable to increases in SA. Impedance measurements coupled with scanning electron microscopy were used to de-convolute the losses within the catalyst layer and ascribed to the catalyst layer resistance, oxygen diffusion, and sulfonate anion adsorption/blocking. The ramifications of these results for proton exchange membrane fuel cells have also been examined.

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mentioning

confidence: 99%

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Shinozaki

Zack

Pylypenko

et al. 2015

J. Electrochem. Soc.

245

191

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“…Therefore, the surface areas of the oxide-based catalysts prepared by heat treatment under low oxygen partial pressures remained as low as several m 2 g À1 [16]. However, the carbon and nitrogen components of the carbonitride precursors are considered to be effective for creating the oxygen-vacancy active sites [19].…”

Section: Introductionmentioning

confidence: 98%

“…We have previously described the acid stability and catalytic ORR activity for a number of materials, including tantalum-doped tungsten carbide [5], tantalum oxynitride [6][7][8], zirconium oxide [9][10][11], titanium oxide [12], zirconium oxynitride [13,14], tantalum carbonitride [15], and tantalum-oxide-or zirconium-oxide-based catalysts [16][17][18]. In addition, we revealed that the tantalum oxide-based catalysts prepared from tantalum carbonitride by heat treatment under low oxygen partial pressure showed definite ORR activity, and identified the active sites as oxygen vacancies on the oxide [19].…”

Section: Introductionmentioning

confidence: 99%

Tantalum oxide-based electrocatalysts made from oxy-tantalum phthalocyanines as non-platinum cathodes for polymer electrolyte fuel cells

Uehara

Ishihara

Matsumoto

et al. 2015

Electrochimica Acta

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“…In order to narrow this wide band gap of the oxides and make surface defects, it has been shown that inserting N and/or C into the oxide structure is the most effective method. In addition, transition metal nitrides and/or carbides have higher electrical conductivity than their oxides [41].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and physicochemical properties of titanium Oxy-nitride electrocatalyst prepared by sol-gel methods for the oxygen reduction reaction purposes

Seifitokaldani

Oishi

Perrier

et al. 2015

J Solid State Electrochem

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In the present article, titanium oxy-nitride (TiON), as a potential electrocatalyst for the oxygen reduction reaction (ORR), is fabricated by four different sol-gel methods. Physicochemical properties (structure, chemical composition, BET surface area, surface morphology, chemical stability, and electrochemical stability) are determined. The ORR in acid medium on these TiON electrocatalysts is evaluated and compared to the ORR on commercial Pt/C. This evaluation is based on the onset potential, charge density, Tafel slope, exchange current density, and mass activity. Chemical and electrochemical stability of TiON electrocatalysts are compared to those of platinum electrocatalyst. It is shown that the preparation method affects the electrocatalytic activity and stability. The stability of the TiON electrocatalysts is correlated to their chemical composition and BET surface area. In addition, the effect of the heat treatment condition on the chemical composition, surface area, and performance of the electrocatalysts are investigated. The best TiON electrocatalyst with a high content of nitrogen exhibited the onset potential of 0.75 V vs. NHE, which is quite promising for a non-noble electrocatalyst for the ORR in acid medium.

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Tantalum oxide-based compounds as new non-noble cathodes for polymer electrolyte fuel cell

Cited by 94 publications

References 34 publications

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Oxygen Reduction Reaction Measurements on Platinum Electrocatalysts Utilizing Rotating Disk Electrode Technique

Tantalum oxide-based electrocatalysts made from oxy-tantalum phthalocyanines as non-platinum cathodes for polymer electrolyte fuel cells

Electrochemical and physicochemical properties of titanium Oxy-nitride electrocatalyst prepared by sol-gel methods for the oxygen reduction reaction purposes

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