Partially Oxidized Tantalum Carbonitrides as a New Nonplatinum Cathode for PEFC–1–

Ishihara, Akimitsu; Shibata, Yohei; Mitsushima, Shigenori; Ota, Ken‐ichiro

doi:10.1149/1.2839606

Cited by 86 publications

(80 citation statements)

References 51 publications

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“…In particular, we found that the partially oxidized TaC 0.58 N 0.42 powder had a definite catalytic activity for the ORR and the mixture with the carbon black as a current collector was useful to increase the ORR current [16]. However, the characterization of the specimens and the discussion of the correlation between the physical properties and the catalytic activity for the ORR had not sufficiently performed yet.…”

Section: Introductionmentioning

confidence: 93%

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

Ishihara

Tamura

Matsuzawa

et al. 2010

Electrochimica Acta

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Section: Introductionmentioning

confidence: 93%

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

Ishihara

Tamura

Matsuzawa

et al. 2010

Electrochimica Acta

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“…Although the high ORR catalytic activity of tantalum oxynitrides and related compounds has already been reported by other research groups [16][17][18][19][20], significantly high activity of TaO x containing no nitrogen or carbon for the reaction has not yet been reported. The E ORR of the Ta 2 O 5 powder prepared at 1000ºC by Ota's research group was about 0.5 V vs. RHE.…”

Section: Orr Activity Of Tao X Powder Prepared From the Dip-coating Smentioning

confidence: 92%

“…Various approaches have been taken to overcome these problems, with a particular focus on searching for suitable non-platinum elements, including oxides [6][7][8][9], carbides [10], nitrides, silicides, metal complexes [11,12], and other compounds [13][14][15]. Recently, some interesting studies were reported on the development of Pt-free oxide cathodes, such as Ta-O-N, Ta-C-N-O, and Nb-C-N-O [16][17][18][19][20][21]. In previous investigations [8,9], we reported the ORR activity of dip-coated IrO 2 /Ti catalyst electrodes.…”

Section: Introductionmentioning

confidence: 99%

Oxygen reduction characteristics of several valve metal oxide electrodes in HClO4 solution

Takasu

Suzuki

Yang

et al. 2010

Electrochimica Acta

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In the search for active cathode catalysts for polymer electrolyte fuel cells (PEFCs) using inexpensive materials, several valve metal oxide electrodes, TiO x , ZrO x , TaO x , with corresponding binary oxide electrodes were selected for the evaluation of catalytic activity for oxygen reduction reaction (ORR) by means of cyclic voltammetry in 0.1 M HClO 4 at 60°C. These oxide electrodes were prepared mainly by the dip-coating method on a titanium plate substrate at a temperature between 400°C and 500°C and were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). Among the oxide-coated electrodes investigated, Ti 0.7 Zr 0.3 O x /Ti provided the highest ORR specific activity, with an onset potential, E ORR , of 0.86 V vs. RHE during the cathodic potential sweep.Fine TaO x particles prepared as an extension of the dip-coating method, showed very high catalytic activity determined by means of hydrodynamic voltammetry in 0.1 M HClO 4 at 30°C with an E ORR of 0.90 V vs. RHE.２

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“…Nevertheless, the electrocatalytic activity for the oxygen reduction reaction (ORR) on Pt-based electrocatalysts is insufficient to obtain the required efficiency. It is mostly because of the considerable over-potential losses (0.3-0.4 V) of this reaction in the cell operating conditions [13]. Furthermore, natural resources of Pt are scarce and highly expensive.…”

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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Partially Oxidized Tantalum Carbonitrides as a New Nonplatinum Cathode for PEFC–1–

Cited by 86 publications

References 51 publications

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

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

Oxygen reduction characteristics of several valve metal oxide electrodes in HClO4 solution

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

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