Air Electrode Properties of an Active Carbon Fiber Felt with Pd and Ni Deposits

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  • KERA Yoshiya
    Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University
  • NAKAGISHI Tetsuyuki
    Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University
  • MIYAGAWA Hiroyuki
    Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University

Bibliographic Information

Other Title
  • パラジウムおよびニッケルを担持した活性炭素繊維不織布の空気極特性

Abstract

The air electrode properties of Pd and Ni metals deposited on an active carbon fiber felt (KF-felt) were examined reffering to a zinc electrode. The maximum power, which w as evaluated from the electric power-current curve for the zinc-air cell at 40°C in air, increased linearly with the amount of Ni deposit up to 50 mg/g-felt. The maximum power for Pd deposited electrode reached a maximum value at 18 mg/g-felt of Pd; it remained constant with deposited Pd between 18 mg and 112 mg/g-felt. The discharge current was measured under the constant terminal voltage O.75 V between 20 and 50°C with the oxygen partial pressure from 0.2 to 1 atm. The current density depended on the temperature. It also varied with the oxygen partial pressure in accordance with Langmuir relation. The apparent activation energy (Ea), the 'relative values for the oxygen adsorption equilibrium constant (b) and of the product (k0.⋅a) of the apparent rate constant (k0) and the adsorbed amount for the monolayer (a) for the oxygen activation process on Pd (18 mg) and Ni (50 mg)/KFfelt were estimated as follows: Ea =27 and 24 kJ/mol, b=3.3 and 3.1 atm-1, k0.⋅a =83 and 26mA/cm2, respectively. By comparing these kinetic data with the corresponding values for Pt (167 mg)/KF-felt, 20 kJ/mol, 0.34 atm-1, and 167 mA/cm2, the Pd metal deposited on KFfelt clearly indicates an excellent catalytic activity in comparison with the Pt deposited in spite of a small amount of the deposit (2.4 mg/cm2).

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1988 (5), 714-718, 1988-05-10

    The Chemical Society of Japan

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