ぺロブスカイト型酸化物La<sub>1-</sub><i><sub>x</sub></i>A<i><sub>x</sub></i>MnO<sub>3</sub>（A = Na, K, Rb）の濃アルカリ水溶液中での電気化学的酸素還元特性

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  • 林 政彦
    九州大学大学院総合理工学研究科物質理工学専攻
  • 兵頭 健生
    長崎大学工学部材料工学科
  • 三浦 則雄
    九州大学先端科学技術共同研究センター
  • 山添 曻
    九州大学大学院総合理工学研究科物質理工学専攻

書誌事項

タイトル別名
  • Electrochemical Oxygen Reduction Properties of Perovskite-type Oxides La<sub>1−</sub><i><sub>x</sub></i>A<i><sub>x</sub></i>MnO<sub>3</sub>(A = Na, K, Rb) in Concentrated Alkaline Solution
  • ペロブスカイト型酸化物La1-xAxMnO3(A=Na,K,Rb)の濃アルカリ水溶液中での電気化学的酸素還元特性
  • ペロブスカイトガタ サンカブツ La1-xAxMnO3 A Na K Rb ノ ノウアルカリ スイヨウエキ チュウ デ ノ デンキ カガクテキ サンソ カンゲン トクセイ

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<p>Oxygen reduction properties of gas diffusion-type oxygen electrodes loaded by 50 wt% with perovskite-type oxides, La1−xAxMnO3(A = Na, K, Rb, 0.0 ≦ x ≦ 0.2), were investigated in 8 mol dm−3 KOH aqueous solution at 60°C under air flow. Among these oxides, La0.8Rb0.2MnO3 gave the highest electrode performance, i.e., current density of 341 mA cm−2 at −150 mV vs. Hg/HgO. This oxide was found to be highly active for the direct 4-electron reduction of oxygen as revealed by a rotating ring-disk electrode (RRDE) analysis. Electrode performances changed with a change in A or x over the oxides, and tended to be higher with the oxide which exhibited a smaller amount of oxygen desorption in temperature-programmed desorption (TPD) experiments. On the basis of the iodometry and electron spin resonance (ESR) analysis, the 4-electron reduction was suggested to take place most favorably at the sites composed of a pair of Mn3+ and Mn4+ on the oxide surface. The electrode loaded with La0.8Rb0.2MnO3 was confirmed to be fairly stable over a continuous operation for 100 h under a galvanostatic condition of 300 mA cm−2. The same electrode allowed to construct a zinc-air battery with a maximum power density as large as 293 mW cm−2 at a cell voltage of 0.7 V.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 68 (2), 112-118, 2000-02-05

    公益社団法人　電気化学会

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