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A new Zn|AlCl3|MnO2 galvanic cell suitable to water-activation

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Abstract

The Zn|3m AlCl3 (aq)|MnO2 galvanic cell gives an open circuit voltage (OCV) of 2.0V. When the cell is discharged at constant current (1.5 mA cm−2 or 50 mAg−1), its discharge curve shows a relatively flat portion in the region 2.0–1.6 V and the cell has an energy density of 550 Wh (kg of MnO2)−1 with a discharge capacity of 330 mA (kg of MnO2)−1, these values being about 2 times and 1.5 times, respectively, larger than those of the Zn|5m ZnCl2|MnO2 cell. The cell also shows good discharge behaviour at higher electric currents (for example 9.5 mAcm−2 or 240 mAg−1), and the advantages of the Zn|AlCl3|MnO2 cell over the Zn|ZnCl2|MnO2 are clear at the higher discharge currents. The high discharge voltage, energy density, and discharge capacity of the Zn|AlCl3|MnO2 cell are attributed to the strong buffering effect of AlCl3 at pH∼3. Due to this buffering effect, the electrolytic solution causes gradual corrosion of the zinc and, consequently, the cell is suited to water-activation.

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Authors and Affiliations

  1. Research Laboratory of Resources Utilization, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 227, Yokohama, Japan

    T. Yamamoto & T. Shoji

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  1. T. Yamamoto
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  2. T. Shoji
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Yamamoto, T., Shoji, T. A new Zn|AlCl3|MnO2 galvanic cell suitable to water-activation. J Appl Electrochem 20, 1021–1024 (1990). https://doi.org/10.1007/BF01019583

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  • DOI: https://doi.org/10.1007/BF01019583

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