Synthesis and characterization of carbon black/manganese oxide air cathodes for zinc-air batteries

Po Chieh Li, Chi Chang Hu, Tai Chou Lee, Wen Sheng Chang, Tsin Hai Wang

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Due to the poor electric conductivity but the excellent catalytic ability for the oxygen reduction reaction (ORR), manganese dioxide in the α phase (denoted as α-MnO2) anchored onto carbon black powders (XC72) has been synthesized by the reflux method. The specific surface area and electric conductivity of the composites are generally enhanced by increasing the XC72 content while the high XC72 content will induce the formation of MnOOH which shows a worse ORR catalytic ability than α-MnO2. The ORR activity of such air cathodes have been optimized at the XC72/α-MnO 2 ratio equal to 1 determined by the thermogravimetric analysis. By using this optimized cathode under the air atmosphere, the quasi-steady-state full-cell discharge voltages are equal to 1.353 and 1.178 V at 2 and 20 mA cm-2, respectively. Due to the usage of ambient air rather than pure oxygen, this Zn-air battery shows a modestly high discharge peak power density (67.51 mW cm-2) meanwhile the power density is equal to 47.22 mW cm-2 and the specific capacity is more than 750 mAh g-1 when this cell is operated at 1 V.

Original languageEnglish
Pages (from-to)88-97
Number of pages10
JournalJournal of Power Sources
Volume269
DOIs
StatePublished - 10 Dec 2014

Keywords

  • Alpha phase
  • Carbon black
  • Manganese dioxide
  • Oxygen reduction reaction
  • Zinc-air battery

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