Mesoporous MnCo 2 O 4 spinel oxide for a highly active and stable air electrode for Zn-air rechargeable battery

Tatsumi Ishihara, Kenji Yokoe, Takayoshi Miyano, Hajime Kusaba

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Large-capacity rechargeable batteries for mobile devices are strongly required now, and the metal-air battery is currently considered as one of the most promising rechargeable batteries with a large capacity. In this study, oxygen reduction (ORR) and oxygen evolution reaction (OER) on mesoporous MnCo 2 O 4 spinel was studied for rechargeable Zn-air battery. Comparing the prepared spinel oxides containing Fe, it was found that the ORR/OER activity of MnCo 2 O 4 was reasonably high and stably cycled. Mesoporous MnCo 2 O 4 was successfully prepared by using a hard template method with mesoporous silica (SBA-15) for an inorganic template. The obtained mesoporous MnCo 2 O 4 showed the BET surface area of 108 m 2 /g and the average pore size of 2 nm. By increasing the surface area with mesoporous structure, overpotential of MnCo 2 O 4 to ORR/OER was much decreased. Zn-air battery was prepared by using mesoporous MnCo 2 O 4 as air electrode and 4 M KOH aqueous electrolyte, the stable discharge potential and capacity were exhibited at 1.05 V and 700 mAh/g -Zn , respectively. In addition, stable charge/discharge cycles were also sustained more than 200 cycles.

Original languageEnglish
Pages (from-to)455-460
Number of pages6
JournalElectrochimica Acta
Volume300
DOIs
Publication statusPublished - Mar 20 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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