Mn-W oxide anodes prepared by thermal decomposition for oxygen evolution in seawater electrolysis

K. Izumiya, E. Akiyama, H. Habazaki, N. Kumagai, A. Kawashima, K. Hashimoto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Manganese-tungsten oxide electrodes have high efficiency for oxygen evolution in seawater electrolysis. Manganese oxide, tungsten oxide and manganese-tungsten oxides were coated on the IrO2-coated titanium (IrO2/Ti electrode) by thermal decomposition. The oxygen evolution efficiencies at 200 A · m-2 of the manganese oxide and tungsten oxide electrodes in 0.5 M NaCl solution at pH 8 and 30°C were 70 and 68%, respectively. The efficiency for oxygen evolution is enhanced by small amounts of mutual additions into manganese oxide or tungsten oxide. In particular, the efficiencies of α-Mn2O3-type oxide with 15 mol% W6+ and WO3-type oxide with 10 mol% Mn2+ go up to over 92 and 86%, respectively. Further increase in additives leads to the formation of MnWO4 and to a significant decrease in the oxygen evolution efficiency.

Original languageEnglish
Pages (from-to)308-313
Number of pages6
JournalMaterials Transactions, JIM
Volume39
Issue number2
DOIs
Publication statusPublished - 1998 Feb

Keywords

  • Anode
  • Coating
  • Manganese oxide
  • Oxygen evolution
  • Oxygen evolution efficiency
  • Seawater
  • Thermal decomposition
  • Tungsten

ASJC Scopus subject areas

  • Engineering(all)

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