Phosphorylated manganese oxide electrodeposited from ionic liquid as a stable, high efficiency water oxidation catalyst

Alex Izgorodin, Rosalie Hocking, Orawan Winther-Jensen, Matthias Hilder, Bjorn Winther Jensen, Douglas R. MacFarlane

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Efficient production of hydrogen via water splitting is an important goal that would represent a significant step towards truly sustainable supplies of energy. However, currently available catalysts for water electrolysis are either too low in efficiency or too unstable to be practical in this context. Recognizing the very high stability of manganese phosphate, we describe here a novel catalyst material based on manganese oxide that is both stabilized and sensitized by a surface phosphorylation reaction in an ionic liquid electrodeposition process. XPS and EXAFS data show that the surface of the MnOx contains phosphorous at P to Mn ratio of ∼1:2, indicating that the surface layer contains both phosphate characteristics and oxide characteristics. The catalyst stability was significantly enhanced compared to the previously reported manganese oxide catalysts and more than 25 h of continuous water oxidation is demonstrated.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalCatalysis Today
Volume200
Issue number1
DOIs
Publication statusPublished - 2013 Feb 1
Externally publishedYes

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Keywords

  • Ionic liquid
  • Manganese (IV) oxide
  • Water oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Izgorodin, A., Hocking, R., Winther-Jensen, O., Hilder, M., Winther Jensen, B., & MacFarlane, D. R. (2013). Phosphorylated manganese oxide electrodeposited from ionic liquid as a stable, high efficiency water oxidation catalyst. Catalysis Today, 200(1), 36-40. https://doi.org/10.1016/j.cattod.2012.06.007