Highly active screen-printed electrocatalysts for water oxidation based on β-manganese oxide

Monika Fekete, Rosalie K. Hocking, Lan-Yun Chang, Cristina Italiano, Antonio F. Patti, Francesco Arena, Leone Spiccia

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

A versatile screen-printing method is applied for the preparation of efficient water oxidation catalysts based on a nanostructured β-MnO 2 material prepared by a redox-precipitation method, and commercial β-MnO2. The catalyst films were tested for activity in water oxidation over a range of neutral to alkaline pH. The onset of water oxidation in case of the nanostructured MnO2 films is found at an overpotential (η) of 300 mV at pH 13.6 (1.0 M NaOH), with current densities reaching 10 mA cm-2 at η = 500 mV. The screen-printed MnO2 (nano) is one of the most active manganese oxide-based catalysts reported to date, despite consisting mostly of the common pyrolusite (β-MnO2) phase, so far generally found inactive in water oxidation. The films prepared from commercial β-MnO2 were found to be moderately active, with an onset of water oxidation at η = 500 mV (pH 13.6), and currents up to 5 mA cm-2 at η = 800 mV. At pH 6, the two samples exhibit similar activity and also match or surpass the performance of recent benchmark manganese oxides. X-ray absorption spectroscopy (XAS) studies suggest that the crystal phase is unchanged after prolonged electrochemical cycling. Scanning electron microscopy (SEM) analysis indicates very little corrosion of the surface morphology after prolonged catalyst operation at alkaline pH. However, high-resolution transmission electron microscopy (HRTEM) analysis shows the formation of a small amount of an amorphous phase on the surface of the nanorods after oxygen evolution over 12 hours in alkaline media.

Original languageEnglish (US)
Pages (from-to)2222-2232
Number of pages11
JournalEnergy and Environmental Science
Volume6
Issue number7
DOIs
StatePublished - Jul 1 2013
Externally publishedYes

Fingerprint

Manganese oxide
Electrocatalysts
manganese oxide
oxidation
Oxidation
catalyst
Water
Catalysts
water
X ray absorption spectroscopy
Screen printing
atomic absorption spectroscopy
High resolution transmission electron microscopy
Nanorods
X-ray spectroscopy
Surface morphology
transmission electron microscopy
corrosion
Current density
scanning electron microscopy

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

Highly active screen-printed electrocatalysts for water oxidation based on β-manganese oxide. / Fekete, Monika; Hocking, Rosalie K.; Chang, Lan-Yun; Italiano, Cristina; Patti, Antonio F.; Arena, Francesco; Spiccia, Leone.

In: Energy and Environmental Science, Vol. 6, No. 7, 01.07.2013, p. 2222-2232.

Research output: Contribution to journalArticle

Fekete, Monika ; Hocking, Rosalie K. ; Chang, Lan-Yun ; Italiano, Cristina ; Patti, Antonio F. ; Arena, Francesco ; Spiccia, Leone. / Highly active screen-printed electrocatalysts for water oxidation based on β-manganese oxide. In: Energy and Environmental Science. 2013 ; Vol. 6, No. 7. pp. 2222-2232.
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