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Toward an Active and Stable Catalyst for Oxygen Evolution in Acidic Media: Ti-Stabilized MnO2.
- Source :
- Advanced Energy Materials; Nov2015, Vol. 5 Issue 22, pn/a-N.PAG, 9p
- Publication Year :
- 2015
-
Abstract
- Catalysts are required for the oxygen evolution reaction, which are abundant, active, and stable in acid. MnO<subscript>2</subscript> is a promising candidate material for this purpose. However, it dissolves at high overpotentials. Using first-principles calculations, a strategy to mitigate this problem by decorating undercoordinated surface sites of MnO<subscript>2</subscript> with a stable oxide is developed here. TiO<subscript>2</subscript> stands out as the most promising of the different oxides in the simulations. This prediction is experimentally verified by testing sputter-deposited thin films of MnO<subscript>2</subscript> and Ti-MnO<subscript>2</subscript>. A combination of electrochemical measurements, quartz crystal microbalance, inductively coupled plasma mass spectrometry measurements, and X-ray photoelectron spectroscopy is performed. Small amounts of TiO<subscript>2</subscript> incorporated into MnO<subscript>2</subscript> lead to a moderate improvement in stability, with only a small decrease in activity. This study opens up the possibility of engineering surface properties of catalysts so that active and abundant nonprecious metal oxides can be used in acid electrolytes. [ABSTRACT FROM AUTHOR]
- Subjects :
- CATALYSTS
OXYGEN evolution reactions
OXIDES
THIN films
QUARTZ crystals
Subjects
Details
- Language :
- English
- ISSN :
- 16146832
- Volume :
- 5
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Advanced Energy Materials
- Publication Type :
- Academic Journal
- Accession number :
- 111003577
- Full Text :
- https://doi.org/10.1002/aenm.201500991