Back to Search
Start Over
Targeted design of α-MnO2 based catalysts for oxygen reduction
- Source :
- Electrochimica Acta. 191:452-461
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The paper focuses on theoretical and experimental aspects of an oxide surface optimization for oxygen reduction reaction (ORR). Various doped α-MnO2 based electrocatalysts were prepared by microwave-assisted hydrothermal synthesis and electrochemically characterized to validate density functional theory (DFT) based predictions of the oxidation state and local structure effects on the catalytic activity of α-MnO2 catalysts in ORR. Both theory and experiments conclude that the highest activity in ORR is to be expected in the case of clustered Mn3+ sites which yield activity comparable with that of the polycrystalline Pt. These active sites have to be formed under in-operando conditions and their formation is hindered in doped α-MnO2 catalysts. The activity of the other conceivable active sites based on non-clustered Mn3+ or Mn4+ is inferior to that of clustered Mn3+. The activation of Mn3+ or Mn4+ based active sites leads to a shift in selectivity of the ORR process towards 2 electron formation of hydrogen peroxide.
- Subjects :
- Chemistry
General Chemical Engineering
Inorganic chemistry
Oxide
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
Electrocatalyst
01 natural sciences
0104 chemical sciences
Catalysis
chemistry.chemical_compound
Oxidation state
Yield (chemistry)
Electrochemistry
Hydrothermal synthesis
Density functional theory
0210 nano-technology
Selectivity
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 191
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........41d04e01b04623a78d1562c196b43767