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Photochemical and electrocatalytic water oxidation activity of cobalt carbodiimide
- Source :
- 'Journal of Materials Chemistry A ', vol: 3, pages: 5072-5082 (2015), J. Mater. Chem. A, Journal of Materials Chemistry A
- Publication Year :
- 2015
-
Abstract
- Cobalt carbodiimide is introduced as a heterogeneous non-oxidic water oxidation catalyst prototype with dual photochemical and electrocatalytic activity in neutral and basic media. CoNCN exhibits higher initial turnover frequencies of (TOF/SBET: 2.1 × 10−1) for visible-light-driven oxygen evolution than cobalt oxide catalysts (TOF/SBET: 3.5 × 10−3) and a 18% higher oxygen yield (Ru-dye sensitized standard setup). Furthermore, CoNCN maintains stable current densities in electrolysis over 20 h, and structural tuning through cationic substitution revealed that mixed (Co, Ni)NCN catalysts with low Ni contents display higher current densities than pristine CoNCN. A wide range of bulk (XAFS/EXAFS, XRD, FTIR) and surface (XPS, EELS, HRTEM) analytical methods together with catalytic parameter variations and reference experiments were performed to confirm the stability of CoNCN under standard operational conditions. The carbodiimide matrix thus offers a straightforward structural alternative to oxide systems and a clear-cut starting point for optimization strategies and for mechanistic studies on the possible role of active carbon or nitrogen sites. This paves the way to metal carbodiimides as a novel catalyst design platform for heterogeneous energy conversion systems.
- Subjects :
- 10120 Department of Chemistry
Materials science
Inorganic chemistry
Oxide
chemistry.chemical_element
2105 Renewable Energy, Sustainability and the Environment
1600 General Chemistry
02 engineering and technology
010402 general chemistry
Photochemistry
7. Clean energy
01 natural sciences
law.invention
Catalysis
chemistry.chemical_compound
law
540 Chemistry
General Materials Science
Cobalt oxide
Carbodiimide
Electrolysis
Renewable Energy, Sustainability and the Environment
Oxygen evolution
General Chemistry
021001 nanoscience & nanotechnology
2500 General Materials Science
0104 chemical sciences
chemistry
Catalytic oxidation
0210 nano-technology
Cobalt
Subjects
Details
- Language :
- English
- ISSN :
- 20507488
- Database :
- OpenAIRE
- Journal :
- 'Journal of Materials Chemistry A ', vol: 3, pages: 5072-5082 (2015), J. Mater. Chem. A, Journal of Materials Chemistry A
- Accession number :
- edsair.doi.dedup.....093725cc7febdabba00c2369f6a42fed