NDLI: Photochemical and electrocatalytic water oxidation activity of cobalt carbodiimide

Content Provider	Royal Society of Chemistry (RSC)
Author	Shalom, Menny Evangelisti, Fabio Patscheider, Jörg Patzke, Greta R. Ressnig, Debora Antonietti, Markus Moré, René
Copyright 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.
Starting Page	5072
Ending Page	5082
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	9
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta00369e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Carbodiimide Photochemistry Oxygen evolution Cobalt blue Oxygen Electrolysis Extended X-ray absorption fine structure X-ray crystallography Mathematical optimization Carbon Nitrogen
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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