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Jiang, T., Polteau, B., Farre, Y., Cario, L., Latouche, C., Pellegrin, Y., Boujtita, M., Odobel, F., Tessier, F., Chevire, F. & Jobic, S. (2017) Experimental and Theoretical Evidences of p-Type Conductivity in Nickel Carbodiimide Nanoparticles with a Delafossite Structure Type. Inorganic Chemistry, 56 7922–7927.
Added by: Richard Baschera (2017-10-24 13:30:33) Last edited by: Richard Baschera (2017-10-24 14:09:20) |
| Type de référence: Article DOI: 10.1021/acs.inorgchem.7b00636 Numéro d'identification (ISBN etc.): 0020-1669 Clé BibTeX: Jiang2017 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS, PMN Créateurs: Boujtita, Cario, Chevire, Farre, Jiang, Jobic, Latouche, Odobel, Pellegrin, Polteau, Tessier Collection: Inorganic Chemistry |
Consultations : 1/522
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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Nickel carbodiimide (NiCN2) was synthesized using a two-step precipitation-decomposition route leading to a brown powder with gypsum-flower-like morphology and a large specific surface area (75 m(2)/g). This layered material crystallizes in the 2H structure type of delafossite (space group P6(3)/mmc), which is built upon infinite 2/infinity[NiN2] layers connected by linear carbodiimide ([N=C=N](2-)) bridges. An X-ray diffraction Rietveld refinement and thermal analyses pointed out some nickel deficiencies in the material, and band structure calculations carried out on the defect compound predicted p-type conductivity in relation to a slight amount of N2-. This p-type conductivity was demonstrated by electrochemical impedance spectroscopy measurements, and a flat band potential of 0.90 V vs SCE at pH 9.4 was measured. This value, which is more positive than those of CuGaO2 and CuCrO2 delafossite oxides and NiO, prompted us to test NiCN2 nanoparticles as a photocathode in p-type dye-sensitized solar cells.
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