Experimental and theoretical evidences of p-type conductivity in nickel carbodiimide nanoparticles with a delafossite structure type - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2017

Experimental and theoretical evidences of p-type conductivity in nickel carbodiimide nanoparticles with a delafossite structure type

Laurent Cario
Camille Latouche
Stéphane Jobic

Résumé

Nickel carbodiimide (NiCN) 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/g). This layered material crystallizes in the 2H structure type of delafossite (space group P6/mmc), which is built upon infinite /[NiN] layers connected by linear carbodiimide ([N═C═N]) 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 N. 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 CuGaO and CuCrO delafossite oxides and NiO, prompted us to test NiCN nanoparticles as a photocathode in p-type dye-sensitized solar cells.
Fichier principal
Vignette du fichier
Inorganic Chemistry_NiNCN final.pdf (1.14 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01559094 , version 1 (10-07-2017)

Identifiants

Citer

Tengfei Jiang, Baptiste Polteau, Yoann Farré, Laurent Cario, Camille Latouche, et al.. Experimental and theoretical evidences of p-type conductivity in nickel carbodiimide nanoparticles with a delafossite structure type. Inorganic Chemistry, 2017, 56 (14), pp.7922-7927. ⟨10.1021/acs.inorgchem.7b00636⟩. ⟨hal-01559094⟩
153 Consultations
236 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More