Co-precipitate precursor-based synthesis of new interstitial niobium molybdenum nitrides

Himri, Abdelouahad El; Himri, Mamoune El; Pérez-Coll, Domingo; Núñez, P.

doi:10.1007/s11164-014-1749-8

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…Transition metallic nitrides are formed by occupancy of nitrogen atoms into interstitial sites of metal lattice. 29,30 Volume expansion and corresponding lattice To further understand the obtained superior catalytic performance of metal nitride, morphology evolution of discharge products on the surface of CoN nanorods at different discharge/charge stages was investigated by SEM. The lying and the inbuilt disc-like Li 2 O 2 can be found on the surface of the full-discharged CoN nanorod after first cycle (Figure 6a), consistent with the corresponding TEM observation (Figure 4c).…”

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confidence: 99%

“…The preferred growth active site of Li 2 O 2 and its relevant particle size is closely related with the electronic density of states and charge density contour plots on the surface of catalyst. , The formation of relatively unbroken toroid-like discharge product in CoN cathode might be closely associated with the electronic density of states and charge density contour plots on the surface of catalyst. Transition metallic nitrides are formed by occupancy of nitrogen atoms into interstitial sites of metal lattice. , Volume expansion and corresponding lattice expansion of metal occurs, narrowing of the metallic d-band gap. Moreover, the mixing of d-orbitals of metal and p-orbitals of nitrogen to form d,p-bonding increases the electron density at Fermi energy (Figure S2).…”

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confidence: 99%

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Toward Lower Overpotential through Improved Electron Transport Property: Hierarchically Porous CoN Nanorods Prepared by Nitridation for Lithium–Oxygen Batteries

Zhu

Harris

et al. 2016

Nano Lett.

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To lower the overpotential of a lithium-oxygen battery, electron transport at the solid-to-solid interface between the discharge product Li2O2 and the cathode catalyst is of great significance. Here we propose a strategy to enhance electron transport property of the cathode catalyst by the replace of oxygen atoms in the generally used metal oxide-based catalysts with nitrogen atoms to improve electron density at Fermi energy after nitridation. Hierarchically porous CoN nanorods were obtained by thermal treatment of Co3O4 nanorods under ammonia atmosphere at 350 °C. Compared with that of the pristine Co3O4 precursor before nitridation, the overpotential of the obtained CoN cathode was significantly decreased. Moreover, specific capacity and cycling stability of the CoN nanorods were enhanced. It is assumed that the discharged products with different morphologies for Co3O4 and CoN cathodes might be closely associated with the variation in the electronic density induced by occupancy of nitrogen atoms into interstitial sites of metal lattice after nitridation. The nitridation strategy for improved electron density proposed in this work is proved to be a simple but efficient way to improve the electrochemical performance of metal oxide based cathodes for lithium-oxygen batteries.

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confidence: 99%

Toward Lower Overpotential through Improved Electron Transport Property: Hierarchically Porous CoN Nanorods Prepared by Nitridation for Lithium–Oxygen Batteries

Zhu

Harris

et al. 2016

Nano Lett.

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“…The ACC is stabilised against crystallisation due to the low temperature and complete solidification of the solvent, and subsequent sublimation of the frozen solvent then releases the as-formed ACC. 19,20 That ACC is formed during the freezing process itself is supported by the fact that if slow freezing rates are employed, calcite is obtained rather than ACC.…”

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Freeze-drying yields stable and pure amorphous calcium carbonate (ACC)

2013

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“…Ternary transition metal nitrides such as NbMoN produced by ammonolysis crystallise in the Fm-3m fcc cubic type as reported by Himri et al (2015) [105].…”

Section: Ternary Nitride Chalcogenidesmentioning

confidence: 56%