TY - JOUR

T1 - Nitrogen doped carbon nanotubes and nanofibers

T2 - Composition, structure, electrical conductivity and capacity properties

AU - Podyacheva, Olga Yu

AU - Cherepanova, Svetlana V.

AU - Romanenko, Anatoly I.

AU - Kibis, Lidiya S.

AU - Svintsitskiy, Dmitry A.

AU - Boronin, Andrei I.

AU - Stonkus, Olga A.

AU - Suboch, Arina N.

AU - Puzynin, Andrei V.

AU - Ismagilov, Zinfer R.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Structurally different nitrogen doped nanotubes and nanofibers (N-CNTs and N-CNFs) synthesized by a standard method of decomposing ethylene-ammonia mixtures on metal catalysts were studied. In N-CNTs the uniform distribution of nitrogen and the formation of the ordered defects were registered. The ordered defects comprise four carbon vacancies and pyridine-like nitrogen, according to the performed structural simulation. On the contrary, N-CNFs were found to have the non-uniform distribution of nitrogen; their structural defects are disordered and also contain the pyridine-like nitrogen. An increase in the nitrogen content in N-CNTs, and hence in the amount of ordered defects, leads to a monotonic decrease in conductivity. For N-CNFs the dependence of conductivity on the nitrogen content is non-monotonic and is characterized by the extremum due to the competition of electron doping and structure disordering. A similar enhancement of the electrode capacity with raising the nitrogen content both in N-CNTs and N-CNFs was observed and explained by improved hydrophilic properties of the nitrogen doped carbon nanomaterials.

AB - Structurally different nitrogen doped nanotubes and nanofibers (N-CNTs and N-CNFs) synthesized by a standard method of decomposing ethylene-ammonia mixtures on metal catalysts were studied. In N-CNTs the uniform distribution of nitrogen and the formation of the ordered defects were registered. The ordered defects comprise four carbon vacancies and pyridine-like nitrogen, according to the performed structural simulation. On the contrary, N-CNFs were found to have the non-uniform distribution of nitrogen; their structural defects are disordered and also contain the pyridine-like nitrogen. An increase in the nitrogen content in N-CNTs, and hence in the amount of ordered defects, leads to a monotonic decrease in conductivity. For N-CNFs the dependence of conductivity on the nitrogen content is non-monotonic and is characterized by the extremum due to the competition of electron doping and structure disordering. A similar enhancement of the electrode capacity with raising the nitrogen content both in N-CNTs and N-CNFs was observed and explained by improved hydrophilic properties of the nitrogen doped carbon nanomaterials.

KW - ENHANCED PHOTOCATALYTIC CAPABILITY

KW - RAY PHOTOELECTRON-SPECTROSCOPY

KW - POWDER DIFFRACTION PATTERNS

KW - RAMAN-SPECTROSCOPY

KW - FORMIC-ACID

KW - ETHYLENE/AMMONIA MIXTURE

KW - ELECTRONIC-PROPERTIES

KW - HYDROGEN-PRODUCTION

KW - LITHIUM STORAGE

KW - VISIBLE-LIGHT

UR - http://www.scopus.com/inward/record.url?scp=85021680205&partnerID=8YFLogxK

U2 - 10.1016/j.carbon.2017.06.094

DO - 10.1016/j.carbon.2017.06.094

M3 - Article

AN - SCOPUS:85021680205

VL - 122

SP - 475

EP - 483

JO - Carbon

JF - Carbon

SN - 0008-6223

ER -