TY - JOUR

T1 - Development of a technique and investigation of capacitance characteristics of electrode materials for supercapacitors based on nitrogen-doped carbon nanotubes

AU - Simenyuk, G. Yu

AU - Puzynin, A. V.

AU - Podyacheva, O. Yu

AU - Salnikov, A. V.

AU - Zakharov, Yu A.

AU - Ismagilov, Z. R.

PY - 2017

Y1 - 2017

N2 - Carbon nanotubes are widely employed as catalyst supports and electrode materials. In our earlier studies, capacitance characteristics of carbon nanotubes (CNTs) and nitrogen-doped carbon nanotubes (N-CNTs) were measured. Voltammetric curves obtained for nitrogen-doped nanotubes in an acid electrolyte showed pseudocapacitance peaks that were caused by electrochemical processes involving nitrogen-containing functional groups. In this study, measurements were made in a two-electrode cell of a supercapacitor with a hydrophilic polypropylene PORP-A1 film serving as a separator in alkaline (6 M KOH solution) and acid (1 M H2SO4 solution) electrolytes using a PARSTAT 4000 potentiostat/galvanostat. A technique was developed to estimate the contribution of electrical double layer (EDL) by subtracting pseudocapacitance from total capacitance of a cell using the Origin 9 software. The contribution of EDL and pseudocapacitance to the capacitance of supercapacitor cells was estimated. The highest capacitance of an electrode material equal to 97.2 F/g (including the EDL capacitance of 65 F/g) was reached for nanotubes doped with 8.5% of nitrogen in an acid electrolyte at a potential scanning rate of 10 mV/s.

AB - Carbon nanotubes are widely employed as catalyst supports and electrode materials. In our earlier studies, capacitance characteristics of carbon nanotubes (CNTs) and nitrogen-doped carbon nanotubes (N-CNTs) were measured. Voltammetric curves obtained for nitrogen-doped nanotubes in an acid electrolyte showed pseudocapacitance peaks that were caused by electrochemical processes involving nitrogen-containing functional groups. In this study, measurements were made in a two-electrode cell of a supercapacitor with a hydrophilic polypropylene PORP-A1 film serving as a separator in alkaline (6 M KOH solution) and acid (1 M H2SO4 solution) electrolytes using a PARSTAT 4000 potentiostat/galvanostat. A technique was developed to estimate the contribution of electrical double layer (EDL) by subtracting pseudocapacitance from total capacitance of a cell using the Origin 9 software. The contribution of EDL and pseudocapacitance to the capacitance of supercapacitor cells was estimated. The highest capacitance of an electrode material equal to 97.2 F/g (including the EDL capacitance of 65 F/g) was reached for nanotubes doped with 8.5% of nitrogen in an acid electrolyte at a potential scanning rate of 10 mV/s.

KW - Carbon nanotubes

KW - Electric capacitance

KW - Electrical double layer

KW - Electrode materials

KW - Pseudocapacitance

KW - Supercapacitors

UR - http://www.scopus.com/inward/record.url?scp=85034834250&partnerID=8YFLogxK

U2 - 10.18321/ectj663

DO - 10.18321/ectj663

M3 - Article

AN - SCOPUS:85034834250

VL - 19

SP - 201

EP - 208

JO - Eurasian Chemico-Technological Journal

JF - Eurasian Chemico-Technological Journal

SN - 1562-3920

IS - 3

ER -