Electrochemical capacitance of polypyrrole–titanium nitride and polypyrrole–titania nanotube hybrids

Abstract

Both polypyrrole-titanium nitride (PPy-TiN) and polypyrrole-titania (PPy-TiO 2 ) nanotube hybrids have been prepared by incorporating electroactive polypyrrole into well-aligned titanium nitride and titania nanotube arrays through a normal pulse voltammetry deposition process. Microstructure characterization shows that the polypyrroles have been fully coated on the titanium nitride and titania nanotube arrays to form coaxial heterogenous nanohybrids. The galvanostatic charge-discharge measurements indicate that the PPy-TiN and PPy-TiO 2 nanotube hybrids have specific capacitances of 1265 and 382 F g À1 at a current density of 0.6 A g À1 . Both nanotube hybrids have similar cyclability, exhibiting stable capacitances of 459 and 72 F g À1 after 2000 cycles at a high current density of 15 A g À1 . The highly conductive titanium nitride substrate can promote the electrochemical capacitance of polypyrrole more significantly, as compared to the titania semiconductor, contributing to a higher supercapacitance performance of PPy-TiN. This indicates that PPy-TiN nanotube hybrids can be more suitable to act as supercapacitor electrode materials.

Fabrication of flexible polypyrrole/graphene oxide/manganese oxide supercapacitor

“…The ESR values were detected at the first x‐axis intercepting point and comprised the total resistance from the electrolyte and electrode . On the other hand, R ct shows the charge transfer rate at the electrode and electrolyte interface, which further incurs the Faradaic redox process . R ct can be determined from the diameter of the semicircle formed.…”

All Metal Nitrides Solid‐State Asymmetric Supercapacitors

“…They include carbon coating, [22][23][24] carbon nanotube encapsulation, [ 25,26 ] graphene wrapping, [27][28][29][30] and forming core-shell structures with TiO 2 , [ 31 ] VN, [ 32 ] and MnO 2 , [ 33 ] as well as decoration with polymers such as polypyrrole, [ 34 ] polyaniline, [ 35,36 ] and PEDOT. [ 37 ] Those methods showed high effi ciency in enhancing TiN cycling and rate properties.…”

Electrochemical Performance of Transition Metal‐Coordinated Polypyrrole: A Mini Review

“…[23,24] The PPy/ TiN nanotube hybrid could keep the capacitance of 1077 F g À1 (based on active mass of PPy) at 1.0 A g À1 and capacitance retention of 72.6 % after 2000 cycles in 1.0 M H 2 SO 4 electrolyte, which is due to high porous structure and high conductivity of TiN nanotube array. [25,26] Similarly, PPymodified titanium foam electrode also could exhibit high capacitance of 855 F g À1 at 1.0 A g À1 and keep capacitance retention ratio of 81.1 % after 1000 cycles in 0.5 M K 2 SO 4 electrolyte. [27] In addition, the electrochemical performance of metallic-coordinated PPy supercapacitor is superior to the [a] Y. Xie School of Chemistry and Chemical Engineering Southeast University Nanjing 211189, China E-mail: ybxie@seu.edu.cn previously reported PPy composites, such as 56 Wh kg À1 for polypyrrole/activated carbon supercapacitors, [28] 29 Wh kg À1 for polypyrrole nanotube supercapacitor, [29] and 11 Wh kg À1 for polypyrrole/graphene oxide/ZnO supercapacitor.…”