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Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storage.
Nanoscale Res Lett. 2014; 9(1):453.NR

Abstract

Nanocomposite electrodes having three-dimensional (3-D) nanoscale architecture comprising of vertically aligned ZnO nanorod array core-polypyrrole (PPy) conducting polymer sheath and the vertical PPy nanotube arrays have been investigated for supercapacitor energy storage. The electrodes in the ZnO nanorod core-PPy sheath structure are formed by preferential nucleation and deposition of PPy layer over hydrothermally synthesized vertical ZnO nanorod array by controlled pulsed current electropolymerization of pyrrole monomer under surfactant action. The vertical PPy nanotube arrays of different tube diameter are created by selective etching of the ZnO nanorod core in ammonia solution for different periods. Cyclic voltammetry studies show high areal-specific capacitance approximately 240 mF.cm(-2) for open pore and approximately 180 mF.cm(-2) for narrow 30-to-36-nm diameter PPy nanotube arrays attributed to intensive faradic processes arising from enhanced access of electrolyte ions through nanotube interior and exterior. Impedance spectroscopy studies show that capacitive response extends over larger frequency domain in electrodes with PPy nanotube structure. Simulation of Nyquist plots by electrical equivalent circuit modeling establishes that 3-D nanostructure is better represented by constant phase element which accounts for the inhomogeneous electrochemical redox processes. Charge-discharge studies at different current densities establish that kinetics of the redox process in PPy nanotube electrode is due to the limitation on electron transport rather than the diffusive process of electrolyte ions. The PPy nanotube electrodes show deep discharge capability with high coulomb efficiency and long-term charge-discharge cyclic studies show nondegrading performance of the specific areal capacitance tested for 5,000 cycles.

Authors+Show Affiliations

Electrical and Computer Engineering Department and Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, New York 13902, USA.Electrical and Computer Engineering Department and Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, New York 13902, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25246867

Citation

Sidhu, Navjot Kaur, and Alok C. Rastogi. "Vertically Aligned ZnO Nanorod Core-polypyrrole Conducting Polymer Sheath and Nanotube Arrays for Electrochemical Supercapacitor Energy Storage." Nanoscale Research Letters, vol. 9, no. 1, 2014, p. 453.
Sidhu NK, Rastogi AC. Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storage. Nanoscale Res Lett. 2014;9(1):453.
Sidhu, N. K., & Rastogi, A. C. (2014). Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storage. Nanoscale Research Letters, 9(1), 453. https://doi.org/10.1186/1556-276X-9-453
Sidhu NK, Rastogi AC. Vertically Aligned ZnO Nanorod Core-polypyrrole Conducting Polymer Sheath and Nanotube Arrays for Electrochemical Supercapacitor Energy Storage. Nanoscale Res Lett. 2014;9(1):453. PubMed PMID: 25246867.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storage. AU - Sidhu,Navjot Kaur, AU - Rastogi,Alok C, Y1 - 2014/08/31/ PY - 2014/05/30/received PY - 2014/08/21/accepted PY - 2014/9/24/entrez PY - 2014/9/24/pubmed PY - 2014/9/24/medline KW - 3-D nanostructures KW - Electrochemical energy storage KW - Polypyrrole nanotubes KW - Pulsed electrochemical polymerization KW - Redox capacitance KW - Supercapacitor KW - Zinc oxide nanorods SP - 453 EP - 453 JF - Nanoscale research letters JO - Nanoscale Res Lett VL - 9 IS - 1 N2 - Nanocomposite electrodes having three-dimensional (3-D) nanoscale architecture comprising of vertically aligned ZnO nanorod array core-polypyrrole (PPy) conducting polymer sheath and the vertical PPy nanotube arrays have been investigated for supercapacitor energy storage. The electrodes in the ZnO nanorod core-PPy sheath structure are formed by preferential nucleation and deposition of PPy layer over hydrothermally synthesized vertical ZnO nanorod array by controlled pulsed current electropolymerization of pyrrole monomer under surfactant action. The vertical PPy nanotube arrays of different tube diameter are created by selective etching of the ZnO nanorod core in ammonia solution for different periods. Cyclic voltammetry studies show high areal-specific capacitance approximately 240 mF.cm(-2) for open pore and approximately 180 mF.cm(-2) for narrow 30-to-36-nm diameter PPy nanotube arrays attributed to intensive faradic processes arising from enhanced access of electrolyte ions through nanotube interior and exterior. Impedance spectroscopy studies show that capacitive response extends over larger frequency domain in electrodes with PPy nanotube structure. Simulation of Nyquist plots by electrical equivalent circuit modeling establishes that 3-D nanostructure is better represented by constant phase element which accounts for the inhomogeneous electrochemical redox processes. Charge-discharge studies at different current densities establish that kinetics of the redox process in PPy nanotube electrode is due to the limitation on electron transport rather than the diffusive process of electrolyte ions. The PPy nanotube electrodes show deep discharge capability with high coulomb efficiency and long-term charge-discharge cyclic studies show nondegrading performance of the specific areal capacitance tested for 5,000 cycles. SN - 1931-7573 UR - https://www.unboundmedicine.com/medline/citation/25246867/Vertically_aligned_ZnO_nanorod_core_polypyrrole_conducting_polymer_sheath_and_nanotube_arrays_for_electrochemical_supercapacitor_energy_storage_ L2 - https://dx.doi.org/10.1186/1556-276X-9-453 DB - PRIME DP - Unbound Medicine ER -
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