Carbon Nanotube Thin Film Supported by Nickel Nanotube Array as Supercapacitor Electrode with Improved Rate Capability

Thumbnail Image
Date
2016-01-01
Authors
Monshat, Hosein
Major Professor
Advisor
SHAN HU
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Organizational Unit
Mechanical Engineering
The Department of Mechanical Engineering at Iowa State University is where innovation thrives and the impossible is made possible. This is where your passion for problem-solving and hands-on learning can make a real difference in our world. Whether you’re helping improve the environment, creating safer automobiles, or advancing medical technologies, and athletic performance, the Department of Mechanical Engineering gives you the tools and talent to blaze your own trail to an amazing career.
Journal Issue
Is Version Of
Versions
Series
Abstract

Functionalized carbon nanotube (f-CNT) thin films were deposited onto plain nickel foil, nickel foam and nickel nanotube (NiNT) arrays using electrophoretic deposition (EPD to fabricate a CNT-based supercapacitor. A two-dimensional multiphysics model of the EPD process was established to investigate f-CNT particles deposition on nickel substrates with constant voltage and constant current modes. Combined scanning electron microscopy and electrochemical analysis elucidate that the best rate capability is achieved when f-CNT thin films conformally wrap NiNTs and provide the fastest electron transport between active materials and current collectors. The effect of micro and nanostructured current collectors on the rate capability of CNT-nickel supercapacitors was studied by deposition of f-CNT on nickel foil, nickel foam as well as nickel nanotubes (NiNT). 51% capacity retention was calculated for NiNT/f-CNT when scanning rate was increased from 1 to 50 mV/sec in cyclic voltammetry test whereas, nickel foam/f-CNT and nickel foil/f-CNT kept 35% and 30% of their initial capacities in the same test. The specific capacitance of 200 F/g and capacitance retention of 90% after 1000 cycles was obtained for NiNT/f-CNT cell. Frequency analysis demonstrates a higher ability of NiNT/f-CNT to get polarized with the lowest dielectric relaxation time as small as 0.044 sec.

Comments
Description
Keywords
Citation
Source
Subject Categories
Copyright
Fri Jan 01 00:00:00 UTC 2016