Authors: João Vitor Silva Moreira Paul William May Evaldo José Corat Alfredo Carlos Peterlevitz Romário Araújo Pinheiro Hudson Zanin
Publish Date: 2016/10/21
Volume: 46, Issue: 2, Pages: 929-935
Abstract
We report on the synthesis and electrochemical properties of diamond grown onto vertically aligned carbon nanotubes with high surface areas as a template resulting in a composite material exhibiting high doublelayer capacitance as well as low electrochemical impedance electrodes suitable for applications as supercapacitor devices We contrast results from devices fabricated with samples which differ in both their initial substrates Si and Ti and their final diamond coatings such as borondoped diamond and diamondlike carbon DLC We present for first time a conducting model for nondoped DLC thinfilms All samples were characterized by scanning and transmission electron microscopy and Fourier transform infrared and Raman spectroscopy Our results show specific capacitance as high as 825 F g−1 ∼1 F cm−2 and gravimetric specific energy and power as high as 07 W h kg−1 and 1764 W kg−1 respectively which suggest that these diamond/carbon nanotube composite electrodes are excellent candidates for supercapacitor fabricationWe would like to thank the LME/LNLSCampinas and the University of Bristol for microscope facilities and NANOBIO for the Autolab facility Also we gratefully acknowledge the Brazilian Agency Fapesp 2014/021637 and the Royal Society for Newton Travel Fund NI140181 for financial support
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