Doping of graphene with nitrogen is of much interest, since it improves the overall conductivity and supercapacitive properties. Besides conductivity, nitrogen doping also enhances the pseudo-capacitance due to fast and reversible surface redox processes. In this work, we have developed a cheap and easy process for synthesizing heavily nitrogen doped graphene (15% nitrogen) from non-mulberry silk cocoon membrane (Tassar, Antheraea mylitta) by pyrolyzing the cocoon at 400°C in argon atmosphere. Further we have investigated the performance of this heavily 'nitrogen doped graphene' (NDG) in a supercapacitor device. Our results suggest that NDG obtained from cocoon has improved supercapacitor performance. The improved performance is due to the high electronegativity of nitrogen that forms dipoles on the graphene surface. These dipoles consequently enhance the tendency of graphene to attract charged species to its surface. This is a green and clean synthesis approach for developing electronic materials for energy applications.
Bibliographical noteFunding Information:
This work is part of VS' and BT's doctoral thesis. VS acknowledges ‘Senior Research Fellowship from CSIR, India. RKS acknowledge financial support received from DST through SERB project no SR/S1/PC-31/2010. Part of the funding of this work is from MD's start up grant at IIT K ‘Exploring the novel semiconductor properties of pupal silk for applications in bioelectronics and biosensors’ IITK/BSBE/20100206 (2010-2011). M.R. gratefully acknowledges DST- SERB for proving him fellowship in DSTFast Track Start- Up Research Grant Scheme (file number- SB/FT/CS-199/2013).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)