Abstract
A new concept for affordable supercapacitors based on Al aqueous electrolytes was proposed recently. This study provides a deeper insight into the cyclic performance of vine shoots-derived activated carbon using three different 1 M aqueous electrolytes: Al2(SO4)3, Al(NO3)3 and AlCl3. Cyclic voltammetry (CV), galvanostatic cycling and impedance measurements have shown that the type of anion causes the differences in the rate capability and long-term cyclability. Although CV deviation is provoked by aggravated sulphate penetration into pores upon switching at higher currents, Al2(SO4)3 emerged as the most promising electrolyte solution due to the best cycling stability of the 1.5 V full cell over 15,000 cycles. Intensive oxidation of the positive electrode during initial cycling, induced by nitrates reduction, is the main reason for the fastest capacitance drop observed in Al(NO3)3. Therefore, the capacitance values of the carbon cell measured after 5,000 cycles in Al(NO3)3 (75 F g-1) are two times lower than the corresponding values in Al2(SO4)3 and AlCl3 (131 and 127 F g-1, respectively). The oxidation becomes more pronounced only after 10,000 cycles in AlCl3, thus causing a notable capacitance drop, which is not evidenced in Al2(SO4)3. Al2(SO4)3-based cell can withstand 15,000 with good specific capacitance/energy retention.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callSimilar Papers
More From: Journal of Electrochemical Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
