Radially aligned CNTs derived carbon hollow cylinder architecture for efficient energy storage

• Published in: Electrochimica acta 2020-09, Vol.354, p.136650, Article 136650
• Main Authors: Tripathi, Prashant, Bhatnagar, Ashish, Ramesh, A., Vishwakarma, Alok K., Singh, Sweta, Bailmare, Deepa B., Deshmukh, Abhay D., Gupta, Bipin Kumar, Srivastava, O.N.
• Format: Article
• Language: English
• Subjects: Areal capacity; Carbon; Carbon hollow cylinder; Carbon nanotubes (CNTs); Electrode materials; Electrodes; Energy storage; Geometry; Graphene; High aspect ratio; Structural design; Weight reduction
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2020.136650

To explore the practical feasibility of exotic carbon, various types of geometries of CNT configurations have been investigated such as CNT film, vertically aligned nanotubes, 3D pillared graphene-CNT network etc. High-performance and applicability of CNT derived electrodes in electrochemical energy storage depend on the structural design and high aspect ratio geometry. Here, we have strategically designed electrode derived from a special type of 3D geometry known as carbon hollow cylinders (CHCs) made up of CNTs arranged in the radial direction. The exceptional geometry provides a high areal capacity of 513.92 C/cm2 at an applied current density of 16 mA/cm2. Also, high specific energy of 41.13 mWh/cm2 at the specific power of 5694.92 mW/cm2 originated from supercapacitors and battery response of the electrode material was attained, which idealized the fundamental of theory of composite type electrode material. Hence, proposed geometry sets a stepping stone for a paradigm shift in light-weight electrode which is not only binder-free but also designed with a special geometry that provides an exceptional higher areal capacity with stable network.