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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(a) HRTEM images of CNC at an operational temperature of 750 °C, showing the typical high-resolution TEM images of the shell for a carbon nanocage, and (b) close-up of the carbon cage image and it fringes.