Shim, Jaeho Ko, Yohan Lee, Kyu Seung Partha, Khanra Lee, Chil-Hyoung Yu, Kyoungsik Koo, Hye Young Lee, Ki-Tae Seo, Won-Seon Son, Dong Ick 2024-01-20T00:01:07Z 2024-01-20T00:01:07Z 2021-09-03 2017-12-01 1359-8368 https://pubs.kist.re.kr/handle/201004/121945 This work reports on the in-situ chemical synthesis and their properties of the core (active material)/shell (conductive material) type Co3O4/graphene quantum dots (QDs). The stable oxygen bridge bonds between the Co3O4 core and the oxygen-related functional groups on the graphene shells facilitate the efficient charge/discharge performance. The efficient electron transfer process between the Co3O4 core and the graphene shell lead to an improvement in the electrochemical activity. The specific capacitances of Co3O4/graphene QDs electrode, without conductive additives, exhibit high values of 2435 F g(-1) at current densities of 1 A g-1. It breaks through 126% of the initial capacitance after 500 cycles and show above 112% even after 4500 cycles. The excellent performance of the Co3O4/G QDs electrode is attributed to the significant improvement of the electrochemical activity, without conductive additives, due to the presence of metal oxide QD covered by graphene shells which leads to the good electrical properties. (C) 2017 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD CHARGE SEPARATION GRAPHENE PERFORMANCE CO3O4 SUPERCAPACITORS NANOPARTICLES CONVERSION COMPOSITE OXIDATION STORAGE Conductive Co3O4/graphene (core/shell) quantum dots as electrode materials for electrochemical pseudocapacitor applications Article 10.1016/j.compositesb.2017.07.039 1 COMPOSITES PART B-ENGINEERING, v.130, pp.230 - 235 COMPOSITES PART B-ENGINEERING 130 230 235 scie scopus 000412613300022 2-s2.0-85026857876 Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Article CHARGE SEPARATION GRAPHENE PERFORMANCE CO3O4 SUPERCAPACITORS NANOPARTICLES CONVERSION COMPOSITE OXIDATION STORAGE Hybrid Nano-structures Chemical analysis Electron microscopy