https://scholars.lib.ntu.edu.tw/handle/123456789/616361
標題: | Co3V2O8 hollow spheres with mesoporous walls as high-capacitance electrode for hybrid supercapacitor device | 作者: | Fahimi Z. Moradlou O. Sabbah A. Chen K.-H. Chen L.-C. Qorbani M. LI-CHYONG CHEN |
關鍵字: | bimetal oxide;hollow sphere;hybrid device;mesoporous;stability;supercapacitor | 公開日期: | 2022 | 卷: | 436 | 來源出版物: | Chemical Engineering Journal | 摘要: | Bimetal oxides are promising materials in the field of energy storage due to their various oxidation states, synergistic interactions among multiple metal species, and stability. In this work, Co3V2O8 hollow spheres are synthesized by a two-step hydrothermal method: (i) synthesis of V2O5 spheres and (ii) partial replacement of V by Co through the Kirkendall effect. As an electrode, it shows an extrinsic pseudocapacitive charge-storage mechanism due to different oxidation states of V and Co ions. Because of the low crystallinity degree of the mesoporous wall and high accessible surface area of hollow spheres, the optimum Co3V2O8 electrode reaches a high specific capacitance of 2376F g−1 at a current density of 2 A g−1, which is more than two times higher than the top reported values, and a rate capability retention of ∼80% at 20 A g−1. Using Co3V2O8, activated carbon, and KOH as positive, negative electrodes, and electrolyte, respectively, a hybrid supercapacitor device presents maximum energy and power densities of 59.2 Wh kg−1 and 36.6 kW kg−1, respectively. Further, the aqueous supercapacitor device shows superior structural and electrochemical stabilities after 10,000 galvanostatic charge–discharge cycles because of the arrays of voids in the orthorhombic crystal structure of Co3V2O8 that can decrease the volume expansion/shrinkage during the intercalation/deintercalation processes. Our results provide a platform for exploring bimetallic Co and V-based oxides, hydroxides, and sulfides nanostructures as promising energy storage materials in the future. © 2022 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124512521&doi=10.1016%2fj.cej.2022.135225&partnerID=40&md5=859a984511a53a650a4a88475d8ca227 https://scholars.lib.ntu.edu.tw/handle/123456789/616361 |
ISSN: | 13858947 | DOI: | 10.1016/j.cej.2022.135225 | SDG/關鍵字: | Activated carbon;Capacitance;Cobalt compounds;Cobalt deposits;Crystal structure;Crystallinity;Electric discharges;Electrodes;Electrolytes;Energy storage;Hydrothermal synthesis;Mesoporous materials;Potassium hydroxide;Spheres;Storage (materials);Sulfur compounds;Bimetal oxides;Capacitance electrodes;Hollow sphere;Hybrid devices;Hybrid supercapacitors;Mesoporous;Mesoporous walls;Multiple metals;Oxidation state;Synergistic interaction;Supercapacitor |
顯示於: | 凝態科學研究中心 |
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