journal article·2017-06-07

Facile Synthesis of Three-Dimensional Sandwiched MnO2@GCs@MnO2 Hybrid Nanostructured Electrode for Electrochemical Capacitors

Xian Jian, Shiyu Liu, Yuqi Gao, Wanli Zhang, Weidong He, Asif Mahmood, Chandrasekar M. Subramaniyam, Xiaolin Wang, Nasir Mahmood, Shi Xue Dou

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Abstract

Designable control over the morphology and structure of active materials is highly desirable for achieving high-performance devices. Here, we develop a facile microwave-assisted synthesis to decorate MnO2 nanocrystals on three-dimensional (3D) graphite-like capsules (GCs) to obtain sandwich nanostructures (3D MnO2@GCs@MnO2) as electrode materials for electrochemical capacitors (ECs). A templated growth of the 3D GCs was carried out via catalytic chemical vapor deposition and MnO2 was decorated on the exterior and interior surfaces of the GC walls through microwave irradiation to build an engineered architecture with robust structural and morphological stability. The unique sandwiched architecture has a large interfacial surface area, and allows for rapid electrolyte diffusion through its hollow/open framework and fast electronic motion via the carbon backbone. Furthermore, the tough and rigid nature of GCs provides the necessary structural stability, and the strong synergy between MnO2 and GCs leads to high electrochemical activity in both neutral (265.1 F/g at 0.5 A/g) and alkaline (390 F/g at 0.5 A/g) electrolytes. The developed hybrid exhibits stable capacitance up to 6000 cycles in 1 M Na2SO4. The hybrid is a potential candidate for future ECs and the present study opens up an effective avenue to design hybrid materials for various applications.
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Research context

OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center of Micro-Nano Functional Materials and Devices, School of Energy Science and Engineering, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 611731, China

Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong , North Wollongong, 2500, Australia

Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing 178001, China

Department of Physics, South University of Sciences and Technology , Shenzhen 518055, China

Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin University , Tianjin 300072, China

Funding

Ministry of Science and Technology of the People's Republic of China · Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · Department of Industry and Science, Australian Government · National Natural Science Foundation of China · Sichuan Province

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