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- 저자 : Ratke, L. (검색결과 2 건)
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A dual mesopore C-aerogel electrode for a high energy density supercapacitor
Dong-Won Park,Natalia A. Ca~nas,Marina Schwan,Barbara Milow,Lorenz Ratke,K. Andreas Friedrich 한국물리학회 2016 Current Applied Physics Vol.16 No.6
Energy and power-storage capability of supercapacitors are associated with the physical and chemical characteristics of carbon-based electrodes. Herein, we report the structural characteristics and electrochemical performance of carbon aerogels (C-aerogels) prepared via a simple sol-gel method without any activation process. The synthesized C-aerogel possesses a 3-D interconnected network structure, and was tested as the active electrode material in a symmetrical supercapacitor with an organic electrolyte. Cyclic voltammetry and galvanostatic charge/discharge measurements demonstrate the good electrochemical performance of the supercapacitor. A specific capacitance of 21.8 F$g1 at 2 A$g1 and cycle durability of 87% over 10,000 cycles was observed due to the presence of dual mesopores. These dual mesopores result in an enhanced access to reaction sites and facilitate electrolyte ion transport. Furthermore, they can afford a high energy density of 22.1 Wh kg1 at a power density of 2.4 kW$kg1.
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He, J.,Mattern, N.,Tan, J.,Zhao, J.Z.,Kaban, I.,Wang, Z.,Ratke, L.,Kim, D.H.,Kim, W.T.,Eckert, J. Elsevier Science 2013 ACTA MATERIALIA Vol.61 No.6
The Zr-Ce-La system is characterized by a miscibility gap and a monotectic reaction. It separates into Zr-rich and CeLa-rich liquids upon cooling through the gap. Based on this system, a new Zr-Ce-La-Al-Co monotectic system was created to synthesize liquid-phase-separated bulk metallic glasses (LPS-BMGs) by copper mold casting. A systematical investigation was performed for the effects of the relative atomic ratios of Zr:CeLa, Co:Al and Ce:La on the microstructure features and chemical compositions of the two coexistent phases. Dual atom pairs with positive heat of mixing (Zr-Ce: +12kJmol<SUP>-1</SUP> and Zr-La: +13kJmol<SUP>-1</SUP>) are originally adopted to develop such LPS-BMGs. A series of in situ formed LPS-BMGs with a critical thickness of 2.5mm has been successfully synthesized. By combining the kinetics of liquid-liquid phase separation with the formation of metallic glasses, the mechanisms of phase formation and the microstructure evolution in the rapidly cooled alloys are discussed in detail. Furthermore, a thermodynamic model is proposed for LPS-BMG design, attempting to build a bridge from monotectic/immiscible (M/I) alloys to LPS-BMGs. This work not only provides opportunities for new insights into the synthesis of LPS-BMGs and their properties but also opens new perspectives for processing and research of M/I alloys.
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