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Fan J.,Nanjing University of Aeronautics and Astronautics | Hong B.,China Jiliang University | Lu D.,Nanjing University of Aeronautics and Astronautics | Shi Y.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Physica B: Condensed Matter | Year: 2010

In the present work, the magnetic entropy change of the half-doped Nd 0.5Ca0.25Sr0.25MnO3 manganite has been investigated. The measurement of isothermal magnetization around Curie temperature reveals the maximum isothermal magnetic entropy change of 1.85 and 0.77J/kgK for ΔH = 3.0 and 1.0T magnetic field variation, respectively. In addition, from the data of heat capacity, we find the adiabatic temperature change of 0.88 K for a magnetic field variation of 3.0 T. Though only a moderate magnetic entropy change and a small adiabatic temperature change were obtained, a considerable large relative cooling power (140J/kg as ΔH = 3.0T) and a wide temperature range (74 K as ΔH = 3.0T) were found in this sample, this ensure it to be a promising candidate for the actual magnetic refrigerant materials. Crown Copyright © 2010 Published by Elsevier B.V. All rights reserved. Source


Kim J.-K.,Ulsan National Institute of Science and Technology | Yang W.,CAS Institute of Physics | Yang W.,Chinese Academy OfSciences | Salim J.,Indiana University - Purdue University Indianapolis | And 5 more authors.
Journal of the Electrochemical Society | Year: 2014

In this work, we demonstrate a lithium-water battery that uses oxygen dissolved in water as a cathode, Sr05Cea05CoO3-8 (SCCO)-copper nanoparticles as an efficient bifunctional catalyst, and with hybrid electrolytes. The SCCO-Cu composite catalyst exhibits an efficient and stable bifunctional catalytic activity, especially for the OER. The round-trip efficiency of the cell with SCCO-Cu nanoparticles catalyst reaches 84.1%, close to that of the 50% Pt/carbon-black catalyst (87.2%). The improved performance of the SCCO-Cu catalyst can be ascribed to the synergetic effect of SCCO and copper. The preliminary results demonstrate that the rechargeable lithium-water battery with oxygen dissolved in water flow can be achieved with high efficient and low cost oxide catalyst. This can be a good candidate for a large stationary energy storage system (ESS) with a low-cost. © 2013 The Electrochemical Society. All rights reserved. Source

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