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| Effect of Secondary Sintering Atmosphere on the Catalytic Activity of La0.7Sr0.3MnO3 for Oxygen Reduction |
WANG Guangjin1,2, CHENG Fan1, XU Tian2, YU Yi2, WEN Sheng1, GONG Chunli1,
LIU Hai1, WANG Jie1, ZHENG Genwen1, PAN Mu2
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1 College of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 432000;
2 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Hubei Provincial Key Laboratory of Fuel Cell, Wuhan University of Technology, Wuhan 430070; |
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Abstract Herein, manganese-based pervoskite oxide was prepared by a sol-gel method combined with secondary sintering technology, and then characterized by means of XRD and EDS to analyze its phase and element composition, electrochemical measurement to investigate its catalytic activity for oxygen reduction reaction. XRD and EDS results showed that the phase of La0.7Sr0.3MnO3 remained intact after secondary sintering treatment under N2 atmosphere, while was destroyed under NH3 atmosphere. The electrochemical results showed that the catalytic activity of the catalyst prepared under N2 atmosphere for oxygen reduction reaction is hi-gher than that of catalyst prepared under NH3 atmosphere. The onset potential for oxygen reduction and limited current density are 0.028 V (vs. Hg/HgO) and 2.181 mA·cm-2 (2 000 r/mim), respectively.
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Published: 25 January 2017
Online: 2018-05-02
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1 Yu Y, Li H, Wang H, et al. A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies [J]. J Power Sources,2012,205:10.
2 NØrskov J K, Rossmeisl J, Logadottir A, et al. Origin of the overpotential for oxygen reduction at a fuel-cell cathode [J]. J Phys Chem B,2004,108(46):17886.
3 Fernandes A C, Paganin V A, Ticianelli E A. Degradation study of Pt-based alloy catalysts for the oxygen reduction reaction in proton exchange membrane fuel cells [J]. J Electroanalytical Chem,2010,648(2):156.
4 Miyazaki K, Sugimura N, Matsuoka K, et al. Perovskite-type oxi-des La1- xSrxMnO3 for cathode catalysts in direct ethylene glycol alkaline fuel cells [J]. J Power Sources,2008,178(2):683.
5 Li D, Li S, Pan M. Study on the catalytic activity of perovskite-type oxide La0.65Sr0.3MnO3 for oxygen reduction [J]. J Hubei University: Nat Sci Ed,2011,33(1):99(in Chinese).
李丹林,李赏,潘牧.钙钛矿型氧化物 La0.65Sr0.3MnO3对氧还原的催化活性研究 [J]. 湖北大学学报:自然科学版,2011,33(1):99.
6 Xu T, Wang G, Yu Y, et al. Study on the electrochemical and kinetic characteristics of La0.7Sr0.3MnO3 [J]. Chinese Battery Ind,2012,17(6):365(in Chinese).
徐甜,汪广进,余意,等.La0.7Sr0.3MnO3 电化学特征及氧还原动力学研究 [J].电池工业,2012,17(6):365.
7 Wang G, Xu T, Wen S, et al. Structure-dependent electrocatalytic activity of La1-xSrxMnO3 for oxygen reduction reaction [J]. Sci China Chem,2015,58(5):871.
8 Suntivich J, Gasteiger H A, Yabuuchi N, et al. Design principles for oxygen-reduction activity on perovskite oxide catalysts for fuel cells and metal-air batteries [J]. Nat Chem,2011,3(7):546.
9 Wang Y, Cheng H P. Oxygen reduction activity on perovskite oxide surfaces: A comparative first-principles study of LaMnO3, LaFeO3, and LaCrO3 [J]. J Phys Chem C,2013,117(5):2106.
10 Tulloch J, Donne S W. Activity of perovskite La1-xSrxMnO3 catalysts towards oxygen reduction in alkaline electrolytes [J]. J Power Sources,2009,188(2):359.
11 Xu T, Wang G, Liang C, et al. N-doped La2Zr2O7 as an enhanced electrocatalyst for oxygen reduction reaction [J]. Electrochimica Acta,2014,143:83.
12 Atsumi T, Kamegashira N. Decomposition oxygen partial pressures of Ln1-xSrxMnO3 (Ln= La, Nd and Dy) [J]. J Alloys Compd,1997,257(1):161.
13 Andrieux M, Picard C. Nonstoichiometry and phase stability of La0.8Sr0.2MnO3±δ at 1273 K [J]. J Mater Sci Lett,2000,19(8):695.
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