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Báo cáo hóa học: " Facile Synthesis of Novel Nanostructured MnO2 Thin Films and Their Application in Supercapacitors"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Facile Synthesis of Novel Nanostructured MnO2 Thin Films and Their Application in Supercapacitors | Nanoscale Res Lett 2009 4 1035-1040 DOI 10.1007 S11671-009-9352-4 NANO EXPRESS Facile Synthesis of Novel Nanostructured MnO2 Thin Films and Their Application in Supercapacitors H. Xia W. Xiao M. O. Lai L. Lu Received 16 April 2009 Accepted 14 May 2009 Published online 2 June 2009 to the authors 2009 Abstract Nanostructured a-MnO2 thin films with different morphologies are grown on the platinum substrates by a facile solution method without any assistance of template or surfactant. Microstructural characterization reveals that morphology evolution from dandelion-like spheres to nanoflakes of the as-grown MnO2 is controlled by synthesis temperature. The capacitive behavior of the MnO2 thin films with different morphologies are studied by cyclic voltammetry. The a-MnO2 thin films composed of dandelion-like spheres exhibit high specific capacitance good rate capability and excellent long-term cycling stability. Keywords Supercapacitor MnO2 Nanostructure Thin film Cyclic voltammetry Introduction In recent years manganese oxides MnO2 have attracted considerable interests due to their distinctive physical and chemical properties and wide applications in catalysis ion exchange molecular adsorption biosensor and energy storage 1-5 . Specifically manganese oxides have been extensively evaluated as electrode materials for supercapacitors due to their low cost and environmental benignity compared to noble metal oxides such as RuO2 6-8 . In the development of supercapacitors nanostructured electrode materials have received great interests as they exhibit higher specific capacitance and rate capability compared to H. Xia W. Xiao M. O. Lai L. Lu H Department of Mechanical Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117576 Singapore e-mail luli@nus.edu.sg traditional bulk materials. Over the years various nanostructured manganese oxides including one-dimensional 1D nanorodes nanowires nanobelts nanoneedles and nanotubes two-dimensional 2-D .