Morphological Transformations and Electrochemical Properties of Hydrothermally Synthesized MnO2 Nanostructures

Ashwin Shahani

Assistant Professor

shahani@umich.edu

2034 H.H. Dow

T: (734) 764-5648

Bio

Publications


A. J Shahani, J. Wu, L. Wu, Q. Wang, and X. Zhou (2011)

In: Solid State Ionic Devices 8 - Nemca, ed. by Wachsman, ED and Bock, C and Hunter, G and Traversa, E, vol. 33(40), pp. 185-193, Electrochem Soc (ECS); Luminescence & Display Mat (LDM); Sensor; Corrosion; High Temp Mat; Energy Technol; Battery; Phys & Analyt Electrochem; New Technol Subcomm. ECS Transactions (ISBN: 978-1-60768-250-9).

MnO2 nanostructures with various morphologies were synthesized by the hydrothermal method with control over the reaction temperature and dwell time. One dimensional (1D) nanoneedle structure can self-assemble to form three dimensional (3D) microspheres of MnO2 nanoneedles at 95 degrees C by extending the dwell time from 3 hours to 15 hours. Alternatively, the 3D microspheres of nanoneedles can transform into 1D nanobelts and nanorods by increasing the reaction temperature to 120 degrees C and 165 degrees C, respectively, while maintaining constant dwell time of 15 hours. The supercapacitance of these nanostructures shows strong morphology dependence, and nanobelts have the highest specific capacitance of 323.7 F g(-1).

Symposium on Tutorials in Nanotechnology - Focus on Luminescence and Display Materials/218th Meeting of the Electrochemical-Society/High Resolution Characterization of Corrosion Processes 2/Symposium on Solid State Ionic Devices 8 - NEMCA, Las Vegas, NV, OCT 10-15, 2010

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