Manganese hexacyanoferrate/MnO2 composite nanostructures as a cathode material for supercapacitors
- 20 December 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 1 (7), 2621-2630
- https://doi.org/10.1039/c2ta01354a
Abstract
A composite of manganese hexacyanoferrate (MnHCF) coated by an amorphous manganese dioxide layer was synthesized by a facile co-precipitation method and a further step called “deep electro-oxidation”. The structure and components of the resulting MnHCF/MnO2 composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical testing showed a capacitance of 225.6 F g−1 at a sweep rate of 5 mV s−1 within a voltage range of 1.3 V and a high energy density of 74.5 W h kg−1 at a current density of 0.5 A g−1 during galvanostatic charge/discharge cycles, which is superior to most cathode materials, including some reported graphene/MnO2 nanocomposites. It is confirmed that the two components, manganese hexacyanoferrate and manganese dioxide, lead to an integrated electrochemical behavior and a capacitor with enhanced performance. The electrochemical testing and corresponding XPS analysis also demonstrated that the manganese coordinated by cyanide groups via nitrogen atoms in MnHCF did not get involved in the charge storage process during potential cycles.Keywords
This publication has 35 references indexed in Scilit:
- Morphology-Controllable Synthesis of Metal Organic Framework Cd3[Co(CN)6]2·nH2O Nanostructures for Hydrogen Storage ApplicationsCrystal Growth & Design, 2012
- Copper hexacyanoferrate battery electrodes with long cycle life and high powerNature Communications, 2011
- Materials for electrochemical capacitorsNature Materials, 2008
- Mixed‐Valence Li/Fe‐Based Metal–Organic Frameworks with Both Reversible Redox and Sorption PropertiesAngewandte Chemie-International Edition, 2007
- Carbon properties and their role in supercapacitorsJournal of Power Sources, 2006
- Charge Storage Mechanism of MnO2 Electrode Used in Aqueous Electrochemical CapacitorChemistry of Materials, 2004
- Adsorption of Co, Ni, Cu, and Zn on hydrous manganese dioxide from complex electrolyte solutions resembling sea water in major ion contentJournal of Colloid and Interface Science, 2003
- Principles and applications of electrochemical capacitorsElectrochimica Acta, 2000
- Adsorption of Phosphate on Manganese Dioxide in SeawaterEnvironmental Science & Technology, 1996
- A New Charge Storage Mechanism for Electrochemical CapacitorsJournal of the Electrochemical Society, 1995