Journal
CHEMPLUSCHEM
Volume 78, Issue 6, Pages 554-560Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201300095
Keywords
electrochemistry; graphite; manganese; nanotubes; organic-inorganic hybrid composites
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Funding
- A*STAR SERC [1021700144]
- Singapore MPA [23/04.15.03]
- Singapore National Research Foundation under CREATE program: EMobility in Megacities
- [NRF2009EWT-CERP001-026]
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Successful attempts have been made to control the synthesis of tubular MnOOH with nanodimensions on high electronic conductivity graphite felt (GF) to be used as a flexible supercapacitor electrode. As a fundamental study, the time-dependent kinetics was investigated to interpret its formation mechanism, which can be depicted as the curling of a two-dimensional precursor into a one-dimensional structure with a hollow interior. As a result of the nanotube structure, the active surface area of MnOOH is completely accessible to electrolyte ions and has a shorter charge-transport length and greater ability to withstand structural deformation. Hence, hollow-structured MnOOH shows great promise as an electrochemical system, which is reflected in its high specific capacitance of 1156Fg-1 at 1Ag-1. Furthermore, the high energy density of 1125Whkg-1 and power density of 5.05kWkg-1 reveal the outstanding energy-storage behavior of the MnOOH/GF composites as flexible supercapacitor electrodes.
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