Abstract
Electrochemical properties of MnO2 nanosheets thin-film electrode for electrochemical capacitors were examined. MnO2 nanosheets were prepared by exfoliation of birnessite-type MnO2. MnO2 nanosheets with small lateral sizes of 50-100 nm (Small-NS) and large lateral sizes of approximately 1 μm (Large-NS) were obtained by multistep centrifugation. Thin films of MnO2 nanosheets were prepared by electrophoretic deposition. Films of Large-NS had a homogeneous microstructure like a bulk. Small-NS had a heterogeneous microstructure containing micropore. The reversible capacities for the films with thickness of approximately 12 nm were approximately 100 mAh g-1(330 F g-1). Capacities of Large-NS films decreased with increasing amount of nanosheets. Capacities of Small-NS films were almost independent of the amount of nanosheets due to fast ion diffusion in the electrodes. Heterogeneous microstructure containing micropore contributes to the good electrode properties of Small-NS films.
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