Multi-dimensional nanocarbons hybridized with silicon oxides and their application for electrochemical capacitors
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We report a facile and versatile strategy to prepare multi-dimensional nanocarbons hybridized with mesoporous SiO2. Carbon nanoplatelets (CNPs, two-dimensional structure of nanocarbons) were combined with carbon nanotubes (CNTs, one-dimensional nanocarbons) to form multi-dimensional carbons (2D–1D, CNP–CNTs). The CNP–CNTs were synthesized by directly growing CNTs on CNPs. A simple solution-based process using TEOS (tetraethyl orthosilicate) resulted in coating or hybridizing CNP–CNTs with mesoporous silica to produce CNP–CNTs@SiO2. The nanocarbons’ surface area significantly increased as the amount of TEOS increased. Electrochemical characterizations of CNP–CNTs@SiO2 as supercapactior electrodes including cyclic voltammetry and galvanostatic charge–discharge in 3 M KOH (aq) reveal excellent-specific capacitance of 23.84 mF cm−2 at 20 mV s−1, stable charge–discharge operation, and low internal resistance. Our work demonstrates mesoporous SiO2 on nanocarbons have great potential in electrochemical energy storage.
KeywordsNanocarbons Carbon nanoplatelets Carbon nanotubes Silica Supercapacitors
This work was supported by the Technology Innovation Program (10052774, Development of hybrid supercapacitor by nanostructure carbon for ISG Applications) funded by the Ministry of Trade, Industry and Energy (MI, Korea). This study was supported by World Premier Materials (WPM) Program (10037890) funded by the Ministry of Trade, Industry and Energy (MI) of Korea.
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