Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 43, Pages 29628-29636Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b08946
Keywords
polydopamine; silica nanocasting; hollow carbon nanoplates; carbon nanostructure; supercapacitors
Funding
- CSC scholarship
- Impuls- and Vernetzungsfonds of the Helmholtz Association [VH-NG-423]
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In this study, dispersible mesoporous nitrogen-doped hollow carbon nanoplates have been synthesized as a new anisotropic carbon nanostructure using gibbsite nanoplates as templates. The gibbsite-silica core shell nanoplates were first prepared before the gibbsite core was etched away. Dopamine as carbon precursor was self-polymerized on the hollow silica nanoplates surface assisted by sonification, which not only favors a homogeneous polymer coating on the nanoplates but also prevents their aggregation during the polymerization. Individual silica-polydopamine core shell nanoplates were immobilized in a silica gel in an insulated state via a silica nanocasting technique. After pyrolysis in a nanoconfine environment and elimination of silica, discrete and dispersible hollow carbon nanoplates are obtained. The resulted hollow carbon nanoplates bear uniform hexagonal morphology with specific surface area of 460 m(2).g(-1) and fairly accessible small mesopores (similar to 3.8 nm). They show excellent colloidal stability in aqueous media and are applied as electrode materials, for symmetric supercapacitors. When using polyvinylimidazolium-based nanoparticles as a binder in electrodes, the hollow carbon nanoplates present superior performance in parallel to polyvinylidene fluoride (PVDF) binder.
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