Abstract
Light-weight, porous carbon-based aerogels are one of the widely investigated materials for energy applications. Herein, we report the synthesis and characterizations of a carbonized aerogel prepared from zeolitic imidazolate framework (ZIF-8) particles and polymer agar. Noticeably, the agar matrix not only allows a uniform dispersion of the ZIF-8 but also initiates the formation of hollow ZIF-8 via partial etching of its core. The distinct well-distributed hollow ZIF-8 imparts high porosity, excellent surface area (1206 m2 g−1) and predominant amorphous phase to the carbonized aerogel framework. The estimated maximum specific capacitance (124.86 F g−1 at 0.25 A g−1) obtained with the carbonized ZIF-8 aerogel is mainly attributed to the hollow ZIF-8 particles with reduced Zn-content and KOH activation.
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