Abstract
Hierarchically porous carbon aerogels (CAs) were prepared by organic condensation gelation method combined with atmospheric drying and pore-formation technology, followed by a carbonization process. With as-prepared CAs as substrate, the transition metal oxide nanoparticles loaded CAs composites (MnO2/Mn2O3@CA and Ni/NiO@CA) were achieved by means of liquid etching method combined with heat treatment, respectively. The catalyst, pore-forming agent and etching have important roles on the apparent density and pore structure of CAs. The hydrochloric acid (catalyst) significantly accelerates the gelation process and influences the size and distribution of macropores, whereas the addition of PEG2000 (pore-forming agent) and the etching of liquid solution leads to the formation of mesopore structure in CAs. Appropriate amounts of hydrochloric acid and PEG2000 allow the formation of hierarchically porous CAs with a BET surface area of 482.9 m2·g−1 and a macropore size of 11.3 μm. After etching and loading, the framework of CAs is etched to become a mesoporous structure, and the transition metal oxide nanoparticles can be uniformly loaded in CAs. These resultant composites have promising application in super capacitor, electrocatalysis, batteries and other fields.
Highlights
Carbon aerogel (CA), as a derivative of organic aerogel, is usually based on the polycondensation of resorcinol (R) and formaldehyde (F) [1]
1, synthesis and the typical images are oxides provided to more demonstrate theinsynthesis and the typical images are provided to more intuitively demonstrate the synthesis process
Initial red andby porous organic aerogels are synthesized via a sol-gol process accompanied by accompanied pore-formation technology, and the xerogel is mainly composed of pore-forming pore-formation technology, and the xerogel is mainly composed of pore-forming agent (PEG)
Summary
Carbon aerogel (CA), as a derivative of organic aerogel, is usually based on the polycondensation of resorcinol (R) and formaldehyde (F) [1] It is a kind of porous amorphous carbon nano-material with a 3D interconnected structure, high porosity (>80%), large specific surface area (usually 400~1100 m2 ·g−1 before activation) and a particle diameter of around 3~20 nm [2]. CAs, and can the by a liquid etching process and heat phase treatment More the importantly, these composite supporting structure stabilizes active components, which will extend the practical applications in incorporate a secondary phase to improve the electrochemical activities of CAs, and the supporting energy storage for CAs. structure stabilizes active components, which will extend the practical applications in energy storage for CAs
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
