Hierarchical porous carbon based on the self-templating structure of rice husk for high-performance supercapacitors

Abstract

Hierarchical porous carbon based on the self-templating structure of rice husk was prepared for high-performance supercapacitors.

Direct carbonization of rice husk to prepare porous carbon for supercapacitor applications

“…The BET specific surface area of RHC is 337.5 m 2 g À1 . This value is higher than the sample prepared by direct carbonization in our previous work (19 m 2 g À1 ) [9]. RHPC, prepared from alkali etching of RHC, possesses a high surface area of 527 m 2 g À1 , this value is also higher than our previous carbon sample (247 m 2 g À1 , in our previous work) prepared from carbonization/etching method.…”

“…There is only one preparation process different from our previous work [9]. In our previous work, like most researches, N 2 was used to keep an inert environment during heat-treatment process.…”

“…These two self-activation reactions are the origins of the formation of pores in RHC and RHPC. It is believed that the higher specific surface area of RHPC compared with RHC is attributed to the removal of SiO 2 in RHC, and alkali etching is an essential process to prepare rice husk derived porous carbon [9].…”

Facile preparation of 3D hierarchical porous carbon from lignin for the anode material in lithium ion battery with high rate performance

“…380 C, lignin has been carbonized to carbon skeleton, the occupied space of KOH particles evolved into macropores in LHPC. On the other hand, the KOH particles in the lignin/KOH composite act as activating agent when the calcination temperature exceeds the molten point of KOH [20][21][22][23]. Thus, large numbers of mesopores and micropores were formed.…”

Synthesis of hierarchically porous MnO2/rice husks derived carbon composite as high-performance electrode material for supercapacitors

“…1(b), major constituents of rice husks are organic matters (cellulose, hemicellulose, lignin), silica and other mineral components [44]. On the basis of our previous work, both the unique silica distribution in rice husks and the inartificial vascular bundle structure can provide perfect template skeletons during the transformation process from organic matters into HPCs [45,46].…”