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Two dimensional heteroatoms-doped graphitic carbon electrode materials could exhibit better capacitive properties than undoped carbon materials. However, since the configuration and the content of the heteroatoms as well as their porous structure are difficult to control, the improvement of their energy storage performance is limited. Here, we report a hierarchically porous boron-doped graphitic carbon nitride nanosheet electrode material with high electrochemical energy storage performances, including high specific capacitances at a fast, carbon-like speed (620.0 F g −1 at 0.1 A g −1 and 312.0 F g −1 at 20 A g −1 ), a high energy density of 86.1 Wh kg −1 and a stable cycling durability with no capacitance declination after 2500 charge-discharge cycles. The improvement stems from the hierarchically porous structure with dominant pore sizes among 1–3 nm, increased pyrrolic nitrogen (11.12 at%) and boron (8.21 at%) active sites due to the addition of ionic liquid. This study has provided a new idea on improving the doping level and porous structure of the electrode material by using ionic liquid as both the heteroatoms source and pore template. [ABSTRACT FROM AUTHOR]

Abstract: Poly(diallyldimethylammonium chloride) functionalized helical carbon nanotubes (PDDA-HCNTs) were successfully synthesized. The resulting PDDA-HCNTs composite has good conductivity, solubility and ferromagnetic property. The fabricated HCNTs could be conveniently separated and magnetically attached to the magnetic electrode owing to their excellent magnetic properties. An amperometric biosensor was firstly developed based on glucose oxidase (GOD) functionalized PDDA-HCNTs loaded on magnetic glass carbon electrode. The constructed biosensor exhibited excellent electrocatalytic activity and stability for the detection of glucose with a linear range from 5 to 85μM and a low detection limit of 0.72μM at 3σ. The present work offers a new avenue to broaden the applications of HCNTs in electrochemical biosensors. [Copyright &y& Elsevier]