Size-controllable synthesis of monodispersed nitrogen-doped carbon nanospheres from polydopamine for high-rate supercapacitors

2023, Volume 17, Issue 11

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Frontiers of Chemical Science and Engineering >> 2023, Volume 17, Issue 11 doi: 10.1007/s11705-023-2326-8

Size-controllable synthesis of monodispersed nitrogen-doped carbon nanospheres from polydopamine for high-rate supercapacitors

Received: 2023-01-14 Accepted: 2023-07-03 Available online: 2023-07-03

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Abstract

Monodispersed nitrogen-doped carbon nanospheres with tunable particle size (100–230 nm) were synthesized via self-polymerization of biochemical dopamine in the presence of hexamethylenetetramine as a buffer and F127 as a size controlling agent. Hexamethylenetetramine can mildly release NH_3, which in turn initiates the polymerization reaction of dopamine. The carbon nanospheres obtained exhibited a significant energy storage capability of 265 F·g^–1 at 0.5 A·g^–1 and high-rate performance of 82% in 6 mol·L^–1 KOH (20 A·g^–1), which could be attributed to the presence of abundant micro-mesoporous structure, doped nitrogen functional groups and the small particle size. Moreover, the fabricated symmetric supercapacitor device displayed a high stability of 94% after 5000 cycles, revealing the considerable potential of carbon nanospheres as electrode materials for energy storage.

Keywords

carbon nanospheres ; size-controlled ; nitrogen-doped ; high-rate ; supercapacitors

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