B/N co-doped porous carbon nanosheets with high B/N doping contents and excellent supercapacitor performance

作者：Jing Huang, Peng Jiang, Junqing Zeng, Liping Zheng, Huajie Chen · 发表于：Journal of Energy Storage · 年份：2024 · DOI：10.1016/j.est.2024.111514 · 被引用次数：68 · 研究领域：Supercapacitor Materials and Fabrication、Advancements in Battery Materials、Electrospun Nanofibers in Biomedical Applications

Despite the important advances on B/N co-doped porous carbons (BNCs), integrating high B/N-doping content and hierarchical porosity into carbon nanosheets remains a challenging task for supercapacitor application. Herein, we report a novel BNC nanosheet with both expected properties through one-step H 3 BO 3 -mediated carbonization/activation of a newly-developed N/O-rich polymer (DPP). In such a mixture system, an in-suit crossing-linked DPP@H 3 BO 3 composite is formed due to the formation of multiple intermolecular hydrogen bonds between the H 3 BO 3 and the ester groups of DPP. The improved thermal stability for such a composite enables the fixation of more B-/N-bearing species in the carbon skeleton during carbonization . Particularly the nanosheet-like BNC-850 shows a rather high B/N content (6.63/7.27 at.%), a large S BET value (766.5 m 2 g −1 ), and a hierarchical porosity, all of which are in favor of electrochemical performance in both aqueous supercapacitors and zinc-ion capacitors (ZICs). In 6 M KOH electrolyte, the BNC-850 electrodes deliver an impressive capacitance of 341.5 F g −1 at 0.5 A g −1 , a high capacitance retention of 79.2 % at 20 A g −1 , and a good cycling stability (95 % capacitance retention over 10,000 cycles at 5 A g −1 ). The energy density of BNC-850-based ZICs is as high as 126.0 Wh kg −1 at 459.0 W kg −1 , exhibiting an outstanding superiority compared to the reported carbon-based ZICs. This work offers a facile strategy for accessing BNCs w...