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Three-dimensional hierarchical ternary aerogels of ultrafine TiO2 [email protected] carbon nanofibers-reduced graphene oxide for high-performance lithium-ion capacitors
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-10-09 , DOI: 10.1016/j.electacta.2018.10.037
Cheng Yang , Jin-Le Lan , Chenfeng Ding , Feng Wang , Sajid Hussain Siyal , Yunhua Yu , Xiaoping Yang

A novel three-dimensional hierarchical ternary aerogel of TiO2 [email protected] carbon nanofibers-reduced graphene oxide (TiO2@PCNF-GA) was designed as an advanced anode for lithium-ion capacitors. TiO2@PCNFs were first fabricated by electrospinning assisted by carbonization and a post-etching process, and then assembled into reduced graphene oxide aerogels (GAs) to obtain the TiO2@PCNF-GAs. The uniform distribution of the ultrafine TiO2 nanoparticles in the PCNFs inhibits the aggregation of the TiO2 nanoparticles. Meanwhile, the interconnected three-dimensional network constructed from the TiO2@PCNFs and the GAs inhibits the aggregation of the TiO2@PCNFs. Moreover, the hierarchical porous structure of the TiO2@PCNF-GAs affords numerous Li-ion transport paths. Therefore, the lithium-ion capacitor composed of the TiO2@PCNF-GAs anode and an activated carbon cathode exhibits high energy density versus power density (79.7 Wh kg−1 versus 75 W kg−1, 15.0 Wh kg−1 versus 15 kW kg−1) with superior cycle stability (93.3% retention after 10000 cycles at 5.0 A g−1).



中文翻译:

超细TiO 2 [电子邮件保护]碳纳米纤维还原的氧化石墨烯的三维分层三元气凝胶,用于高性能锂离子电容器

设计了一种新型的TiO 2 [电子邮件保护的]碳纳米纤维还原的氧化石墨烯(TiO 2 @ PCNF-GA)三维立体三元气凝胶作为锂离子电容器的高级阳极。TiO 2 @PCNFs首先通过电纺丝在碳化和后蚀刻工艺的辅助下制备,然后组装成还原的氧化石墨烯气凝胶(GAs),以获得TiO 2 @ PCNF-GAs。超细TiO 2纳米颗粒在PCNFs中的均匀分布抑制了TiO 2纳米颗粒的聚集。同时,由TiO 2 @PCNFs和GAs构成的互连三维网络抑制了TiO 2的聚集。2个@PCNF。此外,TiO 2 @ PCNF-GAs的分层多孔结构提供了许多锂离子传输路径。因此,在TiO构成的锂离子电容器2 @ PCNF气体阳极和活性炭阴极表现出高的能量密度对功率密度(79.7瓦千克-1与75瓦千克-1,15.0瓦千克-1与15千瓦kg -1)具有出色的循环稳定性(在5.0 A g -1的条件下进行10000次循环后,保持力为93.3%)。

更新日期:2018-10-09
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