Open AccessCo 3 O 4 Supraparticle‐Based Bubble Nanofiber and Bubble Nanosheet with Remarkable Electrochemical Performance
Author(s) -
Huang Jun,
Xiao Yingbo,
Peng Zhongyou,
Xu Yazhou,
Li Longbin,
Tan Licheng,
Yuan Kai,
Chen Yiwang
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900107
Subject(s) - materials science , supercapacitor , nanosheet , nanotechnology , electrode , carbon nanofiber , graphene , bubble , nanofiber , nanostructure , electrochemistry , oxide , capacitance , fabrication , chemical engineering , carbon nanotube , computer science , chemistry , metallurgy , medicine , alternative medicine , pathology , parallel computing , engineering
Hollow nanostructures based on transition metal oxides (TMOs) with high surface‐to‐volumetric ratio, low density, and high loading capacity have received great attention for energy‐related applications. However, the controllable fabrication of hybrid TMO‐based hollow nanostructures in a simple and scalable manner remains challenging. Herein, a simple and scalable strategy is used to prepare hierarchical carbon nanofiber (CNF)‐based bubble‐nanofiber‐structured and reduced graphene oxide (RGO)‐based bubble‐nanosheet‐structured Co 3 O 4 hollow supraparticle (HSP) composites (denoted as CNF/HSP‐Co 3 O 4 and RGO/HSP‐Co 3 O 4 , respectively) by solution self‐assembly of ultrasmall Co 3 O 4 nanoparticles (NPs) assisting with polydopamine (PDA) modification. It is proved that the electrochemical performance of Co 3 O 4 NPs can be greatly enhanced by the rationally designed nanostructure of bubble‐like supraparticles combined with carbon materials as excellent electrodes for supercapacitors. The favorable structure and composition endow the hybrid electrode with high specific capacitance (1435 F g −1 /1360 F g −1 at 1 A g −1 /5 mV s −1 ) as well as fantastic rate capability. The asymmetric supercapacitors achieve an excellent maximum energy density of 51 W h kg −1 and superb electrochemical stability (92.3% retention after 10 000 cycles). This work suggests that the rational design of electrode materials with bubble‐like superstructures provides an opportunity for achieving high‐performance electrode materials for advanced energy storage devices.