Journal
ADVANCED SCIENCE
Volume 6, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900107
Keywords
bubble nanofibers; bubble nanosheets; Co3O4 supraparticles; supercapacitors
Categories
Funding
- National Science Fund for Distinguished Young Scholars [51425304]
- NSFC-DFG Joint Research Project [51761135114]
- National Natural Science Foundation of China [21704038, 51763018]
- Natural Science Foundation of Jiangxi Province [20171ACB21009, 2018ACB21021]
- China Postdoctoral Science Foundation [2018M632599]
- National Postdoctoral Program for Innovative Talents [BX201700112]
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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 Co3O4 hollow supraparticle (HSP) composites (denoted as CNF/HSP-Co3O4 and RGO/HSP-Co3O4, respectively) by solution self-assembly of ultrasmall Co3O4 nanoparticles (NPs) assisting with polydopamine (PDA) modification. It is proved that the electrochemical performance of Co3O4 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.
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