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Indexed by:期刊论文

Date of Publication:2015-03-01

Journal:ENERGY TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:3

Issue:3

Page Number:234-241

ISSN No.:2194-4288

Key Words:binder-free electrodes; carbonization; mesoporous carbon; nickel; supercapacitors

Abstract:A three-dimensional mesoporous carbon/nickel foam hybrid material has been prepared using an insitu solution growth approach, and its energy storage as a binder-free supercapacitor electrode is explored. The nickel foam is chosen as an electrically conducting scaffold and also as a porous substrate for the growth of poly(benzoxazine-co-resol). After carbonization, tightly packed carbon layers are uniformly coated on the skeleton of the nickel foam. Such carbons show hierarchical porosity (micro-, meso-, macroporosity), a high surface area of 811m(2)g(-1), and graphitic domains. These features allow easy access, rapid diffusion, and a high loading of ions, producing a material in which ion diffusion is faster than in bulk carbon and which is highly efficient in producing an increased double-layer capacitance. The obtained electrodes exhibit an excellent capacitive behavior in KOH solutions, that is, low contact resistance, high specific capacitance (192Fg(-1)), and good rate performance. Furthermore, the three-dimensional porous substrates facilitate a high mass loading of active materials, up to 21mgcm(-2), and per-area capacitance of 1.18Fcm(-2). This synthesis strategy is scalable and potentially usable for large-scale production.