title: Nickel Nanofoam/Different Phases of Ordered Mesoporous Carbon Composite Electrodes for Superior Capacitive Energy Storage.
abstract: Electrochemical energy storage devices based on electric double layer capacitors (EDLCs) have received considerable attention due to their high power density and potential for obtaining improved energy density in comparison to the lithium ion battery. Ordered mesoporous carbon (OMC) is a promising candidate for use as an EDLC electrode because it has a high specific surface area (SSA), providing a wider charge storage space and size-controllable mesopore structure with a long-range order, suppling high accessibility to the electrolyte ions. However, OMCs fabricated using conventional methods have several drawbacks including low electronic conductivity and long ionic diffusion paths in mesopores. We used nickel nanofoam, which has a relatively small pore (sub-100 nm to subμm) network structure, as a current collector. This provides a significantly shortened electronic/ionic current paths and plentiful surface area, enabling stable and close attachment of OMCs without the use of binders. Thus, we present hierarchical binder-free electrode structures based on OMC/Ni nanofoams. These structures give rise to enhanced specific capacitance and a superior rate capability. We also investigated the mesopore structural effect of OMCs on electrolyte transport by comparing the capacitive performances of collapsed lamellar, cylindrical, and spherical mesopore electrodes. The highly ordered and straightly aligned cylindrical OMCs exhibited the highest specific capacitance and the best rate capability.
authors.affiliation: Photo-Electronic Hybrid Research Center, Korea Institute of Science and Technology , Seoul 136-791, Republic of Korea.|School of Chemical and Biological Engineering, The National Creative Research Initiative Center for Intelligent Hybrids, Seoul National University , Seoul 151-744, Republic of Korea.
authors.forename: Kangsuk
authors.initials: K
authors.lastname: Lee
authors.affiliation: School of Chemical and Biological Engineering, The National Creative Research Initiative Center for Intelligent Hybrids, Seoul National University , Seoul 151-744, Republic of Korea.
authors.forename: Haeni
authors.initials: H
authors.lastname: Song
authors.affiliation: Photo-Electronic Hybrid Research Center, Korea Institute of Science and Technology , Seoul 136-791, Republic of Korea.
authors.forename: Kwang Hoon
authors.initials: KH
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Hongik University , Seoul 121-791, Republic of Korea.
authors.forename: Soo Hyung
authors.initials: SH
authors.lastname: Choi
authors.affiliation: Fuel Cell Research Center, Korea Institute of Science and Technology , Seoul 136-791, Republic of Korea.
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Jang
authors.affiliation: School of Chemical and Biological Engineering, The National Creative Research Initiative Center for Intelligent Hybrids, Seoul National University , Seoul 151-744, Republic of Korea.
authors.forename: Kookheon
authors.initials: K
authors.lastname: Char
authors.affiliation: Photo-Electronic Hybrid Research Center, Korea Institute of Science and Technology , Seoul 136-791, Republic of Korea.
authors.forename: Jeong Gon
authors.initials: JG
authors.lastname: Son
keywords: block copolymer self-assembly; electric double-layer capacitance; nickel nanofoam; ordered mesoporous carbon; supercapacitor