title: Hierarchical porous carbon microspheres derived from porous starch for use in high-rate electrochemical double-layer capacitors.
abstract: Porous starch was used as a precursor for hierarchical porous carbon microspheres. The preparation consisted of stabilisation, carbonisation and KOH activation, and the resultant hierarchical porous carbon microspheres had a large BET surface area of 3251 m(2)g(-1). Due to the large surface area and the hierarchical pore structure, electrodes made of the hierarchical porous carbon microsphere materials had high specific capacitances of 304 Fg(-1) at a current density of 0.05 Ag(-1) and 197 Fg(-1) at a current density of 180 Ag(-1) when used in a symmetric capacitor with 6M KOH as the electrolyte. After 10,000 cycles, the capacitor still exhibited a stable performance with a capacitance retention of 98%. These results indicate that porous starch is an excellent precursor to prepare high performance electrode materials for EDLCs.
authors.affiliation: Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, PR China.
authors.forename: Si-Hong
authors.initials: SH
authors.lastname: Du
authors.forename: Li-Qun
authors.initials: LQ
authors.lastname: Wang
authors.forename: Xiao-Ting
authors.initials: XT
authors.lastname: Fu
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Chen
authors.forename: Cheng-Yang
authors.initials: CY
authors.lastname: Wang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D025802:Electric Capacitance; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D008863:Microspheres; D016062:Porosity; D013213:Starch / Q000737:chemistry*
chemical_list: D002244:Carbon; D013213:Starch