Electromechanical polymer actuators using nano-sized carbon

CARBON

4 8 ( 2 0 1 0 ) 1 3 2 2 –1 3 2 4

1323

Influence of heating duration on high-voltage charging durability

Cext./Cmicro. are in the range 2.4–2.8 in H2SO4, but 4.3–7.2 in TEMA-

of an activated carbon electrode for electric double layer

BF4/PC. Cmicro. in TEMABF4/PC is smaller than that in H2SO4, sug-

capacitors

gesting a smaller contribution of micropores to capacitance in

Soshi Shiraishi, Kaoru Sunaga, Takaaki Suganuma

TEMABF4/PC.

Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan

TANSO 2009(240)230–8. doi:10.1016/j.carbon.2009.11.006

Phenolic-resin based steam-activated carbon fiber (ACF) for electric double layer capacitors was subjected to heat-treatment

Electromechanical polymer actuators using nano-sized carbon

at 1500 °C in nitrogen. The dependence of the pore structure

Satoshi Mitani, Kinji Asaka

and the capacitance retention rate after high voltage charging (3 V, 100 h, 70 °C) on the heating duration was investigated using a two-electrode cell with propylene carbonate electrolyte. The micropore-shrinkage and the removal of the oxygen-containing surface functionalities of the ACF were accomplished within a short time (5 s) by the heat-treatment, however, a longer time (1 h) was necessary to improve the capacitance retention rate. The Raman analysis revealed that the local ordering structure changed slowly by heat-treatment at 1500 °C, suggesting the sufficiently long heat-treatment essential to the improvement of the capacitance retention rate.

to electric double layer capacitance b

c

Lihong Wang , Michio Inagaki , Masahiro Toyoda

Central R&D, Daido Metal Co. Ltd., Maehara, Inuyama 484-0061,

Japan

nanotubes, and explains configurations of the actuator and the drive principle. The authors studied the effect of various ionic liquids and adding an activated carbon nanofiber. It was found that the performance of the actuator depend on the properties of the

Proton conductivity of fullerene derivatives and their composites Hiroshi Shioyama National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan

Professor Emeritus, 718-1701 Takayanagi-cho, Meitou-ku, Nagoya

465-0034, Japan c

review introduces electro-active polymer actuators using carbon

doi:10.1016/j.carbon.2009.11.007

Contributions of micropores and mesopores in electrode carbon

b

Electro-active polymer actuators are expected to have use in medical devices, prosthetic devices, the field of robotics, etc. This

TANSO 2009(240)239–44.

doi:10.1016/j.carbon.2009.11.005

a

(AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan

ionic liquids and the carbon structure.

TANSO 2009(240)226–9.

a

National Institute of Advanced Industrial Science and Technology

Faculty of Engineering, Oita University, 700 Dannnoharu,

Oita 870-1192, Japan

Fullerene derivatives such as polyhydroxyfullerene C60 (OH)n (n  12) show proton conductivity. This review introduces the properties of proton conducting fullerenes and their composite membranes with Nafion. These proton conductors have advanta-

Performance of electric double layer capacitors (EDLCs) was studied by using different microporous and mesoporous carbons in positive and negative electrodes (symmetric and asymmetric EDLCs) in non-aqueous and aqueous electrolytes (1M TEMABF4/ PC and 1M H2SO4, respectively). Microporous carbons were selected from commercially available activated carbons and mes-

ges under low humidity conditions. Their applications for the proton conducting membrane of a polymer electrolyte fuel cell (PEFC) and mass-flow controller are also discussed. TANSO 2009(240)245–9. doi:10.1016/j.carbon.2009.11.008

oporous carbons from laboratory-made ones. Asymmetric EDLCs consisting of microporous carbon AC-5 and different mesoporous carbons XX in either the positive or negative electrode (AC-5/XX

Basic characterization of lithium ion capacitor

and XX/AC-5) showed a predominant contribution of the negative

Soshi Shiraishi

electrode, where cations of electrolyte are adsorbed, to capacitance and rate performance. Contributions of the surface due to micropores and that due to other large pores to the EDLC capacitance were separately evaluated as a function of current density

Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan

for the charge/discharge cycle in two electrolytes. The contribution of microporous surface, Cmicro., is smaller than that of the

The author addresses the fabrication method and the Ragon

surface of other large pores, Cext., depending more markedly on

plot measurement of lithium ion capacitor for basic characteriza-

current density during the charge/discharge cycle. The values of

tion. The preparation of activated carbon electrode as positive