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Electric charging/discharging characteristics of super capacitor, using de-alloying and anodic oxidized Ti-Ni-Si amorphous alloy ribbons.

Fukuhara M, Sugawara K - Nanoscale Res Lett (2014)

Bottom Line: Charging/discharging behaviors of de-alloyed and anodic oxidized Ti-Ni-Si amorphous alloy ribbons were measured as a function of current between 10 pA and 100 mA, using galvanostatic charge/discharging method.In sharp contrast to conventional electric double layer capacitor (EDLC), discharging behaviors for voltage under constant currents of 1, 10 and 100 mA after 1.8 ks charging at 100 mA show parabolic decrease, demonstrating direct electric storage without solvents.The supercapacitors, devices that store electric charge on their amorphous TiO2-x surfaces that contain many 70-nm sized cavities, show the Ragone plot which locates at lower energy density region near the 2nd cells, and RC constant of 800 s (at 1 mHz), which is 157,000 times larger than that (5 ms) in EDLC.

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Affiliation: New Industry Creation Hatchery Center, Tohoku University, 3-4-1, Sakuragi, Tagajyo, Miyagi 985-8589, Japan ; Fracture and Reliability Research Institute, Tohoku University, Sendai 980-8579, Japan ; Green Device Laboratory, Institute for Nanoscience & Nanotechnology, Waseda University, Shinjuku, Tokyo 162-0041, Japan.

ABSTRACT
Charging/discharging behaviors of de-alloyed and anodic oxidized Ti-Ni-Si amorphous alloy ribbons were measured as a function of current between 10 pA and 100 mA, using galvanostatic charge/discharging method. In sharp contrast to conventional electric double layer capacitor (EDLC), discharging behaviors for voltage under constant currents of 1, 10 and 100 mA after 1.8 ks charging at 100 mA show parabolic decrease, demonstrating direct electric storage without solvents. The supercapacitors, devices that store electric charge on their amorphous TiO2-x surfaces that contain many 70-nm sized cavities, show the Ragone plot which locates at lower energy density region near the 2nd cells, and RC constant of 800 s (at 1 mHz), which is 157,000 times larger than that (5 ms) in EDLC.

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DSC trace and X-ray diffraction patterns. DSC trace of the studied amorphous Ti-Ni-Si alloy scanned at 0.67 K/s (a) and X-ray diffraction patterns of the studied alloy before and after de-alloying and then anodic oxidation (b).
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Figure 1: DSC trace and X-ray diffraction patterns. DSC trace of the studied amorphous Ti-Ni-Si alloy scanned at 0.67 K/s (a) and X-ray diffraction patterns of the studied alloy before and after de-alloying and then anodic oxidation (b).

Mentions: The DSC trace of the studied Ti-15 at% Ni-15 at% Si alloy ribbons shown in Figure 1a exhibits an increment in Cp at the glass transition temperature (Tg) of 555 K and one clear exothermal peak with peak temperature of 836 K. Referring to the DSC trace (Figure 1a), Figure 1b shows X-ray patterns of the specimen before and after de-alloying and anodic oxidization. It is known that amorphous titanium oxide exists in nonstoichiometric form, TiO2-x which has a complicated defect structure [14].


Electric charging/discharging characteristics of super capacitor, using de-alloying and anodic oxidized Ti-Ni-Si amorphous alloy ribbons.

Fukuhara M, Sugawara K - Nanoscale Res Lett (2014)

DSC trace and X-ray diffraction patterns. DSC trace of the studied amorphous Ti-Ni-Si alloy scanned at 0.67 K/s (a) and X-ray diffraction patterns of the studied alloy before and after de-alloying and then anodic oxidation (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4061119&req=5

Figure 1: DSC trace and X-ray diffraction patterns. DSC trace of the studied amorphous Ti-Ni-Si alloy scanned at 0.67 K/s (a) and X-ray diffraction patterns of the studied alloy before and after de-alloying and then anodic oxidation (b).
Mentions: The DSC trace of the studied Ti-15 at% Ni-15 at% Si alloy ribbons shown in Figure 1a exhibits an increment in Cp at the glass transition temperature (Tg) of 555 K and one clear exothermal peak with peak temperature of 836 K. Referring to the DSC trace (Figure 1a), Figure 1b shows X-ray patterns of the specimen before and after de-alloying and anodic oxidization. It is known that amorphous titanium oxide exists in nonstoichiometric form, TiO2-x which has a complicated defect structure [14].

Bottom Line: Charging/discharging behaviors of de-alloyed and anodic oxidized Ti-Ni-Si amorphous alloy ribbons were measured as a function of current between 10 pA and 100 mA, using galvanostatic charge/discharging method.In sharp contrast to conventional electric double layer capacitor (EDLC), discharging behaviors for voltage under constant currents of 1, 10 and 100 mA after 1.8 ks charging at 100 mA show parabolic decrease, demonstrating direct electric storage without solvents.The supercapacitors, devices that store electric charge on their amorphous TiO2-x surfaces that contain many 70-nm sized cavities, show the Ragone plot which locates at lower energy density region near the 2nd cells, and RC constant of 800 s (at 1 mHz), which is 157,000 times larger than that (5 ms) in EDLC.

View Article: PubMed Central - HTML - PubMed

Affiliation: New Industry Creation Hatchery Center, Tohoku University, 3-4-1, Sakuragi, Tagajyo, Miyagi 985-8589, Japan ; Fracture and Reliability Research Institute, Tohoku University, Sendai 980-8579, Japan ; Green Device Laboratory, Institute for Nanoscience & Nanotechnology, Waseda University, Shinjuku, Tokyo 162-0041, Japan.

ABSTRACT
Charging/discharging behaviors of de-alloyed and anodic oxidized Ti-Ni-Si amorphous alloy ribbons were measured as a function of current between 10 pA and 100 mA, using galvanostatic charge/discharging method. In sharp contrast to conventional electric double layer capacitor (EDLC), discharging behaviors for voltage under constant currents of 1, 10 and 100 mA after 1.8 ks charging at 100 mA show parabolic decrease, demonstrating direct electric storage without solvents. The supercapacitors, devices that store electric charge on their amorphous TiO2-x surfaces that contain many 70-nm sized cavities, show the Ragone plot which locates at lower energy density region near the 2nd cells, and RC constant of 800 s (at 1 mHz), which is 157,000 times larger than that (5 ms) in EDLC.

No MeSH data available.


Related in: MedlinePlus