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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.

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

AFM image (a) and corresponding SKPM image (b) for surface of de-alloyed and then anodic oxidized Ti-Ni-Si specimen. Lower profiles of (a) and (b) are height from valley bottom and electrostatic potential for probe with 0 eV along red lines in upper images, respectively.
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Figure 2: AFM image (a) and corresponding SKPM image (b) for surface of de-alloyed and then anodic oxidized Ti-Ni-Si specimen. Lower profiles of (a) and (b) are height from valley bottom and electrostatic potential for probe with 0 eV along red lines in upper images, respectively.

Mentions: Figure 2a and b show the atomic force microscope (AFM) images and the corresponding scanning Kelvin probe force microscope (SKPM) images for oxidized speccimens, respectively. The image in Figure 2a shows that a large numbers of volcanic craters with round pores approximately 70 nm in diameter were formed on the titanium oxide surface [15,16]. The profile line length of Figure 2a shows 2.5 times longer than smooth one defore anodic oxidation, indicating increment of the surface area by around 6 times. From the line profiles of the noncontact AFM (NC-AFM), spots ca. 7 nm in size with higher work functions Φ, of 5.53 eV (=5.65 (ΦPt)–0.12 (ΦCPD)) are located in volcanic craters and at the bottom of ravines. The concave contact potential difference ΦCPD, indicates storage of electric charges [17].


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)

AFM image (a) and corresponding SKPM image (b) for surface of de-alloyed and then anodic oxidized Ti-Ni-Si specimen. Lower profiles of (a) and (b) are height from valley bottom and electrostatic potential for probe with 0 eV along red lines in upper images, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: AFM image (a) and corresponding SKPM image (b) for surface of de-alloyed and then anodic oxidized Ti-Ni-Si specimen. Lower profiles of (a) and (b) are height from valley bottom and electrostatic potential for probe with 0 eV along red lines in upper images, respectively.
Mentions: Figure 2a and b show the atomic force microscope (AFM) images and the corresponding scanning Kelvin probe force microscope (SKPM) images for oxidized speccimens, respectively. The image in Figure 2a shows that a large numbers of volcanic craters with round pores approximately 70 nm in diameter were formed on the titanium oxide surface [15,16]. The profile line length of Figure 2a shows 2.5 times longer than smooth one defore anodic oxidation, indicating increment of the surface area by around 6 times. From the line profiles of the noncontact AFM (NC-AFM), spots ca. 7 nm in size with higher work functions Φ, of 5.53 eV (=5.65 (ΦPt)–0.12 (ΦCPD)) are located in volcanic craters and at the bottom of ravines. The concave contact potential difference ΦCPD, indicates storage of electric charges [17].

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