Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying

Joung Wook Kim; Takeshi Wada; Sung Gyoo Kim; Hidemi Kato

doi:10.1016/j.scriptamat.2016.05.014

Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying

Joung Wook Kim, Takeshi Wada, Sung Gyoo Kim, Hidemi Kato

Materials Development Division

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

To increase the surface area while decreasing the ligament size of an Nb anode pellet for use as a capacitor, we added Ce to an Mg melt; the dealloying reaction occurred at temperatures lower than 1023 K, the previously lowest recorded temperature for such a reaction. By analyzing the dealloying kinetics, we found the optimum dealloying conditions to produce a minimum ligament size of 100 nm in the Mg_95.7Ce_4.3 melt: 923 K for 420 s. Using these conditions, we increased the specific surface area of the Nb anode pellet to 4.3 m²/g, which increased its mass-specific capacitance to 875,000 μFV/g.

Original language	English
Pages (from-to)	68-71
Number of pages	4
Journal	Scripta Materialia
Volume	122
DOIs	https://doi.org/10.1016/j.scriptamat.2016.05.014
Publication status	Published - 2016 Sept 1

Keywords

Dealloying
Electrical properties
Kinetics
Nanostructure
Porous material

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2016.05.014

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title = "Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying",

abstract = "To increase the surface area while decreasing the ligament size of an Nb anode pellet for use as a capacitor, we added Ce to an Mg melt; the dealloying reaction occurred at temperatures lower than 1023 K, the previously lowest recorded temperature for such a reaction. By analyzing the dealloying kinetics, we found the optimum dealloying conditions to produce a minimum ligament size of 100 nm in the Mg95.7Ce4.3 melt: 923 K for 420 s. Using these conditions, we increased the specific surface area of the Nb anode pellet to 4.3 m2/g, which increased its mass-specific capacitance to 875,000 μFV/g.",

keywords = "Dealloying, Electrical properties, Kinetics, Nanostructure, Porous material",

author = "Kim, {Joung Wook} and Takeshi Wada and Kim, {Sung Gyoo} and Hidemi Kato",

note = "Funding Information: This work was partially supported by JSPS KAKENHI Grant Number 25246009 and the Integrated Materials Research Center for a Low-Carbon Society (LC-IMR) , which has been reorganized as the Collaborative Research Center on Energy Materials (E-IMR), IMR , Tohoku University . ",

year = "2016",

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doi = "10.1016/j.scriptamat.2016.05.014",

language = "English",

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pages = "68--71",

journal = "Scripta Materialia",

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T1 - Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying

AU - Kim, Joung Wook

AU - Wada, Takeshi

AU - Kim, Sung Gyoo

AU - Kato, Hidemi

N1 - Funding Information: This work was partially supported by JSPS KAKENHI Grant Number 25246009 and the Integrated Materials Research Center for a Low-Carbon Society (LC-IMR) , which has been reorganized as the Collaborative Research Center on Energy Materials (E-IMR), IMR , Tohoku University .

PY - 2016/9/1

Y1 - 2016/9/1

N2 - To increase the surface area while decreasing the ligament size of an Nb anode pellet for use as a capacitor, we added Ce to an Mg melt; the dealloying reaction occurred at temperatures lower than 1023 K, the previously lowest recorded temperature for such a reaction. By analyzing the dealloying kinetics, we found the optimum dealloying conditions to produce a minimum ligament size of 100 nm in the Mg95.7Ce4.3 melt: 923 K for 420 s. Using these conditions, we increased the specific surface area of the Nb anode pellet to 4.3 m2/g, which increased its mass-specific capacitance to 875,000 μFV/g.

AB - To increase the surface area while decreasing the ligament size of an Nb anode pellet for use as a capacitor, we added Ce to an Mg melt; the dealloying reaction occurred at temperatures lower than 1023 K, the previously lowest recorded temperature for such a reaction. By analyzing the dealloying kinetics, we found the optimum dealloying conditions to produce a minimum ligament size of 100 nm in the Mg95.7Ce4.3 melt: 923 K for 420 s. Using these conditions, we increased the specific surface area of the Nb anode pellet to 4.3 m2/g, which increased its mass-specific capacitance to 875,000 μFV/g.

KW - Dealloying

KW - Electrical properties

KW - Kinetics

KW - Nanostructure

KW - Porous material

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DO - 10.1016/j.scriptamat.2016.05.014

M3 - Article

AN - SCOPUS:84971344224

SN - 1359-6462

VL - 122

SP - 68

EP - 71

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying

Abstract

Keywords

ASJC Scopus subject areas

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