TY - JOUR
T1 - Nanostructured Nickel/Ruthenium/Ruthenium-Oxide Supercapacitor Displaying Exceptional High Frequency Response
AU - Morag, Ahiud
AU - Maman, Nitzan
AU - Froumin, Natalya
AU - Ezersky, Vladimir
AU - Rechav, Katya
AU - Jelinek, Raz
N1 - Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/1/1
Y1 - 2020/1/1
N2 - The lower performance of pseudocapacitive supercapacitors in high-frequency applications such as alternating current (AC) line filtering has been ascribed to presumed slow kinetics of redox processes compared to ion diffusion in electric double layer capacitors. A nickel-deposited ruthenium/ruthenium-oxide symmetric supercapacitor exhibiting remarkable electrochemical properties, particularly very high frequency response (>1 kHz) is developed. The electrodes are prepared via a simple process consisting of electrochemical reduction of ruthenium chloride on commercially available nickel foil as the current collector. A symmetric supercapacitor comprising nickel/ruthenium/ruthenium-oxide electrodes and a polystyrene-based thin spacer exhibits particularly fast scan rates, high power density of 1500 mW cm−2 (88 kW cm−3) with a maximum energy density of 0.58 µWh cm−2 (34 mWh cm−3), and excellent capacitance retention. Notably, supercapacitors prepared by the same synthetic method albeit using conventional gold substrate instead of nickel exhibit significantly lower frequency response. The exceptional electrochemical properties of the nickel/ruthenium/ruthenium-oxide supercapacitor and simple electrode synthesis point to promising applicability in AC line filtering and power conditioning. In a broader context, this work demonstrates that, contrary to the widely held presumption, the kinetics of redox reactions at the active layers of pseudocapacitors may not be the primary barriers to high-frequency applications.
AB - The lower performance of pseudocapacitive supercapacitors in high-frequency applications such as alternating current (AC) line filtering has been ascribed to presumed slow kinetics of redox processes compared to ion diffusion in electric double layer capacitors. A nickel-deposited ruthenium/ruthenium-oxide symmetric supercapacitor exhibiting remarkable electrochemical properties, particularly very high frequency response (>1 kHz) is developed. The electrodes are prepared via a simple process consisting of electrochemical reduction of ruthenium chloride on commercially available nickel foil as the current collector. A symmetric supercapacitor comprising nickel/ruthenium/ruthenium-oxide electrodes and a polystyrene-based thin spacer exhibits particularly fast scan rates, high power density of 1500 mW cm−2 (88 kW cm−3) with a maximum energy density of 0.58 µWh cm−2 (34 mWh cm−3), and excellent capacitance retention. Notably, supercapacitors prepared by the same synthetic method albeit using conventional gold substrate instead of nickel exhibit significantly lower frequency response. The exceptional electrochemical properties of the nickel/ruthenium/ruthenium-oxide supercapacitor and simple electrode synthesis point to promising applicability in AC line filtering and power conditioning. In a broader context, this work demonstrates that, contrary to the widely held presumption, the kinetics of redox reactions at the active layers of pseudocapacitors may not be the primary barriers to high-frequency applications.
KW - AC line filters
KW - electrochemical deposition
KW - high frequency response
KW - pseudocapacitors
KW - ruthenium oxide
KW - ultrahigh power density
UR - http://www.scopus.com/inward/record.url?scp=85075459240&partnerID=8YFLogxK
U2 - 10.1002/aelm.201900844
DO - 10.1002/aelm.201900844
M3 - Article
AN - SCOPUS:85075459240
SN - 2199-160X
VL - 6
JO - Advanced Electronic Materials
JF - Advanced Electronic Materials
IS - 1
M1 - 1900844
ER -