TY - JOUR
T1 - Novel Deep-Eutectic-Solvent-Infused Carbon Nanofiber Networks as High Power Density Green Battery Cathodes
AU - Kawase, Koki
AU - Abe, Jyunichiro
AU - Tenjimbayashi, Mizuki
AU - Kobayashi, Yuta
AU - Takahashi, Keisuke
AU - Shiratori, Seimei
N1 - Funding Information:
*E-mail: shiratori@appi.keio.ac.jp. ORCID Seimei Shiratori: 0000-0001-9807-3555 Author Contributions K.K. and J.A. designed the experiment. K.K. collected the data. K.K. and M. T. conducted the wettability analysis. K.K., J.A., Y.K., and K.T. discussed the battery performance data. J.A. and M. T. provided scientific advice. K.K., J.A., and M.T. wrote the paper. S. S. supervised the project, provided scientific advice, and commented on the manuscript. Funding This work was supported by Keio Leading-Edge Laboratory of Science and Technology (KLL) awarded to J.A., and JSPS KAKENHI (grant number JP 16J06070), awarded to M.T. Notes The authors declare no competing financial interest.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/5/9
Y1 - 2018/5/9
N2 - Redox flow batteries (RFBs) have emerged as a promising candidate for large-scale energy storage because of the flexible design for high energy, power, and safety. In this study, FeCl3·6H2O/urea composite deep eutectic catholyte (FeU-DEC)-infused self-standing carbon nanofiber (CNF) was synthesized for green and high power density RFB through industrially available processes. FeU-DEC-infused CNF displayed an extremely high power density (874 mW/g) as well as high capacity (27.28 mAh/g) derived from high theoretical capacity of FeU-DEC (89.24 mAh/g) in addition to the advantages of the FeU-DEC characteristics (e.g., nonflammable, biodegradable, facile preparation). This is because of the large electroactive area derived from the high surface area of CNF and superlyophilicity of FeU-DEC on CNFs. Furthermore, we compared the wettability of CNF with other electrodes, as well as the chemical stability and electrode performance, based on topological wetting analysis using parameters of fiber radius, fiber interval, the equilibrium contact angle of FeU-DEC on electrodes, and surface tension of FeU-DEC, giving wetting threshold for FeU-DEC on fibrous electrodes. The wetting analysis are applied not only for FeU-DEC, but also for a wide range of other DECs and deep eutectic anolyte. This work contributes to the further development of green and high-performance RFBs.
AB - Redox flow batteries (RFBs) have emerged as a promising candidate for large-scale energy storage because of the flexible design for high energy, power, and safety. In this study, FeCl3·6H2O/urea composite deep eutectic catholyte (FeU-DEC)-infused self-standing carbon nanofiber (CNF) was synthesized for green and high power density RFB through industrially available processes. FeU-DEC-infused CNF displayed an extremely high power density (874 mW/g) as well as high capacity (27.28 mAh/g) derived from high theoretical capacity of FeU-DEC (89.24 mAh/g) in addition to the advantages of the FeU-DEC characteristics (e.g., nonflammable, biodegradable, facile preparation). This is because of the large electroactive area derived from the high surface area of CNF and superlyophilicity of FeU-DEC on CNFs. Furthermore, we compared the wettability of CNF with other electrodes, as well as the chemical stability and electrode performance, based on topological wetting analysis using parameters of fiber radius, fiber interval, the equilibrium contact angle of FeU-DEC on electrodes, and surface tension of FeU-DEC, giving wetting threshold for FeU-DEC on fibrous electrodes. The wetting analysis are applied not only for FeU-DEC, but also for a wide range of other DECs and deep eutectic anolyte. This work contributes to the further development of green and high-performance RFBs.
KW - carbon nanofiber
KW - deep eutectic solvent
KW - electrospinning
KW - redox flow battery
KW - wettability
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U2 - 10.1021/acsami.8b03099
DO - 10.1021/acsami.8b03099
M3 - Article
C2 - 29687990
AN - SCOPUS:85046408285
SN - 1944-8244
VL - 10
SP - 15742
EP - 15750
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 18
ER -