Activity gradient carbon felt electrodes for vanadium redox flow batteries

Youngkwon Kim, Yun Young Choi, Nari Yun, Mingyu Yang, Yonghee Jeon, Ki Jae Kim, Jung Il Choi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

An activity gradient carbon felt (AGCF) electrode is prepared by a simple thermal oxidation method, which is composed of both a low activity electrode near the inlet side and a high activity electrode near the outlet side. The vanadium redox flow battery (VRFB) full cell with AGCF electrodes shows higher discharge capacity (18.7 Ah L−1) and coulomb efficiency (93.6%) than non-gradient carbon felt electrodes (14.3 Ah L−1, 88.4%) at a current density of 80 mA cm−2. From the computational analysis, the AGCF electrodes exhibit reduced overpotential results as well as improved uniform activity at low reactant concentration condition during charging and discharging at the current density. These results suggest that the AGCF electrode is an effective electrode design for high-performance VRFB featuring high energy density by improving electrolyte utilization as well as high roundtrip efficiency by improving energy efficiency.

Original languageEnglish
Pages (from-to)128-135
Number of pages8
JournalJournal of Power Sources
DOIs
Publication statusPublished - 2018 Dec 31

Fingerprint

Vanadium
vanadium
electric batteries
gradients
Electrodes
Carbon
electrodes
carbon
side inlets
Current density
current density
Flow batteries
carbon fiber
outlets
Electrolytes
charging
Energy efficiency
low concentrations
flux density
electrolytes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

Kim, Youngkwon ; Choi, Yun Young ; Yun, Nari ; Yang, Mingyu ; Jeon, Yonghee ; Kim, Ki Jae ; Choi, Jung Il. / Activity gradient carbon felt electrodes for vanadium redox flow batteries. In: Journal of Power Sources. 2018 ; pp. 128-135.
@article{5c0bd43d7d364537bcc6bc64e31980ee,
title = "Activity gradient carbon felt electrodes for vanadium redox flow batteries",
abstract = "An activity gradient carbon felt (AGCF) electrode is prepared by a simple thermal oxidation method, which is composed of both a low activity electrode near the inlet side and a high activity electrode near the outlet side. The vanadium redox flow battery (VRFB) full cell with AGCF electrodes shows higher discharge capacity (18.7 Ah L−1) and coulomb efficiency (93.6{\%}) than non-gradient carbon felt electrodes (14.3 Ah L−1, 88.4{\%}) at a current density of 80 mA cm−2. From the computational analysis, the AGCF electrodes exhibit reduced overpotential results as well as improved uniform activity at low reactant concentration condition during charging and discharging at the current density. These results suggest that the AGCF electrode is an effective electrode design for high-performance VRFB featuring high energy density by improving electrolyte utilization as well as high roundtrip efficiency by improving energy efficiency.",
author = "Youngkwon Kim and Choi, {Yun Young} and Nari Yun and Mingyu Yang and Yonghee Jeon and Kim, {Ki Jae} and Choi, {Jung Il}",
year = "2018",
month = "12",
day = "31",
doi = "10.1016/j.jpowsour.2018.09.066",
language = "English",
pages = "128--135",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier",

}

Activity gradient carbon felt electrodes for vanadium redox flow batteries. / Kim, Youngkwon; Choi, Yun Young; Yun, Nari; Yang, Mingyu; Jeon, Yonghee; Kim, Ki Jae; Choi, Jung Il.

In: Journal of Power Sources, 31.12.2018, p. 128-135.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Activity gradient carbon felt electrodes for vanadium redox flow batteries

AU - Kim, Youngkwon

AU - Choi, Yun Young

AU - Yun, Nari

AU - Yang, Mingyu

AU - Jeon, Yonghee

AU - Kim, Ki Jae

AU - Choi, Jung Il

PY - 2018/12/31

Y1 - 2018/12/31

N2 - An activity gradient carbon felt (AGCF) electrode is prepared by a simple thermal oxidation method, which is composed of both a low activity electrode near the inlet side and a high activity electrode near the outlet side. The vanadium redox flow battery (VRFB) full cell with AGCF electrodes shows higher discharge capacity (18.7 Ah L−1) and coulomb efficiency (93.6%) than non-gradient carbon felt electrodes (14.3 Ah L−1, 88.4%) at a current density of 80 mA cm−2. From the computational analysis, the AGCF electrodes exhibit reduced overpotential results as well as improved uniform activity at low reactant concentration condition during charging and discharging at the current density. These results suggest that the AGCF electrode is an effective electrode design for high-performance VRFB featuring high energy density by improving electrolyte utilization as well as high roundtrip efficiency by improving energy efficiency.

AB - An activity gradient carbon felt (AGCF) electrode is prepared by a simple thermal oxidation method, which is composed of both a low activity electrode near the inlet side and a high activity electrode near the outlet side. The vanadium redox flow battery (VRFB) full cell with AGCF electrodes shows higher discharge capacity (18.7 Ah L−1) and coulomb efficiency (93.6%) than non-gradient carbon felt electrodes (14.3 Ah L−1, 88.4%) at a current density of 80 mA cm−2. From the computational analysis, the AGCF electrodes exhibit reduced overpotential results as well as improved uniform activity at low reactant concentration condition during charging and discharging at the current density. These results suggest that the AGCF electrode is an effective electrode design for high-performance VRFB featuring high energy density by improving electrolyte utilization as well as high roundtrip efficiency by improving energy efficiency.

UR - http://www.scopus.com/inward/record.url?scp=85054096370&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054096370&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2018.09.066

DO - 10.1016/j.jpowsour.2018.09.066

M3 - Article

AN - SCOPUS:85054096370

SP - 128

EP - 135

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -