The impact of modified electrode on the performance of an DHAQ/ K4Fe(CN)6 redox flow battery

Gao, Fanfan; Cai, Xinghua; Huang, Chengde

doi:10.1016/j.electacta.2021.138847

Cited by 10 publications

(20 citation statements)

References 61 publications

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“…Moreover, the discharge voltage reported in this study is almost 50 to 100 mV more than that reported in previous studies. 5,8,9,11,12,14,15,19–22…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the discharge voltage reported in this study is almost 50 to 100 mV more than that reported in previous studies. 5,8,9,11,12,14,15,[19][20][21][22] The cell was subjected to 300 GCD cycles with a cut-off voltage of 2.4 V, and 0.8 mL of anolyte and 0.4 mL of catholyte were withdrawn and diluted up to 2 mL using 1 M KOH separately for post-GCD analysis. During the 300 GCD cycles, the volume of anolyte increased by ∼2 mL, and the corresponding volume of water was lost in the cathode compartment.…”

Section: Resultsmentioning

confidence: 99%

“…Graphite felt of 6 mm thickness was activated thermally for 12 h at 400 °C to improve its hydrophilicity imparting oxygen-based functional groups on the felt. [14][15][16][17][18] This is a commonly followed process in the literature for activating graphite felt. Thus, the obtained electrode is abbreviated as TGF.…”

Section: Membrane Treatment and Electrolyte Preparationmentioning

confidence: 99%

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Use of voltage for recomposing degraded redox active molecules for flow battery applications

Sahoo

Ramanujam

2023

J. Mater. Chem. A

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“…Moreover, the discharge voltage reported in this study is almost 50 to 100 mV more than that reported in previous studies. 5,8,9,11,12,14,15,19–22…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Membrane Treatment and Electrolyte Preparationmentioning

confidence: 99%

See 1 more Smart Citation

Use of voltage for recomposing degraded redox active molecules for flow battery applications

Sahoo

Ramanujam

2023

J. Mater. Chem. A

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“…14 Unfortunately, the electrode or electrode engineering associated with organic RFBs is fewer. 15,16 We believe that electrode engineering is essential for organic RFBs as well. This is because the pristine or untreated electrode is not perfect or not suitable to use directly.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Cycling Stability of Anthraquinone-Based Redox Flow Batteries by Using Thermally Oxidized Carbon Felt

Xia

Huo

Zhang

et al. 2022

ACS Appl. Energy Mater.

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Electrochemical reactions occur on the surface of the electrode, so electrode modifications are essential for redox flow batteries (RFBs). Major works regarding electrode modifications focus on traditional RFBs like vanadium systems, but minor works stress on organic RFBs that represent a rapidly developed technology for large-scale energy storage. In this work, we employ thermal oxidation (600 °C) and investigate the effect of the heating time on a polyacrylonitrile-based carbon felt used in 2,6-dihydroxyanthraquinone (2,6-DHAQ)/K 4 Fe(CN) 6 RFBs. The structure of the carbon felt is characterized by thermogravimetric analysis, scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy methods. The electrochemical properties of 2,6-DHAQ are studied by cyclic voltammetry analysis. It is found that, when the heating time is set at 2.0 h, 2,6-DHAQ/K 4 Fe(CN) 6 RFBs exhibit a lower capacity decay rate at 0.0287% per cycle in 200 cycles, which is 3 times lower than the other cases. The results from 1 H nuclear magnetic resonance spectra unveil that the lower capacity loss is achieved by converting the byproduct anthrone back into 2,6-DHAQ at a slight cost of reducing Coulombic efficiency. Our work unambiguously demonstrates that the lifetime of anthraquinone-based RFBs can be effectively extended via thermal modification of electrodes.

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“…However, the energy density of AORFBs is still low 17‐20 . Previous reports indicate that the energy density and power of AORFB are affected not only by the solubility of the active material but also by the structure and electrocatalytic activity of the electrode 21‐25 . Therefore, in addition to the selection and structural adjustment of active materials, it is also important to use modified electrodes to improve the charge transfer capability and electrocatalysis of the electrodes 26‐30 …”

Section: Introductionmentioning

confidence: 99%

N, B codoped graphite felt for high‐performance 1,8‐dihydroxyanthraquinone redox flow battery

Deng¹,

Cai

Huang

2022

Energy Storage

Self Cite

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In this article, a graphite felt electrode was modified by NS double‐element and NB double‐element codoping. The surface morphology, crystal structure, element content, and surface chemical state of the modified electrode were characterized by scanning electron microscopy, X‐ray powder diffraction (XRD), Raman spectroscopy, and X‐ray photoelectron spectroscopy. The electrochemical performance of the modified electrode was evaluated by cyclic voltammetry, electrochemical impedance spectra, and a single cell. The results show that nitrogen (N) and boron (B) double‐element codoping can enhance the catalytic activity of graphite felt and create abundant defect sites, which increases the electrocatalytic activity by approximately a factor of 2. The reason why the doped graphite felt can obtain higher electrocatalytic activity may be related to the synergy between N and B atoms, especially the synergy between pyridine‐N and BC3, and the resistance of the first charge transfer reaction of 1,8‐dihydroxyanthraquinone on the doped graphite felt electrode is then reduced.

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The impact of modified electrode on the performance of an DHAQ/ K4Fe(CN)6 redox flow battery

Cited by 10 publications

References 61 publications

Use of voltage for recomposing degraded redox active molecules for flow battery applications

Use of voltage for recomposing degraded redox active molecules for flow battery applications

Enhancing the Cycling Stability of Anthraquinone-Based Redox Flow Batteries by Using Thermally Oxidized Carbon Felt

N, B codoped graphite felt for high‐performance 1,8‐dihydroxyanthraquinone redox flow battery

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