Synergistic Catalyst–Support Interactions in a Graphene–Mn<sub>3</sub>O<sub>4</sub>Electrocatalyst for Vanadium Redox Flow Batteries

Ejigu, Andinet; Edwards, Matthew; Walsh, Darren A.

doi:10.1021/acscatal.5b01973

Cited by 126 publications

(56 citation statements)

References 61 publications

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“…For example, MWCNTs [5], graphene nanosheets and carbon nanofibers [6,7], functionalization of carbon surface as N-and Ocontaining groups [8], metals such as Pt [6], Ir [9] and Bi [10] and metal oxides Mn 3 O 4 [11,12], WO 3 [13,14], TiO 2 [15], CeO 2 [16], PbO 2 [17], and Nb 2 O 5 [18] were deposited onto the CF supports to prepare modified electrodes. However, although all this research demonstrated an improvement in electrochemical kinetics, the enhanced power density is rarely discussed in the literature as a complementary performance evaluation to the charge/discharge experiments.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

Hosseini

Mousavihashemi

Murcia-López

et al. 2018

Carbon

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Although Vanadium Redox Flow Battery (VRFB) is well suitable for grid-scale application, their power-related cost must be reduced in order to boost the technology to the market, allowing their widespread commercialization. One effective way to make the VRFB a competitive and viable solution could be through the new strategies for improving the electrocatalytic activity of the electrodes with enhanced electrolyte/electrode interface characteristics. The greatly effective and enhanced-electron transfer could increase the current density with the decrement of the stack size. Herein, we report the synergistic effect demonstrated by N-and WO 3 -decorated carbon-based positive electrode, named HTNW electrode, which demonstrates the feasibility of achieving: i) enhanced electrocatalytic activity, indicating high rate towards VO 2+ /VO 2 + couple (promotion of oxygen and electron transfer processes), ii) decrement of the electron-transfer resistance from 75.62 Ω to 12.4 Ω for the pristine electrode and HTNW electrodes, respectively; iii) 51% of the electrolyte utilization ratio at high rates (i.e. 200 mA cm -2 ) with 70% of energy efficiency ; iv) increment of more than 50% of the power-peak in comparison with HT electrode.

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

Hosseini

Mousavihashemi

Murcia-López

et al. 2018

Carbon

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“…However, the sluggishness of redox couples on graphite felt, as the most commonly used electrode, limits the application of VRFB system [14]. However, the sluggishness of redox couples on graphite felt, as the most commonly used electrode, limits the application of VRFB system [14].…”

Section: Introductionmentioning

confidence: 99%

Graphite felt electrode modified by square wave potential pulse for vanadium redox flow battery

Jiang

Zhou

et al. 2016

Int. J. Energy Res.

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Summary In this paper, graphite felts treated by square wave potential pulse were modified as electrode for vanadium redox flow battery (VRFB). X‐ray photoelectron spectroscopy measurements indicated that the treatment for graphite felt can introduce oxygen‐containing groups on the surface. Moreover, graphite felt can also be etched to form nano‐scale pores, without damage of mechanical property by treatment. The formed nano‐scale pores and introduced oxygen‐containing groups can enhance the wettability of electrolyte on graphite felt and electrochemical kinetics of V(II)/V(III) and V(IV)/V(V) redox reactions. The treated graphite felt was employed as electrode to assemble the static cell, and its electrochemical performance was evaluated. The cell using modified graphite felt exhibits larger discharge capacity and energy efficiency compared with the pristine graphite felt. The average energy efficiency for graphite felt treated for 1600 s can reach 87.0% at 30 mA cm−2, 4.2% larger than that for the pristine graphite felt. This study demonstrates that the square wave potential pulse treatment is an efficient way to enhance the electrochemical properties of graphite felt for VRFB system. Copyright © 2016 John Wiley & Sons, Ltd.

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“…There are other Raman peaks in 200–400 cm −1 emerging in the MnOOH/CCs, which come from Mn‐O bending vibrations in the alpha‐MnO 2 type byproducts. These byproducts, as well as MnOOH NFs, were transformed to Mn 3 O 4 NPs in the thermal treatment process as indicated by the existence of a strong peak at 653 cm −1 , which is due to a Mn‐O stretching mode in Mn 3 O 4 phase …”

Section: Resultsmentioning

confidence: 99%

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries

et al. 2018

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Mn3O4 nanoparticle‐decorated carbon cloths are prepared as the electrodes for vanadium redox flow batteries. The Mn3O4 nanoparticles are prepared using a two‐step process, in which MnOOH nanoflakes are electrodeposited on the surface of the carbon cloth and subsequently converted to Mn3O4 nanoparticles by a thermal treatment. The prepared electrode exhibits a superior electrocatalytic activity toward the VII/VIII redox reaction. It is demonstrated that the peak potential separation of the VII/VIII redox reaction on the as‐prepared electrode is reduced from 402.0 mV to 82.4 mV at a scan rate of 5 mV s−1 when the pristine carbon cloth is deposited with Mn3O4 nanoparticles. The flow battery with carbon cloths decorated with 0.31 mg cm−2 of Mn3O4 nanoparticles as the electrode exhibits an energy efficiency of 88 %, which is 17 % higher than that of the battery assembled with the pristine carbon cloth at a current density of 100 mA cm−2. Therefore, the superior electrocatalytic activity of Mn3O4 nanoparticles reported offers a promising approach to improve the performance of carbon‐based electrodes, which can reduce the capital cost of vanadium redox flow batteries.

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Synergistic Catalyst–Support Interactions in a Graphene–Mn₃O₄Electrocatalyst for Vanadium Redox Flow Batteries

Cited by 126 publications

References 61 publications

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

Graphite felt electrode modified by square wave potential pulse for vanadium redox flow battery

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries

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Synergistic Catalyst–Support Interactions in a Graphene–Mn3O4Electrocatalyst for Vanadium Redox Flow Batteries

Cited by 126 publications

References 61 publications

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

High-power positive electrode based on synergistic effect of N- and WO3 -decorated carbon felt for vanadium redox flow batteries

Graphite felt electrode modified by square wave potential pulse for vanadium redox flow battery

Mn3O4 Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the VII/VIII Redox Reaction in Vanadium Redox Flow Batteries

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Synergistic Catalyst–Support Interactions in a Graphene–Mn₃O₄Electrocatalyst for Vanadium Redox Flow Batteries

Mn₃O₄ Nanoparticle‐Decorated Carbon Cloths with Superior Catalytic Activity for the V^II/V^III Redox Reaction in Vanadium Redox Flow Batteries