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High-power redox flow battery based on the criii/crvi redox couple and its mediated regeneration

A flow battery and battery technology, applied in the field of electrochemical batteries, can solve problems such as electrode scaling

Inactive Publication Date: 2018-05-04
CHROME PLATED POWER SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, the oxidant MnO with similar energy and power density 4 - The reduction of MnO leads to 2 rapid precipitation, especially leading to electrode fouling

Method used

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  • High-power redox flow battery based on the criii/crvi redox couple and its mediated regeneration
  • High-power redox flow battery based on the criii/crvi redox couple and its mediated regeneration
  • High-power redox flow battery based on the criii/crvi redox couple and its mediated regeneration

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Experimental program
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Effect test

Embodiment 1

[0093] The involvement of Cr was verified via cyclic voltammetry (CV) in the potential window of +0.2 to +1.5 V vs. Ag / AgCl 3+ with Ce 4+ The reaction produces Ce 3+ EC 催化 mechanism.

[0094] Figure 5 Two cases are shown: (1)5mM Ce on a flat / smooth Au electrode 4+ and 5mM Cr 2 o 7 2- and (2) 5mM Ce 4+ in aqueous 0.5M H 2 SO 4 solution in. exist Figure 5 , solutions (1) and (2) show Ce in the anodic (forward) scan at +1.44 V 3+ The peak of oxidation, where the oxidation current starts above +1.35 V and shows Ce in the cathodic (negative going) scan at +1.35 V 4+ The peak of the reduction, where the net reduction current starts from +1.40V. In CV, there is no Ce 3+ present in bulk solution, while all detected Ce 3+ Both derived from Ce 4+ reduction. In general, the generated Ce 3+ will diffuse into the bulk solution, but the process is slower and there is some Ce in the depletion region near the electrode surface detected in the anodic scan 3+ . Ce 3+ Gen...

Embodiment 2

[0098] Cr 2 o 7 2- and Ce 4+ Discharge / charge cycles of the solution confirmed the complete recovery of pristine Cr 2 o 7 2- reduction current. Figure 7 shown at 0.5M H 2 SO 4 2.5mM Cr at 250rpm 2 o 7 2- and 2.5mM Ce 4+ RDE voltammetry, where Cr 2 o 7 2- Reduction occurs at potentials 2 o 7 2- After a (not all) 2.5C discharge at 4000rpm; and (3) Cr 3+ After charging at 2.5C at 4000rpm. The mass-transport-limited currents in (1) and (3) agree, suggesting that pristine Cr 2 o 7 2- complete recovery of concentration.

Embodiment 3

[0100] It was observed that Cr in Demo 3 3+ charging via the expected asymmetric EC 催化 process happens. Figure 8A shows that 2.5C discharge (negative current and charge) occurs rapidly, taking only 11 minutes, while Figure 8B The charging takes 12 hours and 30 minutes. as for EC 催化 The reaction is expected via Ce 4+ Cr 3+ EC 催化 Charging is still faster than only by Ce 3+ Charging Ce 4+ Go faster. This passes at 0.5MH 2 SO 4 Discharge 2.5mM Ce at 4000rpm 4+ solution for 11 minutes ( Figure 8A ) and Ce using the same potential and rpm in Demo 3 (Fig. 8B, inset) 3+ Charge to Ce 4+ And prove. Ce 3+ Oxidation current is the presence of Cr in the solution 3+ 2.5 times of time.

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Abstract

This invention describes a high-power, high-energy oxidant (catholyte) chemistry based on dichromate (CrVI as Cr2O7<2->) for use with a variety of fuels (anolytes) in redox flow batteries (RFBs, alsoknown as reversible fuel cells), which reversibly store electricity as chemical energy. The reduction (discharge) of Cr2O7<2-> to Cr<3+> is natively irreversible at all investigated solid-state electrocatalysts, which has historically limited the employment of Cr2O7<2-> to primary (non-rechargeable) cells, such as Grenet cells. The described invention overcomes this limitation by using a reversible redox couple, hereafter electron mediator, to heterogeneously donate electrons to the cathode electrocatalyst and homogeneously accept electrons from Cr2O7<2-> to regenerate Cr2O7<2->. RFBs employing this energy- and power-dense chemistry are suitable for low-cost energy storage applications, ranging from grid-level storage of renewable electricity to consumer electronics.

Description

technical field [0001] The present invention describes a novel redox flow battery system, which is an electrochemical cell for electrical storage. Background technique [0002] Redox flow batteries (RFBs) are secondary (rechargeable) fuel cells and battery-fuel cell hybrids ( figure 1 ). Unlike conventional batteries, RFBs separate the energy and power of the system, thus, like fuel cells, have total system energy that varies with the size of the electroactive material reservoir and system power that varies with the size of the electrochemical reactor. This property makes them ideal for storing large amounts of electricity at low cost, since additional electroactive materials are usually much cheaper than large reactors. For this reason, RFBs are currently being used and further developed as large-scale grid-scale power storage devices (J. Power Sources 2006, 160, 716-732). This becomes especially valuable for intermittent renewable energy sources that require backup powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/96H01M8/18
CPCH01M4/921H01M4/96H01M8/188Y02E60/50C25B1/50H01M8/083
Inventor 大卫·艾伦·芬克尔斯坦
Owner CHROME PLATED POWER SAS
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