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Transition metal sulfide modified electrode and preparation method and application thereof

A transition metal, sulfide technology, applied in battery electrodes, circuits, fuel cells, etc., to achieve good catalytic activity, high conductivity, and good stability.

Pending Publication Date: 2022-06-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbon felt electrode has poor catalytic performance for the electrochemical redox reaction of polysulfur couples, which affects the performance of flow batteries

Method used

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  • Transition metal sulfide modified electrode and preparation method and application thereof
  • Transition metal sulfide modified electrode and preparation method and application thereof
  • Transition metal sulfide modified electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

Except (2): Weigh 1.8g of molybdenum powder, add 40mL of deionized water, and carry out magnetic stirring, then add 15mL of 30% hydrogen peroxide, and carry out magnetic stirring in an ice-water bath. After 5 hours, a transparent yellow liquid is obtained. The solution contains molybdenum At this time, the concentration of molybdenum ions in the solution is about 0.34M. Take part of the solution and dilute to constant volume to obtain a solution with a molybdenum ion concentration of 0.1M; use the above-mentioned solution containing 0.1M molybdenum ions as an electrochemical deposition solution, and heat treat the carbon felt As the working electrode, the platinum sheet as the counter electrode, and the saturated calomel electrode as the reference electrode constitute a three-electrode system, followed by constant potential deposition, the deposition voltages are -0.05V, -0.5V, -1V, and the deposition time is 60s, 120s, 180s; place the dried molybdenum disulfide-deposited carbon...

Embodiment 2

In addition to (2) the loading of transition metal sulfides on the pretreated carbon felt is as follows: dissolve 2.5mmol of thiourea and 2.5mmol of cobalt nitrate hexahydrate in 50mL of deionized water, stir well to obtain a mixed solution, and use it as an electrode Chemical deposition solution; the pretreated carbon felt is used as the working electrode, the platinum sheet is used as the counter electrode, and the Hg / HgO is used as the reference electrode. Within the range, 5, 8, and 10 cycles of electrochemical deposition were carried out at a scan rate of 5 mV / s. After deposition, the carbon felt electrode was taken out, washed repeatedly with alcohol and deionized water, and then vacuum-dried at 80°C for 10 hours to obtain a loaded Cobalt sulfide carbon felt.

[0048] All the other are identical with embodiment 1.

[0049] Example 7

Embodiment 3

(2) Loading of transition metal sulfides on the pretreated carbon felt is as follows: Weigh 0.12 g of potassium ferricyanide and 0.26 g of vitamin C, dissolve them in 40 mL of deionized water, and use vitamin C as a reducing agent. Ensure that the product ferrous disulfide is not oxidized, carry out magnetic stirring, then weigh 1.8g of sodium thiosulfate and dissolve it in 20mL of deionized water, stir to dissolve, add the aqueous sodium thiosulfate solution dropwise to the magnetically stirred ferricyanide Potassium and vitamin C mixed solution; transfer the above mixed solution to a 100mL polytetrafluoroethylene hydrothermal reaction kettle, immerse the pretreated carbon felt in the reaction kettle solution, hydrothermally react at 180°C for 24h, and then take out The reactor was naturally cooled to room temperature to obtain a carbon felt loaded with ferrous sulfide.

[0052] All the other are identical with embodiment 1.

[0053] Example 9

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Abstract

The invention discloses a transition metal sulfide modified electrode and a preparation method and application thereof, and the method comprises the following steps: transferring an original carbon felt into a muffle furnace, and carrying out heat treatment on the original carbon felt to obtain a pretreated carbon felt; carrying out transition metal sulfide loading on the pretreated carbon felt by any one of a solid phase method, an electro-deposition method, an electro-deposition composite solid phase method or a hydrothermal method; and heating the carbon felt loaded with the transition metal sulfide to 700-800 DEG C in a nitrogen atmosphere, and keeping the temperature for 2-4 hours to obtain a product, namely the transition metal sulfide modified electrode. The transition metal sulfide modified electrode has good hydrophilicity, promotes transmission of active substances in electrode reaction, has good catalytic activity on polysulfides, promotes conversion among the polysulfides, and improves the battery performance of a polysulfide system.

Description

technical field [0001] The invention belongs to the technical field of redox flow batteries, and in particular relates to a transition metal sulfide modified electrode and a preparation method and application thereof. Background technique [0002] Redox flow batteries (RFBs) are considered to be the most promising large-scale electrochemical energy storage technology due to their advantages of power and energy independence, simple and flexible design, long cycle life, fast charging and discharging, and low operating cost. Matching with wind power, photovoltaic and other renewable energy generation processes, it is used for power grid peak regulation and improves power grid stability and security. It is the first choice for large-scale power storage technology. Compared with the traditional all-vanadium flow batteries (VFBs), the flow battery system based on polysulfur redox couples has the characteristics of abundant resources and low cost, and has received extensive attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/96H01M8/18
CPCH01M4/8817H01M4/8825H01M4/8853H01M4/8889H01M4/90H01M4/96H01M4/8605H01M4/8647H01M8/188
Inventor 丁美闫苏贾传坤
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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