Chitosan-transition metal ion composite modified cathode material as well as preparation method and application thereof

A transition metal ion, composite modification technology, applied in battery electrodes, biochemical fuel cells, electrical components, etc., can solve the problems of increasing the size of the cathode, improving the electrochemical performance, etc.

Active Publication Date: 2020-10-20
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, improving the electrochemical performance of the cathode by increasing the area of ​​the electrode requires a corresponding increase in the size of the cathode, which is not conducive to actual sea construction and equipment deployment, and has limitations, and the electrochemical performance is not improved much.

Method used

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  • Chitosan-transition metal ion composite modified cathode material as well as preparation method and application thereof
  • Chitosan-transition metal ion composite modified cathode material as well as preparation method and application thereof
  • Chitosan-transition metal ion composite modified cathode material as well as preparation method and application thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the composite modified cathode material described in the above technical scheme, including the following steps:

[0035] The carbon raw material is subjected to heat treatment and oxidation treatment in sequence to obtain a carbon material;

[0036] Mixing the carbon material, chitosan, pyridine and alkali to perform a chemical grafting reaction to obtain a chitosan grafted carbon material;

[0037] The chitosan grafted carbon material is mixed with the transition metal ion aqueous solution, and the complexation reaction is performed to obtain the composite modified cathode material.

[0038] In the present invention, the carbon raw material is sequentially heat-treated and oxidized to obtain the carbon material.

[0039] In the present invention, the carbon material is preferably a carbon fiber brush, carbon felt, carbon rod, carbon cloth, foamed carbon, carbon nanotube or graphite carbon, and more preferably a carbon fi...

Embodiment 1

[0061] Place the carbon fiber brush (diameter 50mm, length 300mm) in a muffle furnace at 300°C for heat treatment for 1 hour, then cool it, wash it with acetone, ultrasonic vibration, and then wash it with distilled water until there is no acetone residue, to obtain a heat-treated carbon fiber brush, denoted as Blank;

[0062] Dip 10g heat-treated carbon fiber brush in 400mL of 68% concentrated nitric acid by mass, shake at 90°C for 2h, wash with water until no concentrated nitric acid remains after the oxidation reaction, and obtain an oxidized carbon fiber brush, denoted as O;

[0063] Soak 10g of oxidized carbon fiber brush in 500mL chitosan acetic acid solution (5g chitosan, 500mL distilled water, 10% acetic acid drip to completely dissolve, and drip 3~5 drops of pyridine), react at 80℃ for 2h, and react During the process, 1 mL of 0.3 mol / L sodium hydroxide was added dropwise, and after the reaction, the residual chitosan and pyridine were washed to obtain the chitosan grafted ...

Embodiment 2

[0091] Place the carbon fiber brush (diameter 25mm, length 300mm, weight 5g) in a muffle furnace at 300°C for heat treatment for 1 hour, then cool it down, wash with acetone, ultrasonic vibration, and then wash with distilled water until there is no acetone residue to get the heat-treated carbon fiber brush;

[0092] Immerse 5g of heat-treated carbon fiber brush in 400mL of 68% concentrated nitric acid by mass, shake at 90°C for 2h, wash with water until no concentrated nitric acid remains after oxidation reaction, to obtain oxidized carbon fiber brush, denoted as O;

[0093] Soak 5g of oxidized carbon fiber brush in 500mL chitosan acetic acid solution (2.5g chitosan, 500mL distilled water, 10% acetic acid drop to completely dissolve, and drop 3 drops of pyridine), react at 80℃ for 2h, the reaction process Add 5 mL of 0.3 mol / L sodium hydroxide dropwise to the mixture, and wash the residual chitosan and pyridine after the reaction to obtain the chitosan grafted carbon material, whic...

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Abstract

The invention provides a chitosan-transition metal ion composite modified cathode material as well as a preparation method and application thereof, and belongs to the technical field of cathode material preparation. According to the chitosan-transition metal ion composite modified cathode material provided by the invention, chitosan with good biocompatibility is grafted on the surface of a carbonmaterial, and electron transfer mediator transition metal ions are introduced by utilizing extremely good coordination capability of the chitosan; the high-valence chitosan transition metal complex obtains electrons to be changed into a low-valence chitosan transition metal complex, and the low-valence chitosan transition metal complex is oxidized into the high-valence chitosan transition metal complex by dissolved oxygen in seawater. The reduction process of oxygen on a cathode is accelerated through the process, and then the polarization resistance and the power density are improved. The preparation method provided by the invention is simple, and chitosan and transition metal ions are successfully grafted to the carbon material.

Description

Technical field [0001] The invention relates to the technical field of cathode materials, in particular to a chitosan-transition metal ion composite modified cathode material and a preparation method and application thereof. Background technique [0002] Ocean exploration is an important means for people to conduct ocean research. They require continuous power to drive the instrument to work. Once the power is consumed, they will lose their function. Therefore, continuous and reliable power supply is the prerequisite and bottleneck for the operation of the instrument. Seafloor sediment microbial fuel cells (MSMFCs) are a new type of electrochemical device that can convert the chemical energy of organic matter in sediments into electrical energy. However, low output power, high operating costs and unstable performance severely restrict the practical application of MSMFCs. [0003] The main factors affecting the performance of MSMFCs include electricity-producing microorganisms, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M8/16
CPCH01M4/8882H01M4/9008H01M8/16H01M2004/8684Y02E60/50
Inventor 付玉彬郝耀康侯少鑫郭满刘昕沛宰学荣
Owner OCEAN UNIV OF CHINA
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