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Method for in-situ modification of three-dimensional carbon microbial fuel cell by nanometer porous molybdenum carbide

An in-situ modification and nanoporous technology, applied in biochemical fuel cells, battery electrodes, circuits, etc., can solve the problem that the power generation capacity of microbial fuel cells has not been studied, reduce the activation overpotential of microbial anodes, and unfavorable implantation and growth of power-producing microorganisms and other problems, to achieve the effect of good microbial electrocatalytic ability, small interface charge transfer resistance, and high biocatalyst loading

Inactive Publication Date: 2017-07-04
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN103985881A prepares the microbial fuel cell anode by calcining the prepared microporous polyacrylonitrile foam material, which effectively reduces the production cost, but the macroporous structure of the electrode material is insufficient, which is not conducive to the implantation and growth of electricity-producing microorganisms
Chinese patent CN104157884A proposes a method for preparing a three-dimensional microbial fuel cell anode by immersing a three-dimensional electrode brush in a graphene oxide dispersion and then freeze-drying it. The limited contact between the brushes is not conducive to the efficient transfer of electrons
In earlier research reports, molybdenum carbide has been preliminarily proven to be able to catalyze certain metabolic intermediates or products of microorganisms, thereby promoting the performance of microbial fuel cells, but the three-dimensional macropores modified by nanoscale molybdenum carbide The role of carbonaceous electrodes in reducing the overpotential of microbial anode activation and improving the power generation capacity of microbial fuel cells has not been studied

Method used

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  • Method for in-situ modification of three-dimensional carbon microbial fuel cell by nanometer porous molybdenum carbide
  • Method for in-situ modification of three-dimensional carbon microbial fuel cell by nanometer porous molybdenum carbide
  • Method for in-situ modification of three-dimensional carbon microbial fuel cell by nanometer porous molybdenum carbide

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Embodiment 1

[0032] 1) Cut the carbon felt with a thickness of 3mm into small pieces of 1cm×2cm size, place it in 50mL acetone solution for ultrasonic cleaning for 1 hour, transfer it to 50mL 1M dilute hydrochloric acid for ultrasonic cleaning for 1 hour, transfer it to 100mL distilled water for ultrasonic cleaning Wash for 1 hour to remove surface impurities, then boil in 100mL distilled water for 30 minutes, dry for later use or as a reference electrode;

[0033] 2) Place the flaky carbon felt treated in step 1) in 50mL 10mg mL -1 Horizontally shake and react in polydiallyldimethylammonium chloride solution for 12 hours, take it out and wash it with distilled water for 3 times;

[0034] 3) Place the carbon felt obtained in step 2) in 50mL 20mg mL -1 In the phosphomolybdic acid solution, shake the reaction horizontally for 12 hours, take it out, wash it with distilled water for 3 times, and dry it for later use;

[0035] 4) Place the carbon felt obtained in step 3) in a vacuum tube furn...

Embodiment 2

[0038] The concentration of the phosphomolybdic acid solution of step 3) in embodiment 1 is adjusted to 10mg mL -1 , the other steps are the same as in Example 1, that is, a three-dimensional carbon felt electrode modified in situ with nanoporous molybdenum carbide with a molybdenum carbide loading of about 4.08wt% is obtained.

Embodiment 3

[0040] The concentration of the phosphomolybdic acid solution of step 3) in embodiment 1 is adjusted to 40mg mL -1 , the other steps were the same as in Example 1, that is, a three-dimensional carbon felt electrode modified in situ with nanoporous molybdenum carbide with a molybdenum carbide loading of about 12.36 wt % was obtained.

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Abstract

The invention discloses a method for in-situ modification of a three-dimensional carbon microbial fuel cell by nanometer porous molybdenum carbide. According to the method, a carbon felt electrode is used as a substrate, phosphomolybdic acid is used as a molybdenum source, the porous-structured nanometer molybdenum carbide is uniformly grown on carbon felt fiber in an in-situ way by two steps of electrostatic self-assembly of a poly diallyldimethylammonium chloride medium and high-temperature carbonization under reduction atmosphere, and the method is simple in operation step and is controllable. The prepared three-dimensional composite electrode is applied to a positive electrode of the microbial fuel cell; and compared with a non-modified carbon felt electrode, the three-dimensional composite electrode has the advantages of larger electrochemical active area and better biological compatibility, and has unique electrocatalytic activation on oxidization-reduction reaction of an electron medium, the activation overpotential of the positive electrode is reduced, and the generation power density of the microbial fuel cell is remarkably improved.

Description

technical field [0001] The invention belongs to the field of energy materials, and relates to a method for in-situ modification of a three-dimensional carbon felt electrode by nanoporous molybdenum carbide, and also relates to a product prepared by the method and an application of the product in a microbial fuel cell anode. Background technique [0002] As the global energy crisis and environmental degradation become increasingly prominent, as a new green and sustainable energy technology that can generate electricity while treating organic waste such as sewage, microbial fuel cells have received extensive attention at home and abroad in recent years. However, its low power density and current output density are still the bottlenecks that limit the development and application of this emerging technology. Scientists at home and abroad have adopted a variety of technical means to solve this problem, such as improving the structure and surface properties of electrode materials ...

Claims

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Application Information

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IPC IPC(8): H01M8/16H01M4/86H01M4/88
CPCH01M4/86H01M4/8605H01M4/8647H01M4/88H01M8/16Y02E60/50
Inventor 邹龙黄运红龙中儿吴贤
Owner JIANGXI NORMAL UNIV
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