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Preparation method for graphene/ conductive polymer anode for microbial fuel cell

A conductive polymer, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low power generation efficiency, improve power generation performance, good biocompatible stability and electrochemical activity, and low cost Effect

Active Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a composite graphene microbial fuel cell anode for the low efficiency of existing microbial fuel cells. The present invention uses electrochemical methods to electrodeposit polypyrrole / electrochemical Reduction of graphene oxide composite film to prepare a new type of electrode

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  • Preparation method for graphene/ conductive polymer anode for microbial fuel cell
  • Preparation method for graphene/ conductive polymer anode for microbial fuel cell
  • Preparation method for graphene/ conductive polymer anode for microbial fuel cell

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Embodiment 1

[0022] Such as figure 1 As shown, the schematic diagram of the production process of the battery anode, in the figure 1 is the electrochemical workstation, 2 is the counter electrode, 3 is the reference electrode, 4 is the working electrode; where a refers to the mixed solution (pyrrole monomer and graphene oxide suspension aqueous solution), b refers to polypyrrole / graphene oxide composite film (constant voltage electropolymerization), c refers to polypyrrole / electrochemically reduced graphene oxide composite film (cyclic voltammetry reduction). Prepare the anode as follows:

[0023] (1) Dissolve 200 mg of graphene oxide in 40 mL of deionized water to a concentration of 5 mg·mL -1 aqueous suspension of graphene oxide. Then 8 mmol of pyrrole monomer was added to the graphene oxide aqueous suspension solution to prepare a mixed solution, and the concentration of the conductive polymer monomer in the mixed solution was 0.2 mol L -1 , after magnetic stirring at room temperatur...

Embodiment 2

[0030] The difference between this embodiment and Example 1 is that the electroplating amount is 60°C during the polymerization modification process of anodic constant voltage electroplating. Other conditions are all identical with specific embodiment 1. At this time, the maximum power density of the battery reaches 3351 mW / m 2 (See Figure 4 ).

Embodiment 3

[0032] The difference between this embodiment and Example 1 is that the anode is an unmodified pretreated graphite felt electrode. Other conditions are all identical with specific embodiment 1. The microbial fuel cell anode in this embodiment is the same as that in Embodiment 1. At this time, the maximum power density of the battery is only 180 mW / m 2 (See Figure 5 ).

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Abstract

The invention discloses a preparation method for a graphene / conductive polymer anode for a microbial fuel cell. The preparation method comprises the following steps: conductive polymer monomers and an aqueous suspension of graphene oxides are mixed, stirred at room temperature and subjected to ultrasonic treatment; by employing a constant voltage electroplating method, conductive polymer monomer / graphene oxide conductive composites are subjected to electrochemical polymerization and deposited on a surface of an anode; by employing a cyclic voltammetry, after situ electroreduction, a conductive polymer / electrochemical reduction graphene oxide modified anode is prepared on the electrode. The conductive polymer / electrochemical reduction graphene oxide modified anode is washed with deionized water and dried in the air at room temperature to prepare a graphene / conductive polymer anode for a microbial fuel cell. Compared to traditional chemical modification methods, the preparation method reduces the usage of toxic reagents and cumbersome processes, lowers the preparation cost, and is easy to realize industrialization of electrode preparation. When the modified electrode is used for a cell, the electricity generation capacity of a microbial fuel cell is raised observably, and the development and application of a microbial fuel cell can be promoted.

Description

technical field [0001] The invention relates to the field of microbial fuel cells, in particular to a method for preparing a graphene / conductive polymer anode for microbial fuel cells. Background technique [0002] Microbial fuel cell (MFC for short) is a fuel cell system that uses microorganisms as a catalyst to directly convert chemical energy in bioavailable organic matter into electrical energy. Research hotspots in the field of environment. However, the power generation power of MFC is lower than that of fuel cells. The main reason is that on the one hand, the ability of electricity-producing bacteria to transfer electrons to the anode is not strong, and on the other hand, due to the large resistance loss in the MFC system. The material and structure of the anode directly affect the attachment of microorganisms, electron transfer and oxidation of substrates. Therefore, seeking a highly electrochemically active anode with good electrical conductivity is an important di...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 冯春华吕志盛陈炎丰谢道海韦朝海
Owner SOUTH CHINA UNIV OF TECH
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