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Application of manganese dioxide for preparing microorganism fuel cell cathode

A fuel cell cathode, manganese dioxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high cost, slow dissolution, loss of active centers, etc., and achieve the effect of high power output

Inactive Publication Date: 2009-01-28
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Metal platinum (Pt) has high electrocatalytic activity and chemical stability, and is the best ORR electrocatalyst, but the high price of Pt limits its wide use; transition metal macrocyclic complexes, such as CoTTMP (tetraphenyl porphyrin Phyloline), CoPC (cobalt phthalocyanine), etc. have high catalytic activity for oxygen reduction, and are expected to become substitutes for metal platinum. However, transition metal macrocyclic complexes have two defects as cathode ORR catalysts of microbial fuel cells: 1) The stability is not high, and the catalytic activity decays quickly with the running time, which is mainly due to the slow dissolution of the transition metal from the complex into the solution, resulting in the loss of the active center; 2) The preparation process is complicated, and the cost price is still relatively high
Manganese dioxide (MnO 2 ) is used as a catalyst in microbial fuel cells. Due to technical difficulties such as the production method, the ratio of raw materials, and the particularity of the anode microbial oxidation reaction, no relevant technical reports have been seen so far.

Method used

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  • Application of manganese dioxide for preparing microorganism fuel cell cathode
  • Application of manganese dioxide for preparing microorganism fuel cell cathode
  • Application of manganese dioxide for preparing microorganism fuel cell cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Electrode Preparation

[0052] Mix manganese dioxide powder, graphite powder, and polyvinylidene fluoride (PVDF) at a mass ratio of 65:20:15, add N-methylpyrrolidone into the mixture, stir into a paste and disperse ultrasonically for 30 minutes; Spread the paste mixture evenly on graphite paper, and then dry it at 100°C to obtain MnO 2 catalytic electrode. In the same way, high-purity graphite powder and binder are mixed at a mass ratio of 85:15 to prepare a graphite non-catalytic electrode for experimental comparison.

[0053] Step 2: Electrochemical Test

[0054] Cyclic Voltmetry (CV) uses a three-electrode system, with Pt rods ( ) is the counter electrode, potential range: -0.8~0V, Hg / HgO is the reference electrode, 1mol / L KOH is the electrolyte, nitrogen (or air) is passed for 15 minutes before the test, and the ventilated state is kept during the test. Investigating MnO at a scan rate of 1mV / s 2 Cyclic voltammetry performance of catalytic and graphite...

Embodiment 2

[0063] Step 1: Preparation of Catalytic Matrix Electrode

[0064] Mix manganese dioxide powder, graphite powder, and polyvinylidene fluoride (PVDF) at a mass ratio of 57:28:15 to 73:12:15, add N-methylpyrrolidone to the mixture, stir to form a paste and Ultrasonic dispersion for 30 minutes; spread the paste mixture evenly on carbon fiber cloth (4.0cm×4.0cm, MnO 2 Loading capacity 5.0±0.2mg / cm 2 ), and then dried at 100°C to obtain MnO 2 Catalytic substrate electrodes.

[0065] Step 2: Preparation of Membrane Composite Cathode

[0066] will be loaded with MnO 2 Catalytic substrate electrode cation exchange membrane (the side coated with the catalyst is in contact with the membrane) was hot-pressed at a temperature of 115° C. and a pressure of 14 MPa for 3 minutes, taken out and cooled to room temperature.

[0067] Step 3: Single-chamber MFC performance test

[0068] The electrogenic strain and the anolyte are the same as the double-chamber MFC in Example 1, but the anode ...

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Abstract

The invention discloses application of manganese dioxide for preparing a cathode of a microorganism fuel battery. The method comprises the following steps: the manganese dioxide is taken as a catalyst, the mixture of the catalyst, a conductive carbon material and a caking agent is coated on a conductive substrate to prepare the cathode of the microorganism fuel battery and a membrane composite cathode applied to the microorganism fuel battery. Compared with a non-catalytic electrode, MnO2 is taken as a cathode catalyst for remarkably increasing the reducing speed, reducing the polarization of the cathode and improving the energy output of the microorganism fuel battery; compared with the prior Pt catalyst, MnO2 has low price and wide source, and the microorganism fuel battery assembled by the catalyst of the cathode can operate stably for a long time and has high power output. The manganese dioxide for preparing the microorganism fuel battery electrode provides solid foundation for the commercial application of the microorganism fuel battery.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to the application of manganese dioxide in the preparation of microbial fuel cell cathodes. Background technique [0002] Energy scarcity and waste disposal are two major challenges facing the world today. [0003] Microbial fuel cells (MFC) is a power generation device that directly converts chemical energy in organic matter into electrical energy, and has dual functions of power generation and waste disposal. MFC has a wide range of fuel types. Slurry with high water content such as organic wastewater and human and animal manure can be used as fuel for MFC. It can effectively remove organic matter while generating electricity, so it is an advanced biomass energy utilization technology with great development potential. It is expected to become a pillar technology for future organic waste treatment. [0004] The basic principle of MFC is: organic matter is oxidized ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/86H01M4/88
CPCY02E60/50
Inventor 周顺桂张礼霞庄莉
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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