Oxygen reduction cathode for preparing carbon-loaded nano MnO2 from NH3.H2O medium and MFC

Abstract

The invention relates to an oxygen reduction cathode for preparing carbon-loaded nano MnO2 from an NH3.H2O medium and an MFC. Nanometer MnO2 is loaded on a carbon-based material by using the carbon-based material such as a pretreated carbon brush, a pretreated carbon felt, a pretreated carbon cloth, a pretreated carbon paper and the like. The treatment method of the loaded nano MnO2 comprises the following steps: 1) adding a KMnO4 solution with the same volume and the concentration of 0.01-0.05 mol / L into a mixed solution medium of NH3.H2O and NaNO3 by using a peristaltic pump; 2) putting the pretreated carbon-based material into a mixed solution of NH3.H2O and KMnO4, and loading nano MnO2 generated by reducing the KMnO4 by the NH3.H2O on the carbon-based material. According to the invention, through compounding of the carbon-based material and MnO2, the defect of low O2 catalytic reduction activity of the carbon-based material is overcome, the advantage of high conductivity of the carbon-based material is also played, and MnO2 exists in the form of nano-scale particles and is highly dispersed, so that the cathode has higher O2 catalytic reduction activity.

Description

technical field [0001] The invention relates to the field of microbial electrochemistry, in particular to a 3 ·H 2 Preparation of carbon-supported nano-MnO by O media 2 As an oxygen reduction cathode and a microbial fuel cell (MFC) composed of the cathode. Background technique [0002] Microbial fuel cell (MFC) can convert the chemical energy of organic matter in water into electrical energy, and has broad development prospects in solving environmental and energy problems, and has become a hot spot in the field of environmental and energy research. [0003] Its air has a wide range of sources, low price, environmental friendliness, and O 2 The reduction reaction has a high redox potential, and the oxygen reduction cathode MFC has great potential for practical application. Currently, O 2 The electrode with the best catalytic reduction activity is the platinum carbon (Pt / C) electrode, which is also commonly used in MFC for O 2 Catalytic reduction cathode, but the cost of...

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Problems solved by technology

[0004] MnO 2 with higher O 2 Catalytic reduction activity, high theoretical specific capacitance, such properties are very suitable for the ideal MFC oxygen reduction cathode requirements, but MnO 2 The low conductivity limits its application in MFC oxygen reduction cathodes

[0005] So far, the performance of the economical MFC oxygen catalytic reduction cathode still needs to be greatly improved, and the ideal MFC oxygen catalytic reduction cathode is still being researched and explored, which cannot meet the actual needs of Yonghe

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