A kind of stainless steel microbial electrode and its preparation method and application

Abstract

The invention discloses a stainless steel microbial electrode and its preparation method and application. The stainless steel material with a rough surface after acid treatment is soaked in a nano-carbon material dispersion liquid, and the stainless steel material absorbs the nano-carbon material by soaking and drying. Formation of nano-carbon-stainless steel composites. The nano-carbon-stainless steel composite material is heat-treated to form a stainless steel microbial electrode; the electrode is used as a bioelectrode in a microbial electrochemical system. The method of the present invention improves the interaction force between the nano-carbon material and the surface of the stainless steel material while ensuring that the stainless steel material has sufficient corrosion resistance; the nano-carbon material forms a surface modification layer on the surface of the stainless steel material, reduces the content of the Cr element, alleviates or even eliminates The inhibitory effect of Cr element on the growth of microorganisms is improved, the adhesion of the electrode to microorganisms is improved, and the internal resistance of the electrode is reduced. The prepared electrode has stable performance, excellent electrochemical performance, and excellent corrosion resistance and microbial adhesion.

Description

technical field [0001] The invention relates to a stainless steel microbial electrode and its preparation method and application. Background technique [0002] Microbial electrochemical system (MES), such as microbial fuel cells (MFC), is a type of organic matter that uses electroactive microorganisms to oxidize and decompose organic matter and release electrons to convert chemical energy into other forms of energy (such as electrical energy). an electrochemical device. The cost and performance of electrode materials play a very critical role in the development and application of MES. Carbon materials have good stability and microbial adhesion properties, so carbon materials with different structures and their composite materials have been widely used as electrode materials or current collectors for MES, which can be mainly divided into the following two categories: (1) bulk Or granular porous carbon materials, such as carbon paper, carbon fiber felt, reticulated glassy ca...

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Problems solved by technology

The Cr element in the stainless steel matrix is ​​exposed on the surface, which has an inhibitory effect on the biological activity of microorganisms, resulting in relatively poor adhesion of microorganisms on the surface of stainless steel. Therefore, the electricity generation efficiency of stainless steel directly as a microbial anode or microbial cathode is low.

[0004] Using chemical vapor deposition or flame synthesis to decorate a layer of carbon nanomaterials on stainless steel in situ can greatly improve the microbial attachment performance on the surface of stainless steel electrodes; however, methods such as chemical vapor deposition or flame synthesis require experience. High-temperature process (such as more than 800 ° C), and high-temperature heat treatment will change the surface composition and crystal structure of stainless steel, thereby greatly reducing the corrosion resistance of the stainless steel matrix; Applications are extremely limited

Carbon nanomaterials can also be modified to the surface of stainless steel by polymer bonding or direct adsorption to improve the adhesion of microorganisms; however, the polymer bonding method will bring greater internal resistance to the electrode, while direct adsorption The interaction between the nano-carbon and the stainless steel surface in the composite electrode prepared by the method is relatively small, and the performance is unstable.

Therefore, based on the modification of stainless steel materials, it is still difficult to obtain high-performance bioelectrodes that can be applied on a large scale in MES.

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