SMFC manganous-manganic oxide/tourmaline composite cathode and preparation method thereof

Abstract

The invention discloses an SMFC manganous-manganic oxide/tourmaline composite cathode. The SMFC manganous-manganic oxide/tourmaline composite cathode comprises a rolled activated carbon base material, a composite catalyst material and an adhesive, the rolled activated carbon base material comprises a stainless steel mesh, an air diffusion layer and a catalyst layer. The composite catalyst material is composed of modified manganous-manganic oxide and modified tourmaline. The manganous-manganic oxide and the tourmaline are subjected to modification treatment, nickel and aluminum are introduced into the manganous-manganic oxide, so that the nickel and the aluminum are uniformly dispersed in the manganous-manganic oxide, the specific surface area and the activity of the manganous-manganic oxide can be effectively improved, the tourmaline is subjected to physical and chemical modification by using titanium oxide, and the negative ion release amount of the tourmaline can be effectively improved. The negative ions have surface activity, reducibility and adsorbability, and the catalytic performance of the cathode material can be effectively improved by increasing the release amount of the negative ions.

Description

technical field [0001] The invention relates to the technical field of microbial fuel cells, in particular to an SMFC trimanganese tetraoxide / tourmaline composite cathode and a preparation method thereof. Background technique [0002] Sediment microbial fuel cell (SMFC) is a technology that uses electrochemical stimulation to enhance bioremediation. The anode is buried in anaerobic sediment, the cathode is placed in aerobic overlying water, and the two are connected by wires. Sediment microbial fuel cells can use organic matter in sediments as a substrate to generate electricity, harvest electricity while removing dissolved organic pollutants, and play a role in restoring the environment. Sediment microbial fuel cells have great potential to simultaneously solve energy and environmental problems faced by people. At present, the application directions of sediment microbial fuel cells mainly include providing electric energy for remote low-power monitoring sensors, treating a...

AI Technical Summary

Problems solved by technology

[0003] At present, the two problems faced by SMFC are high cost and low power generation efficiency.

Among them, the oxygen reduction reaction at the cathode is an important factor that limits the power generation efficiency of SMFC. Due to the slow kinetics of the oxygen reduction reaction, it is necessary to support platinum as a catalyst on the electrode material, but the cost of platinum is expensive, and it is not used in practical applications.

Non-noble metal catalysts such as transition metals and their oxides (such as manganese oxides) have been proven to replace the traditional expensive metal catalyst platinum, which has greatly reduced the cost of sediment microbial fuel cells, but the efficiency of power generation and the treatment of organic matter still remain There is a lot of room for improvement, to be further explored

On the other hand, as an emerging sewage treatment technology, the enlargement of the reactor is a technical bottleneck that must be overcome before its practical application. As far as the current traditional reactor structure is concerned, the cathode structure is too complicated, and it is time-consuming and laborious to manufacture. It has become a limiting factor for the expansion of the reactor, so the simplified research around the structure and fabrication of the cathode is also of practical significance

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