Gradient functional anode for carbon-based solid oxide fuel cell and preparation method thereof

Abstract

The invention discloses a gradient functional anode for a carbon-based solid oxide fuel cell and a preparation method thereof. The gradient functional anode includes a reforming catalytic layer, a transition layer and an electrochemical reaction layer functional layer; the reforming catalytic layer will be connected to the anode of the fuel cell The carbon-containing fuel is reformed into H2 and CO, so as to prevent the electrochemical reaction layer from directly contacting the carbon-containing fuel and improve the anti-carbon deposition performance of the anode; the electrochemical reaction layer is the place where H2 and CO electrochemically react to generate electricity; the transition layer is the matching The thermal expansion of the reforming catalyst layer and the electrochemical reaction layer maintains the structure and adhesion of the reforming catalyst layer. The invention lies in that the reforming catalytic layer adopts Ni-containing composite metal oxide, and undergoes an activation process in an anodic atmosphere to release nano-scale Ni catalytic active sites, and at the same time introduce metal oxide additives and carrier effects and undecomposed matrix The role of anchors is to enhance the anode's ability to resist carbon deposition. The preparation method of the invention is simple and suitable for large-scale production.

Description

Technical field [0001] The invention belongs to the field of fuel cell application, and relates to an anode for a carbon-based solid oxide fuel cell and a preparation method thereof. Background technique [0002] Coal has always been my country's main energy source, but the extensive use of coal-fired power generation and heat has become the main reason for frequent severe haze weather, forcing the country to take severe measures to reduce coal consumption. The reduction of coal consumption has had a serious impact on my country's coal industry. It has also magnified the contradiction between energy demand and supply, and has seriously affected the national energy strategic security. Therefore, considering the actual situation of my country's energy composition, vigorously developing clean coal energy utilization technology is the only way for my country's energy strategy. Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC), as a fuel cell operating at medium and high temperatur...

AI Technical Summary

Problems solved by technology

External reforming makes the heat transfer design of the system more complex, lowers the power generation efficiency, and increases the cost. It does not use SOFC technology for commercialization

SOFC can theoretically be reformed in reality at its working temperature, that is, the carbon-containing fuel can be directly reformed on the anode side of the battery, so that the external reformer can be omitted, the power generation efficiency can be improved, and the system cost can be reduced; however, the widely used Ni ‐YSZ (yttria-stabilized zirconia) anodes are very good when using carbon-containing fuels, because metal Ni is an excellent catalyst for hydrocarbon cracking, and the Ni‐YSZ anode metal Ni content is very high (volume ratio >30%). Carbon deposition reactions are prone to occur, and the battery will rupture during long-term operation. Therefore, the development of new anodes with excellent carbon deposition resistance is the key to the industrialization of carbon-based SOFCs.

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