Functionally graded anode composite membrane for solid oxide fuel cell and preparation method thereof

Abstract

The invention discloses a functionally-graded anode composite film of solid oxide fuel cells (SOFC) and a preparation method thereof. Three currently known anode materials, Cu-LSCM-CeO2 with excellent catalytic performance, Ni-YSZ with excellent toughness and mechanical strength property and Ni-ScSZ with superior electrochemically activity, are combined, so that a plurality of requirements on the anode can by undertaken by different functional layers, each layer is enabled to cooperate with each other, and an effect of complementary advantages can be achieved through synergy, thereby eliminating carbon deposition phenomena of methane and other hydrocarbon fuels on the anodes of the SOFC, and improving stability of the anodes in the methane and other hydrocarbon fuels and catalytic activities of the anodes for electrochemical reactions. Especially, the method is suitable for preparing large-size, high-performance and functionally-graded anode composite film of the solid oxide fuel cells through industrial production, is simple in technology, short in preparation period, low in cost, and suitable for industrial applications.

Description

Technical field [0001] The invention relates to a solid oxide fuel cell anode composite membrane, in particular to a solid oxide fuel cell anode composite membrane resistant to carbon deposition and a preparation method thereof. Background technique [0002] One of the outstanding features of the solid oxide fuel cell (SOFC) that distinguishes it from other fuel cells is its all-solid design and high operating temperature (about 600-1000°C). It can not only use pure hydrogen, but also methane (natural gas). The main component) and other hydrocarbons as fuel. However, the current solid oxide fuel cell using traditional Ni-YSZ as the anode has carbon deposition problems when it directly uses hydrocarbon fuel. The cause of carbon deposition is that Ni has a catalytic effect on the cracking reaction of hydrocarbons, which promotes the cracking of fuel into hydrogen and elemental carbon, thereby deteriorating battery performance. Therefore, in order to be able to directly use hydroc...

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Problems solved by technology

Due to the low melting point of Cu and its compounds, it is difficult to prepare Cu-CeO by traditional ceramic co-firing technology. 2 / YSZ anode supports the composite membrane, so it is mostly prepared by subsequent repeated impregnation methods, the process preparation cycle is long, the energy consumption is large, the quality control is also difficult, and the production cost is high, and its application is limited to a certain extent.