Solid oxide fuel battery anode and its production

Abstract

A solid oxide fuel battery anode and the preparation method, the characteristic is: adulterates the titanic mine cadmium acid lanthanum or the titanate compound oxide as the anode structure framework and the main electron conducting phase, uses the ion infusing method, the macromolecule modeling board method, the sol-gel method, or the suspending grain pulp spreading method, prepares the nanometer grain anode active substance multi-hole film with the thickness of 0.05-5 micron in the inner and outer hole surface of the multi-hole anode structure framework; the anode active substance includes the ceric oxide, or the adulterating ceric oxide, or the zirconia based oxygen ionic conductor electrolyte, or the cerate based proton conductor electrolyte, or the mixture of the above active substance, or the above active substance adding a small quantity of Ni or Ni-Cu and V2O5. The invention is structure stabilization, high conducting rate, high catalyzing activity of the fuel oxidation, matching with the closing material at physics and chemistry, structure size stabilization, anti-carbon deposition, is fit for the fuel operation of the hydrocarbon directly.

Description

Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to an anode material of a solid oxide fuel cell directly fueled by hydrocarbons and an anode preparation method. Background technique: [0002] The British "Natural Materials" magazine ("Nature Materials", vol.3, 2004, 17-27) pointed out that: cermet anodes for solid oxidation fuel cells, such as Ni-YSZ, Ni-DCO, Cu-YSZ, Cu-DCO, Cu / Ni alloy-YSZ, Cu / Ni alloy-DCO, etc. (YSZ is Y 2 o 3 doped stabilized ZrO 2 Electrolyte, DCO is doped CeO 2 Electrolyte), using hydrogen as fuel, has good electrode performance, but operating with hydrocarbons as fuel, there are many problems: 1) Because the catalytic activity of Ni is too high, it is easy to cause carbon deposition on the anode and electrode performance decline or completely lose Function; 2) Poor oxidation-reduction resistance: the metal in the cermet anode is easy to oxidize, and the generated oxide often has a large volume chang...

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Problems solved by technology

[0002] The British "Natural Materials" magazine ("Nature Materials", vol.3, 2004, 17-27) pointed out that: cermet anodes for solid oxidation fuel cells, such as Ni-YSZ, Ni-DCO, Cu-YSZ, Cu-DCO, Cu / Ni alloy-YSZ, Cu / Ni alloy-DCO, etc. (YSZ is Y 2 o 3 doped stabilized ZrO 2 Electrolyte, DCO is doped CeO 2 Electrolyte), using hydrogen as fuel, has good electrode performance, but operating with hydrocarbons as fuel, there are many problems: 1) Because the catalytic activity of Ni is too high, it is easy to cause carbon deposition on the anode and electrode performance decline or completely lose Function; 2) Poor oxidation-reduction resistance: the metal in the cermet anode is easy to oxidize, and the generated oxide often has a large volume change

Therefore, during the anodic oxidation-reduction cycle, severe mechanical stress is prone to occur inside the electrode, causing the anode to crack or peel or fall off from the electrolyte layer; 3) poor sulfur resistance, while many hydrocarbon fuels in existing fuel systems All contain sulfide more or less; 4) Long-term high-temperature operation, the dispersed metal phase in the cermet anode is agglomerated, resulting in a serious decline in electrode performance

The article also pointed out that the use of doped perovskite-type lanthanum chromate and titanate single-phase composite oxide anodes, although the problems of carbon deposition on the anode and matching with adjacent materials have been solved, the fuel oxidation catalytic activity of the electrode still needs to be improved