Method for preparing acicular metal Ni on inner surface of porous substrate at high temperature

Abstract

The invention relates to a method for preparing acicular metal Ni on the inner surface of a porous substrate at high temperature and relates to a preparation method of an Ni-based electrode of a solid oxide fuel cell. The invention aims at solving the problems that when a traditional Ni-based anode of the existing solid oxide fuel cell is applied at high temperature, the Ni-based anode is easy to be sintered, and the stability in long-term working is poor. The method provided by the invention comprises the following steps: 1) preparing a nickel metal salt precursor solution; 2) preparing a porous substrate framework; 3) performing a dipping process; 4) performing freeze-drying; 5) performing dipping-freeze-drying for a plurality of times; 6) preparing acicular NiO; and 7) preparing the acicular metal Ni, namely completing the process of preparing the acicular metal Ni on the inner surface of the porous substrate at high temperature. The method provided by the invention has the advantages of easiness in operation, convenience, quickness and high preparation efficiency, and the prepared metal Ni in the porous substrate has a special acicular structure and is less prone to being sintered and favorable to dipping the electrode and upgrading the stability in long-term working of the cell at high temperature. The method provided by the invention is applied to the fields of aviation, aerospace, new energy and new materials.

Description

technical field [0001] The invention relates to a preparation method of a Ni-based electrode of a solid oxide fuel cell. Background technique [0002] Solid Oxide Fuel Cell (SOFC), as an energy conversion device, has recently attracted widespread attention from all over the world. The main reason is that SOFC has a high energy conversion rate, which is beneficial to environmental protection. If pure hydrogen is used as fuel, the final reaction product of the SOFC system is water, which can be directly consumed by humans, and no harmful substances are produced during the reaction, so it is called clean energy. Generally, the energy conversion rate of SOFC can reach 60%. If combined heat and power is used, that is, SOFC provides heat output while providing power output, and its energy conversion rate can reach as high as 80%, which is 2 to 3 times that of ordinary thermal power generation. It is an out-and-out efficient energy source. [0003] The traditional anode material...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional Ni-based anode of the existing solid oxide fuel cell (SOFC) is easy to sinter during high-temperature application and has poor long-term working stability, thereby proposing a method for preparing needle-shaped metal on the inner surface of a porous substrate at high temperature. Ni's method

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