Method for preparing NiO-SDC metal oxide composite powder

Abstract

The invention relates to a method for preparing NiO-SDC metal oxide composite powder. The method is a homogeneous precipitation method taking nickelous nitrate, cerous nitrate and samaric nitrate as the raw material and urea as the precipitant, comprises the following steps of precipitating, separating, washing, drying, baking and crushing and is characterized in that the precipitating step, i.e., the precipitation reaction is finished at the same time under the conditions of microwave heating and material circulation flow of the hybrid reaction solution in a tubular reactor; after the reaction is finished, the NiO-SDC metal oxide composite powder is obtained by separating, washing, drying, baking and crushing. Due to the adoption of the microwave heating method, the temperature raising speed is high, the temperature is uniform, various oxides are precipitated together at the same time, the co-precipitation phase with consistent appearance and even size is obtained, and the grain diameter of the powder can be controlled by adjusting the concentration of the metallic ion and the urea and the reaction time.

Description

1. Technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of an anode material of a solid fuel cell, specifically a preparation method of a NiO-SDC metal oxide composite powder. 2. Background technology [0002] Metal oxide ceramic materials, especially multi-component composite metal oxide materials are functional materials with great application prospects in the high-tech field. For example, Ce 0.9 Gd 0.1 o 1.95 Due to its high ionic conductivity and low electronic conductivity at low temperature, it is considered to be the most potential electrolyte material for medium and low temperature solid oxide fuel cells. The anode of a solid oxide fuel cell is critical to its operation as it oxidizes the fuel to generate electricity. Ni-Ce 0.8 SM 0.2 o 1.9 (Ni-SDC) is the most suitable for Ce 0.9 Gd 0.1 o 1.95 Ideal anode material for electrolytes because Ni has good electrocatalytic activity a...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to mix NiO and SDC powder to make an anode, and then reduce it to form Ni-SDC material, but the performance is unstable due to uneven dispersion.

[0003] Although the solid state reaction method in the preparation method of composite metal oxide ceramic ultrafine powder has a simple process, because it requires multiple grinding and roasting, the obtained powder has poor uniformity, many impurities, poor activity, and uncontrollable morphology. shortcoming but not meeting needs

The chemical co-precipitation method, as disclosed in Janes S.Reed's "Principles of Ceramics Processing" (Principle of Ceramics Processing, U.S. John Wiley & Sons Company, published in 1995), has the advantages of simple method, wide selection of raw materials, and low manufacturing cost. , can be used to prepare micron-sized metal composite oxide powder, but because the solution tends to form local overconcentration during the process of dropping into the precipitant or metal salt solution, the obtained powder is not uniform, making the powder shape, particle size Disadvantages such as size and particle size distribution are difficult to control

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