Samaria doped ceria electrolyte doped with nano-diamond powder, and preparation method thereof

Abstract

The invention discloses a samaria doped ceria electrolyte doped with nano-diamond powder, and a preparation method thereof, and belongs to the technical field of a new energy resource-solid oxide fuel cell. The components of the electrolyte comprise Sm <2>O<3>, CeO<2>, Ce<2O<3> and nano-diamond powder. The proportion of the nano-diamond powder is 1%-2% of the mass sum of the Sm <2>O<3>, CeO<2> and Ce<2O<3>. Through adoption of a glycine-nitrate method, the powder of the samaria doped ceria electrolyte doped with the nano-diamond powder is synthesized by adding the nano-diamond powder, then through adoption of a dry pressing method, the powder of the samaria doped ceria electrolyte doped with the nano-diamond powder is prepared into an electrolyte sheet; and the electrolyte sheet is sintered at a temperature of 1400 degrees centigrade. According to the electrolyte and the method, the nano-diamond powder is doped in the samaria doped ceria electrolyte, therefore the grain sizes are increased, moreover, the content proportion of cerium ions Ce<3+> is increased, the oxygen hole concentration is improved under jointed promotion of the increase of the grain sizes and the increase of the content proportion of the cerium ions, the ion mobility is improved, and the power of the single battery is improved.

Description

Technical field [0001] The invention belongs to the technical field of new energy-solid oxide fuel cell (abbreviated as: SOFC). In particular, it relates to a method in which samarium oxide doped cerium oxide (abbreviation: SDC) electrolyte is doped and catalyzed by nano-diamond powder (abbreviation: ND) to synthesize a novel SDC / ND composite SOFC electrolyte. Background technique [0002] SOFC single cell is composed of SDC electrolyte, anode and cathode. [0003] At present, there are many methods for preparing electrolyte powders. Different preparation methods will affect the microstructure of the product, such as particle size, grain boundary width and porosity between particles, and therefore the conductivity and activation energy of the obtained product are also affected. Compared with the solid phase method, hydrothermal method, sol-gel method and co-precipitation method, the glycine-nitrate method has the advantages of simple preparation, low calcination temperature, short...

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Problems solved by technology

However, the SOFC single cell made of SDC electrolyte material still has the following shortcomings and deficiencies: ① The electronic impedance of the SDC electrolyte is low, and the electrons generated on both sides of the anode and cathode have a partial electronic short circuit phenomenon inside the SDC electrolyte, which is called leakage (see figure 1 )

As a result, the internal impedance of the grain occupies a large area, which blocks the passage of oxygen ions inside the SDC electrolyte and affects the mobility of oxygen ions (see figure 2 )

③Due to the problems of low electronic impedance and low oxygen vacancy concentration of SDC electrolyte, the external circuit output current and output power of SOFC cells made of SDC electrolyte materials are reduced

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