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A composite anode powder using pvp-k30 pore-forming agent and its preparation method
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A technology of PVP-K30 and composite anode, which is applied in the direction of battery electrodes, fuel cells, structural parts, etc., can solve the problems of low solubility, easy aggregation of pore-forming agents, and accelerated gas velocity, so as to reduce the process of grinding and doping , shorten the synthesis cycle, reduce the effect of concentration polarization
Active Publication Date: 2021-11-30
INNER MONGOLIA UNIV OF SCI & TECH
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[0002] With the rapid development of global industrialization, the excessive consumption of fossil fuels, the development of new energy sources and the protection of the environment have become today's themes, and the solid oxide fuel cell (SolidOxideFuelCell, SOFC) is a new type of green energy, not only environmentally friendly, but also High efficiency and light weight; but there are still some problems. SOFC batteries are composed of three parts. The research on electrolyte and cathode materials has been relatively mature, and the market has introduced corresponding material systems; under the development trend of low temperature in SOFC, the performance of anode materials is not It is ideal; however, the porosity of the anode itself during the sintering process is too low to meet the requirements of pore expansion; therefore, it is necessary to add a pore-forming agent to increase its porosity, and the increase in porosity can provide both fuel gas and reaction products. The diffusion channel can also accelerate the speed of gas reaching the three-phase reaction interface
[0003] At present, the widely used pore-forming agents are starch and carbon powder; most SOFC anode powders are synthesized by solid-phase mixing method, which is prepared by using sol-gel method or glycine-nitrate combustion method to prepare anode-electrolyte matrix powder, Mix with pore forming agents such as NiO, starch or activated carbon, and add the above raw materials into alcohol or isopropanol solvent by solid state ball milling method and mix evenly; the evenly mixed powder can be calcined at a certain temperature to obtain the synthesized powder; The disadvantage of this process is that the particle size of the synthesized powder is relatively large (generally >1 micron), and the pore-forming agent is easy to agglomerate to form large and sparse pores. Such an anode structure (such as figure 1 shown) is easy to collapse; when using carbon-containing anode materials, the anode is easy to form carbon deposits during the working process of the battery, which eventually leads to a short service life of the battery; the market price of starch is low, but the solubility is relatively low, even for water-soluble starch. High, which makes the doping process more difficult
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[0034] A method for preparing a composite anode powder using a PVP-K30 pore-forming agent, the reagents used are all analytical reagents, and the NiO-GDC composite anode powder is synthesized by a glycine-nitrate method; the specific steps are as follows:
[0035] (1) Weigh Gd(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and glycine, and PVP-K30 pore-forming agent, wherein Gd(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O and glycine are weighed according to the ratio of substances 1:4:5:25 (that is, the amount of substances NiO:GDC=1:1, total metal ions: glycine=1:2.5);
[0036] (2) Ce(NO 3 ) 3 ·6H 2 O, glycine dissolving is configured into the first solution; Gd(NO 3 ) 3 ·6H 2 O is dissolved and configured as the second solution; Ni(NO 3 ) 2 ·6H 2 O is dissolved and configured as the third solution; the PVP-K30 pore-forming agent is dissolved and configured as the fourth solution with deionized water; the above four solution...
Embodiment 1
[0048] In order to illustrate that the anode material prepared by the present invention has better advantages compared with the existing anode materials prepared by using carbon and starch, a comparative experiment is provided below for detailed description.
[0049] One), the experimental group is the anode powder prepared by the present invention and the anode green body and SOFC battery prepared by using the powder:
[0050] (1) Preparation of anode powder: The reagents used in the experiment are all analytical reagents. The preparation method of the anode powder prepared by the present invention is as described above. In the above preparation method, in step (1), respectively weigh PVP-K30 pore-forming The mass fraction of doping agent is 3%, 5%, and 7%; three kinds of anode powders with doping mass fractions of 3%, 5%, and 7% PVP-K30 are obtained;
[0051](2) Preparation of anode body: 3%, 5%, and 7% PVP-K30 anode powders are weighed at 0.5g each, and each anode powder we...
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Abstract
The present invention discloses a composite anode powder using PVP-K30 pore-forming agent and its preparation method. After repeated experimental research, the inventor has developed a composite anode powder using PVP-K30 as a raw material, and provides The preparation method of this kind of composite anode powder, and the application method of this powder on the SOFC battery; By comparative experimental research, the SOFC battery prepared by using the composite anode powder of the present invention has a larger SOFC battery than the SOFC battery prepared by using starch and carbon. Further, through experiments to study the effect of different contents of PVP-K30 on the porosity, microstructure and electrochemical performance of SOFC battery anode materials, it is found that the effect of adding PVP-K30 at 5% is one of the more superior solutions The preparation process of the anode powder of the present invention is simpler than the traditional carbon and starch preparation process of the anode powder, and the synthesis period is shortened.
Description
technical field [0001] The invention relates to the field of solid oxide fuel cells, in particular to a composite anode powder using a PVP-K30 pore-forming agent, a preparation method thereof, and an application of the anode powder in SOFC batteries. Background technique [0002] With the rapid development of global industrialization, the excessive consumption of fossil fuels, the development of new energy sources and the protection of the environment have become today's themes, and the solid oxide fuel cell (SolidOxideFuelCell, SOFC) is a new type of green energy, not only environmentally friendly, but also High efficiency and light weight; but there are still some problems. SOFC batteries are composed of three parts. The research on electrolyte and cathode materials has been relatively mature, and the market has introduced corresponding material systems; under the development trend of low temperature in SOFC, the performance of anode materials is not It is ideal; however, ...
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