BaCoO3-delta base B-position Bi2O3-Nb2O5 co-doped cathode material of solid oxide fuel cell, preparation method and applications thereof

A fuel cell cathode and solid oxide technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as difficult structure stability, and achieve improved structural stability, good oxygen reduction catalytic activity, enhanced electrical conductivity and oxygen reduction The effect of catalytic performance

Inactive Publication Date: 2015-03-11
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

Although BaCoO 3 Based cathode materials have excellent theoretical properties, but there are few reports due to the difficulty in stabilizing their structures
[0006] After searching the prior art, it was found that, such as Novel SrCo 1-y Nb y o 3-δ cathodes for intermediate-temperature solid oxide fuel cells (high-performance intermediate-temperature solid oxide fuel cell cathode material SrCo 1-y Nb y o 3-δ , Journal of Powder Sources, 2010, 195 (12) 3772-3778. "Energy Journal", publication date 2009.12.24), which considered the SrCoO 3-δ Perovskite B site for Nb 2 o 5 The effect of doping on the oxygen reduction catalytic activity of cathode materials, but the effect on BaBi x co 1-x o 3-δ Perovskite B site for Nb 2 o 5 Effect of Doping on Oxygen Reduction Catalytic Activity of Cathode Materials

Method used

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  • BaCoO3-delta base B-position Bi2O3-Nb2O5 co-doped cathode material of solid oxide fuel cell, preparation method and applications thereof
  • BaCoO3-delta base B-position Bi2O3-Nb2O5 co-doped cathode material of solid oxide fuel cell, preparation method and applications thereof
  • BaCoO3-delta base B-position Bi2O3-Nb2O5 co-doped cathode material of solid oxide fuel cell, preparation method and applications thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a perovskite-type cathode material used in a medium-low temperature solid oxide fuel cell, and its chemical formula is BaBi x NbyCo 1-x-y o 3-δ , where δ represents oxygen excess or deficiency, -1≤δ≤1; x represents Bi 2 o 3 Doping amount, 0≤x≤0.15; y means Nb 2 o 5 The amount of doping, 0≤y≤0.2.

[0040] The cathode material used by the solid oxide fuel cell represented by the above chemical formula is B-site Bi 2 o 3 and Nb 2 o 5 Co-doped BaBi with perovskite crystal structure x Nb y co 1-x -y o 3-δ , by Bi 2 o 3 and Nb 2 o 5 Co-doping can improve the electrochemical performance in order to prepare SOFC cathode materials with stable structure and good chemical compatibility.

[0041] Depend on figure 2 It can be seen that when x=0.05, y=0, 0.05, 0.10, 0.15 or 0.20, BaBi 0.05 Nb y co 0.95-y o 3-δ It is indeed a perovskite structure; image 3 It can be seen that when y=0.10, x=0.05, 0.10 and 0.15, BaBi x Nb 0.1 co 0.9-...

Embodiment 2

[0043] This embodiment provides a low temperature solid oxide fuel cell cathode material BaBi in Embodiment 1 0.05 Nb y co 0.95-y o 3-δ The preparation and characterization method specifically include the following steps:

[0044] Step 1: Using metal oxides or carbonates as raw materials, weighing according to the stoichiometric formula, using anhydrous ethanol dispersant as the medium, and using a high-energy ball mill to mill for 12 hours;

[0045] Step 2: Initially calcine the precursor after ball milling at 900°C for 10 hours;

[0046] Step 3: After grinding the powder obtained by initial firing, final firing at 1100°C for 5 hours to obtain cathode powder;

[0047] Step 4: Add ethyl cellulose which accounts for 0.5-3% of the mass of the cathode powder, dry press it in a steel casting mold at 10-30 MPa for 5-15 minutes, and raise the temperature of the pressed sample to 900-900 °C in a high-temperature furnace Calcining at 1100° C. for 1 to 3 hours to prepare a dense s...

Embodiment 3

[0050] This embodiment provides a BaBi 0.05 Nb 0.15 co 0.8 o 3-δ The scheme of preparation and performance characterization, specifically includes the following experimental steps:

[0051] Step 1: Weigh 3.947 grams of analytically pure barium carbonate, 1.284 grams of tricobalt tetroxide, 0.399 grams of niobium pentoxide and 0.233 grams of bismuth trioxide, use 20 mL of absolute ethanol as a dispersant, and use a high-energy ball mill at a speed of 300 rpm Ball milling for 12h.

[0052] Step 2: drying the precursor after ball milling, and initial firing at 900-1100° C. for 10 hours in an air atmosphere, and then cooling down to room temperature. The XRD spectrum of the prepared powder is shown in figure 1 , indicating that the prepared cathode powder can indeed obtain a perovskite structure.

[0053] Step 3: The powder obtained by initial firing is ground and then finally fired at 1100°C for 5 hours to obtain the desired cobalt-based perovskite-type cathode powder BaBi ...

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Abstract

The invention discloses a BaCoO3-delta base B-position Bi2O3-Nb2O5 co-doped cathode material of solid oxide fuel cell, a preparation method and applications thereof. The provided cathode material has a perovskite type structure and is represented by a chemical formula: BaBi<x>Nb<y>Co<1-x-y>O<3-delta>, wherein the delta represents oxygen excess or oxygen deficiency (-1=<delta=<1), the x represents the doping amount of Bi2O3 (0=<x=<0.15), and the y represents the doping amount of Nb2O5 (0=<y=<0.2). The chemical compatibility between the provided BaBi<x>Nb<y>Co<1-x-y>O<3-delta> cathode material and the conventional electrolyte material such as GDC, and the like is good. In the air the current can be well conducted by the oxygen ions and electrons. In the temperature range of 450 to 850 DEG C, the provided cathode material has a very good oxidation-reduction catalytic activity. The cathode material is suitable for a solid oxide fuel cell used at a mid-low temperature.

Description

technical field [0001] The invention relates to a solid oxide fuel cell cathode material and its preparation method and application, in particular to a B-site co-doped Bi 2 o 3 and Nb 2 o 5 Elemental cobalt-containing BaCoO 3-δ Perovskite-based oxide cathode material and its preparation method and application. Background technique [0002] Solid Oxide Fuel Cell (SOFC) has been paid attention to by countries all over the world due to its high fuel adaptability, high energy conversion efficiency, low greenhouse gas emissions and high-quality waste heat generation, and a lot of manpower and material resources have been invested in it. research and develop. [0003] The operating temperature of traditional solid oxide fuel cells is 800-1000°C. In order to slow down the reaction between battery components to prolong battery life, and use cheap stainless steel connectors and ceramic sealing materials to reduce costs, the medium and low temperature of fuel cells (500~700℃) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86
CPCH01M4/8652Y02E60/50
Inventor 乐士儒孙克宁朱晓东贺绍飞关丽丽
Owner HARBIN INST OF TECH
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