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Composite cathode material for medium and low-temperature proton-conductive solid oxide fuel cells

A solid oxide and composite cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of electrode performance impact, proton transmission limitation, low ion conductivity, etc., and achieve the improvement of electrode performance, high oxygen Effects of ion conductivity and high electrocatalytic activity

Active Publication Date: 2013-07-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first type of electron conductor cathode material only conducts electrons, such as La 1-x Sr x MnO 3-δ (LSM), high electronic conductivity (>100 S cm -1 ), but its ionic conductivity is very low, 900 o C is only 5.9×10 -7 S cm -1 , is a pure electron conductor (I. Yasuda, K. Ogasawara, et al. Solid State Ionics 86-88 (1996): 1197-1201), in this type of material only electrons can achieve bulk diffusion, while oxygen ions and Protons are only surface diffused, so their three-phase interface area is very limited
The second type is oxygen ion-electron mixed conductors, such as perovskite La l-x Sr x CoO 3-δ (LSC) (R.A. De Souza, J.A. Kilner. Solid State Ionics 106 (1998): 175-187), this type of material has high electron conductance and oxygen ion conductance at the same time, but its proton transport is limited, and its three-phase The interface area is also small, which is not conducive to improving its electrochemical reaction rate
The third type is proton-electron mixed conductors. Currently, there are only a few materials, such as BaCeO doped with Fe and Bi elements at the B site. 3 Based cathode materials (Z. Tao, L. Bi, et al. Electrochemistry Communication 11 (2009): 688-690), but due to the limited transport of oxygen ions in this type of material, the three-phase interface cannot be expanded, and the electrode's Performance suffers

Method used

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  • Composite cathode material for medium and low-temperature proton-conductive solid oxide fuel cells
  • Composite cathode material for medium and low-temperature proton-conductive solid oxide fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: BaCo 0.7 Fe 0.22 Nb 0.08 o 3-δ Synthesis and chemical compatibility test of 50 wt% composite cathode material

[0020] By BaCo 0.7 Fe 0.22 Nb 0.08 o 3-δ The stoichiometric ratio, weigh an appropriate amount of BaCO 3 , Nb 2 o 5 , Fe 2 o 3 , Co(CH 3 COO) 2 4H 2 O is the raw material, using alcohol as the medium, put the raw material mixture into ZrO 2 Ball milled in a ball mill tank for 6 hours at a speed of 400 r / min to mix the raw materials evenly, put the suspension of the mixture in a glass dish, dry it in an oven, and pass through 1100 o C heat treatment for 10 h to obtain a pure-phase perovskite structure oxide, and then put the obtained oxide into a ball mill jar for grinding for 4 h to obtain a finer powder as the oxygen ion-proton phase BaCo 0.7 Fe 0.22 Nb 0.08 o 3-δ . Preparation of BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ , weigh an appropriate amount of Yb 2 o 3 , will Yb 2 o 3 Dissolve in concentrated nitric acid solutio...

Embodiment 2

[0022] Embodiment 2: BaCo with different ratios of two phases 0.7 Fe 0.22 Nb 0.08 o 3-δ -BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ Polarization resistance test

[0023] Press the two-phase material as BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ :BaCo 0.7 Fe 0.22 Nb 0.08 o 3-δ Mass ratios of 6:4, 5:5 and 4:6 were mixed evenly to obtain composite cathode powder. Mix the composite cathode powder and pore-forming agent soluble starch evenly at a mass ratio of 8:2, then add terpineol containing 10% ethyl cellulose as a binder to the powder, and the powder and binder The mass ratio is 6:4. The mixture was thoroughly ground until a homogeneous viscous cathode material slurry was obtained. The paste was uniformly coated on the dense BaZr by the screen printing method 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ After the surface of the electrolyte sheet is dried in an oven, it is placed in a high-temperature furnace at 1200 o C for 3 h to obtain a symmetrical battery.

[0024] Th...

Embodiment 3

[0025] Example 3: Preparation of anode-supported batteries composed of composite electrodes with different ratios and voltage-current density-power density curve test

[0026] According to the mass ratio of 4:6:2 BaCe 0.7 Zr 0.1 Y 0.1 Yb 0.1 o 3-δ , NiO and soluble starch are mixed, ball milled with absolute ethanol as the medium, and anode powder is obtained after drying, and an appropriate amount of PVA is added to the anode powder for dry pressing, and evenly sieved on one side of the formed anode body A small amount of electrolyte powder BaCe 0.7 Zr 0.1 Y 0.1 Yb 0.1 o 3-δ , secondary dry pressing to form the anode-electrolyte double-layer green body, after 1350 o C calcined at high temperature to obtain a dense circular diaphragm of the electrolyte.

[0027] Press the two-phase material as BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ :BaCo 0.7 Fe 0.22 Nb 0.08 o 3-δ Mass ratios of 6:4, 5:5 and 4:6 were mixed evenly to obtain composite cathode powder. Mix t...

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Abstract

The invention discloses a composite cathode material for medium and low-temperature proton-conductive solid oxide fuel cells, and belongs to the field of fuel cells. The composite cathode material is characterized in that BaCo<0.7>Fe<0.22>Nb<0.08>O<3-delta> with high oxygen ionic conductivity and high electronic conductivity and BaZr<0.1>Ce<0.7>Y<0.1>Yb<0.1>O<3-delta> with high proton conductivity are composited with each other to manufacture the novel cathode material, a chemical formula of the novel cathode material is BaCo<0.7>Fe<0.22>Nb<0.08>O<3-delta>-BaZr<0.1>Ce<0.7>Y<0.1>Yb<0.1>O<3-delta>, and a ratio of the phase BaCo<0.7>Fe<0.22>Nb<0.08>O<3-delta> to the phase BaZr<0.1>Ce<0.7>Y<0.1>Yb<0.1>O<3-delta> is changeable. The composite cathode material can be used for the medium and low-temperature proton-conductive solid oxide fuel cells. The composite cathode material has the advantages that after the BaCo<0.7>Fe<0.22>Nb<0.08>O<3-delta> and the BaZr<0.1>Ce<0.7>Y<0.1>Yb<0.1>O<3-delta> are composited, the cathode material has oxygen ionic conductivity, proton conductivity and electronic conductivity, a three-phase interface is expanded, the composite cathode material is excellent in electrode performance, the two phases of the composite cathode material are excellent in chemical compatibility and stable in performance, the cathode material is good in electro-catalysis performance owing to the presence of Co in the phase BaCo<0.7>Fe<0.22>Nb<0.08>O<3-delta>, interface resistance of each cell can be reduced, and the working performance of each cell can be improved.

Description

technical field [0001] The invention belongs to the field of fuel cells, in particular to a BaCo battery with higher oxygen ion and electron conductivity 0.7 Fe 0.22 Nb 0.08 o 3-δ and BaZr with high proton conductivity 0.1 Ce 0.7 Y 0.1 Yb 0.1 o 3-δ High-performance composite cathode materials for proton transport solid oxide fuel cells formed by compounding. Background technique [0002] Due to the high operating temperature of traditional solid oxide fuel cells, it puts forward strict requirements on electrode materials and connecting materials, resulting in poor stability and short life, which greatly limits its commercial development process. Therefore, reducing the operating temperature and developing medium and low temperature solid oxide fuel cells have become the main trend of solid oxide fuel cell development. [0003] Solid oxide fuel cells are mainly divided into two categories: traditional oxygen ion transport solid oxide fuel cells (O-SOFC) and proton tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86
CPCY02E60/50
Inventor 赵海雷杨春阳张欣欣张翠娟沈永娜
Owner UNIV OF SCI & TECH BEIJING
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