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Bismuth oxide-modified composite positive electrode material of high-temperature solid oxide electrolytic cell

A high-temperature solid, composite anode technology, applied in solid electrolyte fuel cells, battery electrodes, fuel cells, etc., can solve the problems of anode catalytic activity or poor stability, and achieve the effect of improving electrocatalytic activity and performance.

Inactive Publication Date: 2017-06-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem of poor catalytic activity or stability of the anode of the traditional high-temperature solid oxide electrolytic cell, the present invention provides a new composite anode material with high electrocatalytic activity and easy preparation

Method used

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  • Bismuth oxide-modified composite positive electrode material of high-temperature solid oxide electrolytic cell

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Embodiment 1

[0015] Synthetic Bi 1-x Y x o 1.5 -La 0.8 S r0.2 MnO 3+δ (x=0.23,0.30,0.58), wherein the molar ratio of the two is 1:1. Dissolve the nitrates of Y, Bi, La, Sr, and Mn in deionized water in proportion, and then add citric acid to keep the ratio of citric acid to metal ions at 2:1. Keep the pH of the solution at 8-10, and heat it under stirring to make it into a gel, and continue heating to cause spontaneous combustion. The resulting powder was calcined at 500°C for 1 hour to remove organic residues, then ground and slurried by adding n-butanol (containing ethylcellulose as a binder). Then the slurry is coated on the electrolyte surface of the Ni-YSZ / YSZ membrane electrode by screen printing, and baked at 1000°C for 3 hours to obtain the high-temperature solid with bismuth oxide modified composite anode according to the present invention oxide electrolytic cell.

Embodiment 2

[0017] Electrochemical performance test. The above-mentioned high-temperature solid oxide electrolytic cell containing bismuth oxide-modified composite anode was installed on the electrochemical performance evaluation equipment for testing. Control the cathode atmosphere to 50% H 2 -50%H 2 O, the flow rate is 200ml / min, and the anode atmosphere is 100% O 2 , the flow rate is 100ml / min. figure 1 for Bi 0.42 Y 0.58 o 1.5 -La 0.8 S r0.2 MnO 3+δ Polarization curves at various temperatures. The figure shows its comparison with LSM electrode and LSCF / GDC electrode. At the same temperature, the performance of bismuth oxide modified composite anode is much higher than that of LSM, and slightly higher than that of LSCF / GDC.

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Abstract

The invention relates to a bismuth oxide-modified composite positive electrode material of a high-temperature solid oxide electrolytic cell. The bismuth oxide-modified composite positive electrode material is characterized in that a conventional perovskite type positive electrode material is doped with bismuth oxide with stable rare earth oxide to form a bismuth oxide-perovskite composite material with 10-90% of bismuth oxide based on mass percentage. After compounding, the specific surface area, the electron-ion mixed electrical conductivity and the electrocatalytic activity of the material are all obviously improved; and when the bismuth oxide-modified composite positive electrode material is used as a positive electrode, the performance of the high-temperature solid oxide electrolytic cell can be effectively improved.

Description

technical field [0001] The invention relates to an anode material for a high-temperature solid oxide electrolytic cell, which is characterized in that the traditional perovskite-type anode material is modified by adding bismuth oxide stabilized by rare earth oxides, and the mass ratio of bismuth oxide formed is 10% to 90%. bismuth oxide-perovskite composites. Background technique [0002] The high-temperature solid oxide electrolytic cell is an electrolytic device operating at a medium-high temperature (600-800°C). Thanks to its high operating temperature, it can efficiently electrolyze water vapor to produce hydrogen and oxygen. At present, the design of solid oxide electrolytic cells basically follows the existing solid oxide fuel cell system, and its typical configuration uses a composite cermet material (Ni-YSZ) of metal nickel and yttria-stabilized zirconia as the cathode, and yttria-stabilized zirconia The zirconia (YSZ) is used as the electrolyte, and the perovskite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M8/1213
CPCH01M4/8652H01M4/8835H01M4/9033H01M8/12H01M2008/1293Y02E60/50
Inventor 程谟杰颜景波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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