Solid oxide fuel cell cathode material and application thereof

A fuel cell cathode and solid oxide technology, which is applied to fuel cell parts, battery electrodes, circuits, etc., can solve the problem of low catalytic activity and achieve the effect of simple process

Inactive Publication Date: 2009-12-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention aims to solve the problem of low catalytic activity of LSM (lanthanum strontium manganate) cathode material in solid oxide fuel cells, by introducing transition element titanium or Scandium, while adjusting the ratio of strontium and lanthanum at the A site, thereby changing the structure of the active components of the cathode material to improve the electrocatalytic oxygen reduction activity of the LSM (lanthanum strontium manganate) cathode material, and reduce the LSM (lanthanum strontium manganate) cathode The polarization overpotential increases the output power of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] La 0.8 Sr 0.2 Mn 0.98 Sc 0.02 O 3 Synthesis of : 2.61g La 2 O 3 Dissolve with dilute nitric acid (4ml concentrated nitric acid dissolved in 10ml water) to form La (NO 3 ) 3 , and then add 0.85 g Sr(NO 3 ) 2 , 0.136g Sc(NO 3 ) 3 .6H 2 O and 7.015g Mn (NO 3 ) 2 (50% by mass) solution was added to the above La (NO 3 ) 3 In aqueous solution, stir to dissolve completely and form a transparent solution. 7.82 g of triammonium citrate was added in a ratio of 1:1 between metal ions and triammonium citrate, and the pH was adjusted to 1-2 with nitric acid. Heat and stir to form a transparent and uniform gel, then burn on an electric stove to form a primary powder. A powder with regular particle shape is prepared. The fluffy primary powder was calcined at 900 °C for 3 h to obtain a scandium-doped lanthanum strontium manganese perovskite cathode material.

[0020] NiO-YSZ / YSZ two-in-one was prepared by co-firing method, and co-firing at appropriate temperature for...

Embodiment 2

[0022] La 0.8 Sr 0.2 Mn 0.95 Sc 0.05 O 3 Synthesis of : 2.61g La 2 O 3 Dissolve with dilute nitric acid (4ml concentrated nitric acid dissolved in 10ml water) to form La (NO 3 ) 3 , and then add 0.85 g Sr(NO 3 ) 2 , 0.339g Sc(NO 3 ) 3 .6H 2 O and 6.80g Mn (NO 3 ) 2 (50% by mass) solution was added to the above La (NO 3 ) 3 In aqueous solution, stir to dissolve completely and form a transparent solution. 7.86 g of triammonium citrate was added in a ratio of 1:1 between metal ions and triammonium citrate, and the pH was adjusted to 1-2 with nitric acid. Heat and stir to form a transparent and uniform gel, then burn on an electric stove to form a primary powder. A powder with regular particle shape is prepared. The fluffy primary powder was calcined at 900 °C for 3 h to obtain a scandium-doped lanthanum strontium manganese perovskite cathode material.

[0023] NiO-YSZ / YSZ two-in-one was prepared by co-firing method, and co-firing at appropriate temperature for ...

Embodiment 3

[0025] La 0.8 Sr 0.2 Mn 0.9 Ti 0.1 O 3 Synthesis of : 2.61g La 2 O 3 Dissolve with dilute nitric acid (4ml concentrated nitric acid dissolved in 10ml water) to form La (NO 3 ) 3 , and then add 0.85 g Sr(NO 3 ) 2 and 6.44gMn (NO 3 ) 2 (50% by mass) solution was added to the above La (NO 3 ) 3 In aqueous solution, stir to dissolve completely and form a transparent solution. 7.46 g of triammonium citrate was added in a ratio of 1:1 between metal ions and triammonium citrate, and the pH was adjusted to 1-2 with nitric acid. 0.68 g of butyl titanate was added to 1.99 g of ethylene glycol and stirred for 30 min. Heat to 70°C, dissolve 1.68 g of citric acid in the above solution, butyl titanate:citric acid:ethylene glycol=1:4:16. The above solution is added to the metal nitrate solution, heated and stirred to form a transparent and uniform sol. It is then burned on an electric furnace to form primary powder. The fluffy primary powder was calcined at 1100 °C for 3 h t...

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Abstract

The invention relates to a solid oxide fuel cell, in particular to a transition element titanium or scandium-doped LSM (La0.8Sr0.2MnO3-Delta) cathode material and an application thereof. The cathode material includes the following component: [La(1-x)Srx] (1-y)Mn(1-z)MzO(3+ / -delta), (X and Y are more than 0 but less than 1, Z is more than 0 but less than or equal to 1, and delta is more than -1 but less than 1), wherein M is titanium or scandium element. The solid oxide fuel cell cathode comprises 1-100 percent of the cathode material and 0-99 percent of electrolyte material according to the mass percent; and the electrolyte material is one or more of 5-20 mol percent of Y2O3 stabilized ZrO2, 5-20 mol percent of Sc2O3 stabilized ZrO2, SmxCe(1-x)O2, GdxCe (1-x)O2, YxCe(1-x)O2, LaxCe(1-x)O2 and La(1-x)SrxGa(1-y)MgyO3 (X and Y are more than 0 but less than 1). The activity of catalytic oxygen reduction reaction of the LSM cathode material can be enhanced, the reaction process of oxygen on the surface of the cathode material is quickened, and the cathode polarization is reduced, therefore, the output power of the solid oxide fuel cell is effectively improved, and the output performance of a 600 DEG C battery is enhanced by twice than that of the standard LSM battery.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a high-performance modified lanthanum strontium manganate (LSM) perovskite solid oxide fuel cell cathode material doped with transition element titanium or scandium and its application. Background technique [0002] Solid oxide fuel cell (SOFC) is a power generation technology that uses solid oxygen ion conductors as electrolyte membranes and can directly convert chemical energy into electrical energy. Solid oxide fuel cells are rich in fuel resources and can directly use natural gas, syngas, biogas, liquefied gas and other hydrocarbons as fuels; NO x and SO x Low emissions. SOFC power generation efficiency can reach 50%, and combined with other technologies (such as gas turbines), the power generation efficiency can reach 60-70%. [0003] A single cell is the core component of a solid oxide fuel cell, consisting of an electrolyte, an anode, and a cathode. with ABO 3 Lanthanum stro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02C04B35/00H01M4/90
CPCY02E60/50
Inventor 程谟杰刘斌岳响玲柳林候志芳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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