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Middle temperature solid oxide fuel cell electrolyte and preparation method thereof

A solid oxide and fuel cell technology, applied in fuel cells, electrolytes, circuits, etc., can solve the problems of poor battery sealing performance, high requirements for connector materials, and densification of electrodes, so as to achieve improved electrochemical performance and small size , the effect of reducing the working temperature

Active Publication Date: 2017-06-13
FUZHOU UNIVERSITY
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Problems solved by technology

[0004] The electrolyte of SOFC that has been commercially applied is Y 2 o 3 Stable zirconia (YSZ for short) and the working temperature are generally 1000 ° C. Working at such a high temperature causes SOFC to have many problems: electrode densification, high requirements for connector materials, poor battery sealing performance, and increased costs.
The traditional electrolyte YSZ material is no longer suitable for working in a medium temperature environment. Therefore, it is extremely important to find an electrolyte material with high conductivity and good stability at medium and low temperatures

Method used

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  • Middle temperature solid oxide fuel cell electrolyte and preparation method thereof
  • Middle temperature solid oxide fuel cell electrolyte and preparation method thereof
  • Middle temperature solid oxide fuel cell electrolyte and preparation method thereof

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Embodiment 1

[0032] (1) 1 mole La 1.85 Na 0.15 Ce 2 o 7-δ (LNC) preparation:

[0033] Prepare 0.01mol La1.85 Na 0.15 Ce 2 o 7-δ :

[0034] Weigh 1.85 moles of La(NO 3 ) 3 ·nH 2 O: 1.85×324.92= 601.102 grams;

[0035] Weigh 0.15 moles of NaNO 3 : 0.15×84.99=12.749 grams;

[0036] Weigh 2 moles of Ce(NO 3 ) 3 ·6H 2 O: 2×434.22=868.440 grams;

[0037] Weigh 6 moles of citric acid: 6×210.14=1260.840 grams;

[0038] (2) NaNO 3、 Ce(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 and citric acid were dissolved in deionized water respectively;

[0039] (3) Pour all the above solutions into the citric acid solution, add ammonia water dropwise to adjust the pH value to 7;

[0040] (4) Put the mixed solution into a stirrer and heat it to 70°C, stir continuously at 70°C, and add ammonia water during the stirring process to keep the pH value of the solution at 7 until a gel is formed;

[0041] (5) Move the gel into an evaporating dish and heat it on an electric furnace until self-propagating com...

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Abstract

The invention relates to a middle temperature solid oxide fuel cell electrolyte and a preparation method thereof. A sol-gel burning method is adopted for preparing the middle temperature solid oxide fuel cell electrolyte with proton conductivity. The molecular formula of the electrolyte is La1.85Na0.15Ce2O7-delta, wherein delta is more than 0 but less than 0.15. The relative density reaches up to 99.0%. The conductivity can reach up to 1.38*10-2S / cm when the electrolyte is under the mixed atmosphere of dry 5% H2 and 95% Ar at 700 DEG C.

Description

technical field [0001] The invention belongs to the field of preparation of solid electrolytes, in particular to a medium temperature solid oxide fuel cell electrolyte and a preparation method thereof. Background technique [0002] The discovery and utilization of energy has promoted the progress and development of human civilization and brought great convenience to human life. However, with the explosive growth of human population and the continuous improvement of human quality of life, people's demand for energy It is also increasing year by year, and the resulting environmental problems are increasingly affecting people's lives, and even threatening people's lives and health. Therefore, how to use fossil fuels rationally and efficiently is one of the difficulties faced by human beings. [0003] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, referred to as SOFC) belongs to the third-generation fuel cell, which is an all-solid-state device that directly converts the chemica...

Claims

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Application Information

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IPC IPC(8): H01M8/126
CPCH01M8/126H01M2008/1293H01M2300/0074Y02E60/50
Inventor 彭开萍涂太平刘建
Owner FUZHOU UNIVERSITY
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