Low-temperature solid oxide fuel cell composite cathode material and preparation method of single fuel cell thereof

Abstract

The invention discloses a low-temperature solid oxide fuel cell composite cathode material and a preparation method of a single fuel cell thereof, and belongs to the field of chemical power supply solid oxide fuel cell materials. The problems that an existing cathode material is low in electrocatalytic activity and poor in high-temperature chemical stability are solved. The material is composed ofa Bi<0. 5>Sr<0. 5>Fe<0. 9>Sb<0. 1>O<3-delta> cathode and an La<0. 8>Sr<0. 2>O<3-delta> electronic conductor. The method comprises the following steps: 1, mixing a cathode and an electronic conductor,and adding terpilenol to obtain mixed slurry; and 2, brushing the surface of the GDC buffer layer with the mixed slurry, drying, and sintering to obtain the single fuel cell of which the composite cathode is Bi<0. 5>Sr<0. 5>Fe<0. 9>Sb<0. 1>O<3-delta>-La<0. 8>Sr<0. 2>O<3-delta>. According to the invention, the output power of the single fuel cell is effectively increased, the electro-catalytic performance of the fuel cell is improved, and the high-temperature chemical stability is very good. The invention is suitable for the composite cathode material of the low-temperature solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the field of chemical power source solid oxide fuel cell materials. Background technique [0002] Solid oxide fuel cell is an all-solid-state energy conversion device that can directly convert the chemical energy of fuel into electrical energy. century green energy. However, due to the high operating temperature (1000° C.) of the traditional solid oxide fuel cell, there are problems of poor high-temperature chemical stability and activation polarization loss of the cathode material. Therefore, exploring low-temperature (400-600°C) solid oxide fuel cells has become a research hotspot. However, the catalytic activity of the electrode decreases rapidly with the decrease of operating temperature, and the ohmic polarization resistance of the electrolyte increases accordingly. Due to the low ion-electronic conductivity and catalytic activity of traditional solid oxide battery cathode materials below 800 °C, their practical applica...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low electrocatalytic activity and poor high-temperature chemical stability of existing cathode materials, and provide a composite cathode material for a low-temperature solid oxide fuel cell and a preparation method for a single fuel cell thereof

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