Intermediate-temperature solid oxide fuel cell cathode material and preparation method and application thereof

Abstract

The invention discloses a Ta-Mo co-dopping SrFeO<3-delta>-based perovskite type intermediate-temperature solid oxide fuel cell cathode material and a preparation method and application thereof. A chemical formula of the cathode material is SrTa<x>Mo<y>Fe<1-x-y>O<3-delta>, wherein x is doping amount of Ta, x is greater than 0 and is smaller than or equal to 0.15, y is the doping content of Mo, y isgreater than 0 and is smaller than or equal to 0.15, delta is content of oxygen vacancy, and the delta is greater than or equal to 0 and is smaller than or equal to 0.5. The cathode material is prepared through adoption of a sol-gel-solid phase two-step method. According to the cathode material, the method and the application, Ta and Mo codoping is carried out on SrFeO<3-delta> through utilization of stable Ta<5+> and Mo<6+> with high valence states, Fe in the SrFeO<3-delta> is replaced by the Ta and the Mo, the cathode material which is stable in structure at intermediate-temperature area and is good in oxygen reduction catalytic activity can be obtained. The method is applicable to preparation of an intermediate-temperature solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular relates to a perovskite type intermediate temperature solid oxide fuel cell cathode material and its preparation and application. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, referred to as SOFC) is an all-solid-state energy conversion device, which can directly convert the chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner. The green energy technology is of great significance to meet the power demand, alleviate the energy crisis, protect the ecological environment and ensure national security; the traditional SOFC operating temperature is high (800-1000 ℃), resulting in poor stability, short life and high cost , which limits its large-scale commercial application, so reducing the working temperature of SOFC to medium temperature (600-800°C) is the current research fo...

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Problems solved by technology

[0005] The purpose of the present invention is aimed at SrFeO in the prior art 3-δ Based on the problems of low electrochemical catalytic activity and high interfacial polarization resistance of perovskite-based cathode materials, a perovskite-type intermediate temperature solid oxide fuel cell cathode material and its preparation method and application are provided. Ta 5+ and Mo 6+ to SrFeO 3-δ Co-doping of Ta and Mo is carried out, and SrFeO is co-substituted by Ta and Mo 3-δ Fe in the medium temperature range can obtain a new type of SOFC cathode material with stable performance and good electrochemical catalytic performance, which can effectively reduce the SrFeO 3-δ Interfacial polarization resistance of perovskite-based cathode materials in the medium temperature region, and significantly improve their electrochemical catalytic activity

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