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Solid oxide fuel cell self-assembled high-performance core-shell structure cathode and preparation method thereof

A solid oxide and fuel cell technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as weak electronic conductivity

Active Publication Date: 2021-04-20
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, with K 2 NiF 4+δ type layered structure compound Ln 2 NiO 4+δ (Ln = La, Pr, Nd), which has good ionic conductivity and thermal expansion due to its high oxygen ion volume diffusion and surface exchange coefficient, but its electronic conductivity is relatively weak

Method used

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  • Solid oxide fuel cell self-assembled high-performance core-shell structure cathode and preparation method thereof
  • Solid oxide fuel cell self-assembled high-performance core-shell structure cathode and preparation method thereof
  • Solid oxide fuel cell self-assembled high-performance core-shell structure cathode and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: the preparation of material

[0028] (1) La(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O. Anhydrous citric acid is mixed with deionized water at a molar ratio of 4:2:9, stirred until clarified, then heated to obtain a gel, ground and calcined at 950°C for 3 hours to obtain a cathode powder;

[0029] (2) Mix cathode powder and binder to obtain cathode slurry, wherein the binder is a mixture of 96% terpineol and 4% ethyl cellulose;

[0030] (3) Coat the cathode slurry on the electrolyte and sinter at 1100°C for 2h, where the electrolyte is 14µm thick Zr 0.84 Y 0.16 o 2 with 2µm thick Gd 0.1 Ce 0.9 o 1.95 double layer electrolyte.

[0031] (4) Coat the sintered cathode with 5 μm thick Pt electrode paste, and then dry it at 150 °C for 1 h.

[0032] (5) Take out the battery sheet and seal it to make a full battery. At a working temperature of 750°C, the anode side is at H 2 atmosphere, the cathode side is in an air atmosphere. Apply 500mA·cm -2 The cur...

Embodiment 2

[0033] Embodiment 2: the preparation of material

[0034] (1) La(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O. Anhydrous citric acid is mixed with deionized water at a molar ratio of 4:2:9, stirred until clarified, then heated to obtain a gel, ground and calcined at 950°C for 3 hours to obtain a cathode powder;

[0035] (2) Mix cathode powder and binder to obtain cathode slurry, wherein the binder is a mixture of 96% terpineol and 4% ethyl cellulose;

[0036] (3) Coat the cathode slurry on the electrolyte and sinter at 1100°C for 2h, where the electrolyte is 14µm thick Zr 0.84 Y 0.16 o 2 with 2µm thick Gd 0.1 Ce 0.9 o 1.95 double layer electrolyte.

[0037] (4) Coat the sintered cathode with 5 μm thick Pt electrode paste, and then dry it at 150 °C for 1 h.

[0038] (5) Take out the battery sheet and seal it to make a full battery. At a working temperature of 750°C, the anode side is at H 2 atmosphere, the cathode side is in an air atmosphere. Apply 1500mA·cm -2 The cu...

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Abstract

The invention discloses a solid oxide fuel cell self-assembly high-performance Pt@La2NiO4 + delta core-shell structure cathode and a preparation method thereof. The preparation method specifically comprises the steps of (1) applying La2NiO4 + delta cathode slurry to an electrolyte and sintering for a certain period of time at a certain temperature; (2) coating the surface of the sintered cathode with Pt electrode slurry with a certain thickness, and drying for a period of time at a certain temperature; and (3) applying current to the cathode at a certain temperature and in a certain atmosphere, and carrying out electrochemical polarization for a certain period of time to prepare the high-performance Pt@La2NiO4 + delta core-shell structure cathode. And a Pt shell is formed on the surface of the La2NiO4 + delta cathode material through electrochemical polarization, so that the catalytic activity of the cathode material is effectively improved. The specific conditions are mild and controllable, the output performance of a solid oxide fuel cell is remarkably improved, and the method has a wide application prospect in the field of preparation of high-performance electrodes of fuel cells.

Description

technical field [0001] The invention belongs to the technical field of preparation of fuel cell catalytic materials, in particular to a solid oxide fuel cell self-assembled high-performance Pt@La 2 NiO 4+δ A cathode with a core-shell structure and a preparation method thereof. Background technique [0002] Solid oxide fuel cells (SOFCs) are electrochemical energy converters that can directly convert the chemical energy of fuels into electrical energy. Due to high efficiency and environmental friendliness, this type of fuel cell has been researched worldwide in the past few decades. More recently, research efforts in SOFC technology have focused on improving performance, as well as increasing durability and reliability. For example, with K 2 NiF 4+δ type layered structure compound Ln 2 NiO 4+δ (Ln = La, Pr, Nd), which has good ionic conductivity and thermal expansion due to its high oxygen ion volume diffusion and surface exchange coefficient, but its electronic conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M4/92
CPCY02E60/50
Inventor 陈孔发邹远锋张文清邵艳群王欣
Owner FUZHOU UNIV