Methods of producing anodes for solid oxide fuel cells
AssigneeKorea Institute of Science and Technology
InventorsChang-Sam KIM, Kyoung Ran HAN, Sang Whan PARK, Sung Woon JEON
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Abstract
Disclosed are methods of producing Ni/YSZ porous anode bodies for solid oxide fuel cells. According to the methods, a small amount of a nickel compound or salt is used as a pore former. Upon heating in air, the nickel compound or salt is decomposed into nickel oxide and releases gases, resulting in volume shrinkage. Therefore, Ni/YSZ porous bodies having a uniform pore size and reduction products thereof can be produced in an economical manner.
Claims12
A method of producing a Ni/zirconia-based porous body, comprising
- (a) mixing a zirconia raw material, nickel oxide, a thermally decomposable nickel salt and a binder,
- (b) forming the mixture into a green body, and heat treating the green body at a low temperature to remove decomposable materials from the green body,
- (c) sintering the heat-treated green body at a high temperature to obtain a sintered body, and
- (d) reducing the sintered body.
A method of producing a Ni/zirconia-based anode for a solid oxide fuel cell, the method comprising
- (a′) mixing a zirconia raw material, nickel oxide, a thermally decomposable nickel salt and a binder,
- (b′) forming the mixture into a green body having a shape selected from flat plates, flat tubes and tubes, and heat treating the green body at a low temperature to remove decomposable materials from the green body,
- (c′) sintering the heat-treated green body at a high temperature to obtain a sintered anode body, and
- (d′) reducing the sintered anode body.
A method of producing an anode having a Ni/zirconia-based functional layer for a solid oxide fuel cell, the method comprising
- (a″) mixing a zirconia raw material, nickel oxide, a thermally decomposable nickel salt and a binder,
- (b″) forming the mixture into a green body having a shape selected from flat plates, flat tubes and tubes, and heat treating the green body at a low temperature to remove decomposable materials from the green body,
- (c″) preliminarily sintering the heat-treated green body to obtain a preliminarily sintered anode body,
- (d″) applying the mixture to the preliminarily sintered anode body by a process selected from slip casting, tape casting and spray to cover a functional layer on the surface of the preliminarily sintered anode body,
- (e″) sintering the preliminarily sintered anode body covered with the functional layer at a high temperature, and
- (f″) reducing the sintered anode body covered with the sintered functional layer.
A method of manufacturing a solid oxide fuel cell, the method comprising
- (A) mixing a zirconia raw material, nickel oxide, a thermally decomposable nickel salt and a binder,
- (B) forming the mixture into a green body having a shape selected from flat plates, flat tubes and tubes, and primarily heat treating the green body to remove decomposable materials from the green body,
- (C) primarily sintering the primarily heat-treated green body to obtain a sintered anode body,
- (D) coating an electrolyte on the sintered anode, followed by secondary sintering to form an electrolyte layer on the anode,
- (E) coating a cathode on the electrolyte layer, followed by secondary heat treatment, and
- (F) reducing the anode, the electrolyte layer and the cathode.
A method of manufacturing a solid oxide fuel cell, the method comprising
- (A) mixing a zirconia raw material, nickel oxide, a thermally decomposable nickel salt and a binder,
- (B) forming the mixture into a green body having a shape selected from flat plates, flat tubes and tubes, and primarily heat treating the green body to remove decomposable materials from the green body,
- (C) preliminarily sintering the primarily heat-treated green body to obtain a sintered anode body,
- (C′) applying the mixture to the preliminarily sintered anode body by a process selected from slip casting, tape casting and spray to cover a functional layer on the surface of the anode,
- (C″) primarily sintering the anode covered with the functional layer,
- (D′) coating an electrolyte on the functional layer covered on the anode, followed by secondary sintering to form an electrolyte layer on the functional layer,
- (E′) coating a cathode on the electrolyte layer, followed by secondary heat treatment, and
- (F) reducing the anode, the functional layer, the electrolyte layer and the cathode.
Dependencies are inferred from the claim text.