Toto Ltd.

Megumi Shimazu

Akira Kawakami

Shigeru Ando

Yuya Takahashi

Chihiro Kobayashi

Naoki Watanabe

Katsuhisa Tsuchiya

Toshiharu Otsuka

Shuichiro Saigan

Nobuo Isaka

Takuya Matsuo

Yousuke Akagi

Yasuo Kakinuma

Koji Omoshiki

Toshiya Abe

Akira Ueno

Kenichi Hiwatashi

Akira Ishiguro

Motoyasu Miyao

Hiroshi Niimi

Mitsunobu Shiono

Masato Ota

To provide a solid oxide fuel cell system capable of avoiding the reduction of air electrodes. The present invention is a solid oxide fuel cell system including: a fuel cell module, a fuel supply apparatus, a water supply apparatus, an oxidant gas supply apparatus, a reformer, and a control section for controlling the extraction of power, whereby the controller having a shutdown stop circuit for executing a shutdown stop when the fuel cell stack is above the predetermined temperature, and after a shutdown stop, during a period when pressure on the fuel electrode side is sufficiently higher than pressure on the air electrode side, and no reverse flow of oxidant gas to the fuel electrode side is occurring, a temperature drop operation is executed whereby high temperature oxidant gas remaining on the oxidant gas electrode side is discharged.

Solid oxide fuel cell system

Provided is a solid oxide fuel cell having a service life of approximately 90,000 hours, a level required to encourage the widespread use of SOFC. The solid oxide fuel cell is provided with a solid electrolyte layer, an oxygen electrode layer provided on one side of the solid electrolyte layer, and a fuel electrode layer provided on the other side of the solid electrolyte layer. The oxygen electrode layer is made from a material containing iron or manganese, and the solid electrolyte layer contains an yttria-stabilized zirconia solid electrolyte material having a lanthanoid oxide dissolved therein.

Solid oxide fuel cell

Disclosed is a durable solid oxide fuel cell that is less likely to have a problem of a conventional solid oxide fuel cell that an air electrode containing a peroviskite oxide, when exposed to a reducing atmosphere, is separated at the stop of operation, especially shutdown. The solid oxide fuel cell includes an air electrode that is obtained by firing a compact containing a perovskite oxide and sulfur element. The content of the sulfur element in the air electrode as fresh after firing or before the start of power generation is in the range of 50 ppm to 3,000 ppm. The separation of the air electrode is effectively suppressed at the shutdown operation.

In a fuel cell unitthat constitutes a fuel cell moduleof an SOFC device, a collector capis connected to an inner electrode layervia a seal materialas an Ag seal portion. A glass coating(dense body) is filled up between the inner electrode layerand an electrolyte layerand the collector capto cover an upper end surfaceof the seal material. As such, the fuel cell unitincludes the seal materialconstituting as an Ag seal portion that separates a fuel gas from an oxidant gas, and a glass coatingat least partially formed to over at least either the fuel gas side surface of the seal materialor an the oxidant gas side surface of the seal material

Solid oxide fuel cell device

Growing community of inventors

Chigasaki, Japan

Megumi Shimazu