Hyundai Motor Company

Korea Institute of Science and Technology

Kia Motors Corporation

Samsung Electronics Co., Ltd.

Kia Corporation

Min Kyung Cho

Jun Young Kim

Dong Hyun Kim

Won Jung Kim

Jong Hyun Jang

Sung Jong Yoo

Hyun Seo Park

Byung Won Cho

Hee-Young Park

Dong Won Chun

Kyung Yoon Chung

Ji-young Kim

Wan Soo Lim

Hyungseok Kim

Hun-Gi Jung

Jaeho Park

Jin-Yoo Suh

Minah Lee

Young-Su Lee

Hyun Bae Dong

Hyun Jung Song

Ju Hae Jung

Seungho Yu

Jaeyoung Hong

Jee-Hwan Bae

Juhyeon Ahn

Myung Su Lim

Disclosed is a unitized regenerative fuel cell system, comprised of a unitized regenerative fuel cell able to operate in a fuel cell mode for electric power generation and in a water electrolysis mode for hydrogen and oxygen production, and a plurality of fire-detecting sensors for detecting fire in each zone of a tunnel, and configured to supply oxygen to zones wherein fire has not occurred if occurrence of fire has been detected in a tunnel, and a method for controlling the same.

Unitized regenerative fuel cell system for tunnel and method for controlling the same

Disclosed is a method of preparing a cathode active material useful in a sodium ion secondary battery having high reversible capacity and excellent cycle characteristics. The method for preparing a cathode active material composed of Zr-doped NaLiMOincludes the steps of (A) doping LiMOwith Zrto provide Zr-doped LiMO; and (B) dissociating Li ion from the Zr-doped LiMOand inserting Na ion thereto to provide the Zr-doped NaLiMO, wherein M is selected from Ti, V, Cr, Mn, Fe, Co, Ni, Mo, Ru, and combinations thereof, and wherein 0.005&#x3c;w&#x3c;0.05, 0.8&#x2264;x&#x2264;0.85, 0.09&#x2264;y&#x2264;0.11, 7&#x2264;x/y&#x2264;10, 0.7&#x2264;z&#x2264;0.95, and 1.95&#x2264;a&#x2264;2.05. When the cathode active material is used for manufacturing a cathode for a sodium ion secondary battery, the battery can substitute for a conventional, expensive lithium ion secondary battery.

Cathode active material for sodium ion battery, and preparation process thereof

According to an embodiment of the present invention, the method includes: (a) preparing a liquid cell containing a palladium precursor solution; (b) applying electron beams to the palladium precursor solution contained in the liquid cell; and (c) generating palladium hydride nanoparticles having the hcp crystal structure in the palladium precursor solution.

Palladium hydride having hcp crystal structure and preparation method thereof

A method of predicting a life of a membrane electrode assembly (MEA) of a fuel cell for electric power generation includes: deriving an operating condition for accelerated degradation, which is applicable to the fuel cell; operating the fuel cell for a specific time under the derived operating condition for accelerated degradation and under a normal operating condition, and identifying the degree of degradation of the fuel cell under each of the operating conditions; calculating an acceleration multiple based on the degree of degradation identified under the operating condition for accelerated degradation and under the normal operating condition; and predicting the life of the membrane electrode assembly based on the acceleration multiple.

Method of predicting life of membrane electrode assembly of fuel cell for electric power generation

An apparatus for discharging water of a fuel cell is provided. The apparatus includes a separation tube that has an inlet formed to face up to be connected to a fuel cell stack and has a first outlet and a second outlet to separately discharge gas and liquid. A discharge tube is connected to the first outlet formed at a lower portion of the separation tube, extends downward, and has a bending portion that bends upward at a predetermined section.

Apparatus and system for discharging water of fuel cell

Display screen or portion thereof with graphical user interface

Growing community of inventors

Seoul, South Korea

Min Kyung Cho