A research team led by Professor Kang Taek Lee in the Department of Energy Science and Engineering developed electrode material for a new form of high-performance Solid Oxide Fuel Cell (SOFC). Since SOFC, which generates electricity by reacting hydrogen (fuel) with oxygen in the air, emits only water after reaction, is ecofriendly, and has little restrictions in installation place, it is drawing limelight as a new and renewable energy technology that is appropriate for distributed generation . However, it has been difficult to obtain stable supply due to the rapid performance decline of electrode generating power amidst sudden stop and the suspension of fuel supply.
Professor Lee's team developed a new electrode material designed in a double perovskite structure to solve the stability of SOFC electrode. Inside the electrode material is planted with nickel (Ni), a catalyst which increases the oxidation reaction efficiency of hydrogen.
(a) Cyclic stability of the LSGM-supported symmetrical cells with the SGNM28 electrode at 750 °C versus the time of stream after 10 cycles, in which the anode gas was switched between H2 and air. (b) Cross-sectional SEM images of SGNM28 anode during a redox cycle (oxidation ? reduction ? reoxidation).
Once the fuel cell operates, nickel voluntarily transfers outside the electrode surface, generating exsolution' which forms nano metal catalyst. The exsoluted nickel catalyst helps the high-efficient oxidation reaction of fuel cell, improving the stability and performance of fuel cell at the same time.
While exsolution has recently been researched among many scientists, most research has been focusing on temporary improvement of performance in the formation of metal nano catalyst and the catalyst's oxidation reaction.
In contrast, Professor Kang Taek Lee's team focused on researching and developing a fuel cell electrode to have a stable oxidation reaction in oxidation-Redox Cycle, improving SOFC performance and advancing its technological commercialization.
Also, the research by Professor Lee's team is expected to open a new horizon for developing a new material electrode that guarantees high-performance and high-durability by proving the structural changes of reversible surface for the exsolution of nickel nano metal catalyst based on fuel cell supply.
Professor Kang Taek Lee in the Department of Energy Science and Engineering said "While the electrode of existing SOFC has excellent performance, its performance declined rapidly when the hydrogen supply became unstable, which was difficult to recover the original performance. The development of electrode that brought high performance and improved the stability of oxidation-Redox Cycle will lead the commercialization of SOFC, through the control of voluntary nano metal catalyst exsolution."
Meanwhile, this research was published online on ACS Catalysis (Impact Factor=11.384), an authoritative international journal in the catalyst field on the 2nd. Also, this research was conducted with the support of Global Frontier Project by the Ministry of Science and ICT and the Energy Professional Nurturing Project of Korea Institute of Energy Technology Evaluation and Planning.
Kyeong Joon Kim, a doctoral student in the Department of Energy Science and Engineering at DGIST and researcher Manasa K. Rath participated in the research as the co-authors, and Professor Seung-Tae Hong's team in the Department of Energy Science and Engineering at DGIST as well as Professor Jeong Woo Han's team in the Department of Chemical Engineering at POSTECH participated in this research as joint researchers.
For more information, contact:
Kang Taek LEE , Associate Professor
Department of Energy Science & Engineering
Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Kyeong Joon Kim, Manasa K. Rath, Hunho H. Kwak, Hyung Jun Kim, Jeong Woo Han, Seung-Tae Hong, and Kang Taek Lee, "A Highly Active and Redox-Stable SrGdNi0.2Mn0.8O4±δ Anode with in Situ Exsolution of Nanocatalysts", ACS Catalysis, Online Published on January 2nd, 2019.
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