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- 저자 : 유성종 (검색결과 193 건)
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Development of high active and stable catalysts via novel organic/inorganic hybrid technology
유성종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In Pt-transition metal (TM) alloy catalysts, the electron transfer from TM to Pt is retarded owing to the inevitable oxidation of the TM surface by oxygen. In addition, the surface TM oxide dissolution is accelerated in acidic electrolytes such as those employed in fuel cells, leading to catalyst degradation. Herein, we propose a novel synthesis strategy that selectively modifies the electronic structure of surface Co atoms with N-containing polymers, resulting in highly active and durable PtCo nanoparticle catalysts useful for oxygen reduction reaction (ORR). The proposed organic-inorganic hybrid concept will provide new insights into the tuning of nanomaterials consisting of heterogeneous metallic elements, for various electrochemical and chemical applications
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Synchrotron-based in situ x-ray absorption studies of electrocatalysts for fuel cell
유성종 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Under such circumstances, X-ray absorption spectroscopic approaches have emerged as one of the most powerful tools for understanding the surface local structure of new energy nanomaterials. This talk will focus on introducing our ongoing efforts in first principles modeling of energy conversion materials. In this talk, I will discuss the properties and performance of Pt(or Pd)-based alloy nanomaterials and composites PEMFCs and DMFCs, particularly the dissolution mechanisms of Pt(or Pd)-based alloy nanomaterials near the surface and interface, with comparisons to those in bulk Pt, as well as the surface and interface effects on the anode an cathode performance, such as oxidation/reduction reaction rate and stability.
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High performance Pt-free catalysts for anion exchange membrane fuel cells
유성종 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Anion exchange membrane fuel cells (AEMFCs) are, in principle, a viable alternative to PEMFCs and are currently garnering renewed attention. In an AEMFC, an anion exchange membrane conducts hydroxide anions during current flow, which results in several advantages. In particular, the oxygen reduction reaction (ORR) is much more facile in alkaline environments than in acidic environments. This could potentially facilitate the use of less expensive non-PGM catalysts with high stability in alkaline environments. In this talk, I will discuss the properties and performance of Pt-free nanomaterials and composites AEMFCs, particularly the ORR mechanisms of Pt-free nanomaterials near the surface and interface, with comparisons to those in bulk Pt, as well as the surface and interface effects on the anode and cathode performance, such as oxidation/reduction reaction rate and stability.
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