[논문]Sonochemical gram-scale synthesis of core–shell PdCoPt nanoparticle and investigation of post heat-treatment effect for various gas atmospheres

Lim, Iksung; Lee, Eunjik; Park, Hyun-Uk; Jang, Jeongyun; Jung, Namgee; Yang, Tae-Hyun; Yim, Sung-Dae; Park, Gu-Gon

doi:10.1016/j.jallcom.2021.160441

[해외논문] Sonochemical gram-scale synthesis of core–shell PdCoPt nanoparticle and investigation of post heat-treatment effect for various gas atmospheres 원문보기

Journal of alloys and compounds, v.879, 2021년, pp.160441 -

Lim, Iksung (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Lee, Eunjik (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Park, Hyun-Uk (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Jang, Jeongyun (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Jung, Namgee (Graduate School of Energy Science and Technology (GEST), Chungnam National University) , Yang, Tae-Hyun (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Yim, Sung-Dae (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER)) , Park, Gu-Gon (Fuel Cell Laboratory, Korea Institute of Energy Research (KIER))

Abstract ▼ AI-Helper

Abstract For the commercialization of polymer electrolyte fuel cells (PEFCs), the development of highly active and durable electrocatalysts is essential to improve the sluggish oxygen reduction reaction (ORR) and reduce the usage of precious group metals (Pt and Pd) in the catalyst layer of the membrane electrode assembly (MEA). Core–shell structured nanoparticles (NPs) have garnered significant attention because their unique structure enables the maximization of Pt utilization and catalytic performance. Moreover, ternary Pt-based core–shell electrocatalysts are being actively investigated for securing additional activity and durability in ORR. Herein, we report the sonochemical preparation of ternary PdCo@Pt NPs up to 10.0 g per batch and post-heat treatment effects based on the gas atmosphere. Based on the difference in reactivity of metal β-ketonate precursors under ultrasound irradiation, a core–shell structure with a Pt skin layer is formed and the as-prepared PdCo@Pt sample is post heat-treated under various gas atmospheres (N2, H2/N2, and NH3/N2) to compare the catalytic activity and durability of ORR. The structural characterization of the heat-treated PdCo@Pt samples reveals that the gas atmosphere during heat treatment controls the particle size, the degree of alloying and the Pt shell thickness. In addition, electrochemical studies show that heat-treated PdCo@Pt samples under a reducing atmosphere (H2/N2, NH3/N2) exhibit higher ORR activity and better durability than those heat-treated under an inert atmosphere (N2). We demonstrated that the use of ultrasound enables mass production of core-shell NPs, and gas induced segregation under post heat-treatment help to control the structure of appropriate electrocatalyst for PEFCs. Highlights We use ultrasound to synthesize of PdCo@Pt nanoparticles up to 10 g per batch. Effect of post heat-treatment of PdCo@Pt was investigated under varied gas conditions. Heat-treated PdCo@Pt samples shows improved ORR activity and durability. Heat-treated PdCo@Pt samples under H2 atmosphere shows highest durability.

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[해외논문] Sonochemical gram-scale synthesis of core–shell PdCoPt nanoparticle and investigation of post heat-treatment effect for various gas atmospheres 원문보기

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[해외논문] Sonochemical gram-scale synthesis of core–shell PdCoPt nanoparticle and investigation of post heat-treatment effect for various gas atmospheres 원문보기

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