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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.28 No.11 pp.633-639
DOI : https://doi.org/10.3740/MRSK.2018.28.11.633

Synthesis of Highly Dispersed Pd Nanocatalysts Through Control of Organic Ligands and Their Electrochemical Properties for Oxygen Reduction Reaction in Anion Exchange Membrane Fuel Cells

Hukwang Sung, Monika Sharma, Jeonghee Jang, Namgee Jung
Graduate School of Energy Science and Technology, Chungnam National University, Daejeon 34134, Republic of Korea
Corresponding author
E-Mail : njung@cnu.ac.kr (N. Jung, Chungnam Nat'l Univ.)

Abstract

In anion exchange membrane fuel cells, Pd nanoparticles are extensively studied as promising non-Pt catalysts due to their electronic structure similar to Pt. In this study, to fabricate Pd nanoparticles well dispersed on carbon support materials, we propose a synthetic strategy using mixed organic ligands with different chemical structures and functions. Simultaneously to control the Pd particle size and dispersion, a ligand mixture composed of oleylamine(OA) and trioctylphosphine(TOP) is utilized during thermal decomposition of Pd precursors. In the ligand mixture, OA serves mainly as a reducing agent rather than a stabilizer since TOP, which has a bulky structure, more strongly interacts with the Pd metal surface as a stabilizer compared to OA. The specific roles of OA and TOP in the Pd nanoparticle synthesis are studied according to the mixture composition, and the oxygen reduction reaction(ORR) activity and durability of highly-dispersed Pd nanocatalysts with different particles sizes are investigated. The results of this study confirm that the Pd nanocatalyst with large particles has high durability compared to the nanocatalyst with small Pd nanoparticles during the accelerated degradation tests although they initially indicated similar ORR performance.

유기 리간드 제어를 통한 고분산 팔라듐 나노 촉매의 합성 및 음이온교환막 연료전지를 위한 산소 환원 반응 특성 분석

성후광, Monika Sharma, 장정희, 정남기
충남대학교 에너지과학기술대학원

초록

 

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