연료전지 전극촉매용 팔라듐 나노입자 형상 제어 및 산소환원반응 성능 평가

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 29; no. 5; pp. 450 - 457
• Main Authors: 김경희(Kyoung-hee Kim), 이정돈(Jung-don Lee), 이효준(Hyojune Lee), 박석희(Seok-hee Park), 임성대(Sung-dae Yim), 정남기(Namgee Jung), 박구곤(Gu-gon Park)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2018
• Subjects: 기계공학; 코어물질; 팔라듐촉매; Shape control; 일산화탄소; Oxygen reduction reaction; 산소환원반응; Pd catalyst; 고분자전해질연료전지; 형상제어; Core material; CO; Polymer electrolyte fuel cell
• ISSN: 1738-7264; 2288-7407

To design the practical core-shell electrocatalysts, combination of core and shell materials is important to meet catalytic activity and durability target. In general, Pd is considered as a good core material due to its best activity caused by strain/ligand effect. Preparing Pd nanoparticles can be a starting point in fabricating core-shell type electrocatalysts, much simplified Pd preparing process is suggested by using carbon monoxide (CO) as a reducing agent and/or capping agent. The solvent composition and reaction temperature can control to nanosheet, tetrahedron, and sphere without using additional stabilizer. Among them, Pd nanosheet which has mainly (111) plane showed about 3 times higher electrocatalytic activity for oxygen reduction reaction (ORR) to the spherical Pd nanoparticles. The enhanced ORR activity of Pd nanosheets can be attributed to the exposure of Pd (111) surface and the high electrochemical surface area. Therefore, we demonstrated that the shape of Pd nanomaterials is easily controlled via a facile reduction method using CO, and (111) plane-oriented Pd nanosheets can be a promising ORR catalysts and core material for polymer electrolyte fuel cells (PEFCs).