Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Nanostructure Control of PtNiN/C Catalysts for Oxygen Reduction Reaction by Regulating Displacement Rate of Precursor

전구체 치환 속도 조절을 통한 산소환원반응용 PtNiN/C 촉매의 나노구조 제어

  • Dong-gun Kim (Department of Chemical Engineering, Jeonbuk National University) ;
  • Seongseop Kim (Department of Chemical Engineering, Jeonbuk National University) ;
  • Sung Jong Yoo (Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology (KIST)) ;
  • Pil Kim (Department of Chemical Engineering, Jeonbuk National University)
  • 김동건 (전북대학교 화학공학부) ;
  • 김성섭 (전북대학교 화학공학부) ;
  • 유성종 (한국과학기술연구원 연료전지 연구센터) ;
  • 김필 (전북대학교 화학공학부)
  • Received : 2024.01.22
  • Accepted : 2024.02.11
  • Published : 2024.03.31
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Abstract

Efforts are actively underway to address the issues related to the high cost of Pt-based catalysts for oxygen reduction reactions by designing high-performance Pt-based alloys through the control of their nanostructures. In this study, a method was proposed to control the nanostructure of Pt-based alloys, either hollow or core-shell, by adjusting the pH of the solution during the galvanic replacement reaction between the carbon-supported nickel-nickel nitride composite and the Pt ions. The physical characteristics, including the state, quantity, and morphology of the metal particles under different preparation conditions, were evaluated through X-ray diffraction, transmission electron microscopy, and inductively coupled plasma. When the prepared catalysts were employed for the oxygen reduction reaction, they exhibited an improvement in area specific-activity compared to a commercial Pt/C, with a 1.7 and 1.9-fold enhancement for the hollow and core-shell structured catalysts, respectively.

연료전지의 산소환원반응용 백금 촉매의 높은 비용을 극복하기 위하여 나노 구조 제어를 통한 고성능의 백금 합금 촉매 개발 연구가 활발히 수행되고 있다. 본 연구에서는 탄소에 담지된 니켈-니켈 질화물 복합체와 백금 이온 간의 갈바닉 치환 반응 시 용액의 pH 조절을 통한 촉매의 나노구조를 중공형이나 코어-쉘 구조로 제어하는 방법을 제시하였다. X선 회절 분석과 투과전자현미경, 유도결합 플라즈마를 이용한 분석을 통해 합성 조건에 따른 금속의 상태와 함량 및 합금 입자의 형상에 대한 물리적 특성 평가를 수행하였다. 제조된 촉매를 산소환원반응 촉매로 적용하였으며 상용 백금 촉매 대비 1.7배(중공형 촉매) 및 1.9배(코어-쉘 구조 촉매) 개선된 전기화학적 활성 면적 당 활성을 나타내었다.

Keywords

Acknowledgement

본 과제는 2023년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업의 결과입니다(2023RIS-008).

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