Ultrathin Carbon Shell-Coated Intermetallic Alloy Nanoparticles for Oxygen Reduction Reaction in Fuel Cells

Hyeonwoo Choi; Keonwoo Ko; Yoonseong Choi; Jiho Min; Yunjin Kim; Sourabh Sunil Chougule; Khikmatulla Davletbaev; Chavan Abhishek Arjun; Beomjun Pak; Namgee Jung

doi:10.3740/MRSK.2024.34.4.208

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2024 Vol.34, Issue 4 Preview Page Next Page

Research Paper

Ultrathin Carbon Shell-Coated Intermetallic Alloy Nanoparticles for Oxygen Reduction Reaction in Fuel Cells 초박형 카본쉘이 코팅된 금속간 화합물 합금 나노 입자로 구성된 연료전지용 산소 환원 반응 촉매

27 April 2024. pp. 208-214

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Abstract

To fabricate intermetallic nanoparticles with high oxygen reduction reaction activity, a high-temperature heat treatment of 700 to 1,000 °C is required. This heat treatment provides energy sufficient to induce an atomic rearrangement inside the alloy nanoparticles, increasing the mobility of particles, making them structurally unstable and causing a sintering phenomenon where they agglomerate together naturally. These problems cannot be avoided using a typical heat treatment process that only controls the gas atmosphere and temperature. In this study, as a strategy to overcome the limitations of the existing heat treatment process for the fabrication of intermetallic nanoparticles, we propose an interesting approach, to design a catalyst material structure for heat treatment rather than the process itself. In particular, we introduce a technology that first creates an intermetallic compound structure through a primary high-temperature heat treatment using random alloy particles coated with a carbon shell, and then establishes catalytic active sites by etching the carbon shell using a secondary heat treatment process. By using a carbon shell as a template, nanoparticles with an intermetallic structure can be kept very small while effectively controlling the catalytically active area, thereby creating an optimal alloy catalyst structure for fuel cells.

Keywords

intermetallic

carbon shell

heat treatment

oxygen reduction reaction

proton exchange membrane fuel cell

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 34
No :4
Pages :208-214
Received Date : 2024-02-23
Revised Date : 2024-04-06
Accepted Date : 2024-04-09
DOI :https://doi.org/10.3740/MRSK.2024.34.4.208

Korean Journal of Materials ResearchISSN:1225-0562(Print) 2287-7258(Online)한국재료학회

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