| 학회 |
한국화학공학회 |
| 학술대회 |
2022년 봄 (04/20 ~ 04/23, 제주국제컨벤션센터) |
| 권호 |
28권 1호, p.348 |
| 발표분야 |
[주제 7] 수소 |
| 제목 |
Highly Active PEMFC Catalyst with Enhanced Mass Transport by Controlling the Pore Diameter of Block Copolymer-Based Carbon |
| 초록 |
For the dissemination of the PEMFCs, it is crucial to reduce Pt usage, especially at the cathode. Despite much progress made within decades to increase the intrinsic activity of the Pt-based catalysts, low-loading Pt catalysts fail to show good performance in the high-current density region due to the thick catalyst layer. In this work, the block copolymer-based microparticles' pore size was tuned from 13 to 63 nm to facilitate mass transport. Ultra-low amount of Pt (1 wt%) was deposited on the carbon support to fabricate PtFe@C catalyst. The catalyst with the largest pore diameter of 63 nm yielded an initial maximum power density of 1230 mW cm-2 and 1120 mW cm-2 after 30 k cycles of accelerated degradation tests, showing excellent durability due to thin layers of carbon shell encapsulating the PtFe alloy nanoparticles. This result surpassed the performance of commercial Pt/C despite 1/20 of the Pt usage. By separating the overpotential contributions, we have concluded that the proton and oxygen mass transport resistance has improved by enlarging the pore size. This work would provide insight to prepare both highly active and durable PEMFC catalysts with minimum Pt usage. |
| 저자 |
김희은1, 이영준1, 이어윤2, 신상용1, 이준호1, 박준석1, 김범준1, 이현주1
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| 소속 |
1한국과학기술원, 2인하대 |
| 키워드 |
촉매(Catalyst) |
| E-Mail |
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| 원문파일 |
초록 보기 |
