期刊
MATERIALS TODAY ENERGY
卷 29, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2022.101124
关键词
CO tolerant; Carbon shell; Molecular sieve effect; Durability; Hydrogen oxidation reaction; Polymer electrolyte membrane fuel cells
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2018M1A2A2061991, 2021R1A2C2012685]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20203020030010, 20173010032100]
- NRF - Ministry of Science and ICT [NRF-2020M2D8A2064728]
- BK21 FOUR Program by Chungnam National University Research Grant, 2021
- National Research Foundation of Korea [2021R1A2C2012685] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
By introducing a defect-controlled carbon molecular sieve layer, high CO tolerance and stability of PtRu catalysts can be achieved.
The CO poisoning effect leads to serious performance degradation of polymer electrolyte membrane fuel cells using reformed H2 as fuel. To address this problem, PtRu-based catalysts have been extensively studied over decades. Nevertheless, the catalyst stability issue due to Ru dissolution has always risen to the surface. Here, we propose a solution to simultaneously achieve high CO tolerance and stability of PtRu catalysts via introducing a defect-controlled carbon molecular sieve layer. The ultrathin carbon shell with controlled pore structures allows for the selective permeation of H2, providing exceptionally high CO tolerance. The molecular sieve effect is demonstrated even by Ru-free Pt nanoparticles with carbon shells. The carbon shell-encapsulated PtRu nanoparticles also show remarkably improved stability due to the protective carbon layer. This atomic-scale molecular sieve effect is expected to bring about a radical change in the design of CO tolerant catalyst structures that have been entirely dependent on metal composition.(c) 2022 Elsevier Ltd. All rights reserved.
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