Low temperature synthesis of new highly graphitized N-doped carbon for Pt fuel cell supports, satisfying DOE 2025 durability standards for both catalyst and support
SCIE
SCOPUS
- Title
- Low temperature synthesis of new highly graphitized N-doped carbon for Pt fuel cell supports, satisfying DOE 2025 durability standards for both catalyst and support
- Authors
- Lee, Ha-Young; Yu, Ted H.; Shin, Cheol-Hwan; Fortunelli, Alessandro; Ji, Sang Gu; Kim, Yujin; Kang, Tong-Hyun; Lee, Byong-June; Merinov, Boris V.; Goddard, William A.; Choi, Chang Hyuck; Yu, Jong-Sung
- Date Issued
- 2023-04
- Publisher
- Elsevier BV
- Abstract
- For polymer electrolyte membrane fuel cells (PEMFCs), the state-of-the-art electrocatalysts are based on carbon-supported Pt group metals. However, current carbon supports suffer from carbon corrosion during repeated start-stop operations, causing performance degradation. We report a new strategy to produce highly graphitized carbon with controllable N-doping that uses low-temperature synthesis (650 ℃) from g-C3N4 carbon-nitrogen precursor with pyrolysis using Mg. The high graphiticity is confirmed by high-intensity 2D Raman peak with low ID/IG (0.57), pronounced graphitic XRD planes, and excellent conductivity. Without further post-treatment, this highly graphitized N-doped carbon (HGNC) material combines high pyrrolic-N content with high porosity. Supporting Pt on HGNC exhibits excellent oxygen reduction activity for PEMFC with greatly improved durability as proved by real-time loss measurements of Pt and carbon, the first to surpass the DOE 2025 durability targets for both catalyst and support. The Pt/HGNC-65 shows 32% and 24% drop in mass activity after accelerated durability tests of both electrocatalyst and support, respectively, which are less than DOE target of 40% loss. The atomistic basis for this durability is explained via quantum mechanics-based molecular dynamics simulations. Interestingly, it is found that pyrrolic-N strongly interacts with Pt, making the Pt catalyst more stable during fuel cell reaction.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/114591
- DOI
- 10.1016/j.apcatb.2022.122179
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- Applied Catalysis B: Environmental, vol. 323, page. 122179, 2023-04
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- There are no files associated with this item.
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