4.6 Article

Atomically ordered Pt3Mn intermetallic electrocatalysts for the oxygen reduction reaction in fuel cells

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 13, Pages 7399-7408

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta00127f

Keywords

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Funding

  1. National Research Foundation of Korea (NRF) [2020R1A6A3A13073143]
  2. National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [2021M3H4A3A02086516]
  3. National Research Foundation of Korea [2021M3H4A3A02086516, 2020R1A6A3A13073143] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, structurally ordered Pt3Mn nanoparticles on a carbon support were introduced as a highly efficient and durable catalyst for the oxygen reduction reaction (ORR). The Pt3Mn intermetallic/C catalyst demonstrated superior ORR activity and stability compared to commercial Pt/C. DFT calculations and experimental results supported the high activity and stability of Pt3Mn.
Here, we introduce structurally ordered platinum-manganese nanoparticles on a carbon support (Pt3Mn intermetallic/C) as a highly efficient and durable catalyst for the oxygen reduction reaction (ORR). Using a facile method, Pt3Mn intermetallic nanoparticles were obtained without severe agglomeration. Compared to commercial Pt/C, Pt3Mn intermetallic/C demonstrates superior initial ORR activity and stability. DFT calculations demonstrated highly active and stable Pt3Mn by calculations of the oxygen adsorption energy, segregation energy, and Pt dissolution potential. One of the main challenges in the commercialization of new ORR catalysts is the successful transition from a rotating disk electrode to a single cell. At a cell voltage of 0.7 V, Pt3Mn intermetallic/C (550 -> 486 mA cm(-2), -11.63%) showed excellent initial cell performance and stability after 10k voltage cycles compared to Pt/C (419 -> 308 mA cm(-2), -26.49%). We report for the first time a Pt3Mn intermetallic ORR catalyst that achieves single-cell performance superior to that of Pt/C.

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