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Amino-tethering synthesis strategy toward highly accessible sub-3-nm L10-PtM catalysts for high-power fuel cells

2023; Elsevier BV; Volume: 6; Issue: 3 Linguagem: Inglês

10.1016/j.matt.2022.12.011

2590-2393

Qing Gong, Hong Zhang, Haoran Yu, Sungho Jeon, Yang Ren, Zhenzhen Yang, Chengjun Sun, Eric A. Stach, Alexandre C. Foucher, Yikang Yu, Matthew Smart, Gabriel M. Filippelli, David A. Cullen, Ping Liu, Jian Xie,

Catalysis and Hydrodesulfurization Studies

Summary Because of the poor accessibility of embedded active sites, platinum (Pt)-based electrocatalysts suffer from insufficient Pt utilization and mass transport in membrane electrode assemblies (MEAs), limiting their performance in polymer electrolyte membrane fuel cells. Here, we report a simple and universal approach to depositing sub-3-nm L1 0 -PtM nanoparticles over external surfaces of carbon supports through pore-tailored amino (NH 2 )-modification, which enables not only excellent activity for the oxygen reduction reaction, but also enhanced Pt utilization and mass transport in MEAs. Using a low loading of 0.10 mg Pt ·cm −2 , the MEA of PtCo/KB-NH 2 delivered an excellent mass activity of 0.691 A·mg Pt −1 , a record-high power density of 0.96 W·cm −2 at 0.67 V, and only a 30-mV drop at 0.80 A·cm −2 after 30,000 voltage cycles, which meets nearly all targets set by the Department of Energy. This work provides an efficient strategy for designing advanced Pt-based electrocatalysts and realizing high-power fuel cells.