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Layer Orientation-Engineered Two-Dimensional Platinum Ditelluride for High-Performance Direct Alcohol Fuel Cells

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journal contribution
posted on 09.09.2021, 16:04 by Jinfa Chang, Tae-Jun Ko, Minyeong Je, Hee-Suk Chung, Sang Sub Han, Mashiyat Sumaiya Shawkat, Mengjing Wang, Sang Jin Park, Seung Min Yu, Tae-Sung Bae, Myoung-Woon Moon, Kyu Hwan Oh, Heechae Choi, Yang Yang, Yeonwoong Jung
Platinum (Pt) has been considered the best catalyst for oxygen reduction reaction (ORR) based-direct liquid fuel cells (DLFCs). However, its high cost and the mixed potential issue have been obstacles for commercialization. Herein, we report a new Pt-based catalyst of two-dimensionally layered platinum ditelluride (2D PtTe2) with mixed layer orientation, termed M-PtTe2. This material constitutes vertically- and horizontally aligned 2D PtTe2 layers, which synergistically boost the ORR reaction; the former promotes O2 adsorption and electron transfer, while the latter boosts O–O bond breaking and O–H bond coupling. The M-PtTe2 synthesized on nanostructured carbon papers significantly surpasses the ORR performances of commercial Pt/C, yielding 2.4-times higher mass activity in half-cell and 2-times higher maximum power density in actual devices. Furthermore, it exhibits extremely low alcohol adsorption energies, unveiling unprecedented suitability for alcohol-tolerant DLFCs. This new understanding of the role of the 2D layer orientation in ORR kinetics and thermodynamics suggests useful catalyst design principles.