Abstract
PtM (M = S, Se, Te) dichalcogenides are promising two-dimensional materials for electronics, optoelectronics and gas sensors due to their high air stability, tunable bandgap and high carrier mobility. However, their potential as electrocatalysts for the oxygen reduction reaction (ORR) is often underestimated due to their semiconducting properties and limited surface area from van der Waals stacking. Here we show an approach for synthesizing a highly efficient and stable ORR catalyst by restructuring defective platinum diselenide (DEF-PtSe2) through electrochemical cycling in an O2-saturated electrolyte. After 42,000 cycles, DEF-PtSe2 exhibited 1.3 times higher specific activity and 2.6 times higher mass activity compared with a commercial Pt/C electrocatalyst. Even after 126,000 cycles, it maintained superior ORR performance with minimal decay. Quantum mechanical calculations using hybrid density functional theory reveal that the improved performance is due to the synergistic contributions from Pt nanoparticles and the apical active sites on the DEF-PtSe2 surface. This work highlights the potential of DEF-PtSe2 as a durable electrocatalyst for ORR, offering insights into PtM dichalcogenide electrochemistry and the design of advanced catalysts.
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The data that support the findings of this study are available in the Supplementary Information.
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Acknowledgements
B.E.K. and W.N. were financially supported by the National Science Foundation (NSF) under grant no. CHE-1800376. B.E.K. and W.N. also acknowledge the use of Princeton’s Imaging and Analysis Center, which is partially supported through the Princeton Center for Complex Materials (PCCM), an NSF-MRSEC program (DMR-2011750). F.Z. acknowledges financial support from the Simons Foundation (no. 377485) and John Templeton Foundation (no. 58851). S.P. acknowledges financial support from the Science and Engineering Research Board, under the schemes Core Research Grant (no. CRG/2021/000572); ECRA (no. ECR/2018/000255); and Council of Scientific & Industrial Research (no. 22/0883/23/EMR-II). B.E.K. and W.N. thank M. R. Smith for his helpful comments and careful proofreading of the manuscript. J.L.M.-C. acknowledges startup funds from Michigan State University. The computational and theoretical calculations presented in this work were supported in part through computational resources and services provided by the Institute for Cyber-Enabled Research at Michigan State University.
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The manuscript was written through contributions of all authors. W.N., S.P., J.L.M.-C. and B.E.K. developed the ideas and directed the experiments and theoretical calculations. W.N. and F.Z. synthesized the materials. G.C. and N.Y. conducted the STEM measurements for this work. J.L.M.-C. designed and directed the theoretical calculations. S.P. carried out most of the DFT calculations. J.L.M.-C. led the submission and resubmission efforts, coordinated responses from all authors throughout the review process, and is acknowledged for shouldering this important task with perseverance over the course of this multi-year project.
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Niu, W., Pakhira, S., Cheng, G. et al. Reaction-driven restructuring of defective PtSe2 into ultrastable catalyst for the oxygen reduction reaction. Nat. Mater. 23, 1704–1711 (2024). https://doi.org/10.1038/s41563-024-02020-w
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DOI: https://doi.org/10.1038/s41563-024-02020-w
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