Abstract
A novel composite Pt-MOF was fabricated by mixing 50 wt% of Pt nanoparticles supported on Vulcan carbon and 50 wt% of a cobalt-based MOF, LEEL-037 (1,2-di(4-pyridyl)ethylene, 1,2,4,5-benzene tetracarboxylic acid, and cobalt). As a result of an increment in the OH− adsorption rate on the composite's surface, LEEL-037/Pt–C showed enhanced electrochemical activity to perform the oxygen evolution reaction (OER) compared to bare materials. The improved OH− adsorption is attributed to an electron transference from the pyridine group on LEEL-037 to Pt nanoparticles, which generates a low electronic density region on the LEEL-037 surface; thus, presenting a high affinity to adsorb OH− anions, which is the key step prior the OER in alkaline media.
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All data generated or analyzed during this study are included in this published article. Additional data are available from the corresponding author on reasonable request.
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Acknowledgments
This work was supported by the CONACYT through the following projects: Cátedras CONACYT – ID7708, CONACYT-FC-1725, and Luis. A. Alfonso-Herrera thanks CONACYT for the M.C. scholarship 844207. The UANL also supported the work through the project PAICYT CE1352-20. The authors thank Dr. Luis Gerardo Silva-Vidaurri for the XPS measurements performed in CIMAV, Monterrey.
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Alfonso-Herrera, L.A., Torres-Martínez, L.M. & Mora-Hernandez, J.M. A synergistic charge-transfer mechanism to improve the electrocatalytic oxygen evolution reaction on a novel Pt-MOF composite. MRS Advances 6, 856–861 (2021). https://doi.org/10.1557/s43580-021-00142-w
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DOI: https://doi.org/10.1557/s43580-021-00142-w