Enhanced activity of Pd/α-MnO2 for electrocatalytic oxygen evolution reaction |
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| Authors: | Gabriel MS Salvador Ana Luisa Silva Ludmila PC Silva Fabio B Passos Nakédia MF Carvalho |
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| Affiliation: | 1. Universidade Do Estado Do Rio de Janeiro, Instituto de Química, Rua São Francisco Xavier, 524, Edifício Haroldo Lisboa da Cunha, IQ, Room 312a, Maracanã, 20550-013, Rio de Janeiro, RJ, Brazil;2. Universidade Federal Fluminense, Niterói, Departamento de Engenharia Química e de Petróleo, 24210-240, Niterói, RJ, Brazil |
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| Abstract: | This work describes the application of α-MnO2 and Pd/α-MnO2 as electrocatalysts in the oxygen evolution reaction (OER). Characterization data revealed that the Pd2+ precursor has been oxidized during the synthesis, and the resulting Pd4+ ions have unprecedently replaced the lattice framework Mn3+ ions of α-MnO2. Furthermore, formation of PdO nanoparticles was also observed. Lower OER overpotential at j = 10 mA cm?2 (636 mV) was obtained for Pd/α-MnO2 in relation to α-MnO2 (700 mV), what is in alignment with the lower charge transfer resistance of Pd/α-MnO2 (4.9 kΩ cm2) compared to α-MnO2 (10.4 kΩ cm2). Lower Tafel slope (73 mV dec?1) and higher TOF (2.87 × 10?4 s?1) at overpotential of 350 mV was obtained for Pd/α-MnO2 in relation to α-MnO2 (Tafel of 77 mV dec?1 and TOF of 1.94 × 10?4 s?1), indicating a faster electron transfer kinetics promoted by Pd. Pd/α-MnO2 was stable at j = 14 mA cm?2 for 6 h. |
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| Keywords: | Oxygen evolution reaction (OER) Manganese oxide Palladium Reflux synthesis Lattice framework substitution Water splitting |
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