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Atomistic understanding of hydrogen loading phenomenon into palladium cathode: A simple nanocluster approach and electrochemical evidence

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Abstract

The inherent potency of palladium to sorb hydrogen atoms was examined empirically and theoretically through various electrochemical methods and high-level quantum chemical calculations (HSE06) based on cluster model (CM) and density functional theory (DFT). The CM-DFT approach using QZVP/cc-PV6Z basis sets revealed a strong attraction between Pd nanoclusters and H atoms that generates some charged entities. This atomistically justifies why the electrochemical impedance of the system becomes less by the loading phenomenon. It is concluded that hydrogen atoms enter the palladium subsurface through hollow and bridge sites by diffusing as proton-like species and get loaded predominantly in the octahedral voids.

Inherent potency of palladium to sorb hydrogen atoms is fundamentally scrutinized. A strong attraction is witnessed and the atoms enter the metallattice through hollow and bridge sites, by diffusing as proton-like species and become loaded into octahedral voids. The impedance of PdHx matrix decreases due to generation of charged particles.

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We gratefully acknowledge the anonymous Referee and the Editor for their constructive comments on this article.

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LASHGARI, M., MATLOUBI, D. Atomistic understanding of hydrogen loading phenomenon into palladium cathode: A simple nanocluster approach and electrochemical evidence. J Chem Sci 127, 575–581 (2015). https://doi.org/10.1007/s12039-014-0764-z

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