Unveiling the mechanisms ruling the efficient hydrogen evolution reaction with mitrofanovite

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Unveiling the mechanisms ruling the efficient hydrogen evolution reaction with mitrofanovite

Messaggio da Marco E. Ciriotti » mar 14 set, 2021 15:00

Referenza:
▪ Boukhvalov, D.W., Cheng, J., D'Olimpio, G., Bocquet, F.C., Nung Kuo, C., Bari Sarkar, A., Ghosh, B., Vobornik, I., Fujii, J., Hsu, K., Wang, Li.M., Azulay, O., Nath Daptary, G., Naveh, D., Lue, C.S., Vorokhta, M., Agarwal, A., Zhang, L., Politano, A. (2021): Unveiling the Mechanisms Ruling the Efficient Hydrogen Evolution Reaction with Mitrofanovite Pt3Te4. Journal of Physical Chemistry Letters, 12, 8627-8636.

Abstract:
By means of electrocatalytic tests, surface-science techniques and density functional theory, we unveil the physicochemical mechanisms ruling the electrocatalytic activity of recently discovered mitrofanovite (Pt3Te4) mineral. Mitrofanovite represents a very promising electrocatalyst candidate for energy-related applications, with a reduction of costs by 47% compared to pure Pt and superior robustness to CO poisoning. We show that Pt3Te4 is a weak topological metal with the Z2 invariant, exhibiting electrical conductivity (∼4 × 10^6 S/m) comparable with pure Pt. In hydrogen evolution reaction (HER), the electrode based on bulk Pt3Te4 shows a very small overpotential of 46 mV at 10 mA cm−2 and a Tafel slope of 36−49 mV dec−1 associated with the Volmer−Heyrovsky mechanism. The negligible changes of the surface upon air exposure and electrocatalytic usage are shown experimentally and theoretically. The outstanding ambient stability of Pt3Te4 also provides durability of the electrode and long-term stability of its efficient catalytic performances.
Marco E. Ciriotti

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