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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 invariant, exhibiting electrical conductivity (∼4 × 106 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 outstanding ambient stability of Pt3Te4 also provides durability of the electrode and long-term stability of its efficient catalytic …
American Chemical Society
Publication date: 
9 Sep 2021

Danil W Boukhvalov, Jia Cheng, Gianluca D’Olimpio, François C Bocquet, Chia-Nung Kuo, Anan Bari Sarkar, Barun Ghosh, Ivana Vobornik, Jun Fujii, Kuan Hsu, Li-Min Wang, Ori Azulay, Gopi Nath Daptary, Doron Naveh, Chin Shan Lue, Mykhailo Vorokhta, Amit Agarwal, Lixue Zhang, Antonio Politano

Biblio References: 
Volume: 12 Pages: 8627-8636
The journal of physical chemistry letters