Mesoporous PtPb Nanosheets as Efficient Electrocatalysts for Hydrogen Evolution and Ethanol Oxidation

Abstract

Using a one‐pot hydrothermal method with ethylenediamine, we have synthesized mesoporous PtPb nanosheets that exhibit exceptional activity in both hydrogen evolution and ethanol oxidation. The resulting PtPb nanosheets have a Pt‐enriched structure with up to 80 % atomic content of Pt. The synthetic method generated a significant mesoporous structure, formed through the dissolution of Pb species. These advanced structures enable the mesoporous PtPb nanosheets to achieve a current density of 10 mA cm−2 with an extreme low overpotential of 21 mV for hydrogen evolution under alkaline conditions. Furthermore, the mesoporous PtPb nanosheets exhibit superior catalytic activity and stability for ethanol oxidation. The highest catalytic current density of PtPb nanosheets is 5.66 times higher than that of commercial Pt/C. This research opens up new possibilities in designing mesoporous, two‐dimensional noble‐metal‐based materials for electrochemical energy conversion with excellent performance.

Self-Organized Gradually Single-Atom-Layer of Metal Osmium for an Unprecedented Hydrogen Production from Seawater

“…The HER activity of Os/GDY in 1.0 M KOH was also tested, exhibiting better catalytic activity with slightly lower overpotentials than that in alkaline simulated seawater (Figures b and S13a,b). The as-prepared Os/GDY exhibits better catalytic activity in alkaline simulated seawater than that of the recently reported ones including h-NiMoFe, m-PtPb NSs, Mo 2 C–Mo 2 N, and Ni-CeF 3 –VN (Figure c, Tables S4 and S5). Figure d shows that Os/GDY has the smallest small Tafel slope of 22 mV dec –1 , smaller than the value of 30 mV dec –1 , indicating that the Os/GDY proceeds a Volmer–Tafel mechanism for H 2 evolution with the rate-determining step (RDS) of Tafel step, and the water dissociation is significantly promoted on Os/GDY.…”

Mesoporous Mo-doped PtBi intermetallic metallene superstructures to enable the complete electrooxidation of ethylene glycol

“…1d inset), which favored mass and electron transfer and also provided unsaturated atoms and a high specific surface area, all of which should enhance their electrocatalytic properties. 23,24 Some lattice distortions (Fig. 1e) and stacking faults (Fig.…”

Recent Advances in Hydrogen Production from Hybrid Water Electrolysis through Alternative Oxidation Reactions

“…Another mesoporous two‐dimensional noble‐metal‐based catalyst also exhibits outstanding ethanol oxidation performance. Due to the high price of platinum group metals and the susceptibility of Pt‐based catalysts to induce complete oxidation of ethanol to CO 2 , [48] scholars have turned their attention to non‐noble metal catalysts. A nano‐heterostructure (NiOOH‐CuO/CF) was synthesized via a facile strategy, which can provide a 200 mA cm −2 at 1.35 V vs. RHE and selectively convert ethanol to acetic acid in an alkaline environment [49] .…”