Porous, Ultrathin PtAgBiTe Nanosheets for Direct Hydrazine Hydrate Fuel Cell Devices.

Ultrathin two-dimensional (2D) nanomaterials have attracted extensive attention due to their fascinating applications in sustainable and clean-energy-related devices, but obtaining ultrathin 2D multimetallic polycrystalline structures with large lateral dimensions remains a challenge. In this study, ultrathin 2D porous PtAgBiTe and PtBiTe polycrystalline nanosheets (PNSs) were obtained via a visible-light-photoinduced Bi 2 Te 3 -nanosheet-mediated route. The PtAgBiTe PNSs were assembled by sub-5 nm grains with widths beyond 700 nm. Strain and ligand effects originating from the porous, curly polycrystalline structure endowed the PtAgBiTe PNSs with robust hydrazine hydrate oxidation reaction activity. Theoretical research demonstrated that the modified Pt activated the N-H bonds in N 2 H 4 during the reaction, and strong hybridization between Pt-5d and N-2p facilitated dehydrogenation while reducing energy consumption. The peak power densities of the PtAgBiTe PNSs in actual hydrazine-O 2 /air fuel cell devices were boosted to 532.9/315.9 mW cm -2 , while those of the commercial Pt/C were 394.7/157.9 mW cm -2 . This work provides a strategy not only for preparing ultrathin multimetallic PNSs but also for finding promising electrocatalysts for actual hydrazine fuel cells. This article is protected by copyright. All rights reserved.