摘要
Hybrid 1T- and 2H-phase MoSe 2 nanosheets with active reaction sites, which display strong piezoelectric responses and extraordinary flexoelectric potential (flexopotential), are demonstrated. The strain-induced piezoelectric potential (piezopotential) establishes at interfacial areas between 1T and 2H-phase that modulates the local-contact characteristics to enhance charge separation. The piezo- and flexopotential coupling effect is observed not only on edge-site MoSe 2 nanosheets but also on polarized surfaces of the MoSe 2 nanosheets across the top and bottom surfaces, thus establishing an internal electric field to separate electron–hole pairs and proceeding with electrochemical reaction with polar molecules, generating hydrogen gas at ≈5000 µmol g −1 h −1 . The nanosheets assemble nanoflowers with abundant edge-sites, which serve as cantilever beams for traction force at the free ends of nanosheets. On increasing the bending moment, an extraordinary flexopotential results along the z-axis. The strain gradients induce piezo–flexoelectric coupling effects on numerous edge-site nanosheets, structural boundaries, and the polarized surface along the z-axis, which potentially facilitate a state-of-the-art catalytic hydrogen evolution reaction.