Hybrid 1T‐ and 2H‐phase MoSe₂ 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 MoSe₂ nanosheets but also on polarized surfaces of the MoSe₂ 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.

中文翻译：

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压电-柔性催化氢逸出与1T和2H相混合少层MoSe2纳米片的耦合效应

展示了具有活跃反应位点的混合1T和2H相MoSe ₂纳米片，这些纳米片具有强大的压电响应和非凡的柔电势（flexopotential）。应变诱发的压电势（压电势）建立在1T和2H相之间的界面区域，该区域调节局部接触特性以增强电荷分离。压电和柔势耦合效应不仅在边缘位置的MoSe ₂纳米片上观察到，而且在横跨顶部和底部表面的MoSe ₂纳米片的极化表面上观察到，因此建立了一个内部电场来分离电子-空穴对并继续进行与极性分子发生电化学反应，产生≈5000µmol g的氢气^-1小时^-1。纳米片组装具有丰富边缘位置的纳米花，这些纳米花充当悬臂梁以在纳米片的自由端产生牵引力。随着弯矩的增加，沿z轴会产生非常大的柔势。应变梯度在沿z轴的许多边缘位纳米片，结构边界和极化表面上引起压电-柔电耦合效应，这有可能促进最先进的催化氢释放反应。