Piezo‐Activated Metal‐Free Donor‐Acceptor Photocatalytic Overall Water Splitting System Toward Highly‐Efficient Simultaneous H 2 and H 2 O 2 Production

, respectively) better than the performances in literatures. Effective separation of photo-generated carriers achieved by piezo-induced built-in electric field and hydrazone bond-based electron transfer channel, and low energy barriers of water splitting in the presence of hydrazone bond linkage, collectively contributed to the outstanding photo/piezo-catalytic OWS performance of HFPTP-Bpy-Hz. Furthermore, the hydrazone bond-based positive correlation between the polarity of the polymer backbone and piezo/photocatalytic activity at the molecular level was clearly demonstrated through targeted regulation of connecting bonds and building blocks. This work offers valuable insights for constructing the promising solar light-driven OWS systems using photocatalysts with unsuitable band structures.