Interplanar Potential Difference‐Mediated Efficient Charge Separation in SrLi 2 Ti 6 O 14 Towards Optimized Photocatalytic Hydrogen Evolution

SrLi 2 Ti 6 O 14 porous microspheres (SLTO PMSs) and SrLi 2 Ti 6 O 14 /TiO 2 hollow sphere heterojunctions (SLTO/TiO 2 HSs) are fabricated via hydrothermal routes. Due to the well‐matched interfaces and strong interlayer bonding within the layered titanium‐based lithium oxide system, the interlayer potential difference created specific quantum wells contributes to the efficient separation of photogenerated charge carriers. Under AM 1.5G irradiation, a hydrogen evolution rate of 2.16 mmol h −1 g −1 is achieved by the SLTO/TiO 2 HSs heterojunction, which is approximately 3 and 154 times higher than that of SLTO PMSs (0.784 mmol h −1 g −1 ) and SLTO nanoparticles (0.014 mmol h −1 g −1 ), respectively. This enhanced photocatalytic performance can be attributed to the synergistic effects of the interfacial potential difference, porous hollow structure, oxygen vacancies, and heterogeneous structure. This material construction strategy, especially with an interlayer potential difference, provided a new idea for preparing high‐efficient photocatalytic nanomaterials.