Particle-assembled photoanode films for solar water splitting are often subjected to serious electron-hole recombination, thus exhibiting low solar-to-hydrogen efficiency. The construction of efficient particle-assembled photoanode remains a challenge. Here, taking LaTaON₂ particle-assembled photoanode as a model, bulk defect control and interface engineering were introduced to reduce the electron-hole recombination. As a result, the solar photocurrent of LaTaON₂ achieves 2.1 mA cm⁻² at 1.6 V_RHE after the modification of CoO_x, an order of magnitude greater than the previously-reported value of 0.15 mA cm⁻². This dramatic enhancement is mainly ascribed to increased bulk electrical conductivity, and less back reactions on the conductive substrates, as well as facilitated hole transfer to reaction sites. This study may provide guidelines for the construction of highly efficient particle-assembled photoanode films.

用于太阳能水分解的颗粒组装的光阳极膜经常经受严重的电子-空穴复合，因此表现出低的太阳能-氢效率。有效的颗粒组装的光阳极的构造仍然是一个挑战。在此，以LaTaON ₂颗粒组装的光阳极为模型，引入体缺陷控制和界面工程以减少电子-空穴的复合。结果，在改性CoO _x之后，LaTaON ₂的太阳光电流在1.6 V _RHE时达到2.1 mA cm ^-2，比先前报道的0.15 mA cm ^-2的值大一个数量级。。这种显着的提高主要归因于整体电导率的增加，以及导电基材上较少的反反应，以及促进了空穴向反应部位的转移。这项研究可能为构建高效粒子组装的光阳极膜提供指导。