The realization of high-performance, precious-metal-free, stable, and robust photoanodes for water oxidation is one of the bottlenecks for dye-sensitized water splitting. Herein, we integrate an organic photosensitizer, which absorbs visible light above 500 nm, with a Prussian blue (PB) network to sensitize a visible-light-absorbing semiconductor, WO₃. Through comprehensive steady-state and ultrafast transient absorption studies, we show that the coupling of a photosensitizer to a catalyst through a short cyanide bridging group in a PB structure generates appropriate energy levels for an efficient charge transfer from the photosensitizer to the visible-light-absorbing semiconductor. The photoanode retains its structural integrity and high photoelectrochemical activity for at least 2 h of solar irradiation under mildly acidic conditions (pH 3), which reaches around 1.30 mA/cm² at 1.23 V_RHE. This work provides a simple recipe with a toolbox that can be extended to a variety of organic photosensitizers and semiconductors.

实现高性能，无贵金属，稳定且坚固的水氧化光阳极是染料敏化水分解的瓶颈之一。在这里，我们将有机光敏剂与普鲁士蓝（PB）网络集成在一起，该有机光敏剂吸收500 nm以上的可见光，以敏化可见光吸收性半导体WO ₃。通过全面的稳态和超快瞬态吸收研究，我们表明，光敏剂通过PB结构中的短氰化物桥基与催化剂的偶联产生了合适的能级，以实现从光敏剂到可见光的有效电荷转移。吸收半导体。在弱酸性条件下（pH 3），在至少1.23 V _RHE下达到约1.30 mA / cm ²的阳光照射下，光阳极至少在2 h内仍保持其结构完整性和高光电化学活性。这项工作为工具箱提供了一个简单的方法，可以扩展到各种有机光敏剂和半导体。