太阳能水解制氢被认为是解决能源问题的理想途径之一。InP为目前报道的太阳能转换效率最高的光电极材料，在光解水制氢领域具有重要的应用前景。但如何提高其效率、增强其稳定性和解决价带边与水的氧化电位不匹配问题，仍是当前面临的核心问题。本项目首次提出并实现一种新型多孔InP基三维双吸收体纳米异质结阵列光电极的构想。该结构利用窄带隙InP和稳定的宽带隙氧化物间的能带交错排列特征及多孔阵列的协同优势，提高InP基光电极的比表面积、光捕获性能和载流子收集能力，驱动氧化物中的光生电子向InP中迁移与其光生空穴结合，降低InP中的光生电子和氧化物的光生空穴的损失，在无偏压或较小偏压下实现高效稳定的光解水制氢。从实验和理论上揭示该光水解制氢体系中的光子吸收、电子空穴分离、输运、存活寿命和再结合的微观光电过程及调控规律，为设计构建长期稳定的、高效的太阳能水解制氢新体系提供新原理和新途径。

Hydrogen production by solar energy water splitting has been considered as one of the ideal ways to solve the energy problems. As the photoelectrode material with the highest solar energy conversion efficiency, InP shows great potential in the field of the hydrogen production by photocatalytic water splitting. However, how to improve its efficiency, enhance its stability and solve the mismatch problems between its valence band edge and the water oxidation potential are still key issues at present. We firstly propose here and realize the conception of the novel porous InP-based three-dimensional dual-absorbers nanoheterostructure photoelectrode, which takes advantage of the energy band stagger alignment characteristics between narrow band gap InP and stable wide band gap oxides and synergistic benefits of nanoporous array in order to increase specific surface area of InP-based photoelectrode, enhance light absorption, drive photogenerated electrons in oxides moving toward InP and then recombining with holes in InP and reduce the loss of photogenerated electrons in InP and photogenerated holes in oxides, thus realizing highly efficient and stable hydrogen production by solar energy water splitting under less bias or even no bias. Micro photoelectric process and the regulation mechanism of the photons absorption, electron-hole separation,transport, lifetime and recombination in the system for photolysis of water are discovered experimentally and theoretically, providing new principle and approach for designing and fabricating the novel system of long-term stability, highly efficient solar energy water splitting for hydrogen production.