Photocatalytic water splitting has been extensively studied in the past decades and numerous semiconductors have been proved to be effective photocatalysts. Among them, layered perovskites, which comprise of a large family of layered oxides with different chemical components, are promising materials because of their stable perovskite slabs consisting of multiple metal cations and flexible interlayer galleries that facilitate modification. In this paper, we systematically review a series of modified layered perovskites with enhanced performance of water splitting. A variety of methods have been extensively applied in the modification of layered perovskites. And derivate photocatalysts with higher activity, better stability and lower cost were obtained. For bulk layered perovskites, this article introduces those that have been modified via photocatalyst design（ion doping and pillaring）as well as synthesis procedure and cocatalyst loading improvement. They show optimized chemical composition, crystal structure, specific area, band energy and morphology, which have been extensively proved to be key factors that decide the performance of photocatalysts. Compared with bulk layered perovskites, layered perovskite nanosheets, normally prepared by exfoliation of corresponding bulk parent materials, show largely increased surface area, which is beneficial for charge transfer. Further modification using these nanosheets as building blocks to construct restacked layered photocatalysts with mono-component or multi-components fully utilizes their ultrathin and charged nature. The modified nanosheets display enhanced charge separation and light absorption due to designed band structure and micro-nano structure, offering a promising future direction of photocatalyst design.

在过去的几十年中，光催化水分解已被广泛研究，并且许多半导体已被证明是有效的光催化剂。其中，由许多具有不同化学成分的层状氧化物组成的层状钙钛矿是有前途的材料，因为它们的钙钛矿板稳定，由多种金属阳离子和可促进改性的柔性中间层组成。在本文中，我们系统地综述了一系列具有增强的水分解性能的改性层状钙钛矿。多种方法已广泛应用于层状钙钛矿的改性中。从而获得了具有较高活性，较好的稳定性和较低的成本的衍生光催化剂。对于散装层状钙钛矿，本文介绍了通过光催化剂设计（离子掺杂和柱撑），合成方法和助催化剂负载改进而进行了改性的那些。它们显示出优化的化学组成，晶体结构，比表面积，能带和形态，这些已被广泛证明是决定光催化剂性能的关键因素。与块状钙钛矿相比，通常通过剥离相应的块状母体材料制备的钙钛矿层状纳米片的表面积大大增加，这有利于电荷转移。使用这些纳米片作为构建基来构建具有单组分或多组分的再堆叠层状光催化剂的进一步修饰充分利用了它们的超薄和带电性质。