What part do the crystal defects play in the solar steam generation performance of black phosphorous (BP) nanosheets, whether good or bad? Herein, through controlling the exfoliation environment, BP nanosheets with or without crystal defects (W-BP and D-BP) are successfully fabricated and integrated into the solar steam generator with polyurethane (PU) foam. Based on transmission electron microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy technologies, crystal defects composed of phosphoric acid groups are found to be introduced into lattice structure of BP nanosheets. With simulated sunlight, the temperature variations are different in PU@collagen/D-BP (26.6 °C) and PU@collage/W-BP (20.9 °C) compared with the initial temperature. As a result, the steam generation rate of PU@collage/W-BP and PU@collage/D-BP are increased to 0.6809 kg/m²h and 0.8910 kg/m²h from 0.2594 kg/m²h (pure water). This work first reveals the inherent relationship between crystal defects and the performance of BP nanosheets based solar steam generation, providing key information for the in-depth application of BP nanosheets.

晶体缺陷在黑磷（BP）纳米片的太阳能产生性能中起什么作用，无论好坏？在此，通过控制剥离环境，成功地制造了具有或不具有晶体缺陷（W-BP和D-BP）的BP纳米片，并将其与聚氨酯（PU）泡沫一起集成到太阳能蒸汽发生器中。基于透射电子显微镜，扫描电子显微镜和X射线光电子能谱技术，发现由磷酸基组成的晶体缺陷被引入BP纳米片的晶格结构中。在模拟阳光下，PU @ collagen / D-BP（26.6°C）和PU @ collage / W-BP（20.9°C）的温度变化与初始温度相比有所不同。结果是，从0.2594 kg / m ² h（纯水）开始² h和0.8910 kg / m ² h 。这项工作首先揭示了晶体缺陷与基于BP纳米片的太阳能蒸汽发电性能之间的内在联系，为BP纳米片的深入应用提供了关键信息。