Synergetically integrating multiple capabilities into a nanostructured material has become one kind of reliable and sustainable strategy for resolving tricky issues in the energy and environmental fields. Herein, we prepare a series of nanochannel thin films by simply assembling cellulose nanofibers with reduced graphene oxide, dominantly driven by van der Waals interactions. The thicknesses of the as-prepared thin films can be well controlled within several micrometers. Their highly compact nanochannel structures were evidenced by the densities of up to 1.1 g cm⁻³ and the largest Brunauer–Emmett–Teller specific area of 126 m² g⁻¹, endowing them with excellent hygroscopicities (282 mg g⁻¹) and exceptional in-plane thermal conductivities (614–1238 W m⁻¹ K⁻¹ at 25–80 °C), among the highest values for carbon-based composites. Such thin-film composites are readily used for solar-steam generators, delivering an evaporation rate of 1.47 kg m⁻² h⁻¹ under 1 sun illumination, and are also easy to integrate into a high-performance amplified system for desalination on a large scale under natural solar irradiation.

中文翻译：

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高度紧凑的纳米通道薄膜，具有出色的导热性和水泵功能，可高效产生太阳能蒸汽

将多种功能协同集成到纳米结构材料中已成为解决能源和环境领域棘手问题的一种可靠且可持续的策略。在这里，我们通过简单地组装纤维素纳米纤维和减少的氧化石墨烯来制备一系列的纳米通道薄膜，而氧化石墨烯的氧化物主要由范德华相互作用驱动。所制备的薄膜的厚度可以很好地控制在几微米内。密度高达1.1 g cm ^-3和最大的Brunauer-Emmett-Teller比表面积126 m ² g ^-1证明了它们的高度紧凑的纳米通道结构，使它们具有出色的吸湿性（282 mg g ^-1）和优异的面内导热率（在25-80°C下为614-1238 W m ^-1 K ^-1），是碳基复合材料的最高值。这种薄膜复合材料很容易用于太阳能蒸汽发生器，在1次太阳照射下的蒸发速率为1.47 kg m ^-2 h ^-1，并且还易于集成到高性能放大系统中，以进行大型脱盐在自然阳光照射下的水垢。