Abstract
Recently, 2D materials have emerged in the field of light‐to‐heat conversion. However, it is urgent to find a simple and effective method to reduce the light reflectivity of the 2D surface to improve the light‐to‐heat conversion efficiency. A 2D nano‐self‐assembly material coating (NiS2@Ti3C2) realized by a simple hydrothermal method, which enables unique‐sized nano‐NiS2 crystals and 2D Ti3C2–MXenes to self‐assemble on a 3D scale, is innovatively proposed. Such a preparation method can construct a unique multilayer structure for multistage diffuse reflection of incident light, so that the MXene nanomaterial can achieve a light absorption rate of >90% in a wide spectral range. The composite is theoretically verified through optical simulation and first principles, and a higher light‐to‐heat conversion performance is achieved experimentally (61.7 °C surface equilibrium temperature, 1 sun). Compared with other similar materials, the assembled MXene seawater steam generator achieves a higher steam generation rate (1.27 kg m−2 h−1) and light‐to‐heat conversion efficiency (83.84%) under 1 sun. This material structure can maximize MXene active materials’ utilization and provide ideas for modifying other 2D photothermal materials.
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