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<p>Solar steam generation (SSG) technology offers a cutting-edge strategy to crack the global freshwater crisis. However, current SSG systems continue to face bottlenecks in terms of evaporation rate, energy efficiency, freshwater yield, and stability. Here, we successfully fabricate a series of two-dimensional superlattice novel structures (labeled as T<sub><i>x</i></sub>O<sub><i>y</i></sub>-HPB-SLs) consisting of oxide clusters-heteropoly blue (T<sub><i>x</i></sub>O<sub><i>y</i></sub>-HPB) sub-nanowires (SNWs) via polyoxometalate. Structurally, the unique “inner hydrophilic-shell hydrophobic” double-layer design of T<sub><i>x</i></sub>O<sub><i>y</i></sub>-HPB achieves the enhancement of water transport efficiency and salt crystallization resistance, and the synergistic management of local heat, respectively. Moreover, the synergistic interaction between the binary components and the regular structure of T<sub><i>x</i></sub>O<sub><i>y</i></sub>-HPB also significantly strengthens the photothermal performance. Under one sun, the designed SnO<sub>2</sub>-HPB-SL hydrogel evaporator achieves an evaporation rate of 3.6 kg m<sup>−2</sup> h<sup>−1</sup> and an energy efficiency of 94.3%. The SnO<sub>2</sub>-HPB-SL hydrogel evaporator also enables the generation of high-quality fresh water in solar desalination and wastewater purification applications, while it also demonstrates the potential for long-duration (7 d) desalination. Molecular dynamics simulations also confirm that the high-performance contribution stems from the <i>in situ</i> coupling, activation and evaporation of water molecules at the HPB active site, and this molecular-scale discovery broadens our knowledge of the nature of water evaporation.</p>

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A series of two-dimensional superlattice structures designed from polyoxometalates for efficient solar steam generation

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Sihang Cheng,
  • Xiaozheng Duan,
  • Cuimei Liu,
  • Yanchun Liu,
  • Hongda Ren,
  • Zhong Zhang,
  • Xiuli Wang,
  • Huaqiao Tan,
  • Yangguang Li

摘要

Solar steam generation (SSG) technology offers a cutting-edge strategy to crack the global freshwater crisis. However, current SSG systems continue to face bottlenecks in terms of evaporation rate, energy efficiency, freshwater yield, and stability. Here, we successfully fabricate a series of two-dimensional superlattice novel structures (labeled as TxOy-HPB-SLs) consisting of oxide clusters-heteropoly blue (TxOy-HPB) sub-nanowires (SNWs) via polyoxometalate. Structurally, the unique “inner hydrophilic-shell hydrophobic” double-layer design of TxOy-HPB achieves the enhancement of water transport efficiency and salt crystallization resistance, and the synergistic management of local heat, respectively. Moreover, the synergistic interaction between the binary components and the regular structure of TxOy-HPB also significantly strengthens the photothermal performance. Under one sun, the designed SnO2-HPB-SL hydrogel evaporator achieves an evaporation rate of 3.6 kg m−2 h−1 and an energy efficiency of 94.3%. The SnO2-HPB-SL hydrogel evaporator also enables the generation of high-quality fresh water in solar desalination and wastewater purification applications, while it also demonstrates the potential for long-duration (7 d) desalination. Molecular dynamics simulations also confirm that the high-performance contribution stems from the in situ coupling, activation and evaporation of water molecules at the HPB active site, and this molecular-scale discovery broadens our knowledge of the nature of water evaporation.