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<p>Developing low-energy-gap materials for efficient photothermal conversion provides promising candidates for solar energy utilization. Herein, we explore the feasibility of employing robust organic radical cations as near-unity solar absorbers for practical seawater evaporation. Gram-scale organic radical cations are straightforwardly synthesized through single-electron oxidation. The open-shell structure and intervalence charge-transfer characteristics of radicals enable near-unity absorption of full solar spectral irradiance. Femtosecond transient absorption spectroscopy reveals that the intervalence charge-transfer electron relaxes non-radiatively in femtoseconds, with a rapid rate of 5.26 × 10<sup>12 </sup>s<sup>−1</sup>. Notably, the radical cations exhibit exceptional stability, attributed to para-position protection, spin delocalization, and frontier orbital inversion. By simply soaking cellulose paper, a highly efficient interfacial evaporation system is established. Under one sunlight irradiation, the system achieves a remarkable solar-to-vapor conversion efficiency of 97.2%. This work offers new perspectives on designing robust radical systems and developing efficient photothermal conversion materials.</p>

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Robust organic radical cations with near-unity absorption across solar spectrum

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月8日

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  • Shuai Zhang,
  • Wenbin Huang,
  • Yuxin Zhu,
  • Jian Wang,
  • Feng Cao,
  • Qian Zhang,
  • Engui Zhao,
  • Zikai He

摘要

Developing low-energy-gap materials for efficient photothermal conversion provides promising candidates for solar energy utilization. Herein, we explore the feasibility of employing robust organic radical cations as near-unity solar absorbers for practical seawater evaporation. Gram-scale organic radical cations are straightforwardly synthesized through single-electron oxidation. The open-shell structure and intervalence charge-transfer characteristics of radicals enable near-unity absorption of full solar spectral irradiance. Femtosecond transient absorption spectroscopy reveals that the intervalence charge-transfer electron relaxes non-radiatively in femtoseconds, with a rapid rate of 5.26 × 1012 s−1. Notably, the radical cations exhibit exceptional stability, attributed to para-position protection, spin delocalization, and frontier orbital inversion. By simply soaking cellulose paper, a highly efficient interfacial evaporation system is established. Under one sunlight irradiation, the system achieves a remarkable solar-to-vapor conversion efficiency of 97.2%. This work offers new perspectives on designing robust radical systems and developing efficient photothermal conversion materials.