Cheng Xizhe, Bai Xiaopeng, Yang Jianhua, Zhu Xiao-Ming, Wang Jianfang
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR 999077, China.
State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macao SAR 999078, China.
ACS Appl Mater Interfaces. 2022 Jun 29;14(25):28769-28780. doi: 10.1021/acsami.2c03845. Epub 2022 Jun 15.
The facile production of hollow and solid nitridized submicrometer titania spheres has been successfully realized, with potential for mass production. The nitridation process gives submicrometer titanium oxynitride spheres, which possess a strong and broadband light absorption property. Interband-transition-induced resonance and plasmon resonance have been found to coexist in titanium oxynitride spheres through single-particle dark-field scattering measurements. Theoretical modeling has further confirmed that the excellent light absorption properties of the oxynitride spheres originate from the supported dual-mode optical resonance. A highly efficient, easy-to-build, and self-sustainable device is rationally designed for solar-driven seawater desalination, where the titanium oxynitride spheres function as photothermal transducers. The hollow spheres possess a higher water evaporation rate than the solid ones as the inner surface of the hollow spheres also provides surface sites for interaction with water molecules. Given the outstanding light absorption capability and the unique morphology of the hollow spheres, a water evaporation rate of ∼1.49 kg m h with a solar-to-thermal conversion efficiency of ∼89.1% has been achieved under the illumination of simulated solar light (1 sun, 1 kW m). This marks the record performance among reported plasmon-based solar seawater desalination systems.
已成功实现空心和实心氮化亚微米级二氧化钛球的便捷生产，具有大规模生产的潜力。氮化过程得到亚微米级氮氧化钛球，其具有强烈且宽带的光吸收特性。通过单粒子暗场散射测量发现，带间跃迁诱导共振和等离子体共振在氮氧化钛球中共存。理论建模进一步证实，氮氧化钛球优异的光吸收特性源于所支持的双模光学共振。合理设计了一种高效、易于构建且自我维持的装置用于太阳能驱动的海水淡化，其中氮氧化钛球用作光热换能器。空心球的水蒸发速率高于实心球，因为空心球的内表面也为与水分子相互作用提供了表面位点。鉴于空心球出色的光吸收能力和独特的形态，在模拟太阳光（1个太阳，1 kW/m²）照射下，实现了约1.49 kg m⁻² h⁻¹的水蒸发速率和约89.1%的太阳能-热能转换效率。这标志着在已报道的基于等离子体的太阳能海水淡化系统中创下了记录性能。
