蒸发
炭黑
材料科学
光热治疗
氧气
纳米颗粒
化学工程
吸收(声学)
碳纤维
微观结构
纳米技术
化学
复合材料
热力学
有机化学
物理
工程类
天然橡胶
复合数
作者
Myeongjun Ji,Jeong Hyun Kim,Hee Yeon Jeon,Han Si,Dong Hoon Lee,Young In Lee
标识
DOI:10.1016/j.cej.2024.149435
摘要
While black TiO2-x nanoparticles (NPs) have emerged as promising photothermal materials due to exceptional light absorption properties and intrinsic stability for reliable interfacial water evaporation (IWE) system, their lower evaporation rate (0.8–1.53 kg m-2h−1) than carbon materials remains a significant challenge. This poor evaporation rate is attributed to the low photo-to-heat conversion property of black TiO2-x nanoparticles with a microstructure containing oxygen vacancies exclusively in the surface region—a consequence of the common reduction-based synthesis process. Herein, we achieved an outstanding evaporation rate of 2.12 kg m-2h−1, significantly higher than previous results under 1sun illumination due to the high-concentration bulk oxygen vacancies that promote the photo-to-heat conversion of black TiO2-x nanoparticles. Moreover, it demonstrated that black TiO2-x NPs exhibited a higher evaporation rate than carbon black, a typical carbonaceous photothermal material, under identical conditions. Furthermore, an innovative synthesis method utilizing the ultrasonic spray pyrolysis (USP) process and synthesis mechanism is proposed to introduce high-concentration bulk oxygen vacancies. This method overcomes the unavoidable drawbacks of conventional reduction-based synthesis methods, including surface-concentrated oxygen vacancies of the black TiO2-x. This work provides valuable insights into the defect engineering of metal oxides for high-performance photothermal materials.
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