Titanium dioxide, especially for black-colored TiO₂, has aroused increasing attention in the field of solar energy storage and conversion in recent years. Nevertheless, it is reported the fabrication of black TiO₂ normally requires a long reaction time and high temperatures, such complexity of method largely limits the fundamental understanding of black TiO₂ and development of application for solar energy conversion. In this study, black TiO₂ with tunable defects of Ti³⁺/O_v were successfully prepared from a facile method of NaN₃ deflagration, which allows an ultrafast and productive formation of defective TiO₂ at 450 ^o C. EPR spectra proved the substantial presence of Ti³⁺/O_v species in the obtained black products, which were produced during the ultrafast decomposition of NaN₃, with oxygen atoms from TiO₂ crystal seized by thermal and reductive Na clusters. Benefited from the introduction of defective Ti³⁺/O_v sites, the black sample DP-3 with modified energy band achieved an enlarged light absorption across the full solar spectrum. DP-3 demonstrated an impressive water evaporation rate of 1.624 kg m⁻² h⁻¹ and conversion efficiency of 85% under one-sun irradiation. To the best of our knowledge, the black TiO₂ act as an effective solar-thermal system was firstly reported in our work. By applying the energy-releasing effect of NaN₃, this study proposed a simple and fast way for the synthesis and modulation of TiO₂ and providing a valuable application in photothermal evaporation.

近年来，特别是用于黑色TiO _2的二氧化钛在太阳能存储和转换领域引起了越来越多的关注。然而，据报道，黑色TiO ₂的制备通常需要较长的反应时间和高温，这种方法的复杂性极大地限制了对黑色TiO ₂的基本理解以及太阳能转化应用的发展。在这项研究中，通过一种简便的NaN ₃爆燃方法成功地制备了具有可调的Ti ³⁺ / O _v缺陷的黑色TiO ₂，该方法可以在450 ^{o的温度下快速}，高效地形成缺陷TiO ₂。C. EPR光谱证明，在获得的黑色产物中大量存在Ti ³⁺ / O _v物种，这些产物是在NaN ₃超快分解过程中产生的，其中TiO ₂晶体中的氧原子被热和还原性Na团簇捕获。得益于引入有缺陷的Ti ³⁺ / O _v位，具有改进能带的黑色样品DP-3在整个太阳光谱范围内实现了更大的光吸收。DP-3表现出令人印象深刻的水蒸发速率，为1.624 kg m ^-2 h ^-1，在日光照射下的转化效率为85％。据我们所知，黑色TiO ₂在我们的工作中首次报道了作为有效的太阳热系统。通过利用NaN ₃的能量释放作用，本研究提出了一种简单，快速的TiO ₂的合成和调制方法，为光热蒸发提供了有价值的应用。