Sahoo Suman Sekhar, Mansingh Sriram, Babu Pradeepta, Parida Kulamani
Centre for Nanoscience and Nanotechnology, Siksha O Anusandhan (Deemed to be University) Bhubaneswar-751030 Odisha India
Nanoscale Adv. 2021 Aug 31;3(19):5487-5524. doi: 10.1039/d1na00477h. eCollection 2021 Sep 28.
The TiO semiconductor photocatalyst is in the limelight of sustainable energy research in recent years because of its beneficial properties. However, its wide band-gap and rapid exciton recombination rate makes it a lame horse, and reduces its photocatalytic efficiency. Recently, researchers have developed facile methods for lowering the band-gap, so that it captures a wide range of solar spectrum, but the efficiency is still way behind the target value. After the discovery of black titania (B-TiO), the associated drawbacks of white TiO and its modified forms were addressed to a large extent because it not only absorbs photons in a broad spectral range (UV to IR region), but also modifies the structural and morphological features, along with the electronic properties of the material, significantly boosting the catalytic performance. Hence, B-TiO effectively converts solar energy into renewable chemical energy green fuel H that can ultimately satisfy the energy crisis and environmental pollution. However, the synthesis techniques involved are quite tedious and challenging. Hence, this review summarizes various preparation methods of B-TiO and the involved characterization techniques. It also discusses the different modification strategies adopted to improve the H evolution activity, and hopes that this review acts as a guiding tool for researchers working in this field.
近年来，TiO半导体光催化剂因其优良特性而成为可持续能源研究的焦点。然而，其宽带隙和快速的激子复合率使其表现不佳，降低了其光催化效率。最近，研究人员开发了降低带隙的简便方法，使其能够捕获更广泛的太阳光谱，但效率仍远低于目标值。黑色二氧化钛（B-TiO）被发现后，白色TiO及其改性形式的相关缺点在很大程度上得到了解决，因为它不仅能在宽光谱范围内（紫外到红外区域）吸收光子，还能显著改变材料的结构和形态特征以及电子性质，从而大大提高催化性能。因此，B-TiO能有效地将太阳能转化为可再生化学能源——绿色燃料H，最终可满足能源危机和环境污染问题。然而，所涉及的合成技术相当繁琐且具有挑战性。因此，本综述总结了B-TiO的各种制备方法及相关表征技术。还讨论了为提高析氢活性而采用的不同改性策略，并希望本综述能为该领域的研究人员提供指导。
