Yadav Ankur, Agrahari Vivek Kumar, Pihosh Yuriy, Nakabayashi Mamiko, Nogala Wojciech, Giri Balendu Sekhar, Domen Kazunari, Pandey Daya Shankar, Gupta Bhavana, Sadhu Subha
Department of Chemistry, Institute of Science, Banaras Hindu University Varanasi India
Office of University Professors, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan.
Nanoscale Adv. 2024 Sep 2;6(22):5636-45. doi: 10.1039/d4na00479e.
Herein, we investigated the impact of polymorphism dimension control of titania nanocrystals towards hydrogen generation. Two different forms of titania nanoparticles have been synthesized following the solvothermal method, leading to the formation of two distinct physicochemical features. Detailed structural, morphological, and optical studies revealed that the formation of titania nanorods correspond to rutile while granular particles correspond to the anatase phase. Among various titania polymorphs, anatase is well known for its superior photocatalytic activity; however, to our surprise, the as-synthesized rutile nanorods exhibited higher catalytic activity in comparison to anatase spheres, and hydrogen evolution was considerably enhanced after the addition of a minute amount of Pt as the co-catalyst. Thus, despite the higher catalytic activity of anatase, the enhanced hydrogen evolution of rutile nanorods may be related to the creation of a 1D structure. Our study highlights the importance of considering not only TiO polymorphism but also shape and dimension in optimizing photocatalytic H production.
在此，我们研究了二氧化钛纳米晶体的多晶型维度控制对产氢的影响。采用溶剂热法合成了两种不同形式的二氧化钛纳米颗粒，形成了两种截然不同的物理化学特性。详细的结构、形态和光学研究表明，二氧化钛纳米棒的形成对应于金红石型，而颗粒状颗粒对应于锐钛矿相。在各种二氧化钛多晶型中，锐钛矿因其优异的光催化活性而闻名；然而，令我们惊讶的是，合成的金红石纳米棒与锐钛矿球体相比表现出更高的催化活性，并且在添加微量Pt作为助催化剂后析氢量显著增加。因此，尽管锐钛矿具有较高的催化活性，但金红石纳米棒析氢量的增加可能与一维结构的形成有关。我们的研究强调了在优化光催化产氢时不仅要考虑TiO多晶型，还要考虑形状和尺寸的重要性。
