Chen Jing, Guan Meili, Zhang Xuan, Gong Xuezhong
School of Materials and Chemical Engineering, Anhui Jianzhu University Hefei 230601 P. R. China.
Institute for Energy Research, Jiangsu University Zhenjiang 212013 P. R. China.
RSC Adv. 2019 Nov 11;9(63):36615-36620. doi: 10.1039/c9ra07483j.
Benefiting from studies into Degussa TiO, forming junctions combining different phases of a semiconductor may provide new insights into the design of efficient photocatalysts, which are a key element in current solar-driven fuel production and environmental remediation. In this work, we aimed at creating a highly efficient rutile/brookite homojunction through precise crystal phase control. Characterization of the morphology and structure revealed that the ultrafine brookite phase TiO particles were uniformly attached to the surfaces of the rod-like rutile phase, not only readily forming a homojunction but also stabilizing the brookite phase. Surprisingly, the rutile/brookite-TiO homojunction exhibited a synergetic effect, improving the photocatalytic activity for both hydrogen generation and organic dye degradation. This was attributed to the well-matched band alignment and separated reaction sites, effectively promoting the charge separation efficiency. These results highlight the potential for bifunctional photocatalyst design with separated reactive sites for simultaneous redox reactions.
受益于对德固赛二氧化钛的研究，形成结合半导体不同相的结可能为高效光催化剂的设计提供新的见解，而高效光催化剂是当前太阳能驱动的燃料生产和环境修复的关键要素。在这项工作中，我们旨在通过精确的晶相控制创建一种高效的金红石/板钛矿同质结。形态和结构表征表明，超细的板钛矿相二氧化钛颗粒均匀地附着在棒状金红石相的表面，不仅易于形成同质结，还能稳定板钛矿相。令人惊讶的是，金红石/板钛矿-二氧化钛同质结表现出协同效应，提高了产氢和有机染料降解的光催化活性。这归因于匹配良好的能带排列和分离的反应位点，有效地提高了电荷分离效率。这些结果突出了具有分离反应位点以同时进行氧化还原反应的双功能光催化剂设计的潜力。
