Review
Chemistry, Multidisciplinary
Diana Rakhmawaty Eddy, Muhamad Diki Permana, Lintang Kumoro Sakti, Geometry Amal Nur Sheha, Solihudin, Sahrul Hidayat, Takahiro Takei, Nobuhiro Kumada, Iman Rahayu
Summary: This study aims to clarify the differences between titanium dioxide polymorphs and their properties in different photocatalytic applications. Homophase titanium dioxide has disadvantages such as high recombination rates and low adsorption capacity. On the other hand, heterophase titanium dioxide can effectively stimulate electron transfer and exhibit superior photocatalytic performance. Various biphase and triphase polymorphs of titanium dioxide are discussed, and the focus is on the synthesis and application of heterophase titanium dioxide as a photocatalyst.
Article
Chemistry, Physical
Davina Messou, Vincent Bernardin, Frederic Meunier, Marta Borges Ordono, Atsushi Urakawa, Bruno F. Machado, Vincent Colliere, Regis Philippe, Philippe Serp, Carole Le Berre
Summary: The catalytic performances of TiO2-supported Ni catalysts for the methanation of CO2 are investigated, showing that the crystalline phases of TiO2 significantly affect the activity of Ni. Mixing rutile and anatase TiO2 can increase the reaction rate significantly without direct contact between the two catalysts. The synergy between the two catalysts is attributed to hydrogen spillover mediated by surface or gas-phase species.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Pritha Biswas, Tamara D. Koledin, Skylar N. Farmer, Melissa K. Santala, Janet Tate
Summary: The transformation from amorphous to crystalline in TiO2 films in air leads to different polymorphs, which can be manipulated by introducing Sn into the system. Sn stabilizes the rutile structure at the Sn/TiO2 interfaces by scavenging oxygen, resulting in rutile formation.
CRYSTAL GROWTH & DESIGN
(2023)
Review
Chemistry, Multidisciplinary
Maela Manzoli, Francesca S. Freyria, Nicola Blangetti, Barbara Bonelli
Summary: This article reviews the advancements in the study of phase-pure brookite and brookite-containing TiO2 mixed phases, emphasizing their potential applications in photocatalysis. It is important to understand the roles of brookite-containing heterojunctions, surface properties, crystalline structure, and their influence on phase transitions for their applications in catalysis and electrochemistry.
Article
Chemistry, Multidisciplinary
Ying Feng, YongChao Zhu, Tian Chen, Pengcheng Li, Bingjie Liu, Jianfeng Cai, Wenjie Liang, Hai Xu
Summary: Weakly crystalline TiO2 with high catalytic activity was prepared using a simple green chemical oxidation reaction at low temperatures, achieving significant degradation of methylene blue and isopropyl alcohol.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Chemistry, Physical
Luis Antonio Garcia-Contreras, Jose Ocotlan Flores-Flores, Jesus Angel Arenas-Alatorre, Jose Alvaro Chavez-Carvayar
Summary: This study reports the morphological evolution and phase change of TiO2 nanobelts, as well as the synthesis of anatase, brookite, and rutile phases using different hydrochloric acid solutions. The materials were characterized using XRD, SEM, and 2D micro-Raman and infrared FT-IR spectroscopies.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Zezhu Zeng, Felix Wodaczek, Keyang Liu, Frederick Stein, Jurg Hutter, Ji Chen, Bingqing Cheng
Summary: This study reveals the distinct water adsorption and dissociation mechanisms on different pristine TiO2 surfaces, providing insights into the atomistic details of these processes using machine learning potentials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Hussein O. Badr, Francisco Lagunas, Daniel E. Autrey, Jacob Cope, Takayuki Kono, Takeshi Torita, Robert F. Klie, Yong-Jie Hu, Michel W. Barsoum
Summary: We synthesized 1D TiO2-based nanofilaments by reacting Ti-containing precursors with quaternary ammonium hydroxides at near-ambient conditions. The structure was previously believed to be anatase-based, but we now conclude that it is actually a 1D titania lepidocrocite-based structure. The NFs grow along [100] and tend to self-assemble/stack in two directions. The band gap is not affected by the nature of the cations surrounding the NFs.
Article
Chemistry, Physical
Min Chen, Jianhua Chen, Chuncheng Chen, Changbin Zhang, Hong He
Summary: The research shows that CuOx-rutile is more suitable for the oxidation of ammonia gas under visible light compared to CuOx-anatase, contrary to previous beliefs. Further analysis revealed that the interaction between CuOx and TiO2 differs significantly in different crystal phases, resulting in distinct directions of charge transfer.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
W. A. Chapa Pamodani Wanniarachchi, Thevakaran Arunasalam, Punniamoorthy Ravirajan, Dhayalan Velauthapillai, Ponniah Vajeeston
Summary: TiO2 is a highly effective heterogeneous photocatalyst due to its stability, low cost, non-toxicity, and strong oxidizing power. However, to increase its utilization of sunlight, doping of metals and nonmetals into pure TiO2 is implemented. In this study, we incorporated Zr, Si, V, W, Ge, Cr, Sn, Mo, and Pb dopants into the TiO2 lattice and studied their optoelectronic properties using the Vienna ab initio Simulation Package (VASP). We observed that V, Mo, and Cr doping introduced shallow impurity states within the band gap, enhancing the photocatalytic efficiency. W doping reduced the band gap of anatase TiO2 without introducing any impurity states, shifting the absorption edge of the solar spectrum towards lower photon energy.
Article
Chemistry, Multidisciplinary
Min Gu Kim, Ji Eun Lee, Kang Seok Kim, Jeong Min Kang, Jeong Hoon Lee, Kwang Ho Kim, Min Cho, Seung Geol Lee
Summary: The mixed-phase brookite-rutile TiO2 nanoparticles were synthesized using different concentrations of nitric acid, and their photocatalytic activity and photoelectrochemical properties were studied. The results demonstrated that the mixed-phase nanoparticles exhibited excellent performance.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
A. Sivakumar, S. Kalaiarasi, S. Sahaya Jude Dhas, Abdulrahman I. Almansour, Raju Suresh Kumar, Natarajan Arumugam, S. A. Martin Britto Dhas
Summary: In accordance with the current trend in science and technology, strategic sectors focusing on innovative materials development heavily rely on materials science researchers to meet industrial efficiency and stability requirements. The search for potential materials to fulfill these requirements is an ongoing process, with a recent investigation demonstrating brookite TiO2 as a highly shock-resistant material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Applied
Nhan V. Nguyen, Nam Nguyen, Jason R. Hattrick-Simpers, Oleg A. Kirillov, Martin L. Green
Summary: Transparent conducting oxides have high optical transmittance and are electrically conductive, with differences in optical responses between materials such as TiO2, ZnO, and SnO2. The bandgap and electronic characteristics were determined and discussed in this study.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Ceramics
Xiaoping Wu, Yong Liu
Summary: The transformation of anatase titanium dioxide to rutile form is influenced by factors such as heating temperature, heating time, and particle states. The roles of temperature and time in the anatase-rutile transformation for pigmentary TiO2 production are not clearly understood.
CERAMICS INTERNATIONAL
(2023)
Article
Polymer Science
Tinoco Navarro Lizeth Katherine, Bednarikova Vendula, Kastyl Jaroslav, Cihlar Jaroslav
Summary: TiO2 aerogels doped with Ni, Co, Cu, and Fe were studied for their structure and photocatalytic activity in the decomposition of acid orange (AO7). The doped aerogels were evaluated and analyzed after calcination at 500°C and 900°C. XRD analysis showed the presence of anatase/brookite and rutile phases, along with other oxide phases from the dopants. SEM and TEM microscopy revealed the nanostructure of the aerogels, and BET analysis showed their mesoporosity and high specific surface area. Photocatalytic activity was assessed using UV spectrophotometry and photodegredation of AO7, with Ni-TiO2 and Cu-TiO2 aerogels calcined at 500°C exhibiting higher photoactivity coefficients than those calcined at 900°C.
Article
Biochemistry & Molecular Biology
Aleksei O. Murzin, Anna Yu. Samsonova, Constantinos C. Stoumpos, Nikita I. Selivanov, Alexei V. Emeline, Yury V. Kapitonov
Summary: Halide perovskites and their low-dimensional analogs are promising semiconductor materials for various photonics applications. This paper proposes a method using diluted diffuse reflectance spectroscopy to obtain the full-range absorption spectrum from halide perovskite powders, and demonstrates its practical importance.
Article
Materials Science, Multidisciplinary
Mariia P. Mamaeva, Maksim S. Lozhkin, Anna V. Shurukhina, Boris V. Stroganov, Alexei V. Emeline, Yury V. Kapitonov
Summary: This paper demonstrates the possibility of using resonant excitons to create resonant diffraction gratings, and achieves spatial modulation of excitonic properties by ion irradiation. This method features low radiation dose, high efficiency, and narrow spectral width, making it widely applicable in the field of information photonics.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Energy & Fuels
Detlef Bahnemann, Peter Robertson, Chuanyi Wang, Wonyong Choi, Helen Daly, Mohtaram Danish, Hugo de Lasa, Salvador Escobedo, Christopher Hardacre, Tae Hwa Jeon, Bupmo Kim, Horst Kisch, Wei Li, Mingce Long, M. Muneer, Nathan Skillen, Jingzheng Zhang
Summary: As nations transition towards low or net zero carbon economies due to global climate change, the need for practical alternative fuels is urgent. Hydrogen gas is considered one of the most desirable substitutes for traditional hydrocarbons, but obtaining "green" hydrogen from low or zero carbon footprint sources presents challenges. Research focuses on practical techniques for producing "green" hydrogen through photocatalytic or photoelectrocatalytic processes. However, the capability of this technology to produce hydrogen at scale has faced significant issues. This road map article explores various aspects of photocatalytic and photoelectrocatalytic hydrogen generation, including processes, materials science, reactor engineering, and biomass reforming applications.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Reshalaiti Hailili, Xiaokaiti Reyimu, Zelong Li, Xu Lu, Detlef W. Bahnemann
Summary: Effective removal of dilute nitrogen oxide (NO, ppb) without NO2 emission is still challenging in environmental pollution control. The construction of photocatalysts with diversified microstructures and atomic arrangements has been found to promote NO adsorption, activation, and complete removal without secondary pollution. In this study, the microstructure of ZnO photocatalysts was regulated by altering the reaction temperature and alkalinity, resulting in enhanced NO removal and reduced NO2 yields through defect-related surface-interface aspects. Mechanistic exploitations revealed that regulated microstructures, defect-related charge carrier separation, and strengthened surface interactions contributed to improved NO removal and simultaneous avoidance of NO2 formation. This investigation sheds light on the facile regulation of microstructures and the roles of surface chemistry in the oxidation of low concentration NO in the ppb level upon light illumination.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Muhammad Kamran, Tarek A. Kandiel, Safwat Abdel-Azeim, Mohamed A. Morsy, Detlef W. Bahnemann
Summary: This article explores TiO2 nanomaterials as promising photocatalysts for NOx depollution from air under sunlight irradiation. Experimental results show that brookite TiO2 exhibits comparable photocatalytic activity to benchmark TiO2 P25 and higher selectivity towards the conversion of NOx into nitrate ions. The enhanced selectivity is attributed to the higher density of defects on brookite TiO2 surfaces, which facilitates the adsorption of NO2 while favoring the dissociative adsorption of water.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Kirill M. M. Bulanin, Alexei V. V. Emeline, Ruslan V. V. Mikhaylov, Alena Y. Y. Mikheleva, Aida V. V. Rudakova, Vladimir K. K. Ryabchuk
Summary: In this research, the UV-stimulated processes in the TiO2-COg system were studied using in situ FTIR spectroscopy and photoelectron spectroscopy. The kinetic dependences of the adsorbed CO intensity and background absorption, as well as the positions of the Fermi level in TiO2, were analyzed and compared before, during, and after UV irradiation. The reversible shift in the adsorption-desorption equilibrium was explained by changes in the electronic state of the photocatalyst under UV irradiation. The proposed mechanism of photostimulated CO adsorption and re-adsorption in the TiO2-COg system is described in detail, including the formation of strongly bound surface carbonates caused by the side reaction of CO photooxidation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jing Ma, Yang Tang, Gui Lu, Yu Wang, Wenke Niu, Dong Fu, Kai Zhang, Detlef W. Bahnemann, Jia Hong Pan
Summary: A PVDF/CB/TiO2 conductive membrane was fabricated through the hybridization of PVDF, mesoporous TiO2 spheres (MTS), and carbon black (CB). The membrane showed a highly porous structure and excellent photoelectrocatalytic (PEC) properties, achieving a high decolorization rate of methylene blue (MB) in a continuous cross-flow filtration process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Anna Yu. Samsonova, Irina V. Krauklis, Yuri V. Chizhov, Nikita I. Selivanov, Alexei V. Emeline, Yury V. Kapitonov
Summary: In this study, polarized Raman spectroscopy was used to investigate the internal vibrations of the 3-cyanopyridinium cation in the halide post-perovskite (3cp)PbBr3 crystal. The vibrational frequencies and intensities of the Raman signal were calculated for a single cation using density functional theory. Selection rules for cation vibrations in the crystal were established and used to identify the internal vibrations of the cation in the Raman spectrum. Narrow and isolated internal cation vibrations can serve as indicators of the crystalline environment.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Haoran Wang, Reshalaiti Hailili, Xiaoyu Jiang, Guoliang Yuan, Detlef W. Bahnemann, Xiong Wang
Summary: The successful construction of heterojunction facilitates the improvement of solar light utilization efficiency. In this study, visible-light-driven AgBr was deposited on the surface of lamellar BiVO4 to enhance charge carrier separation and photocatalytic effectiveness. The catalyst with an optimal AgBr/BiVO4 ratio exhibited significantly enhanced decolorization ability and high stability. The S-scheme carrier migration mechanism was investigated, revealing the effective charge carrier separation/transfer and the excellent photocatalytic performance.
Article
Chemistry, Multidisciplinary
Jakob Schlenkrich, Franziska Luebkemann-Warwas, Rebecca T. Graf, Christoph Wesemann, Larissa Schoske, Marina Rosebrock, Karen D. J. Hindricks, Peter Behrens, Detlef W. Bahnemann, Dirk Dorfs, Nadja C. Bigall
Summary: Destabilizing ligand-stabilized semiconductor nanocrystal solutions results in the formation of macroporous self-supporting nanocrystal networks called hydrogels, which have high surface accessibility. The delocalization of charge carriers in these gels extends their mobility and enhances photocatalytic reactions. Recent advances in colloid chemistry enable the synthesis of nanocrystals with specific physicochemical properties, which, when combined with nanocrystal-based hydrogels, can lead to novel materials with optimized photocatalytic properties. This study demonstrates that CdSe quantum dots, CdS nanorods, and CdSe/CdS dot-in-rod-shaped nanorods as nanocrystal-based hydrogels show significantly higher hydrogen production rates compared to their ligand-stabilized nanocrystal solutions. The gel synthesis through controlled destabilization by ligand oxidation ensures high surface-to-volume ratio, facilitates photocatalytic hydrogen production without a co-catalyst, and overcomes colloidal instability issues in photocatalysis. X-ray photoelectron spectroscopy and photoelectrochemical measurements confirm the advantageous properties of these 3D networks for photocatalytic hydrogen production.
Editorial Material
Chemistry, Physical
Kangwoo Cho, Wonyong Choi, Detlef Bahnemann
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Editorial Material
Chemistry, Physical
Kangwoo Cho, Wonyong Choi, Detlef Bahnemann
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Anna Yu. Samsonova, Irina V. Krauklis, Yuri V. Chizhov, Nikita I. Selivanov, Alexei V. Emeline, Yury V. Kapitonov
Summary: In this work, polarized Raman spectroscopy is used to study the internal vibrations of the 3-cyanopyridinium cation in the halide post-perovskite (3cp)PbBr3. Vibrational frequencies and intensities of a single cation are calculated using density functional theory, and selection rules for cation vibrations in the crystal are established. These rules, along with modeling results, are used to identify the internal vibrations of the cation in the Raman spectrum of the crystal. Narrow and isolated internal vibrations of cations can be used as spectators of the crystalline environment.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Environmental
Haitao Ren, Fan Qi, Abdelkader Labidi, Ahmed A. Allam, Jamaan S. Ajarem, Detlef W. Bahnemann, Chuanyi Wang
Summary: In this study, carbon quantum dots (CQDs) with excellent fluorescence properties were prepared from apple leaf waste and used as a fluorescent probe for the detection of Fe3+ in aqueous environments. The CQDs exhibited high fluorescence stability, specific recognition ability for Fe3+, and recyclability.
ACS ES&T ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Si-Ming Wu, Yi-Tian Wang, Shi-Tian Xiao, Yan-Xiang Zhang, Ge Tian, Jiang-Bo Chen, Xiao-Fang Zhao, Christoph Janiak, Menny Shalom, Detlef W. Bahnemann, Li-Ying Wang, Xiao-Yu Yang
Summary: Directed transfer of carriers in semiconductors by structural design is challenging but important. In this study, TiO2 nanosheets with interlayered sp(2) carbon and titanium vacancies were obtained, and the directed transfer of carriers from the excited position to Ti-vacancies to interlayered carbon was observed. This greatly increased the charge transport efficiency and resulted in excellent photocatalytic and photoelectrochemical activity, as well as significant lithium/sodium ion storage performance. Theoretical calculations further revealed the mechanism of spatial inside-out cascade electron transfer.
