JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Tianwei Zhao,Gang Cheng,Wuxia Zhang,Jinyan Xiong
Hollow-structured TiO 2 is promising for photocatalytic CO 2 reduction due to its high surface area and light absorption. This study aims to enhance its photocatalytic activity through the engineering of Cu and CuAg alloy cocatalysts. Hollow TiO 2 was synthesized by a hard template method, followed by Cu loading and CuAg alloy formation via a chemical replacement reaction. The optimal 7 % Cu loading achieved the highest CH 4 yield of 2.47 μmol g −1 h −1 among the TiO 2 -Cu composites. Introducing Ag further enhanced the performance, with the Cu:Ag = 9:1 alloy boosting the CH 4 yield to 6.72 μmol g −1 h −1 , approximately 14 times that of pure TiO 2 . Characterization techniques such as XRD, SEM, and XPS were also employed to analyze the phase composition, microstructure, and photoelectrochemical properties of the synthesized materials. The experimental findings indicate that the introduction of the CuAg alloy significantly promotes charge separation and transfer efficiency, and increases the effective active sites on the TiO 2 surface, thereby greatly enhancing the efficiency of the photocatalytic reaction. These findings offer insights into the design of efficient photocatalytic materials for sustainable energy applications.
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CELLULOSE
·
2025
·
IF 4.8
Zhang Yujie,Li Liangsheng,Huang Jianxi,He Xinru,Xuan Xuan,Shi Wenming,Yu Yongsheng,Chen Heng
Transparency is an important characteristic for film products, yet it remains a formidable challenge in the realm of organic-inorganic hybrid and composite materials. Herein, we report the development of transparent TiO 2 /cellulose hybrid films through an innovative in situ synthesis method, integrating TiO 2 formation during the regeneration process of cellulose. These hybrid films exhibit exceptional transparency, rivaling that of pure regenerated cellulose films, while simultaneously boasting a robust UV-shielding capacity. The successful integration of TiO 2 into the hybrid films was validated through XPS and Raman analysis, while XRD patterns revealed a decrease in the crystallinity of regenerated cellulose due to the introduction of TiO 2 . To investigate the dye removal capabilities of these films, methylene blue was chosen as a model dye. Our experiments indicate that the incorporation of TiO 2 significantly enhances the dye absorption capacity and catalytic photodegradation activity of the regenerated cellulose film. Furthermore, antibacterial tests targeting Escherichia coli and Staphylococcus aureus revealed that these hybrid films exhibit remarkable antibacterial properties, effectively inhibiting bacterial growth in both dark and UVC irradiation conditions. Collectively, these results underscore the promising applications of TiO 2 /cellulose hybrid films in diverse fields, including dye wastewater treatment and active food packaging. Graphical abstract
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Nanoscale
·
2024
·Vol. 16
·期 27
·12992-12999
·
IF 5.8
Huiling Zhu,Xiangran Xu,Yongchao Wang,Jian Ding,Xinru Yu,Xiaoyi Liu,Zhaowu Zeng,Huan Wang,Zhen Li,Yang Wang
The photocatalytic conversion of nitrogen into high-value ammonia products holds tremendous potential in the global nitrogen cycle. However, the activation of N2 and competition of hydrogen evolution limit the improvement of nitrogen fixation performance. In this study, we developed a fluorinated TiO2 (F-TiO2) using a hydrothermal-annealing method. The incorporation of F dopants not only enhances the adsorption and activation of N2 through electronic structure regulation, but also facilitates an in situ increase in active sites via the electron repulsion effect between F and Ti atoms. In addition, the presence of F on the surface effectively improved the nitrogen supply problem and optimized the nitrogen fixation selectivity for its hydrophobic modulation. The NH3 yield of the F-TiO2 photocatalyst reached 63.8 μmol h−1 g−1, which was 8.5 times higher than that of pure TiO2. And the selectivity experiment showed that the electronic ratio of NH3 to H2 production reached 0.890. This research offers valuable insights for the design of highly efficient and selective nitrogen-fixing photocatalysts.
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PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Zewei Huang,Yingjie Wang,Meiying Ye,Heyong Cheng
Two TiO2 inverse opal films (F-TiO2-IOF and CO-TiO2-IOF) were synthesized on glass substrates by a limited planar rapid evaporation method, which was time- and reagent-saving, and it was easy to control their shape. The CO-TiO2-IOF displayed a smoother mophology and better photocatalytic efficiency and stability than F-TiO2-IOF. Over 95% of 5 mg L–1 rhodamine B (RhB) was degraded within 120 s in the IOF-modified microreactors. A higher photocatalytic efficiency could be achieved with the synergistic catalysis of H2O2 and CO-TiO2-IOF, based on which the online monitoring of RhB was realized within 2 min in the IOF-modified photocatalytic microreactor integrated with the flow cell of a UV–vis spectrophotometer. Other nitrogen-containing dyes like tartrazine and indigo carmine were also degraded in CO-TiO2-IOF-modified microreactors with degradation rates of 83–95%.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Weilong Rong,Yiqing Zeng,Shule Zhang,Qin Zhong
The technology of simultaneous ammonia selective catalytic reduction (NH 3 -SCR) denitration and carbon monoxide (CO) oxidation is a proposed approach for synergistic purification of nitrogen oxides (NO x ) and CO from flue gas. However, the lack of highly efficient catalysts has hindered the widespread adoption and application of this technology. Herein, a series of CuSO 4 /TiO 2 (denoted CuS/Ti-X, X means calcination temperature at 400, 500, and 600 °C) catalysts was prepared to investigate their performance for simultaneous NH 3 -SCR denitration and CO oxidation. The results show that dispersing CuSO 4 on TiO 2 carrier induces the formation of surface Cu-O defect structure and reduces the stability of the Cu-O-S structure, which gives CuS/Ti-X catalysts a good redox property. Hence, the CuS/Ti-500 catalyst exhibits good catalytic activity in simultaneous removal of NO and CO, even in the presence of SO 2 . Reaction process investigation demonstrated that the presence of NO and NH 3 inhibits the adsorption of CO and consumes active oxygen species, thereby suppressing the CO oxidation reaction. In contrast, CO can promote the activation of NH 3 via activating the redox sites, which is conducive to the NH 3 -SCR reaction via the E-R mechanism. This study provides new insights into the strategic design of dual-functional sulfur-resistant catalysts for flue gas purification.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 17
·期 1
·563-574
·
IF 4.198
Enyan Guo,Longwei Yin
We report on high-performance dye-sensitized solar cells (DSSCs) based on nitrogen doped anatase TiO2–CuxO core–shell mesoporous hybrids synthesized through a facile and controlled combined sol–gel and hydrothermal process in the presence of hexadecylamine as the structure-directing agent. The matching of band edges between CuxO and TiO2 to form a semiconductor heterojunction plays an important role in effective separation of light induced electrons and holes, providing a promising photoanode for DSSCs because of its wide absorption spectrum, high electron injection efficiency, and fast electron transference. DSSCs based on the mesoporous TiO2–CuxO core–shell hybrids show a high short-circuit current density of 9.60 mA cm−2 and a conversion efficiency of 3.86% under one sun illumination. While DSSCs based on the N-doped mesoporous TiO2–CuxO hybrids exhibit the higher short-circuit current density of 13.24 mA cm−2 and a conversion efficiency of 4.57% under one sun illumination. In comparison with un-doped TiO2–CuxO hybrids, the doping of nitrogen into the lattice of TiO2 can extend the light absorption in the ultraviolet range to the visible light region and effectively decrease the recombination rate of photo-generated electrons and holes. The presented N-doped mesoporous TiO2–CuxO hybrids as photoanodes could find potential applications for high performance DSSCs.
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MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Fengyan Xie,Chunlei Huang,Guofa Dong,Minghui Wu,Kechen Wu,Shaowu Du,Yafeng Li,Mingdeng Wei
Perovskite solar cells (PSCs) fabricated of TiO 2 electron transporting material (ETM) have aroused tremendous attention, but their power conversion efficiency (PCE) needs further improvements. In this study, for the first time, zirconium (Zr)-doped brookite TiO 2 nanorods (ZTO) are synthesized by a facile route and subsequently employed as an ETM in PSCs which finally achieves a considerable PCE of 19.42 % by optimizing all operating conditions. Further characterizations have been undertaken to explore in detail the effects of Zr doping on the nature of the perovskite active layer and the photovoltaic performance. As a consequence, the enhanced PCE can be ascribed to the high quality perovskite crystals and a more favorable energy level alignment between the perovskite layer and ZTO mesoporous layer.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Juan Wang,Aoxiong He,Hao Li,Yi Yang,Zhengguang Wen,Yutong Wang,Zixue Shao,Yuan Chen,Jan-Michael Albina
The development of high-performance lithium-ion battery (LIB) anode materials is essential for addressing growing energy demands. Traditional graphite anodes, limited by a theoretical capacity of 372 mAh/g. In this study, we synthesized core-shell TiO 2 @Mn 2 O 3 microspheres by coating Mn 2 O 3 onto anatase TiO 2 microspheres. The TiO 2 @Mn 2 O 3 anode exhibited an increased specific capacity of 486 mAh/g after 100 cycles and retained 204.8 mAh/g even after 500 cycles at a current density of 2 C. Furthermore, first-principles calculations revealed that the TiO 2 @Mn 2 O 3 heterostructure narrowed the band gap, improved electronic conductivity, and enhanced lithium-ion storage and transport properties. The synergistic effects between TiO 2 and Mn 2 O 3 contributed to superior cycling stability, higher capacity retention, and enhanced rate capabilities. Our work establishes a promising strategy for developing high-capacity, durable anode materials to advance the performance of next-generation LIBs, catering to the ever-growing demand for efficient energy storage solutions.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Guanzheng Wang,Zhong Liu,Wenjiang He,Zhentao Yuan,Lu Li,Zhaolin Zhan,Xiao Wang
Despite the advantages of TiO 2 , such as its low cost, long lifespan, and excellent thermodynamic/kinetic properties, its inherent slow ion diffusion limits its commercial application. Therefore, in this work, a three-dimensional(3D) mesoporous rutile TiO 2 hollow sphere suitable for high-energy-density pseudocapacitance and rapid lithium storage was meticulously designed. The average diameter of the hollow spheres is approximately 1.6 μm, with individual mesoporous-spheres assembled from 50 to 300 nm nanoparticles, and the hollow spheres exhibit a high specific surface area of ~58.57 m 2 g −1 and a large pore size of ~14.18 nm. The results demonstrate that the electrochemical performance of 3D rutile TiO 2 hollow sphere samples is superior to that of conventional microsized particles. Specifically, the MS-TiO 2 –2 sample retained a high capacity of 295 mAh g −1 after 100 cycles at 0.5C. After 1000 cycles at 1C and 5C, the reversible specific capacities of MS-TiO 2 –2 were 254 and 174 mAh g −1 , respectively. Its pseudocapacitive contribution reached as high as 82 % under a fast cyclic voltammetry scan at 10 mV s −1 . These excellent electrochemical properties are attributed to the unique design and regulation of the three-dimensional mesoporous structure. The precise control of porosity is the primary reason for the optimal electrochemical performance of MS-TiO 2 –2. This anode with the 3D mesoporous structure enables rapid Li + transport, which is of great significance for the design of high-energy-density pseudocapacitors and fast Li + batteries.
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SCRIPTA MATERIALIA
·
2025
·
IF 5.6
Yilong Yang,Xuan Ge,Jianguo Li,Qiaodan Hu
Extreme solidification processes in advanced manufacturing (e.g., laser additive manufacturing and in space fabrication) amplify challenges in predicting phase selection under severe thermodynamic non-equilibrium. Using aerodynamic levitation containerless processing, we investigate the solidification behavior of pseudo-binary MgTiO 3 -TiO 2 system. Our experiments reveal an anomalous trans-phase-regime selection phenomenon in which the thermodynamically stable MgTi 2 O 5 phase is kinetically suppressed from precipitation. This selection arises from nucleation kinetic barriers of MgTi 2 O 5 , where coupled undercooling and compositional fluctuations destabilize critical nuclei formation. By integrating composition- and temperature-dependent interfacial energy dynamics into classical nucleation theory , we develop a predictive framework that quantitatively maps anomalous phase selection regions. This approach establishes the first non-equilibrium kinetic phase diagram of this system with experimental validation, resolving long-standing discrepancies between equilibrium predictions and non-equilibrium experimental outcomes. The proposed methodology establishes a generalized paradigm for phase selection prediction, offering transformative insights into microstructure and phase control under extreme non-equilibrium solidification conditions.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Wenbin Huang,Ningran Hou,Han Yang,Zhen Xu,Tianyu Bai,Fan Shao,Yasong Zhou,Qiang Wei
Series g-C 3 N 4 /Cu/B-TiO 2 (x) composites with different mass ratio of g-C 3 N 4 to Cu/B-TiO 2 were prepared and tested for photocatalytic reduction of CO 2 . The structure–function relationship of the photocatalysts was investigated through various characterization methods and photocatalytic experiments. The results show that g-C 3 N 4 can be uniformly distributed on the surface of Cu/B-TiO 2 and formed a stable heterojunction structure, which effectively reduced the band gap width of the catalyst, thus significantly improving the visible light absorption capacity of the catalyst. The modulation of the composite material properties can be realized by regulating the composite ratio of g-C3N4 and Cu/B-TiO 2 . The rate and selectivity of photocatalytic reduction of CO 2 to produce CO reached the maximum when the mass ratio of g-C 3 N 4 to Cu/B-TiO 2 was 3:7, and the rate of CO production was as high as 32.65 μmol∙g −1 ∙h −1 , which was about 12.87 percentage points higher than that of Cu/B-TiO 2 .
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120635
·
IF 7.2
Nan Xiang,Huajun Sun,Guifeng Tang,Na Zhang,Chuanhui Gao,Yuetao Liu,Chuanxing Wang,Junwei Ding,Li Ding
Photocatalytic conversion of CO 2 into solar fuels presents a promising strategy for mitigating greenhouse gas emissions. The reduction of CO 2 to methanol not only enables carbon resource recycling but also facilitates the production of sustainable fuels. In this study, a litchi-shell-like TiO 2 /WO 3 -5 hollow heterojunction catalyst was constructed, featuring surface alkalization and abundant oxygen vacancies. This unique architecture provides a high specific surface area and plentiful active sites, thereby significantly enhancing CO 2 adsorption capacity. Under neutral conditions (pH = 7), the TiO 2 /WO 3 -5 catalyst achieves a remarkable methanol production rate of 780 μmol·g⁻¹ ·h⁻¹ with a high selectivity of 88.6 %, substantially outperforming its individual counterparts, pure TiO 2 and WO 3 . Furthermore, the catalyst demonstrates excellent stability over multiple reaction cycles. A series of characterizations, including EPR, PL, TRPL, and in situ DRIFTS, collectively verify the formation of a Z-type heterojunction, which effectively promotes the spatial separation of photoinduced charge carriers and suppresses the formation of CO and CH 4 . This work underscores the crucial synergy between Z-type heterojunction engineering and surface defect manipulation in enhancing reaction selectivity and efficiency. The TiO 2 /WO 3 -5 catalyst offers a prospective platform for CO 2 -to-fuel conversion and provides valuable guidance for the design of advanced photocatalysts.
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