MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Zhiwen Shi,Lijuan Qiao,Zhi Jia,Peng Zhang,Bingxin Liu,Li Gao
It is of great significance to detect methanol in human exhaled breath since it may cause neurological disorders. In this study, N-doped Ti 3 C 2 T x MXene was synthesized by annealing and nitrogen doping in clay-like Ti 3 C 2 T x MXene. Then, TiO 2 nanospheres was generated in situ on the surface of N-doped Ti 3 C 2 T x MXene to provide adsorption and reaction sites for methanol. Based on the synergistic effects of electronic properties and gas adsorption, the N-Ti 3 C 2 T x MXene/TiO 2 exhibits high responsiveness and excellent selectivity to methanol at room temperature. Moreover, the detection limit is 0.1194 ppm. In addition, the adsorption and oxidation process of methanol on the N-Ti 3 C 2 T x MXene/TiO 2 was explored by in situ infrared spectra testing to reveal that the oxygen vacancy on the surface of N-Ti 3 C 2 T x MXene/TiO 2 plays an important role in the selective detection of methanol. This experiment provides a feasible solution for the detection of methanol gas in exhaled breath at room temperature.
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Materials Today Chemistry
·
2024
·
IF 6.7
Jianghua Huang,Jiafeng Wei,Fengyuan Tian,Fukun Bi,Renzhi Rao,Yuxin Wang,Hengcong Tao,Ning Liu,Xiaodong Zhang
Volatile organic compounds (VOCs) posed a significant threat to the sustainability of ecosystems and human health, and photocatalytic oxidation technology emerged as one of the promising strategies. In this work, N-doped TiO 2 composites were prepared by ball milling utilized melamine as a precursor for the photodegradation of high-concentration ethyl acetate under visible light. The electric field polarization effect of TiO 2 facilitated the exposure of active sites, promoting separation and migration of photogenerated carriers. DFT calculations further demonstrated that N–TiO 2 possessed better electron transition capabilities and stronger pollutant adsorption abilities. Notably, the optimized N–TiO 2 (9-N-P25) exhibited an ethyl acetate removal rate of up to 98.8 % (2000 ppm) under visible light irradiation, and the speed constant k values (0.09488 min −1 ) was 2.66 folds higher than that of pure TiO 2 (0.03571 min −1 ). The ·O 2 − and ·OH free radicals played major roles in the photodegradation process, and the interaction mechanism between free radicals and pollutant molecules was analyzed through in-situ infrared. Additionally, the mechanism of photocatalytic degradation of ethyl acetate by N–TiO 2 was further elucidated. This work provided new insights into the semiconductor photodegradation of high-concentration VOCs, offering novel pathways for removing VOCs in the atmospheric environment.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
·
IF 4.1
An-ru Yan,Xiao-bo Wang,Ling Zhu,Xue-sheng Liu,Zhi-yong Wang
Economic viability and durability are pivotal challenges limiting the commercial application of proton exchange membrane fuel cells (PEMFC). The development of low Pt usage oxygen reduction reaction catalysts with high catalytic activity and durability is imperative. Carbon support corrosion, as well as Pt particles agglomeration and exfoliation are primary causes of commercial Pt/C catalyst degradation. Here, a composite materials formed by TiO 2 containing oxygen vacancy (O V ) and carbon nanotube (CNT) was used as a functional support to successfully load Pt nanoparticles (NPs). The oxygen vacancy facilitated interactions between TiO 2 (O V ) and Pt, enhancing the anchoring of Pt NPs and suppressing particle growth. The Pt/TiO 2 (O V )-CNT demonstrates excellent performance with mass activity of 788 mA/mg Pt @0.85 V, the half-wave potential increased 34 mV and the tafel slope decreased by 11.89 mVdec −1 compared to commercial Pt/C. The durability of Pt/TiO 2 (O V )-CNT nearly 3-fold that of commercial Pt/C with negligible decay of half-wave potential (0.9 %) and mass activity (16 %). Density functional theory calculations and X-ray photoelectron spectroscopy indicated that the charge transfer from TiO 2 (O V ) to Pt facilitates the formation of strong metal-support interactions (SMSI), leading to a downward shift in the d-band center of Pt and a reduction in the binding strength to *OOH, thus lowering the activation energy of the rate-determining step which in turn promoting the activity of ORR. This study provides a reliable approach for designing catalysts with high activity and durability.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Pengfei Wang,Qixing Zhou,Yuguo Xia,Sihui Zhan,Yi Li
Novel mesoporous carbonate-doped phase-junction TiO 2 nanotubes were fabricated for the first time by a general simple and cost-effective strategy, namely, olive oil-assisted electrospinning. The as-prepared mesoporous carbonate-doped phase-junction TiO 2 nanotubes show a high photocatalytic hydrogen evolution activity of 6108 μmol h −1 g −1 , which is nearly six times higher than that of the commercially available P25. This outstanding photocatalytic performance originates from the morphology, electronic, crystal and textural structures of the photocatalysts. The refined porous structure can increase the optical path by multiple reflection effect, thus enhancing light harvesting. Particularly, first-principles calculations suggest that doping TiO 2 with carbonate can effectively reduce the bandgap of TiO 2 , thus the absorbance of TiO 2 in visible light region can be highly enhanced. Moreover, anatase-rutile phase junctions were elaborately introduced into TiO 2 nanotubes by changing the anneal temperature and the roles of phase junctions are studied by photoelectrochemical measurements, which reveal that appropriate phase junction interface can significantly enhance the charge separation and transfer, hence achieving about 2 and 18 times photocurrent density enhancement compared to pristine anatase and rutile phase samples, respectively. Our study not only demonstrates a facile and eco-friendly strategy to synthesize highly efficient porous TiO 2 -based nanotubes photocatalysts, but also provides a new strategy for rational design and synthesis of advanced photocatalysts by combining the strong synergistic effects of the morphology, electronic, crystal and textural structures.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Jing Wang,Dingke Zhang,Junkai Deng,Shijian Chen
As the world faces serious environmental pollution and energy shortage, developing Vis-light-driven photocatalysts for water splitting is highly attractive in clean energy utilization. Fabricating heterostructures has been proposed to be an efficient system to enhance the photocatalytic activity . However, synthesizing heterostructures with good contact and understanding charge transfer dynamics are still unresolved issues. In this work, a facile calcination approach was used to synthesize red phosphorus (RP) nanostructures/TiO 2 heterostructured composites. The RP nanostructures were directly grown on the TiO 2 nanoparticles with an intimate surface contact. By adjusting the molar ratio of amorphous RP to TiO 2 and the synthesizing temperature, thin nanorod-like RP nanostructures with a large exposed surface and a good surface contacting with TiO 2 were obtained. The synergetic effect of heterostructured RP/TiO 2 composites leads to an enhanced charge separation and transfer, and a better utilization of visible-light. As expected, the RP/TiO 2 -700 °C composites exhibit good photocatalytic activity of degrading RhB and the optimal H 2 evolution rate. This work not only provides a method to prepare earth abundant elemental phosphorus well-contacted heterostructures, expand the well-known UV-active TiO 2 photocatalyst to visible active, but also deepens understanding of charge transfer dynamics in heterostructured photocatalyst.
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Energy Technology
·
2017
·Vol. 6
·期 9
·1660-1666
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IF 2.789
Yinlong Zhou,Peigen Zhang,Yan Sun,Yuhua Shen,Anjian Xie
A facile, efficient and short-time shearing method was developed to synthesize TiO 2 precursor, then followed by calcining in NH 3 gas to obtain nitrogen-doped carbon coated TiO 2 (TiO 2 / N -C) successfully. Interestingly, the prepared TiO 2 / N -C nanospheres were assembled by many tiny nanoparticles (NPs) and possessed rough surface. When used as an anode material, the TiO 2 / N -C exhibited reversible specific capacity of 277 mA h g −1 after 220 cycles at the current density of 0.6 C, indicating the superb cycle stability of TiO 2 / N -C. And a good rate capability at different current densities was also obtained. The excellent performance of the TiO 2 / N -C was due to the nitrogen-doped carbon and assembly structure, which could enhance the electrical conductivity and buffer the volume expansion during the charge and discharge process. Furthermore, the tiny NPs can short the transportation path of lithium ions and the gaps produced between connective tiny NPs could accommodate the volume change. So, the method of high speed shearing has great potential in synthesizing other anode materials for lithium ion batteries.
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CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Xiang Lv,Tianhe Wang,Wei Jiang
We report a novel method to prepare translucent and stable Ag@AgCl/g-C 3 N 4 /TiO 2 ceramic films having strong photocatalytic activities and self-cleaning capabilities under light irradiation. Colloidal silica was used as an inorganic binder and P25 TiO 2 was added as a hydrophilicity enhancer without which a smooth coating was not achievable. Ag@AgCl of particle size around 30 nm, was synthesized by in-situ oxidation of nano-silver particles in porous g-C 3 N 4 /TiO 2 films. Optimal conditions for Ag@AgCl/g-C 3 N 4 /TiO 2 preparation in terms of strongest photocatalysis were established by tests on Rhodamine B degradation under visible and full spectral irradiations. A good adhesion strength of the porous films on glass substrate was achieved. Stability and reusability of the films were assessed by cycling tests. Possible photocatalytic mechanisms are proposed based on the basis of trapping experiments. Systematic characterization of the film suggests that the in-situ oxidation is an effective and practical method to produce nanoscale Ag@AgCl.
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Materials Today Chemistry
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2018
·
IF 0
Ce Wang,Chao Tan,Weiqiang Lv,Gaolong Zhu,Zhaohuan Wei,Kelvin H.L. Zhang,Weidong He
In this work, we report the synthesis of a Bi 2 O 3 -TiO 2 hetero-junction (HJ) material through a facile colloidal method. The hetero-junction formation follows a growth with a 145°Bi 2 O 3 /TiO 2 crystal angle, owing to the large lattice mismatch between Bi 2 O 3 and TiO 2 crystals. With the Bi 2 O 3 -TiO 2 hetero-junction material as a photocatalyst , methyl orange is degraded completely within two hours under common UV-lamp irradiation. The photo-catalyst remains highly-active for complete photo-degradation of methyl orange even after multiple experiments. The remarkable photo-catalytic properties are attributed to the remarkable mono-dispersivity of the colloidal Bi 2 O 3 -TiO 2 nano-structure as well as the refined band structure with a valence band of 0.85 eV below that of TiO 2 crystal.
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ChemSusChem
·
2017
·Vol. 11
·期 1
·171-177
·
IF 7.226
Minghua Li,Yahuan Huan,Xiaoqin Yan,Zhuo Kang,Yan Guo,Yong Li,Xinqin Liao,Ruxiao Zhang,Yue Zhang
Graphical Delete hysteresis? Efficient and hysteresis-less perovskite solar cells are prepared by using YCl 3 -treated TiO 2 electron transfer layers. The YCl 3 treatment increases the film conductivity and raises the lower boundary of the TiO 2 conduction band. The average device efficiency reaches approximately 18.82 %, owing to better energy level alignment and favorable charge transfer. Hybrid organic–inorganic metal halide perovskite solar cells have attracted widespread attention, owing to their high performance, and have undergone rapid development. In perovskite solar cells, the charge transfer layer plays an important role for separating and transferring photogenerated carriers. In this work, an efficient YCl 3 -treated TiO 2 electron transfer layer (ETL) is used to fabricate perovskite solar cells with enhanced photovoltaic performance and less hysteresis. The YCl 3 -treated TiO 2 layers bring about an upward shift of the conduction band minimum ( E CBM ), which results in a better energy level alignment for photogenerated electron transfer and extraction from the perovskite into the TiO 2 layer. After optimization, perovskite solar cells based on the YCl 3 -treated TiO 2 layers achieve a maximum power conversion efficiency of about 19.99 % (19.29 % at forward scan) and a steady-state power output of about 19.6 %. Steady-state and time-resolved photoluminescence measurements and impedance spectroscopy are carried out to investigate the charge transfer and recombination dynamics between the perovskite and the TiO 2 electron transfer layer interface. The improved perovskite/TiO 2 ETL interface with YCl 3 treatment is found to separate and extract photogenerated charge rapidly and suppress recombination effectively, which leads to the improved performance.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yin Hu,Wei Chen,Jianping Fu,Mingwei Ba,Fuqian Sun,Peng Zhang,Jiyong Zou
Benzene is currently recognized as one of the most toxic contaminants. Our previously published study revealed that BiVO 4 /TiO 2 is an excellent photocatalyst toward the degradation of benzene. Herein, BiVO 4 /TiO 2 has been synthesized via a sol-gel method and a facile hydrothermal route by adjusting the precursor hydrolysis rate with the use of different acids (CH 3 COOH, HNO 3 and H 2 SO 4 ). The influence of these acids on the physicochemical characteristics and photocatalytic performance is discussed in detail. X-ray diffraction and N 2 sorption analyses confirm that acid has an important effect on the crystalline composition and BET specific surface area. BiVO 4 /TiO 2 synthesized in CH 3 COOH has better photocatalytic activity for the degradation of gaseous benzene than that in HNO 3 and H 2 SO 4 under visible light irradiation. Results of XPS measurement demonstrate that the hydroxyl group in BiVO 4 /TiO 2 -CH 3 COOH is more abundant than that in BiVO 4 /TiO 2 -HNO 3 and BiVO 4 /TiO 2 -H 2 SO 4 . The photocurrent signal is investigated by electrochemical measurement, which indicates that more effective separation of photogenerated carriers occurs in the BiVO 4 /TiO 2 /CH 3 COOH system. It is hoped that our work can offer valuable information on the design of TiO 2 composites with enhanced properties.
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 10
·1701574
·
IF 4.834
Peng Guan,Hongye Bai,Chunfa Li,Yilin Ge,Dongbo Xu,Biyi Chen,Teng Xia,Weiqiang Fan,Weidong Shi
Overcoming one of most challenging limitations of bare TiO 2 with large bandgap can be achieved by rational design and fabrication of heterostructures. Multicomponent sulfides with a nature of tunable band structure can be a good alternative to decorating TiO 2 , but there remains a major trade-off between the high efficiency and the long-term durability, so the stability issue must be addressed upon the use of sulfides. Here, an effective strategy is demonstrated with Bi-doped AgIn 5 S 8 (Bi-AgIn 5 S 8 ) decorated TiO 2 photoanode, where twofold enhancement of the photocurrent is achieved. More importantly, it is the first time to integrate polydopamine passivation layer and AgIn 5 S 8 for simultaneously enhancing the solar conversion efficiency and stability. The incident photon-to-current conversion efficiency value is tuned up to 45% (0.4 V vs Ag/AgCl), and the photocurrent density can keep for 90.8% after 5 h. Corresponding hydrogen evolution rate has increased to 8.6 µmol h −1 , which is three times higher than that of bare TiO 2 .
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ENERGY CONVERSION AND MANAGEMENT
·
2017
·
IF 5.589
Wenjia Wang,Lei Yang,Zhaosen Yin,Shengyan Kong,Wei Han,Jinglai Zhang
In this study, human feces were hydrothermal liquefied and converted into biocrude over Ni-Tm/TiO 2 catalyst. The influence of catalysts, reaction temperature, and holding time on the distribution of products and element content of biocrude was assessed. The biocrude yield increased to 53.16% with a reaction temperature of 330 °C, a holding time of 30 min, and adding Ni-Tm/TiO 2 catalyst while the liquefaction conversion peaked at 89.61%. The biocrude had an HHV of 36.64 MJ/kg and was similar to heavy crude oil. The biocrude is rich in fatty acid amides, esters, and oxygen-containing-only heteroatom-ring compounds as well as some nitrogen-containing heteroatom-ring compounds. The main gaseous products were CO 2 , CH 4 , and C 2 H 6 . Hydrothermal liquefaction over Ni-Tm/TiO 2 catalyst could be a potential method to handle human excrement treatment and produce biofuel.
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