Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 5
·2264-2272
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IF 8.867
Jing Li,Hu Zhou,Han Zhuo,Zhongzhe Wei,Guilin Zhuang,Xing Zhong,Shengwei Deng,Xiaonian Li,Jianguo Wang
The key bottleneck of applying Pd catalysts in fuel cells is their low activity and poor stability during the oxygen reduction reaction (ORR) although less precious Pd is still a promising alternative to Pt. Hence, new strategies to improve the performance of Pd in the ORR need to be developed. In this study, supported Pd (3.6 nm in average) catalysts on TiO2 with and without oxygen vacancies (VO) have been prepared via facile pyrolysis. Compared with commercial Pt/C (20 wt%) and Pd/TiO2 catalysts, Pd/TiO2-VO (10 wt%) demonstrated superior oxygen reduction activity, better durability, and higher methanol tolerance capability in alkaline solution. By means of experimental characterizations (ESR and XPS) and density functional theory (DFT) calculations, electron transfer from TiO2-VO to Pd nanoparticles (NPs) led to an electron-rich Pd surface and strong metal–support interactions (SMSIs). The electron-rich Pd NPs enhanced the adsorptions of key intermediates, lowered the Gibbs free energy of the ORR, and improved the ORR activity. SMSIs between Pd NPs and TiO2-VO endowed the catalyst with excellent stability and immunity to methanol poisoning. Therefore, the electron transfer from TiO2-VO to Pd NPs plays a crucial role in promoting the ORR performance of Pd-based electrocatalysts, which may be a new strategy to design high-performance ORR catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Haifeng Zhu,Renjie Ding,Jiashun Zhou,Zhiyuan Lang,Huihua Luo,Kehui Xue,Yaping Zhang,Lianqing Yu
This work proposes a novel strategy which the microwave plasma chemical vapor deposition (MPCVD) technology was used as one important preparation process for synthesizing TiO 2 @Ag@graphene ternary junction. The ternary junction exhibits an enhanced photocatalytic hydrogen production rate of 4.44 mmol·g −1 ·h −1 , which is approximately 9.25 times higher than that of pure TiO 2 (0.48 mmol·g −1 ·h −1 ). The remarkable photocatalytic activity can be attributed to the strong synergistic effect between TiO 2 @Ag and graphene. The loaded Ag and graphene can not only act as electronic conductors to effectively promote the separation of charges, but also obviously improve the response of visible light of TiO 2 . The photogenerated electrons are transferred from TiO 2 to graphene via the Ag medium was further verified by DFT calculations. Constructing an Ag-graphene interface can activate carbon atoms, which can quickly capture electron to fill the π* orbital of graphene. TiO 2 @Ag@graphene ternary junction exhibits a lower ΔG H* value of 0.51 eV than that of TiO 2 @Ag (1.49 eV), which indicates that TiO 2 @Ag@graphene ternary junction with optimal absorption energy for the hydrogen intermediate.
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Materials
·
2024
·Vol. 17
·期 11
·2543
·
IF 3.1
Yuan Chen,Jiatong Yang,Aoxiong He,Jian Li,Weiliang Ma,Marie-Christine Record,Pascal Boulet,Juan Wang,Jan-Michael Albina
Due to the volume expansion effect during charge and discharge processes, the application of transition metal oxide anode materials in lithium-ion batteries is limited. Composite materials and carbon coating are often considered feasible improvement methods. In this study, three types of TiO2@Fe3O4@C microspheres with a core–double-shell structure, namely TFCS (TiO2@Fe3O4@C with 0.0119 g PVP), TFCM (TiO2@Fe3O4@C with 0.0238 g PVP), and TFCL (TiO2@Fe3O4@C with 0.0476 g PVP), were prepared using PVP (polyvinylpyrrolidone) as the carbon source through homogeneous precipitation and high-temperature carbonization methods. After 500 cycles at a current density of 2 C, the specific capacities of these three microspheres are all higher than that of TiO2@Fe2O3with significantly improved cycling stability. Among them, TFCM exhibits the highest specific capacity of 328.3 mAh·g−1, which was attributed to the amorphous carbon layer effectively mitigating the capacity decay caused by the volume expansion of iron oxide during charge and discharge processes. Additionally, the carbon coating layer enhances the electrical conductivity of the TiO2@Fe3O4@C materials, thereby improving their rate performance. Within the range of 100 to 1600 mA·g−1, the capacity retention rates for TiO2@Fe2O3, TFCS, TFCM, and TFCL are 27.2%, 35.2%, 35.9%, and 36.9%, respectively. This study provides insights into the development of new lithium-ion battery anode materials based on Ti and Fe oxides with the abundance and environmental friendliness of iron, titanium, and carbon resources in TiO2@Fe3O4@C microsphere anode materials, making this strategy potentially applicable.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zengliang Ren,Zhicheng Shi,Qingyang Tang,Shuimiao Xia,Liang Sun,Runhua Fan,Hongzhi Cui,Hong Wang
Polymer dielectrics have been widely employed in pulsed power systems, but their applications are severely restricted by the low energy density. Incorporating core-shell nanofillers is one promising strategy to enhance the energy density of polymer dielectrics. Nowadays, core-shell nanofillers are mainly prepared via chemical coating strategies, which always involve complex chemical synthesis procedures. Herein, a unique physical coating strategy is developed to prepare core-shell TiO 2 @Au nanofibers consisting of monodispersed Au nanoparticles homogeneously anchored on the TiO 2 nanofibers. Interestingly, the TiO 2 @Au nanofibers show outstanding dielectric energy storage boosting capability. Specifically, with merely introducing 0.1 wt.% TiO 2 @Au nanofillers, the TiO 2 @Au/PVDF composite exhibits a substantially enhanced breakdown strength of 749 MV m −1 , which reaches 152.8% of PVDF. Meanwhile, a high dielectric constant of 10.2 (114.1% of PVDF) is obtained. Consequently, an ultrahigh energy density of 18.6 J cm −3 , which is 250.1% of PVDF, is achieved. It is further revealed that the significant energy storage boosting effect is originated from the Coulomb blockade and micro-capacitor effects of the TiO 2 @Au nanofibers. This work establishes a unique paradigm for the facile preparation of core-shell nanomaterials, which have huge potential for both dielectric energy storage and other functional nanocomposites.
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Surfaces and Interfaces
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2024
·
IF 5.7
Lai Liu,Ye Tian,Jiangang Yu,Huizhen Yao
Copper zinc sulphide (CZS) due to high conductivity, fast photoresponse and good stability has attracted rising attention in optoelectronic field. Constructing heterojunctions with rational energy bands alignment can accelerate carrier separation to improve the performance of CZS-based photoelectric device. Herein, p-CZS/n-TiO 2 core-shell nanorods heterojunction film was successfully fabricated for the first time. CZS nanoparticles (NPs) were directly loaded on the surface of TiO 2 nanorods (NRs) through a simple chemical bath deposition. Photoelectrochemical (PEC) photodetector based on CZS/TiO 2 composite film was designed and interfacial charge kinetics has also been investigated. The CZS/TiO 2 PEC device exhibits fast response speed of 95/56 ms, high responsivity of 7.1 mA W -1 and detectivity of 5.6 × 10 12 Jones at a bias voltage of 1 V. The light on/off ratio of self-powered CZS/TiO 2 PEC device achieves 5.6 × 10 3 , nearly 30.4 times higher than bare CZS PEC device. Furthermore, the photodetection performance of the CZS/TiO 2 PEC device can be effectively regulated by light power density and environment conditions, promoting its adaptability in multifarious practical applications. The findings suggest that CZS/TiO 2 heterostructure film devices have great potential for high-performance and energy-efficient PEC photodetectors.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Jinlong Cui
In order to expand the photoresponsive spectrum of TiO 2 and improve its catalytic activity under visible light, the hollow urchin-like composites of TiO 2 @g-C 3 N 4 /GQDs (TCN/GQDs) with a core-shell structure heterojunction was synthesized through a hydrothermal method and calcination. Potassium titanium oxalate, melamine, and citric acid were utilized as the raw materials for this synthesis process. The TCN/GQDs composites were subjected to a range of analyses to examine their microstructure and photoelectric properties. The findings indicated that the synthesized composites effectively enhanced the absorption spectrum of TiO 2 in the visible light range by creating the stable heterojunctions among TiO 2 , g-C 3 N 4 and GQDs. Additionally, the ability of these composites to degrade toxic organic pollutants under visible light was studied by using several different organic dyes and antibiotics. The results demonstrated that the TCN/GQDs composites exhibited efficient visible light catalytic degradation capability on organic pollutants, and the degradation efficiency could approach to 100 % under visible light in a short time. Furthermore, the photocatalyst exhibited hardly change of degradation efficiency towards organic pollutants even after 5 cycles of testing, suggesting its commendable performance in visible light catalysis and potential for repeated utilization.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Bai Jiang,Jianxun Shang,Faying Zhang,Na Li,Yan Wang,Zuming Hu,Junrong Yu
In order to face the challenge of achieving high-efficiency and lightweight wave absorption materials, we prepared the poly-m-phenylene isophthalamide (PMIA)/TiO 2 /Fe 3 C (PTF) composites with hollow structure by coaxial electrospinning and carbonization process. PMIA as the carbon source provided a three-dimensional (3D) conductive network, using TiO 2 and Fe 3 C to improve the impedance matching, reinforce the hollow structure, and increase the absorption mechanism of composites. Significantly, the minimum reflection loss (RL min ) value of optimal material is −58.1 dB at 14.88 GHz and the effective absorption bandwidth (EAB) of 6 GHz with the matching thickness of 2.3 mm, and the filling content is only 13 wt%. The excellent absorption property is maintained even after heating, immersing, and long-term use. This work provides the reference of hollow carbon nanofiber absorbers with excellent comprehensive properties and has more powerful practicability in a variety of environmental conditions.
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Materials Today Communications
·
2024
·
IF 3.7
Kunyi Ma,Lin Liu,Yanan Wang,Di Wu,Qingyu Zhao,Jinjuan Xing
In this work, a new polyvinylidene fluoride nano-ultrafiltration membrane modified by graphene oxide/ titanium dioxide doped with cerium composite materials (GO/Ce-TiO 2 -PVDF) was prepared by phase inversion method. The water contact angle, porosity, pore size distribution , and photocatalytic performance of the membrane were studied. Compared with the PVDF membrane, the water contact angle of the modified membrane decreased to 36.5°, the pure water flux improved to 119.64 L·m -2 ·h -1 , and the retention rate of bovine serum albumin (BSA) was 95.3%. The synergistic effect of GO and Ce-TiO 2 could improve the photocatalytic activity of the composite membrane , and the degradation rate of BSA was 97.4%. The flux recovery rate (FRR) of the modified membrane was 82.38%, which was 22.24% higher than that of the PVDF membrane (67.39%). The FRR of the modified membrane increased to 91.54% under water cleaning and UV irradiation. Five cycle experiments showed that the permeate flux of the polluted membrane was further restored from 78.45 L·m -2 ·h -1 to 76.95 L·m -2 ·h -1 after UV irradiation, and the retention rate of BSA was maintained at about 95%. Therefore, as predicted, the GO/Ce-TiO 2 -PVDF membrane could be widely applied in the water treatment industry due to its high anti-fouling and self-cleaning performances.
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RSC Advances
·
2024
·Vol. 14
·期 26
·18432-18443
·
IF 3.9
Jiao Wang,Hemu Pi,Panchao Zhao,Na Zhou
The presence of methyl orange (MO) and ciprofloxacin (CIP) in wastewater poses a serious threat to the environment and human health. Titanium dioxide nanoparticles (TiO2 NPs) are widely studied as photocatalysts for wastewater treatment. However, TiO2 NPs have the drawbacks of high energy required for activation, fast electron–hole pair recombination and difficulty in recovering from water. To overcome these problems, europium decorated titanium dioxide/poly(vinylidene fluoride) (Eu–TiO2/PVDF) membranes were successful prepared in this work by combining the modified sol–gel method and the immersion phase inversion method. The Eu–TiO2/PVDF membranes obtained with the increase of Eu–TiO2 NPs content during the preparation process were named M1, M2 and M3, respectively. The pure PVDF membrane without the addition of Eu–TiO2 NPs was named M0, which was prepared by the immersion phase inversion method and served as a reference. The prepared Eu–TiO2/PVDF membranes could not only adsorb MO, but also degrade CIP under visible-light irradiation. Moreover, the Eu–TiO2/PVDF membranes exhibited adsorption–photocatalytic activity towards a mixture of MO and CIP under visible-light irradiation. Last but not the least, the Eu–TiO2/PVDF membranes exhibited excellent recyclability and reusability, opening the avenue for a possible use of these membranes in sewage-treatment plants.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 3
·697
·
IF 4.6
Fukun Bi,Yaofei Zhang,Zhuoxuan Zhou,Lei Guo,Ziqiao Zhu,Baolin Liu,Xiaodong Zhang
Phthalic acid esters (PAEs), ubiquitous semi-volatile organic compounds (SVOCs) in indoor environments, pose adverse effects on human health. However, their degradation mechanisms and pathways remain unclear. Herein, we developed an efficient photothermal catalyst by introducing defects (oxygen vacancies, OVs) on TiO2(P25) surfaces via electron beam irradiation technology with different irradiation doses (100, 300, 500, and 700 kGy). The TiO2with defects was employed as a support to prepare Pt-TiO2catalysts for the photothermal degradation of di (2-ethylhexyl) phthalate (DEMP) and dimethyl phthalate (DMP), two representative PAEs. TiO2pre-treated with a 300 kGy irradiation dose supported the Pt catalyst (Pt-Ti-P-300) and presented the optimal catalytic performance for DEMP and DMP degradation. Characterization results confirmed that OVs were successfully introduced to the catalysts. Meanwhile, OVs induced by electron beam irradiation expanded the light absorption range and improved the generation and separation of photogenerated carriers, which significantly enhanced the catalytic activity of the catalysts for PAE degradation. Importantly, the degradation mechanism and pathway of DMP were further explored by using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and gas chromatography–mass spectrometry (GC-MS). These findings provide important insights into the electron beam irradiation-mediated regulation of catalysts and the photothermal catalytic removal of PAEs in indoor environments.
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FUEL
·
2024
·
IF 6.7
Jun Zhang,Shuyue Liu,Shiyu Lu,Chunyuan Wang,Pingjuan Liang,Huan Yi,Mengjie Li,Laizheng Luo,Rong Wang,Guangming Jiang
Improving the utilization of hydrogen radicals (H*) is of great significance for effective Pd-mediated electrocatalytic hydrodechlorination (EHDC) in detoxifying chlorinated organic pollutants (COPs). However, the limited H* utilization by single Pd arises from its inadequate performance in adsorbing/activating COPs and inferior mass transfer of low-concentration COPs. In this study, an urchin-like yolk/shell TiO 2 spheres with mesoporous structure are developed for supporting Pd nanoparticles (Pd/U-TiO 2 ), which exhibits superior EHDC activity and selectivity for 2,4-DCP reduction. Notably, the prepared Pd/U-TiO 2 catalyst achieves a mass activity of 4.2 min −1 g Pd -1 and a specific activity of 1.94 min −1 mol Pd -1 when detoxifying 50 mg/L of 2,4-DCP at −0.85 V, surpassing the most reported catalysts. Furthermore, the Pd/U-TiO 2 catalyst consistently demonstrates higher H* utilization efficiency compared to single Pd, regardless of the 2,4-DCP concentration or reaction mode (batch or continuous-flow). This enhanced H* utilization efficiency is attributed to two key factors: the urchin-like and yolk/shell structure of U-TiO 2 enhances the mass diffusion of 2,4-DCP, and the strong interactions between Pd and U-TiO 2 generate electron-rich Pd species that enhance the adsorption and activation of COPs. Overall, this work highlights the synergistic effects of strong metal-support interactions and mass diffusion in enhancing atomic H* utilization. This study lays a significant experimental and theoretical foundation for designing efficient electrocatalysts for the detoxification of chlorinated organic pollutants and various other halogenated organic pollutants.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Daxue Du,Dezhao Zhang,Hong Liu,Wenzhong Shen
The bilayered electron transport layer (ETL) has made significant contributions to enhancing the photovoltaic performance for perovskite solar cells. However, it is generally required to prepare the TiO 2 at a high temperature before adding the SnO 2 layer due to the difference in temperature tolerance, resulting in energy consumption and hampering electron transfer. To address this issue, we proposed a simple low-temperature process based on TiO 2 @SnO 2 nanocrystals for bilayered ETL. The introduction of SnO 2 enhances the Fermi level and lowers the valence band position of TiO 2 nanocrystals, which facilitates electron extraction and hole blocking, leading to the enhancement of open circuit voltage and fill factor. Additionally, TiO 2 @SnO 2 nanocrystals provide a more suitable refractive index and less parasitic absorption than TiO 2 , these optical gains forming a higher short-circuit current. As a result, the champion efficiency of the perovskite solar cell was significantly raised from 16.17% to 19.04% along with enhancement in the stability and hysteresis phenomena. Moreover, photovoltaic performance can be further increased by combining perovskite component engineering and interfacial passivation because of the high compatibility of TiO 2 @SnO 2 ETL.
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