JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Zhu Wenjun,Zhang Bofeng,Kuang Jiaming,Zhang He,Cui Yang,Liu Pinle,Xie Mengzhen,Xiao Yuchen
Herein, TiO 2 -coated carbon cloth (CC) substrates were successfully synthesized. The relationship between heat treatment temperature and the structure and electrochemical performance of the CC/TiO 2 composites was examined, and a feasible model was proposed based on the structural evolution process under different heat treatment temperatures. As the temperature was increased from 450°C to 900°C, the morphology of the TiO 2 coating was transformed from nanocube particles to nanorods, and a mixed structure of particles and nanorods was obtained for CC/TiO 2 -800°C. As the anode electrode for lithium-ion batteries (LIBs), the CC/TiO 2 -800°C composite material presents superior structural stability and electrochemical performance; the initial discharge/charge specific capacities are 2372 and 1989 mAh/g (coulombic efficiency of 83.9%), and a satisfactory specific capacity of 994 mAh/g can be achieved under the condition of 0.5 A/g and 130 cycles. The excellent electrochemical properties can be explained by the unique structure. The CC substrate has high electrical conductivity, significantly enhancing the electron transfer performance of the composite materials. In addition, electron transport in three dimensions can be realized as a result of the synergistic effect of the CC substrate and TiO 2 coating composed of nanoparticles and nanorods. Moreover, the mixed structure of the TiO 2 coating reduces the diffusion distance of Li + ions and suppresses the volume variation during the electrochemical reaction.
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高影响因子
Frontiers of Materials Science
·
2024
·Vol. 18
·期 3
·1-12
·
IF 2.5
Wang Wenshuang,Pan Xingya,Zhang Xinxin,Wang Minglin,Wang Zijia,Feng Lingzhi,Wang Xiaolei,Zhao Kongyin
Combining molecular imprinting technique with titanium dioxide (TiO 2 ) photocatalysis technique can improve the degradation ability and selectivity of TiO 2 nanoparticles towards pollutants. In this work, methyl orange-imprinted polysiloxane particles (MIPs) were synthesized using TiO 2 as matrix and silane as functional monomers. The adsorption capacity ( Q e ) of MIPs was 20.48 mg·g −1 , while the imprinting efficiency (IE) was 3.4. Such MIPs exhibited stable imprinting efficiencies and adsorption efficiencies towards methyl orange (MO) in the multi-cycle stability test. Photocatalytic degradation performances of both MIPs and non-imprinted polysiloxane particles (NIPs) were investigated. Compared with NIPs, MIPs exhibited better photocatalytic degradation performance towards MO, with the degradation efficiency of 98.8% in 12 min and the apparent rate constant ( K obs ) of 0.077 min −1 . The interaction between silane and MO was also studied through molecular dynamics simulation. This work provides new insights into the use of silane for the synthesis of MIPs as well as the molecular imprinting technique for applications in the field of TiO 2 photocatalysis.
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CHEMOSPHERE
·
2018
·
IF 4.427
Ting Tang,Guining Lu,Wenjing Wang,Rui Wang,Kaibo Huang,Zhiyuan Qiu,Xueqin Tao,Zhi Dang
In this study, the TiO 2 -mediated photocatalytic removal of organic phosphate esters (OPEs) under UV irradiation was investigated. In addition, the effects of selected inorganic ions and humic acid (HA) were examined. TCEP, TCPP, and TDCPP hardly undergo degradation via photolysis, and TiO 2 -mediated photocatalysis was confirmed to be effective for removing OPEs present in a water matrix. Inorganic ions (e.g., PO 4 3− , SO 4 2− , Cl − , and NO 3 − ) and HA inhibited the degradation of OPEs. Among these selected ions, PO 4 3− exhibited the strongest inhibition ability, followed by SO 4 2− and then Cl − and NO 3 − , and the inhibition effect increased with the ion concentration . The inhibition effect was caused by two main reasons: (1) Inorganic ions or HA served as ·OH scavengers and competed with OPEs for ·OH. (2) On account of the adsorption of inorganic ions and HA on TiO 2 , the available surface-active sites for OPEs decreased, followed by their oxidation with surface-bound ·OH. The ·OH concentrations were measured by electron spin resonance and the probe method, and it was positively correlated to the degradation rate of OPEs. This study emphasized the importance of inorganic species and HA on the photocatalytic degradation of OPEs and clarified the inhibition mechanism for the degradation of OPEs by the inorganic species or HA.
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Nano Research
·
2024
·Vol. 17
·期 6
·4834-4843
·
IF 9.5
Guo Zhiren,Zhang Xiao,Li Xinyuan,Cui Chang,Zhang Zilei,Li Hansheng,Zhang Dongxiang,Li Jinying,Xu Xiyan,Zhang Jiatao
Photocatalytic oxidation techniques are promising for degradation of the highly ecotoxic and refractory isothiazolinone bactericides in relevant industrial wastewaters. However, low charge separation and directional transport efficiency under solar light radiation restrain their practical application. Here, we report a nanostructured photocatalyst doped with Gd and B in TiO 2 with carbon incorporation and defect formation through incomplete calcination. The specific surface area, grain size, and hydrophilicity of TiO 2 are improved, which is beneficial for the interfacial reaction between the photocatalyst and pollutants. The reduction of the bandgap, the broadening of the photo-absorption range, and the retarded electron-hole recombination promote the photocatalytic performance due to the improved oxygen vacancies based on the electron distribution modification. The difference in partial density of states (ΔPDOS) between the current catalyst and raw TiO 2 indicates that the co-doping of Gd and B with incomplete calcination changes the electronic hybridization of conduction band and valence band near the Fermi level, and affects the band gap energy. It improved charge separation and directional transport efficiency and benefited the formation of main active species, including OH and O 2 − , for the pollutant decomposition. The rate of photocatalytic removal of benzisothiazolinone (BIT) by the current photocatalyst reaches 1.25 h −1 , being 4.31 times that of TiO 2 . The current work offers a constructive approach to the design and synthesis of nanostructured photocatalysts for the photocatalytic degradation of refractory organic pollutants.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2019
·Vol. 66
·期 7
·740-747
·
IF 1.188
Chenghao Mo,Huixian Wei,Tongjun Wang
Self-doped TiO 2 nanotube array (DTNA) electrodes were fabricated through anodic oxidation combined with cathodic reduction. The morphology and structural features of pristine TiO 2 nanotube arrays and DTNA electrodes were studied through scanning electron microscopy, X-ray diffractometry, and X-ray photoelectron spectroscopy. An accelerated life test was used to test the electrode service lifetime and thus the electrode's stability. The service lifetime of the DTNA electrode prepared at constant 40 V for 6 hr was approximately 338.7 hr at constant 1 mA/cm 2 in a 1 M NaClO 4 solution. Methyl orange (MO) was employed as the degradation probe for measuring electrochemical oxidation performance. The color removal rate of 200 mg/L MO of the DTNA electrode (85.2% at 1 mA/cm 2 ) was greater than that of the Ti/IrO 2 electrode (31.1% at 1 mA/cm 2 ). The larger the surface area of the DTNA electrode is, the more conductive the electrode is for the degradation of organic substances. Organic degradation on the DTNA electrode occurred primarily through an indirect pathway (producing [∙OH]).
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Bozhi Wu,Kuibo Yin,Yuheng Huang,Yongqiang Yang,Zhangping Wen,Jiahong Kang,Yuwei Xiong,Qian Zhang,Meng Nie,Litao Sun
Nowadays, piezoelectric nanogenerators (PENGs) based on poly(vinylidene fluoride) (PVDF) have exhibited extensive potential applications in wearable electronics. Improving the piezoelectric performance of PVDF-based PENGs through low-cost and nontoxic fillers is an attractive technology for industrial applications. Herein, we propose a superior piezoelectric performance of PVDF-based PENG with cheap and nontoxic TiO2 nanorods as the regulated fillers. The built-in electric field of the constructed heterostructures in mixed-phase (anatase–rutile) TiO2 nanorods enriches the formation of electroactive β-phase (87.6%) in PVDF. Moreover, the piezoelectric output of the TiO2@PVDF-based PENG (TP-PENG) reaches 42.5 V, which is 15.7 times higher than the pure PVDF-based PENG with the same electrospinning process. The TP-PENG exhibits superior durability within 9000 cycles, being capable of charging the capacitors, powering the diode light-emitting diode (LED) lights, and monitoring real-time human movements. This promotes the great potential of the PENG for a variety of applications, including biomechanical energy harvesting, motion sensing, and powering microelectronic devices. Most importantly, this study demonstrates that the strategy of controlling phase transition and switching between crystal structures is of great relevance to extending the kinds of possible regulating fillers to enhance the performance of PVDF-based PENGs. It provides a promising low-cost and nontoxic approach for the development of high-performance PENGs.
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高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4669-4679
·
IF 2.8
Tang Liping,Wu Yankang,Lei Zhiqiang,He Yu,Chen Jian
An in situ–grown TiO 2 membrane was prepared by an electrospinning method using polyacrylonitrile as the spinning precursor, combined with the TiO 2 hydrolysis mechanism. The performance of tetrabutyl titanate and isopropyl titanate as two titanium source precursors hydrolyzed under the inhibition of acrylic acid to produce TiO 2 with different contents for lithium-ion batteries was compared. The experimental results showed that when both titanium sources were prepared at 3 wt%, the comprehensive performance of the separator manufactured with tetrabutyl titanate as the titanium source (PAN/TBT-3) and isopropyl titanate as the titanium source (PAN/TPT-3) was finest than that of the Celgard 2400 and the composite membrane with direct TiO 2 addition (PAN/TiO 2 -3). The tensile strength of PAN/TPT-3 and PAN/TBT-3 membranes were 7.82 MPa and 4.03 MPa higher than that of Celgard 2400, and 17.03 MPa and 13.29 MPa higher than that of PAN/TiO 2 -3 separator, respectively. PAN/TPT-3 and PAN/TBT-3 membranes exhibited a discharge capacity of 107.72 mAh/g and 115.79 mAh/g at 2 C, and both the capacity retention rate was above 99.5% higher than 80.5% for Celgard 2400.
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高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 3
·891-900
·
IF 2.2
Wang Hongyang,Yu Haiyang,Wang Junsheng,Li Ting-Ting,Lin Jia-Horng,Lou Ching-Wen
Cotton fabrics are susceptible to contamination in daily use. Herein, this study developed a scalable and benign strategy to impart superhydrophobic and photocatalytic properties to cotton fabrics by impregnating SiO 2 –TiO 2 Janus particles (SiO 2 –TiO 2 JPs) and silicone elastomer polydimethylsiloxane (PDMS). SiO 2 –TiO 2 Janus particles were synthesized by Pickering template method. The obtained cotton fabrics exhibited good superhydrophobic properties with a water contact angle (WCA) of 155° as well as mechanical and chemical stability. The modified fabrics maintained their superhydrophobic properties against 30 cycles of mechanical abrasion, 15 cycles of tape peeling, and 24 h of UV aging. They also had good resistance to n-hexane, acetone, acid/alkali liquids. The degradation efficiency of Rhodamine B (RhB) was up to 63% after 6 h of UV irradiation and still 48% after 5 cycles of degradation. The facile approach in favor of large-scale preparation showed promising potential for wide application of flexible, superhydrophobic cotton fabrics with self-cleaning performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hailiang Chu,Chengwang Yin,Yongpeng Xia,Yong Shen Chua,Shujun Qiu,Fen Xu,Lixian Sun
While magnesium hydride (MgH 2 ) is widely acknowledged as an encouraging solid-state hydrogen storage material , its practical utility is hampered by the elevated operating temperatures and sluggish kinetic characteristics. To address these limitations, a composite catalyst consisting of Ni nanoparticles (NPs) deposited onto TiO 2 microspheres (Ni/TiO 2 -MS) was developed and employed as a catalytic agent to enhance the hydrogen desorption and absorption properties of MgH 2 . Remarkably, the introduction of Ni/TiO 2 -MS resulted in a significant reduction of the initial dehydrogenation temperature of MgH 2 to 181.4 °C, demonstrating a decrease of 78.2 °C compared to ball-milled MgH 2 (BM-MgH 2 ). The optimal BM-MgH 2 -Ni/TiO 2 -MS facilitated the desorption of 6.3 wt % of hydrogen within 5 min at 300 °C, while at 150 °C, its dehydrogenated product could absorb 5.4 wt % of hydrogen in only 1 minute. Moreover, the BM-MgH 2 -Ni/TiO 2 -MS sample exhibited remarkable cycling stability over 20 cycles. Through the mechanistic analysis, the simultaneous presence of in-situ formation of Mg 2 Ni/Mg 2 NiH 4 and multivalent titanium species engendered a synergistically catalytic effect, significantly enhancing the hydrogen storage capabilities of MgH 2 . This study affords a very potential strategy for the design of active catalysts aimed at enhancing the hydrogen dehydrogenation/absorption kinetics of MgH 2 .
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6885-6893
·
IF 2.047
Song Angang,Cao Guoqin,Zhu Di,Zhao Baofeng,Fu Zhenya,Cao Shuaiqi,Wang Qingjie,Hu Junhua
Nb-doped TiO 2 (NTO) thin films were sputtered on glass substrate followed by a simple annealing process in air. The photoelectric cooperative optimization was discussed based on the structural, optical and electrical characteristics. The influence of oxygen flow during deposition on materials chemistry and performance was analyzed. Hall measurement showed a strong dependence of transparent conductivity on the oxygen flow. Oxygen vacancies are related to the phase transitions from the rutile to anatase TiO 2 during annealing. The chemical states of Nb, Ti and O before and after annealing were discussed. The achievement of optimized transparent conductivity was resultant from the fine-tuning of the doped chemistry and special interplay of dopants and host lattice. Graphical
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-8
·
IF 2.7
Wang Dongyang,Zou Wenhua,Chen Yexin,Duan Junhong
In this work, different percentages of Eu-doped TiO 2 nanoparticles were synthesized by sol–gel method. The bandgap and conduction band minimum (CBM) of TiO 2 nanoparticles doped by 0.075 at% Eu element is reduced from 3.43 and – 3.93 eV to 3.09 and – 4.25 eV, respectively, deduced from the results of ultraviolet–visible (UV–Vis) absorption spectroscopy and ultraviolet photoelectron spectroscopy (UPS) measurement compared with un-doped TiO 2 . As the increase of Eu concentration, short-circuit photocurrent density J sc of CdSe quantum dot-sensitized solar cells (QDSCs) increases from 10.86 to 13.86 mA/cm 2 , while open-circuit voltage V oc is almost invariable. Optimal power conversion efficiency (PCE) of 4.03% is achieved for CdSe QDSCs with 0.075 at% Eu-doped TiO 2 film. Compared with un-doped devices, the decrease of the chemical capacitance C μ and the increase of recombination resistance R rec of QDSCs based on the 0.075 at% Eu-doped TiO 2 photoanodes can facilitate charge extraction and suppress charge recombination at the TiO 2 /electrolyte interface.
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高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Shen Liyan,Xing Zipeng,Zou Jinlong,Li Zhenzi,Wu Xiaoyan,Zhang Yuchi,Zhu Qi,Yang Shilin,Zhou Wei
Black TiO 2 nanobelts/g-C 3 N 4 nanosheets laminated heterojunctions (b-TiO 2 /g-C 3 N 4 ) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in - situ solid-state chemical reduction approach, followed by the mild thermal treatment (350 °C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that special laminated heterojunctions are formed between black TiO 2 nanobelts and g-C 3 N 4 nanosheets, which favor the separation of photogenerated electron-hole pairs. Furthermore, the presence of Ti 3+ and g-C 3 N 4 greatly enhance the absorption of visible light. The resultant b-TiO 2 /g-C 3 N 4 materials exhibit higher photocatalytic activity than that of g-C 3 N 4 , TiO 2 , b-TiO 2 and TiO 2 /g-C 3 N 4 for degradation of methyl orange (95%) and hydrogen evolution (555.8 μmol h −1 g −1 ) under visible light irradiation. The apparent reaction rate constant (k) of b-TiO 2 /g-C 3 N 4 is ~9 times higher than that of pristine TiO 2 . Therefore, the high-efficient laminated heterojunction composites will have potential applications in fields of environment and energy.
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高影响因子
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