ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Juan Wu,Mixiang Qi,Gang Wang,Bin Yu,Chengdong Liu,Wei Hou,Weisheng Liu
A passivation layer plays an important role in suppressing charge recombination on surface trap states. However, the effect of a single passivation layer is limited. Building a passivation system containing multiple passivation layers with different functions for efficient charge separation presents a challenge. In this study, we demonstrate the synergistic passivation effect between a metal–organic framework-derived TiO2 nanoparticle layer and an ultrathin carbon layer, which facilitates the charge separation of an α-Fe2O3 photoanode with a surface separation efficiency of 57%. The α-Fe2O3/TiO2/C photoanode generates a photocurrent of 1.93 mA cm–2 at 1.23 V vs a reversible hydrogen electrode, which is about 3.22 times higher than that of pristine α-Fe2O3. After the introduction of the cocatalyst β-FeOOH onto the α-Fe2O3/TiO2/C photoanode, a higher photocurrent of 2.95 mA cm–2 is generated under the same condition without doping and constructing a heterojunction.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6543-6549
·
IF 3.591
Ziqi Zhang,Xiang Ni,Kaida Yao,Siqi Zhang,Yang Liu,Yueqiu Sun,Xiangzhi Wang,Weimin Huang,Yan Zhang
Titanium has been applied to implants over the last decades due to its excellent biocompatibility and mechanical properties. However, there are still some drawbacks for titanium and its alloys to overcome. Thus, in this study, a novel electrochemical synthesis process has been developed to fabricate TiO2 nanotube array, hydroxyapatite and rare-earth (La3+) doped ZIF-8 nanoparticle composite coating, which can enhance the antibacterial and anti-corrosion property on the premise of minimizing the biocompatibility loss of titanium implants. Compared with traditional processing methods, electrochemical machining is more time-saving, energy-saving and environment-friendly. Thus, it provides an alternative way to produce medical implants.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Wei Yuan,Zhen Zhang,Xiaoling Cui,Huarong Liu,Chen Tai,Yuanrui Song
Hollow mesoporous CdS@TiO2@Au microspheres as a photocatalyst have been successfully synthesized by γ-irradiation deposition of Au nanoparticles (NPs) on the double shell of hollow CdS@TiO2 microspheres, which are prepared via the “hard core template” approach combining with calcination and solvothermal reaction. The morphology, structure, and properties of the as-prepared hybrid photocatalyst have been characterized by TEM, XRD, XPS, N2 adsorption–desorption, UV–vis DRS, PL, and photoelectrochemical measurements. The results show that the hollow mesoporous double-shell structure is formed with a fluffy TiO2 coating on the surface of the CdS shell composed of stacked CdS NPs. This ternary hybrid photocatalyst exhibits excellent photocatalytic activity for hydrogen evolution and stability under visible-light illumination, which is attributed to the unique ternary hollow mesoporous double-shell heterostructure that may extend the light responsive region, enhance the light-harvesting efficiency, prevent the direct contact between the CdS shell and O2 and H2O, facilitate mass transfer, reduce the recombination rate of charge carriers, and promote the efficiency of water splitting H2 evolution ultimately. The photocatalytic hydrogen generation rate (1720 μmol·g–1·h–1) of the hollow CdS@TiO2@Au microspheres is 2.37 and 12.7 times higher than those of hollow CdS@TiO2 and CdS microspheres, respectively. The loading amount of Au NPs also influences the photocatalytic hydrogen evolution activity of the ternary photocatalyst. Our work expands the application of hybrid hollow microsphere photocatalysts in photocatalytic hydrogen generation by the rational design for enhancing photocatalytic activity under visible light.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 7
·1-12
·
IF 2.8
Yin Lixiong,Guo Yao,Liu Changqing,Li Luyao,Fan Dejiang,Huang Jianfeng,Zhang Qinghua,Wang Tao,Chen Yufei
Carbon-based organic-inorganic perovskite solar cells (C-PSCs) are low-cost photovoltaic cells. However, the carrier recombination caused by interface defects and the mismatched interface energy level limits the further improvement of the efficiency of C-PSCs. In this work, SmCl 3 was introduced as a “double-sided” modifier to achieve interfacial modification. After modified, Cl − passivated the oxygen vacancy defects on the TiO 2 surface. Meanwhile, Sm 3+ was diffused into the perovskite interface in the form of a concentration gradient, which balanced the non-coordinated Pb 2+ and improved the energy level arrangement. Due to good interfacial contact, the reduced interfacial non-radiative recombination, and rapid charge extraction and transport, the optimized C-PSCs efficiency was increased from 11.03 to 13.4%. In addition, the unencapsulated champion PSC remained stable for long-term stability after the sustained attack for 800 h at room temperature of 20% RH. This work proposed a straightforward interface modification strategy to improve the efficiency of C-PSCs.
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高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 124
·期 2
·587-601
·
IF 1.515
Wang Tao,Zhang Xinyu,Liu Jun,Liu Hanzi,Sun Baomin
NO conversion using dielectric barrier discharge (DBD) plasma with different catalysts was investigated. Cu/TiO 2 , Cu/Al 2 O 3 , Cu/ZSM-5, Cu/CNTs and Cu/AC catalysts were prepared by incipient wetness impregnation with 4 wt% Cu loaded. BET, SEM, XRD, XPS, H 2 -TPR, NH 3 -TPD were used to measure and evaluate various catalysts. Compared with the plasma only process, the combination of plasma with different catalysts significant improved the NO conversion rate. The highest NO conversion rate of 76% could be achieved with Cu/ZSM-5 catalyst at the energy density of 184 J/L. The results indicate that Cu species over the support ZSM-5 can produce high concentrations of CuO, largest specific surface area, largest amounts of acidity and lowest reduction temperature (209 °C), these factors conducive to plasma-catalyst reaction. Besides, Cu/TiO 2 and Cu/Al 2 O 3 catalysts exhibited excellent NO conversion at the low energy density because of the low thermal stability. After plasma-catalyst reaction, the reducibility of CuO and Cu 2 O over supports decreased and the peak position of acid sites shifted to lower temperature.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Li Xiaoliang,Feng Jiangjiang,Sun Jia,Wang Zhe,Zhao Wei
TiO 2 (P25)-supported Au-Pd bimetal nanoparticles displayed excellent performance in the solvent-free benzyl alcohol catalytic oxidation. However, little research attention has been paid to investigate the effects of TiO 2 form on the catalytic activity of Au-Pd/TiO 2 . In the present research, rutile, brookite, and anatase TiO 2 were successfully synthesized and subsequently applied as the carrier to load Au-Pd nanoparticles by the deposition-precipitation method. The experimental results indicated that the benzyl alcohol conversion employing the rutile TiO 2 -supported Au-Pd catalyst is higher than the conversion of anatase and brookite TiO 2 -loaded Au-Pd catalysts. However, the Au-Pd/TiO 2 -rutile displayed the lowest and highest selectivity toward benzaldehyde and toluene, respectively. ICP-AES, XRD, XPS, and TEM were conducted to characterize these catalysts. The corresponding experimental results revealed that the excellent performance of Au-Pd/TiO 2 -rutile catalyst was attributed to both the smaller Au-Pd nanoparticle size distribution and the higher concentrations of O α and Pd 2+ species on the catalyst surface. In the recycle experiments, the Au-Pd/TiO 2 -rutile catalyst displayed lower reaction stability compared with the Au-Pd/TiO 2 -anatase and Au-Pd/TiO 2 -brookite, which might be due to the coverage of larger amount of aldehyde products on the surface.
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高影响因子
RSC Advances
·
2025
·Vol. 15
·期 26
·21156
·
IF 4.6
Shaojie Hong,Fanhua Yu,Bin Guo,Xiangqian Ren,Xingfu Zhou
In recent years, “green synthesis” technology has emerged at the research forefront of the chemical industry as an environmentally friendly approach. As a new and effective chemical synthesis method, organic electrochemical synthesis technology has attracted increasing attention. In this paper, the sol–gel method is used to fabricate a Y-doped Ti/TiO 2 electrode. By adding different concentrations of Y ions, the macropore morphology of the film becomes more obvious, and substrate cracks are improved to a certain extent. EIS tests show that a 0.006-Y electrode exhibits lower charge-transfer resistance. Furthermore, linear voltammetry (LSV) analysis showed that the hydrogen evolution potential of the Y-doped Ti/TiO 2 film electrode was improved. At the optimal Y/Ti molar ratio of 0.006, hydrogen evolution potential reached −1.22 V, showing a −0.19 V shift compared with the undoped electrode, and the hydrogen evolution side reaction was effectively inhibited. Cyclic voltammetry (CV) tests show that the reduction peak current density in maleic acid solution is as high as 210 mA cm −2 , which is 1.7 times that of the undoped electrode, indicating that the addition of Y at trace concentrations improves the electrocatalytic reduction performance of the electrode. Considering that the cathode can reduce maleic acid at lower potential and has higher catalytic activity, cathode potential is controlled within the range of −0.6–1.2 V for the electrosynthesis of succinic acid. When the optimized reaction temperature is 50 °C, the electrosynthesis yield for succinic acid reaches 91%, and the current efficiency reaches 96.3%. Y-doped Ti/TiO 2 electrodes were prepared for succinic acid electrosynthesis. Y doping enhanced electrocatalytic reduction, achieving 91% yield and 96.3% current efficiency at 50 °C.
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PubMed
高影响因子
ACS Nano
·
2025
·
IF 16
Qianyi Cheng,Chuyue Qiao,Yu Chen,Shaopeng Fu,Jianxian Zhou,Xiangyu Chen,Zhixun Wang,Jianfeng Li,Lei Wei,Qichong Zhang
The development of high-performance blue-light-sensitive photodetectors for underwater applications faces significant challenges due to the limited absorption range and inefficient charge separation in conventional semiconductor materials. Here, we design a TiO2@CdS core–shell heterojunction that synergistically combines the advantages of both materials, significantly enhancing blue-light absorption (450–495 nm) and charge carrier separation efficiency. The resulting fiber-shaped photoelectrochemical photodetector (FPPD) displays exceptional performance with a high responsivity of 101.87 mA W–1, fast response time of <19 ms, and outstanding mechanical flexibility. Furthermore, our FPPD exhibits biomimetic synaptic functionalities including bilingual responses, short-term plasticity, and low energy consumption comparable to that of biological synapses, enabling neuromorphic information perception and computing capabilities. Practical applications in underwater optical communication, imaging, and human–machine interaction are successfully demonstrated, highlighting the FPPD’s versatility in underwater environments. This work not only advances the design of high-performance underwater optoelectronic devices but also establishes a direct connection between traditional photodetection and emerging neuromorphic computing, laying the groundwork for innovative underwater systems and wearable technologies.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Fuying Li,Quan Gu,Yu Niu,Renzhang Wang,Yuecong Tong,Shuying Zhu,Hualei Zhang,Zizhong Zhang,Xuxu Wang
Pt nanoparticles were loaded on anatase TiO 2 by the photodeposition method to investigate their photocatalytic activity for H 2 evolution in an aqueous solution containing a certain amount of ethylene glycol (EG) as the sacrificial agent. The surface properties and chemical states of the Pt/TiO 2 sample were characterized by X-ray powder diffraction analysis, Brunauer–Emmett–Teller surface area analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and electrochemical resistance. The aqueous-phase photocatalytic EG reforming using Pt/TiO 2 and anatase TiO 2 generated not only H 2 and CO 2 , but also CO, CH 4 , C 2 H 6 , and C 2 H 4 . Moreover, the amount of formate and acetate complexes in the solution increased gradually. The EG adsorption and gas-phase intermediates during photocatalytic reaction processes were investigated by the in situ FTIR spectrum. Finally, the photocatalytic EG reforming reaction mechanism was elucidated. This helped to better understand the role of a sacrificial agent in a photocatalytic hydrogen production.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongying Cheng,Song Liu,Cuiying Hu,Hongxia Wang
A novel flower-like film composed of uniform hollow TiO 2 -NH 2 nano-shell (HTNs), luminol and aniline was synthesized by electro-copolymerization method in acidic ionic liquid EmimCl (IL, 1-ethyl-3-methylimidazolium chloride). The surficial morphology of the film was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), selected-area electron diffraction (SAED) and atomic force microscope (AFM), which showed the polycrystalline property. Its copolymerization mechanism was discussed in detail, which presented symmetric arrangement. The most obvious multiple increase of peak current in CV indicated the conjugate of HTNs in luminol structure and in aromatic ring skeleton. This film with excellent electrocatalysis performance used for nonelectroactive acetochlor (ACT) detection showed the lowest catalytic potential. Some important parameters were optimized for a homogeneous film and for a sensitive detection. On the optimum film, the electrocatalysis sensor exhibited a linear response within the concentration range of ACT from 2.0×10 −7 M to 1.5×10 −5 M, and an absolute detection limit of 0.15×10 -9 M at a signal-to-noise ratio of 3. Then the proposed method was used for the detection of ACT residue in the real strawberry sample with good results. The promising sensor presents good reproducibility and stability, providing a new fast and sensitive method for the analysis of real samples in environment.
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高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Yuyang Yao,Yueyue Lu,Jingwen Xu,Jiacheng Yu,Liang Guo,Heda Ding,Jian Li,Junbin Liao,Edison Huixiang Ang,Zhenlu Shen,Jiangnan Shen
Membrane-contamination during electrodialysis (ED) process is still a non-negligible challenge, while irreversible consumption and unsustainability have become the main bottlenecks limiting the improvement of anion exchange membranes (AEMs) anti-contamination activity. Here, we introduce a novel approach to design AEMs by chemically assembling 4-pyndinepropanol with bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) in an electrochromic-inspired process. Subsequently, the co-mingled TiO 2 @Ag nanosheet with the casting-solution were sprayed onto the surface of the substrate membrane to create a micrometer-thick interfacial layer. The addition of Ag nanoparticles (NPs) enhances the active sites of TiO 2 , resulting in stronger local surface plasmon resonance (LSPR) effects and reducing its energy band gap limitation (From 3.11 to 2.63 eV). Post-electrodialysis electrochromic AEMs incorporating TiO 2 @Ag exhibit synergistic enhancement of sunlight absorption, effectively suppressing photogenerated carrier binding and promoting migration. These resultant-membranes demonstrate significantly improved bacterial inhibition properties (42.0-fold increase for E. coli ) and degradation activity (7.59-fold increase for rhodamine B) compared to pure TiO 2 membranes. Importantly, they maintain photocatalytic activity without compromising salt-separation performance or stability, as the spraying process utilizes the same substrate materials. This approach to rational design and regulation of anti-contamination AEMs offers new insights into the collaborative synergy of color-changing and photocatalytic materials.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiejie Bai,Yue Shi,Aixin Ma,Feifei Liu,Yanru Liu,Caixia Li,Jianping Lai,Lei Wang
The production of three separated, high-value chemicals (H 2 O 2 , urea and H 2 ) from CO 2 , N 2 , and H 2 O represents a significant challenge. It is a prospective and innovative way to simultaneously produce these chemicals in an anion exchange membrane (AEM) electrolyzer, which couples anodic 2e - water oxidation (2e - WOR) and cathodic CO 2 , N 2 and water reduction reaction (CNWRR), but has not yet been realized. Here, we found that bifunctional Cu x Ti 1-x O 2-y catalysts can be employed in the electrochemical production of H 2 O 2 , urea and H 2 from CO 2 , N 2 and water, and the optimized Cu 0.12 Ti 0.88 O 2-y catalyst exhibits an excellent productivity of 11.8 μmol cm −2 min −1 , 0.3 mg cm -2 h −1 and 0.82 mmol cm -2 h −1 for H 2 O 2 , urea and H 2 at 4.0 V (50 mA cm −2 ) in AEM electrolyzer, respectively. Theoretical calculations reveal that the superior performance of the 2e - WOR and CNWRR is attributed to the Cu doping effect, which not only promotes the coupling of *OH but also optimizes the adsorption energy barriers of COOH* and NNH*. It is worth noting that the AEM electrolyzer assembled by bifunctional Cu 0.12 Ti 0.88 O 2-y reaches a current density of 50 mA cm −2 with a cell voltage of 4.0 V and exhibits excellent stability of 50-hour continuous operation.
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