CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Rui Li,Huanyu Zhang,Rongxia Chai,Mei Zhang,Min Guo
Well oriented TiO 2 nanorod arrays (TNRAs), served as an electron transmission carrier, have become the hotspot in perovskite solar cells (PSCs) for providing the direct channel for efficient charge transport and facilitating the pore filling of perovskite . However, the interfacial contact between perovskite film and TNRAs is one of the main factors that restricts the power conversion efficiency (PCE) of TNRAs based PSCs at present. In this paper, by employing a two-step spin-coating method, the influence of PbI 2 solvent such as PbI 2 /DMSO + ACN and PbI 2 /DMSO + DMF + HAc solutions, on the preparation and performance of TNRAs based PSCs was intensively investigated. More importantly, the relationship between the micro-characteristics of perovskite film, especially the interfacial contact between perovskite film and TNRAs, and macro-properties of PSCs was elucidated. Experimental results indicate that two compact perovskite films with similar large grain size were synthesized on TNRAs from the two different PbI 2 solvents, which leads to similar short circuit current densities ( J sc ). However, the PSC from PbI 2 /DMSO + DMF + HAc solution shows a larger V oc of 1.10 V compared with that from PbI 2 /DMSO + ACN solution, and thus a higher PCE of 16.57% was achieved under natural ambient conditions. The key reasons for the enhanced performance may be ascribed to the faster electron extraction and larger electron recombination resistance in the PSC, which mainly depends on the nature of perovskite/TNRAs interfaces.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Hongqiang Shen,DanDan Shang,Longhua Li,Di Li,Weidong Shi
Full solar-energy utilization and sufficient charge flow supply are highly desired for the rational design over efficient heterojunction photocatalyst. Herein, we introduced 2D Schiff-base covalent-organic frameworks material (COF-TpPa-1) as a photosensitizer and support to integrate with 2D TiO 2 nanosheets of H 2 -evolving semiconductor, establishing a 2D/2D hybrid photosensitive system. The 2D/2D COF-TpPa-1/TiO 2 heterogeneous composite displayed the optimum yield of 1.37 mmol h −1 g −1 under visible light irradiation, which is ∼ 29 times higher than that of pristine COF-TpPa-1. Furthermore, the mass short-distance photoelectron flow through the intimate hetero-interface contact between 2D COF-TpPa-1 and 2D TiO 2 has been evidenced by various characterizations and DFT calculations. This work reported here enables the extension of various 2D/2D hybrid collocations between H 2 -evolving metal oxide semiconductors and photosensitizing COF materials for boosting photocatalytic performance.
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Wei Li,Xuesen Du,Zhi Li,Yaqin Tao,Jingyu Xue,Yanrong Chen,Zhongqing Yang,Jingyu Ran,Vladislav Rac,Vesna Rakić
Vanadia-based catalysts are widely used in selective catalytic reduction (SCR) reaction for reducing nitrogen oxides emissions, however, they only exhibit sufficient DeNO x efficiency within a narrow temperature window. In this study, a catalyst embedded with electrothermal alloy was prepared. The catalyst surface temperature could be heated using the electrothermal alloy, in order to widen the operating temperature window of the V 2 O 5 -WO 3 /TiO 2 catalyst. Experimental results revealed that the electrothermal alloy embedded V 2 O 5 -WO 3 /TiO 2 catalyst can maintain superior NH 3 -SCR performance and high resistance to H 2 O in a wide gas temperature range of 100–400 °C by controlling the surface temperature. In the meantime, the NH 4 HSO 4 poisoned catalyst could be efficiently regenerated through electric heating, and NO x conversion can be restored to the level of fresh samples. Additionally, the effect of additives including methylcellulose and glass fiber , on the physicochemical properties of the plate-type catalyst was also investigated, and the catalyst samples were characterized by means of BET, XRD , NH 3 -TPD, H 2 -TPR, TG and SEM-EDS. This study proves the electric heating strategy is a promising way to enhance the performance of the V 2 O 5 -WO 3 /TiO 2 during wide temperature SCR applications.
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高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Chunquan Li,Zhiming Sun,Xiongbo Dong,Shuilin Zheng,Dionysios D. Dionysiou
In this study, sol-gel method modified with acetic acid (CH 3 COOH) was employed to facilely synthesize hydrogen functionalized TiO 2 /kaolinite composite. Weak acid (CH 3 COOH) was used to modify the surface of TiO 2 /kaolinite composite in order to activate TiO 2 surface and generate more hydroxyl groups. The modified surface can act as Lewis acid sites to allow the physisorption of uncharged carboxyl acid groups, which is believed to be beneficial for electron injection and transfer. Using ciprofloxacin (CIP) as the target pollutant, in comparison with the use of strong acid such as hydrochloric acid (HCl) or sulfuric acid (H 2 SO 4 ), it was found that CH 3 COOH functionalized TiO 2 /kaolinite composite possessed the strongest adsorption ability and exhibited highest degradation efficiency under broad spectrum (200–800 nm). Moreover, the concentration of CH 3 COOH required is low (0.1 mol/L) in this work. The results show that the CH 3 COOH treated sample exhibited much higher degradation rates than bare TiO 2 or TiO 2 /kaolinite composite under both UV light and visible light. The kinetic constants under UV light were almost 2.61 and 1.57 times higher than those of TiO 2 and TiO 2 /kaolinite, respectively. According to the X-ray diffraction (XRD), N 2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR) as well as Raman characterization results, it is revealed that the improved photocatalytic activity can be mainly attributed to the CH 3 COOH functionalization towards the TiO 2 /kaolinite composite. Furthermore, density functional theory (DFT) calculations were employed to explore the interface effect between TiO 2 and kaolinite as well as the function of newly introduced hydrogen on the surface of the composite, which significantly contributes to better understanding the function of CH 3 COOH in the constructed system. On the other hand, electron spin resonance (ESR) analysis suggests that the main oxidation species in the degradation process under broad light spectrum illumination was the holes. This study also provides information about the enhancement mechanism. New insights in photocatalysts synthesis and properties adjustment based on natural minerals for the elimination of organic contaminants of emerging concern in water was successfully introduced in the present study.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Donghai Wei,Yinglong Wu,Yan Nie,Junfei Duan,Chenhao Cao,Jianghong Wu,Lingjun Li,Zhaoyong Chen,Guanhua Zhang,Huigao Duan
Red phosphorus (RP), as one of the most promising anode materials for lithium-ion batteries, attracts much attention for its high theoretical specific capacity, cost-effective, and commercial availability. However, poor cycling stability and rate capability caused by huge volume expansion and low intrinsic electronic conductivity hinder the commercialization of RP-based anode. Herein, RP confined in ultrathin hollow carbon-bubble-constructed foam (RP-HC) is developed to improve electronic conductivity and mechanical structure stability. Additionally, low-temperature atomic layer deposition (LT-ALD) technology is adopted to further modify the surface of the RP-HC, forming a core–shell RP-HC@TiO 2 structure with about 5 nm TiO 2 coating layer. Benefiting from the dual confinement of TiO 2 buffer layer and conductive porous carbon host with effective P O C bond, the RP-HC(70%)@TiO 2 electrode delivers an outstanding cycling performance (795.2 mAh g −1 after 200 cycles at 100 mA g −1 ) and rate capability (459.9 mAh g −1 at 2000 mA g −1 , almost 1.6 times and 12 times relative to RP-HC(70%) and RP under the same test condition). In-situ electrochemical impedance spectroscopy analyses are also conducted to investigate the superior Li + storage properties of the RP-HC@TiO 2 .
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Junhua Hu,Lijie Wang,Peng Zhang,Changhao Liang,Guosheng Shao
Carbon-layer-coated TiO 2 /WO 3 nanofibers (WTC) were fabricated by combining the electrospinning technique (for TiO 2 /WO 3 nanofibers) and hydrothermal method (for carbon shell). The structure characterization results showed that TiO 2 /WO 3 nanofibers (WT) were encased within an uniform carbon shell about 10 nm in thickness. By adjusting the content of WO 3 , the graphitization degree of carbon layer could be controlled, and the WTC nanofibers had remarkable light absorption in the visible region. Furthermore, the photoelectrochemical performance and photocatalytic activity were investigated systematically. As expected, the H 2 -generation rate of the as-prepared composite materials was greatly enhanced compared with pure TiO 2 nanofibers (TNFs), TiO 2 /WO 3 nanofibers (WT) and TiO 2 @carbon core/shell nanofibers (TC). The enhanced activities were mainly attributed to the multichannel-improved charge-carrier photosynthetic heterojunction system with the carbon layer on the surface of TiO 2 as an electron collector and WO 3 as a hole collector, leading to effective charge separation on these components, which were evidenced by photoluminescence spectroscopy (PL), electrochemical impedance spectroscopy (EIS) and photocurrent analysis. Besides, the addition of WO 3 promoted the graphitization of carbon layer, which in turn improved transport of electrons in the carbon layer and also contributed to the performance improvement.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·116513
·
IF 4.316
Yuanyuan Jiang,Rajesh Pathak,Tiansheng Zhang,Haibin Xu,Xiaoyi Li,Ronghua Jian,Fan Wu
The solution-processed TiO2/BiFeO3/BiOI ternary heterojunction with cascade energy level alignments was developed for photoelectrochemical conversion, in which, BiOI was deposited on BiFeO3 sensitized TiO2 mesoporous film by spin-coating method. BiFeO3 as ferroelectric material was served here as a mediator for improvement of charge separation and transfer. The photocurrent generation in TiO2/BiFeO3/BiOI sample are very stable, even measured after 50 light on/off cycles with 2000 s. Moreover, compared with the TiO2/BiOI film, TiO2/BiFeO3/BiOI film showed about twice as high photocurrent density and photocatalytic activity. Kelvin probe force microscope showed that the surface potential of TiO2/BiFeO3/BiOI film was 0.456 V, which was obviously larger than 0.226 V in TiO2/BiOI sample. The increased surface potential should originate from the polarization electric-field Eself by BiFeO3 interlayer, in which the direction of electric-field was directed toward the BiOI. The presence of Eself consequently resulted in the better dissociation of photo-generated electrons and holes. Charge transport dynamics suggested that charge transfer rate increased from 6.813 s−1 of TiO2/BiOI heterojunction to 22.280 s−1 of TiO2/BiFeO3/BiOI heterojunction, and surface charge recombination rate reduced from 10.305 s−1 of the TiO2/BiOI to 7.707 s−1 of TiO2/BiFeO3/BiOI heterojunction, which results in the enhanced photoelectrochemical conversion in TiO2/BiFeO3/BiOI heterojunction.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Guangjian Peng,Yahao Hu,Guijing Dou,Yiheng Sun,Yong Huan,Sung Hoon Kang,Zhongyu Piao
Microencapsulated phase change materials (MPCMs) are often mixed with matrix materials to form phase change composites for energy storage. Typically, MPCMs are easily debonded from the matrix or ruptured, thereby weakening the mechanical properties of composites. This paper aims to simultaneously improve the rupture strength of microcapsules and the bonding strength between microcapsules and matrix to enhance the mechanical properties of composites. The titanium dioxide (TiO 2 ) nanoparticles modified by a silane coupling agent (KH560) were doped into the melamine formaldehyde (MF) shell, forming n-octadecane@MF/TiO 2 hybrid shell MPCMs (HS-MPCMs). The doping of modified TiO 2 nanoparticles reduced supercooling and improved the thermal stability of microcapsules. Compared with MF microcapsules, the rupture strength of HS-MPCMs was increased by an average of 30.4%. The modified TiO 2 nanoparticles also built covalent bonds between microcapsule shell and matrix, which led to better microcapsule/epoxy interface bonding. Thus, the HS-MPCMs/epoxy composites performed higher tensile strength than the unmodified composites. Specifically, the tensile strength of composites was improved by an average of 17.2% at the microcapsule content of 10 wt.% with the aid of the MF/TiO 2 hybrid shell. The reinforced MPCMs/epoxy composites are expected to be used as anti-icing coatings in the aerospace field.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Cheng Ma,Jinfang Zhang,Mingquan Xu,Qingbing Xia,Jiatu Liu,Shuai Zhao,Libao Chen,Anqiang Pan,Douglas G. Ivey,Weifeng Wei
Nanohybrid polymer electrolytes (NHPE) with ceramic particles have attracted significant attention owing to their improvement in electrochemical performance. However, particle aggregation and weak nanoparticle/polymer matrix interaction restrict their further application in lithium-ion batteries (LIBs). We demonstrate a facile in-situ polymerization/crystallization method to synthesize a homogeneous TiO 2 -grafted NHPE with a cross-linked branching structure, comprised of ion-conducting poly(ethylene glycol) methyl ether methacrylate (PEGMEM) and non-polar stearyl methacrylate (SMA). This technique is different from existing methods of blending functionalized ceramic particles into the polymer matrix . Highly monodispersed TiO 2 nanocrystals enhance the effective interfacial interactions between particles and polymer matrix , which suppress the crystallization of ethylene oxide (EO) groups and facilitate forming continuously interconnected ion-conducting channels. Moreover, an increased dissociation degree of Li salt can also be achieved. The TiO 2 -grafted NHPE exhibits superior electrochemical properties with an ionic conductivity of 1.1 × 10 −4 S cm −1 at 30 °C, a high lithium ion transference number and excellent interfacial compatibility with the lithium electrode. In particular, a lithium-ion battery based on TiO 2 -grafted NHPE demonstrates good C-rate performance, as well as excellent cycling stability with an initial discharge capacity of 153.5 mAh g −1 and a capacity retention of 96% after 300 cycles at 1 C (80 °C).
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高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 9
·2102001
·
IF 6.389
Jianlin Zhou,Han Liu,Yangyi Sun,Kunlin Chen
The study reports the successful fabrication of a novel dual self-healing anticorrosion coating based on benzotriazole loaded TiO 2 nanocapsule (BTC) modified graphene oxide sheets and the multibranched waterborne polyurethane (WPU). When corrosion occurs, the benzotriazole (BZT) in nanocapsules can be slowly released from the coating forming a passivation layer on the metal surface to isolate the corrosive mediums. The anticorrosion performance of coating is examined by performing electrochemical tests. As indicated from the results, after being immersed in 3.5 wt% NaCl for 7 d, the prepared coating shows excellent anticorrosion performance with inhibition efficiency of 99%. In addition, the φ in 10 4 Hz increases from 10° to 30°, and Log| Z | 0.01Hz remains at nearly 4.5 with the immersing time extended to 30 d. Moreover, when the coating is physically damaged, the damaged coating can be self-repaired by the reversible disulfide bonds in WPU and the releasing of the BZT simultaneously. Compared with other control anticorrosion coatings, the healed coating achieves significantly improved anticorrosion performance, and the damaged coating can still sustain the original anticorrosion performance after self-healing. This study proposes a novel fabrication strategy for self-healing materials, and it can contribute to the long-term use of anticorrosion coatings.
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高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Du Luchao,An Jie,Katayama Tetsuro,Duan Menghan,Shi XiaoPing,Wang Yunpeng,Furube Akihiro
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr 3 /TiO 2 composite systems with different Mn 2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn 2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn 2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn 2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn 2+ doping on the interface charge transfer process of the CsPbBr 3 /TiO 2 solar cell system.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Ning Shao,Jinnan Wang,Dadao Wang,Philippe Corvini
We synthesized novel three-dimensional photocatalyst (Ag 3 PO 4 /TiO 2 @MoS 2 ) with various content of TiO 2 @MoS 2 by electrospining, sequential hydrothermal reaction and chemical deposition. The optimal content of TiO 2 @MoS 2 in Ag 3 PO 4 /TiO 2 @MoS 2 composites is 3.5 wt%, and the bandgap of Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) (1.85 eV) was much lower than that of pure Ag 3 PO 4 (2.45 eV). Due to high conductivity of TiO 2 @MoS 2 heterostructure, the separation efficiency of electron-hole pairs of Ag 3 PO 4 was significantly improved so that Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) presented higher photocatalytic activity. More than 92% Methyl orange and Methylene blue were photodegraded over Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) in 12 min and 5 min, respectively. More importantly,TiO 2 @MoS 2 could play the role of ‘wire’ to guide electrons captured by MoS 2 and quickly transferred electrons into solution so that the recombination of electron-hole pairs and the reduction of silver irons were effectively restrained. Thus, Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) exhibited excellent anti-photocorrosion performance. Even after 10 cycling runs, Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) could degrade 75% and 92% of oxytetracycline and enrofloxacin, respectively, whereas Ag 3 PO 4 degraded 23% and 44%. In addition, the possible photodegradation pathways of oxytetracycline and enrofloxacin were proposed, demonstrating that the photodegradation mechanisms involving oxidizing/shedding of functional groups firstly and opening the ring sequentially. Further detection of reactive oxidative species indicated that holes were the main active oxidizing species involved in the photocatalytic reaction process. Thus, Ag 3 PO 4 /TiO 2 @MoS 2 (3.5 wt%) is a promising photocatalyst for photodegradation of organic pollutants in the environmental protection.
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高影响因子
危险品化学品经营许可证（带存储）