APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanling Weng,Azhar Ali Haidry,Jintao Long,Adil Raza,Muhammad Yasir,Muhammad Kashif
In this study, we successfully synthesized TiO 2 micro-flowers (T-MFs) and investigated their performance in humidity sensing. The T-MFs possess a unique three-dimensional petal morphology with a large surface area and high crystallinity. The T-MFs-based humidity sensors demonstrated the highest sensor response of S R ∼ 1 × 10 7 , significantly outperforming TiO 2 nano-discs (T-NDs) with S R ∼ 1 × 10 5 , and TiO 2 nano-particles (T-NPs) with S R ∼ 9 × 10 4 . These findings highlight the superior sensitivity of T-MFs-based sensors in terms of response, regardless of the humidity level. The sensors exhibit remarkable linearity (R 2 > 0.98), minimal hysteresis (0.4 %), and exceptional repeatability and reproducibility (verified through six cycles at 44 % RH and 90 % RH). Additionally, T-MFs showed long-term stability in aging tests conducted over 100 days at humidity levels ranging from 9 to 90 RH%. These results indicate that T-MFs have potential advantages in high-performance humidity sensing applications and provide new opportunities for the development of breath analyzers.
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2020
·Vol. 93
·期 10
·1553-1560
·
IF 0.69
Wang Keyan,Du Liyong,Liu Xinfang,Ding Yuqiang
Abstract A cerium compound with asymmetric amidinate ligands [Ce( i PrNC(Me)N t Bu) 3 ] has been reported and characterized in this paper. The compound showed good volatility and thermal stability, which were evaluated by TGA (thermogravimetric analysis). Corresponding results indicated the great potential of this compound for the chemical vapor deposition (CVD) process. Therefore, CeO x film and particle (loaded on TiO 2 ) deposition were conducted by CVD using Ce( i PrNC(Me)N t Bu) 3 and O 2 as precursors. Meanwhile, the photocatalytic activity of the CVD CeO x –TiO 2 composite was evaluated by degrading methylene blue solution under the irradiation of ultraviolet light (365 nm).
研究领域:
材料科学
·
化学工程
·
催化
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2023
·Vol. 41
·期 2
·354-367
·
IF 1.1
Biyang Tuo,Xiulong Shi,Jinwang Tian,Jianli Wang
To broaden the light response range of TiO2 and improve its photocatalytic activity, BiOCl/TiO2/MMT composite materials (BTMC) with outstanding photocatalytic performance were prepared by the sol-gel method with montmorillonite (MMT) as the supporting material, tetrabutyl titanate as titanium source and, bismuth nitrate pentahydrate as the bismuth source. The properties of the prepared materials were characterized by X-ray diffractometer (XRD), surface and porosity analysis (BET), scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), and ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS). When the Bi/Ti molar ratio was 20%, the composite material exhibited a slit mesoporous structure, and its specific surface area was 109.02 m2/g, with optimum photocatalytic activity. TiO2 and BiOCl formed the type-II heterojunction on the surface of MMT, which facilitates the transfer of photogenerated electrons and holes, thus enhancing the photocatalytic activity of BTMC-20. The results of this study indicated that BTMC-20 is a promising photocatalytic composite material and has better photocatalytic properties under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 9
·1356-1362
·
IF 1.889
Xu Jianxiong,Xie Shaowen,Feng Yahui,Du Jingjing,Xu Lijian
TiO2 nanoparticles with average diameter of 510 nm were prepared by sol–gel surfactants, and the hierarchically nanoporous Ti–SiO2 particles were further prepared using in-situ method. The hierarchically nanoporous Ti–SiO2 particles
with hollow structure were analyzed by transmission electron microscope (TEM), energy dispersive spectrometer (EDS), scanning electron microscope (SEM), nitrogen adsorption stripping curves and Barrett-Joyner-Halenda (BJH) pore size distribution curves. Finally, the hierarchically nanoporous
Ni–Mo composite electrodes were prepared using the TiO2 nanoparticles or nanoporous Ti–SiO2 particles as composite particles respectively, and the influence of the concentration of composite particles on the electrocatalytic activities of Ni–Mo composite
electrodes for hydrogen evolution were investigated by polarization curves. The results showed that the diameter of Ti–SiO2 particles was from 200 nm to 500 nm, and specific surface area was 573 m2/g with pore volume of 1.19 cm3/g and mesopore size of
3.2 nm. The TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were fabricated by electrodeposition with TiO2 nanoparticles and nanoporous Ti–SiO2 particles as composite particles respectively. The electrocatalytic activities
of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen evolution were investigated. Results showed that the electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes for hydrogen
evolution reached the optimal value when the concentration of particles was 4 g/L and 2 g/L respectively. The electrocatalytic activities of TiO2/Ni–Mo and Ti–SiO2/Ni–Mo composite electrodes were greater than that of Ni–Mo alloy electrode, and
the Ti–SiO2/Ni–Mo composite electrode showed the best electrocatalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2020
·Vol. 16
·期 1
·39-43
·
IF 0.975
Yawen Zhang,Yilu Bai,Lanlan Ye,Ting Li,Rui Chen,Hong Jin,Hongyan Xia,Hui Xu
In order to improve the rate performance and reduce the cost lithium ion anode, the Li 4 Ti 5 O 12 @TiO 2 (LTO-TO) was prepared by a facile hydrothermal reaction method with a micro-scale TiO 2 as the precursor. The morphologies and microstructures of the pomegranate-like LTO-TO were examined by scanning electron microscopy and transition electron microscopy. The results demonstrate that the nano-LTO particles are located on the surface of the micro TiO 2 . The electrochemical properties of the LTO-TO composites were characterized by galvanostatic charge/discharge. The as-prepared composites present a high capacity of 157.3 mAh g −1 at 0.5 C. Even at a high current density of 10 C, it can still maintain a high capacity of 105.4 mAh g −1 and remains 92.8% (95 mA g −1 ) after 450 cycles. These results indicate that the as-prepared LTO nano/micro-sphere may be a potential anode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Qijun Pei,Teng He,Yang Yu,Zijun Jing,Jianping Guo,Lin Liu,Zhitao Xiong,Ping Chen
The strong metal–support interaction (SMSI) is of significant importance to heterogeneous catalysis. The electronic modification and encapsulation of active metals by reducible supports are the intrinsic properties of the SMSI, where the latter would decrease or even cease the catalytic activity of transition metals. Here, we demonstrate for the first time that alkalies are the functional additives that can effectively manipulate the SMSI for better hydrogenation catalysis. Specifically, both thermodynamic analyses and experimental results show that the addition of alkalies to the Ru/TiO2 catalyst could form a titanate top layer that effectively hampers the migration of TiO2–x to the surface of Ru nanoparticles. In the meantime, a substantially enhanced reduction of the support is achieved, leading to an even stronger electron donation from the support to Ru. The alkali-modified Ru/TiO2 exhibits superior low-temperature catalytic activity in the hydrogenation of aromatics, which is ca. an order of magnitude higher than that of the commercial Ru/Al2O3 catalyst and is in clear contrast to that of the neat Ru/TiO2 catalyst that shows negligible activity due to the severe encapsulation of Ru by TiO2–x.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Micro & Nano Letters
·
2014
·Vol. 9
·期 3
·193-197
·
IF 0.799
Fan Yang,Xiaojie Song,Lifeng Yan,Wenmei Wei
Three-dimensional cellulose gel was prepared by a crosslinking of the cellulose chains using epichlorohydrin in the presence of the NH 4 OH, and the TiO 2 nanoparticles which were fixed on the surface of cellulose gel to form microcrystalline cellulose gel/nanoTiO 2 composites (MCC-TiO 2 ). The composites were characterised by means of X-ray diffraction, thermogravimetric analysis and scanning electron microscopy, respectively. The composites showed an efficient removal of methyl orange (MO) from their aqueous solution, and a two-step mechanism is involved. At first, the MO molecules were enriched on the surface of the MCC-TiO 2 by absorption, and then they were degraded there via photocatalysis, and the degradation of the adsorbed MO promoted the further adsorption of MO from the solution. After 30 min, 94% of MO was removed, and the MCC-TiO 2 can be cleaned by itself and reused without additional treatments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Siyu Tan,Zipeng Xing,Jiaqi Zhang,Zhenzi Li,Xiaoyan Wu,Jiayi Cui,Junyan Kuang,Qi Zhu,Wei Zhou
Ti 3+ self-doped TiO 2 /g-C 3 N 4 mesostructured nanosheets heterojunctions (Ti 3+ -TiO 2 /Meso-g-C 3 N 4 ) have been prepared via calcination-sonication assisted method using amino cyanamide as precursors, combined with a solid-state chemical reduction method. The Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions with narrow band gap of ∼2.21 eV possess relative high surface area of ∼73.8 m 2 g −1 , and large pore size of ∼10 nm. Remarkably, the Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions exhibit excellent visible-light-driven photocatalytic activity for degradating phenol in wastewaters. The photocatalytic hydrogen production rate of Ti 3+ -TiO 2 /Meso-g-C 3 N 4 heterojunctions rise to ∼290.2 μmol h −1 g −1 , which is about 4 and 14 times higher than that of the bare Meso-g-C 3 N 4 and TiO 2 , respectively. The enhanced photocatalytic activity may be ascribed to the synergetic effect of the mesoporous structure providing sufficient surface active sites, and Ti 3+ self-doping and the formed heterojunctions promoting the spatial separation of photogenerated electron-hole pairs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jun Chen,Yulong Wu,Kelin Zhu,Fang Sun,Chungang Guo,Xiaoling Wu,Guoan Cheng,Ruiting Zheng
Electrochemical nanomaterial-based resistive switching devices (memristors) have recently attracted significant research interest because of their low cost and potential applications in nonvolatile data storage and artificial neural networks . In this paper, we report an electrochemical method to produce a novel memristor based on copper nanowire-titanium dioxide nanotube arrays (TNTAs), a core-shell composite material. TNTAs are fabricated using a cheap and effective electrochemical anodization method, and high-density copper nanowires are synthesized via excess-electrodeposition with a novel peeling-off strategy. This novel memristor shows both analogue and digital resistive switching properties by controlling the electroforming process. The R off /R on ratio of the digital memristor remains greater than 40 during 1000 consecutive I–V sweeps. The device shows good endurance over 10 4 pulse cycles, with an R off /R on ratio greater than 20. Furthermore, the data retention time can be maintained at least for 10 4 s. The outstanding digital resistive switching performance can be attributed to the numerous parallel copper nanowire nanoelectrodes inside the film.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Xun He,Zixiao Li,Jie Yao,Kai Dong,Xiuhong Li,Long Hu,Shengjun Sun,Zhengwei Cai,Dongdong Zheng,Yongsong Luo,Binwu Ying,Mohamed S. Hamdy,Lisi Xie,Qian Liu,Xuping Sun
Electrochemical reduction of nitrite (NO 2 − ) can satisfy the necessity for NO 2 − contaminant removal and deliver a sustainable pathway for ammonia (NH 3 ) generation. Its practical application yet requires highly efficient electrocatalysts to boost NH 3 yield and Faradaic efficiency (FE). In this study, CoP nanoparticle-decorated TiO 2 nanoribbon array on Ti plate (CoP@TiO 2 /TP) is verified as a high-efficiency electrocatalyst for the selective reduction of NO 2 − to NH 3 . When measured in 0.1 M NaOH with NO 2 − , the freestanding CoP@TiO 2 /TP electrode delivers a large NH 3 yield of 849.57 μmol h −1 cm −2 and a high FE of 97.01% with good stability. Remarkably, the subsequently fabricated Zn–NO 2 − battery achieves a high power density of 1.24 mW cm −2 while delivering a NH 3 yield of 714.40 μg h −1 cm −2 .
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Qinghua Tian,Lingxiangyu Li,Jizhang Chen,Li Yang,Shin-ichi Hirano
Elaborate fabrication of state-of-the-art nanostructure SnO 2 @C-based composites greatly contributes to alleviate the huge volume expansion issue of the SnO 2 anodes. But the preparation processes of most of them are complicated and tedious, which is generally adverse to the development of SnO 2 @C-based composite anodes. Herein, a unique nanostructure of TiO 2 @SnO 2 @C hollow nanobelts (TiO 2 @SnO 2 @C HNBs), including the characteristics of one-dimensional architecture, sandwich protection, hollow structure, carbon coating, and a mechanically robust TiO 2 support, has been fabricated by a facile approach for the first time. As anodes for lithium-ion batteries, the as-fabricated TiO 2 @SnO 2 @C HNBs exhibit an outstanding lithium storage performance, delivering capacity of 804.6 and 384. 5 mAh g −1 at 200 and even 1000 mA g −1 after 500 cycles, respectively. It is demonstrated that thus outstanding performance is mainly attributed to the unique nanostructure of TiO 2 @SnO 2 @C HNBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2020
·Vol. 14
·期 2
·163-176
·
IF 1.747
Zhang Zhiyu,Hu Lixia,Zhang Hui,Yu Liping,Liang Yunxiao
Novel large-sized mesoporous nanofilm-constructed macroporous SiO 2 (LMNCMS) with two sets of well-defined 3D continuous pass-through macropores (pore size of 0.5–1.0 μm, wall thickness of 40–50 nm) was prepared through a dual-templating approach, and used as an advanced support for TiO 2 nanocrystalline photocatalyst. The structural and optical properties of the as-prepared materials were investigated by various characterization techniques in order to explore the connections between catalysts’ features and catalytic performance. The photocatalytic activities were evaluated by degradations of methylene blue (MB) and phenol under the simulated sunlight irradiation. To gain insight into the impact of preparation and operation conditions on photocatalytic degradation processes, experiments were conducted at wide ranges of the TiO 2 loading content, calcination temperature, solution pH, and photocatalyst dosage. Nano-TiO 2 /LMNCMS exhibited high photocatalytic activity and stability. Rapid matter transport, good accessibility of pollutants to TiO 2 and high light harvesting could mainly account for the superior photocatalytic performance. The trapping experiments were performed to identify the main reactive species in the catalytic reactions.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）