APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Hongwen Zhang,Lei Ma,Jintao Ming,Bingqian Liu,Yibo Zhao,Yidong Hou,Zhengxin Ding,Chao Xu,Zizhong Zhang,Jinlin Long
This work demonstrated the 12 fold-enhanced solar water splitting over the type-II core-shell nanostructured TiO 2 rutile photoanodes by orienting the charge flow and accelerating the hole transport to water-oxidation sites. Such nanoheterostructured photoanodes were designed rationally and prepared by a facile strategy to enwrapping an amorphous Ta 2 O x N y layer on surface of TiO 2 nanorods grown on the FTO glass substrates, consequently the incident photon-to-current conversion efficiency was increased from 2.2% to 22.6% in a two-electrode system under 390 nm light irradiation. The activity results showed that under AM 1.5 G illumination, the photocurrent output of TiO 2 @Ta 2 O x N y photoanodes reached a stable density of 1.32 mA cm −2 at 1.23 V vs RHE, and which is 12 times and ca. 4.3 times than that of the pristine TiO 2 and TiO 2 @Ta 2 O 5 counterparts, respectively. Correspondingly, the oxygen evolution rate was improved from 20.3 to 112.7 mmol m −2 h −1 . A solar-to-chemical energy conversion efficiency of ca. 1.49% was achieved at 1.23 V vs RHE.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SCRIPTA MATERIALIA
·
2020
·
IF 5.079
Guohua Fan,Zhongyang Wang,Huan Ren,Yao Liu,Runhua Fan
In this work, dielectric behaviors of dielectric resonance, relaxation, and plasma-like negative permittivity are observed in percolative copper/rutile cermets . Transition for permittivity changing from positive to negative is associated with composition and determined by percolation . The resonance and relaxation responses are related to isolated metallic particles or clusters. Negative permittivity is induced by the plasmonic state of electrons within percolating pathways and dielectric loss of epsilon-negative composites is dominated by conduction loss. Besides, the percolative cermets change from electrical capacitive to inductive with the permittivity transition. Epsilon-negative cermets are expected to be used for electromagnetic shielding and coil-less electrical inductors.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Maomiao Xiang,Jun Fu,Chenxi Huang,Yue Xing,Jiefu Zhang,Hualing Zeng,Xiang Shao
Monolayer transition-metal dichalcogenides (TMDs) have registered attractive potential applications in optoelectronics, spintronics, and valleytronics. Here, we develop a simple chemical vapor deposition method to directly grow large-size monolayer WS2 on an atomically flat rutile TiO2(110) substrate. The variety of microscopic and spectroscopic characterizations reveals the highly single crystallinity of the as-grown WS2 and the atomically clean WS2/TiO2 interface. Such structural perfection renders a neutral excitonic photoluminescence of WS2 with extremely small spectral broadening of around 20 meV at cryogenic temperature. Moreover, the low concentration of defect leads to the suppressed intervalley scattering, while the efficient interfacial electron transfer reduces the Coulomb interaction between the valleys of the WS2, which thus enhance the valley polarization and coherence significantly so that it can reserve up to room temperature under ambient conditions. These results demonstrate that the substrate tuning corroborated by interface control can be a promising strategy to utilize the TMDs in practical valleytronics.
研究领域:
材料科学
·
凝聚态物理
·
光学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Qun Liu,Yangdong Zhang,Xingyu Chen,Chunlin Zhao,Xiao Wu,Tengfei Lin,Zedong Xu,Min Gao,Cong Lin
TiO 2 is a promising photoelectrochemical (PEC) material as photoanodes for photoelectric conversion. However, severe charge recombination issues in TiO 2 significantly hinder the PEC efficiency and thus its application. It has been reported that the construction of rutile/anatase (R/A) heterophase junctions benefits fast charge transfer via interfaces and improves the efficiency of conversion. However, the evolution of R and/or A phases and their morphology and phase-transition effect on the PEC properties have not been investigated. In this study, unique TiO 2 heterophase junctions consisting of R-phase nanorods on the titanate-coexisting-phase (CO-phase) truncated octahedral particles were fabricated through a two-step hydrothermal method, where the morphology and phase transition of a titanate-coexisting phase was meticulously controlled and carefully monitored. The heterophase junctions exhibited superior PEC performances with a photocurrent density of 1.62 ± 0.05 mA cm −2 at 1.23 V, which was 4.3 times and 1.6 times greater than that of pure R phase and R-nanorod/A-nanosheet, respectively. This work demonstrates the potential of morphology engineering and phase transition of photoanodes for highly efficient photoelectric conversion.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Synthesis
·
2025
·
IF 20
Wang Ruizhao,Dai Jie,Zhao Long,Hu Zhiwei,Chen Chien-Te,Kuo Chang-Yang,Zhan Guangming,Shi Yanbiao,Wang Jiaxian,Zou Yunjie,Xu Mingkai,Zou Xingyue,Zheng Qian,Zhou Bing,Wang Kaiyuan,Zhao Rui,Zhang Yan,Shen Yunhao,Yao Yancai,Zhang Lizhi
Electrochemical O 2 activation offers a green approach for efficient synthesis of singlet oxygen ( 1 O 2 ). However, it is commonly determined by adsorption-dependent O 2 activation and transformation and can suffer from the sluggish desorption of surface-bound *OOH. Here we report an adsorption-independent O 2 activation pathway for 1 O 2 electrosynthesis via an O 2 mono-hydrogenation process on compressive-strained rutile TiO 2 (CSR-TiO 2 ). This CSR-TiO 2 achieved an 1 O 2 generation rate of 148.26 μmol l −1 min −1 with near 100% Faradaic efficiency, outperforming the strain-free counterpart (35.97 μmol l −1 min −1 ) and other previously reported materials. Such superior performance of CSR-TiO 2 stemmed from compressive strain, which can suppress the formation of reductive unsaturated sites for the O 2 adsorption and enhance the reductive ability of atomic hydrogen (H*), favouring the O 2 mono-hydrogenation pathway and bypassing the traditional surface-bound *OOH desorption pathway. The generated 1 O 2 could be utilized for the selective oxidation of thioanisole and its derivatives, offering a promising strategy for green organic synthesis.
研究领域:
材料科学
·
电化学
·
绿色合成
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Yayun Pu,Qianwen Chen,Zongzhao Sun,Paramaconi Rodriguez,Limin Huang
In this study, phase transformations from lepidocrocite titania (L-TiO2) nanosheets to rutile (R-TiO2) and anatase (A-TiO2) have been systematically investigated as a function of the preparation conditions, such as pH and freeze-drying, and as a function of the temperature treatment. We have found that the transformation of (L-TiO2) into rutile takes place upon freeze-drying treatment. We report that temperature determined the final phase structure in the transition phase of the L-TiO2 nanosheets into TiO2 nanoparticles, while the pH determined the final morphology and particle size. On the basis of the experimental results, two different transition pathways of dissolution–recrystallization and topologically rolling transition have been proposed. Our results give a full map of phase transition and morphology evolution of L-TiO2 to R-TiO2/A-TiO2 that can provide guideline to new materials design, especially for photocatalysts.
研究领域:
材料科学
·
纳米技术
·
光催化
·
无机化学
✓ 已验证
DOI
高影响因子
PeerJ
·
2019
·
IF 2.353
Weilong Zhang,Yang Wu,Jin Wang,Juan Liu,Haifeng Lu,Shuijing Zhai,Qiaohui Zhong,Siyu Liu,Wanying Zhong,Chunling Huang,Xiaoxiang Yu,Wenhui Zhang,Yongheng Chen
Rutile nano-titanium dioxide (RNTD) characterized by loose particles with diameter in 20–50 nm has a very large surface area for adsorption of Tl, a typical trace metal that has severe toxicity. The increasing application of RNTD and widespread discharge of Tl-bearing effluents from various industrial activities would increase the risk of their co-exposure in aquatic environments. The adsorption behavior of Tl(I) (a prevalent form of Tl in nature) on RNTD was studied as a function of solution pH, temperature, and ion strength. Adsorption isotherms, kinetics, and thermodynamics for Tl(I) were also investigated. The adsorption of Tl(I) on RNTD started at very low pH values and increased abruptly, then maintained at high level with increasing pH >9. Uptake of Tl(I) was very fast on RNTD in the first 15 min then slowed down. The adsorption of Tl(I) on RNTD was an exothermic process; and the adsorption isotherm of Tl(I) followed the Langmuir model, with the maximum adsorption amount of 51.2 mg/g at room temperature. The kinetics of Tl adsorption can be described by a pseudo-second-order equation. FT-IR spectroscopy revealed that -OH and -TiOO-H play an important role in the adsorption. All these results indicate that RNTD has a fast adsorption rate and excellent adsorption amount for Tl(I), which can thus alter the transport, bioavailability and fate of Tl(I) in aqueous environment.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale Horizons
·
2020
·Vol. 5
·期 12
·1596-1602
·
IF 9.927
Kuo Lin,Fang Xiao,Ying Xie,Kai Pan,Lei Wang,Wei Zhou,Honggang Fu
Compared with the highly active anatase TiO2, rutile TiO2 usually presents poor photocatalytic performance due to high electron–hole recombination. Herein, we propose a surface domain heterojunction (SDH) structure between adjacent micro-domains with and without chemisorbed chlorine on rutile TiO2, which utilizes the potential difference between these domains to form a built-in field that promotes charge separation. Single-crystal rutile TiO2 nanorods assembled into radial microspheres with SDHs were fabricated, and these exhibited excellent solar-driven photocatalytic hydrogen evolution, ∼8-fold higher than that of the pristine one. Experimental results and density functional theory calculations reveal that the exceptional photocatalytic performance can be attributed to the in situ formation of chemisorbed chlorine, which forms SDHs that separate electrons and holes efficiently and results in surface reconfiguration, exposing the tri-active sites, increasing the O-site active centers and enhancing the catalytic activity of the 4-coordinated (Ti4c) and 5-coordinated Ti sites (Ti5c). This SDH strategy can extend to other halogen elements and thus provides an universal approach for the rational design of high-efficiency TiO2 photocatalysts toward sustainable solar-fuel evolution.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2014
·
IF 2.112
Yongping Gan,Lingyan Zhu,Huaipeng Qin,Yang Xia,Han Xiao,Lusheng Xu,Luoyuan Ruan,Chu Liang,Xinyong Tao,Hui Huang,Wenkui Zhang
In this paper, rutile TiO 2 nanoneedle/graphene composites with a unique one dimensional/two dimensional (1D/2D) hybrid nanostructure were prepared via a facile hydrothermal route. These obtained rutile TiO 2 nanoneedles with the length of ~ 500 nm have a homogeneous dispersion on the interlayers of graphene nanosheets . As the anodic materials, the as-prepared sample exhibited the superior Li storage capability with good cycling stability (over 94% capacity retention) and remarkable rate performance (149 mA h g − 1 at a 5 C rate). The improved electrochemical performance can be attributed to the unique microstructure. On the one hand, 1D rutile TiO 2 nanoneedles shorten the length of Li + transport paths to achieve a higher Li + diffusion rate. On the other hand, 2D graphene sheets provide good electronic contacts to reduce the contact resistance, as well as keep the structural integrity of the electrode materials .
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Guanjun Wen,Kuibao Zhang,Haibin Zhang,Yuancheng Teng,Ye Zhou
Synroc is recognized as the second generation waste form for safety disposal of high-level radioactive waste (HLW). In this study, the Synroc mineral of rutile was employed as host phase for the immobilization of Nd 2 O 3 and CeO 2 , which were selected as surrogates of trivalent and tetravalent actinide nuclides. Rutile waste forms with different Nd 2 O 3 and CeO 2 incorporations were prepared under normal pressure sintering. Nd 2 Ti 2 O 7 pyrochlore was produced as the target phase in 1100 °C calcined Nd-bearing TiO 2 . Lattice stabilization of CeO 2 in rutile TiO 2 could not be accomplished even under 1500 °C sintering. The 28 day normalized leaching rates ( LR i ) of Ti and Nd in Nd-bearing rutile, which decline congruously as the Nd 2 O 3 content increases, are lower than 3×10 −5 g m −2 d −1 . The incorporation of CeO 2 significantly impairs the aqueous durability of rutile waste form.
研究领域:
核废料管理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Yanfeng Cao,Xiaoting Li,Zhenfeng Bian,Addis Fuhr,Dieqing Zhang,Jian Zhu
A facile solvothermal approach was used to prepare brookite-type TiO 2 nanocrystals with different phase content and structure, accomplished by adjusting the ratio of TiCl 4 to t -BuOH. The obtained biphasic brookite/rutile TiO 2 nanocrystals showed a high brookite weight content (72%). The photocatalytic degradation of phenol under UV-irradiation was used to determine the synergetic effect from the combination of different phases ( e.g. , brookite, anatase, and rutile). The biphasic NST-4 composed of brookite and rutile exhibited the highest degradation rates, with rate constants three times higher than commercial Degussa P-25. Detailed analysis found that, besides phase composition and content, the semi-embedded structure was essential to obtain a superior activity of biphasic TiO 2 samples.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 76
·62160-62166
·
IF 3.84
Xinwei Jiang,Feng Wang,Gen Li,Lin Qi,Peng Liu,Yanfen Ding,Shimin Zhang,Mingshu Yang
As a kind of one-dimensional (1D) nanostructured material, nanorod rutile titanium dioxide (TiO2) with high surface-to-volume ratio shows potential applications in UV-ray shielding, self-cleaning devices, energy conversion and storage. Well dispersed rod-shaped rutile was prepared by hydrolysis of TiCl4 with hydrochloric acid (HCl) solutions and FeCl3 at low temperature. The crystalline form and morphology were characterized by X-ray diffraction (XRD), Raman spectrum and transmission electron microscopy (TEM). The doping of iron was confirmed by X-ray photoelectron spectroscopy (XPS) analysis. A series of experiments were conducted to figure out the effects of reaction conditions on the crystalline form and shape of the powders. The results showed that either change of acids (H2SO4 or HNO3) or varying of cations (NaCl or AlCl3) leaded to a mixed products or pure anatase. A possible mechanism was proposed to explain why the change of minerals or acids would make such a remarkable difference.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）