Science China-Materials
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2018
·Vol. 61
·期 6
·822-830
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IF 4.318
Xiao Fang,Zhou Wei,Sun Bojing,Li Haoze,Qiao Panzhe,Ren Liping,Zhao Xiaojun,Fu Honggang
Oxygen vacancy (V O ) plays a vital role in semiconductor photocatalysis. Rutile TiO 2 nanomaterials with controllable contents of V O (0–2.18%) are fabricated via an in situ solid-state chemical reduction strategy, with color from white to black. The bandgap of the resultant rutile TiO 2 is reduced from 3.0 to 2.56 eV, indicating the enhanced visible light absorption. The resultant rutile TiO 2 with optimal contents of V O (∼2.07%) exhibits a high solar-driven photocatalytic hydrogen production rate of 734 μmol h −1 , which is about four times as high as that of the pristine one (185 μmol h −1 ). The presence of V O elevates the apparent Fermi level of rutile TiO 2 and promotes the efficient electronhole separation obviously, which favor the escape of photogenerated electrons and prolong the life-time (7.6×10 3 ns) of photogenerated charge carriers, confirmed by scanning Kelvin probe microscopy, surface photovoltage spectroscopy and transient-state fluorescence. V O -mediated efficient photogenerated electron-hole separation strategy may provide new insight for fabricating other high-performance semiconductor oxide photocatalysts.
研究领域:
材料科学
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光催化
·
可再生能源
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半导体物理
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Yangjie Shao,Dongqi You,Yiting Lou,Jianhua Li,Binbin Ying,Kui Cheng,Wenjian Weng,Huiming Wang,Mengfei Yu,Lingqing Dong
Naringin, a Chinese herbal medicine, has been demonstrated to concentration-dependently promote osteogenic differentiation of mesenchymal stem cells (MSCs). However, it remains a challenge to load naringin on coatings for osteogenesis and further control the release kinetics. Here, we demonstrated that the release behavior of naringin on rutile nanorod films could be controlled by either mixing naringin with gelatin methacryloyl (GelMA) before spinning onto the films or soaking the obtained GelMA-incorporated films with the naringin solution to achieve the distinct degradation-type release and diffusion-type release, respectively. We further revealed that the naringin-loaded coatings facilitated adhesion, proliferation and late differentiation, and mineralization of MSCs. Our findings provided a novel strategy to engineer the coatings with controlled release of naringin and emphasized the bioactivity of naringin for the osteogenic differentiation of MSCs.
研究领域:
生物材料学
·
细胞生物学
·
组织工程学
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DOI
PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 9
·e202200301
·
IF 4.782
Shuang Xia,Wen Huang,Wenqi Yan,Xinhai Yuan,Xi Chen,Lili Liu,Lijun Fu,Yusong Zhu,Qinhong Huang,Yuping Wu,Teunis van Ree,Rudolf Holze
Graphical Separators for advanced Li−S batteries were prepared using spherical rutile TiO 2 with oxygen vacancies and three-dimensional interconnected graphene-like carbon. As an advanced energy-storage system, Li−S batteries have attracted much attention, but there is still a series of problems hindering their commercialization, such as the ‘shuttle effect’ and corrosion of lithium anodes. To alleviate these two important problems simultaneously, we modified the separators with spherical rutile TiO 2 with oxygen vacancies (abbreviated OT) and three-dimensional interconnected graphene-like carbon (abbreviated GC) for advanced Li−S batteries to improve the electrochemical performance. The modified separators (abbreviation OTCD) have low charge transfer impedance, a catalytic effect on polysulfides, and a barrier effect on polysulfides, which can suppress the ‘shuttle effect’ and prevents the corrosion of lithium anodes in Li−S batteries. The as-prepared Li−S batteries show good cycling stability for 250 cycles with 0.048 % capacity decay per cycle at 1 C. Moreover, the SEM images of lithium anodes after 50 cycles showed that the lithium anodes were uncorroded. This work provides a practical and effective reference for the advanced Li−S batteries.
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Journal of Physical Chemistry C
·
2014
·
IF 4.835
Yan Yan,Chao Wang,Xu Yan,Lisong Xiao,Jianghua He,Wei Gu,Weidong Shi
The construction of heterojunction photocatalysts has received much attention in the field of photocatalytic H2 production from water splitting. The surface phase junction of semiconductors is very important to the activity of heterojunction photocatalysts. In this study, an effective anatase–graphene–rutile heterojunction structure was designed and fabricated by using graphene as the surface phase junction between anatase and rutile particles. Results show that both the anatase/rutile ratio (A/R ratio) and graphene amount represent important influence on H2 production activities of anatase–graphene–rutile heterojunction photocatalysts. Under our experimental condition, the optimum A/R ratio is 7/3 and graphene addition amount is 2 wt %, the corresponding AR7/3–2%G sample has the highest H2 production rate of 1.714 mmol/h. By further experimental study, we think the high H2 production activity of anatase–graphene–rutile heterojunction photocatalyst is from the enhanced charge separation rather than other effect. This work values the expanding of surface phase junction and provides a feasible strategy to develop high-performance photocatalysts by designing and expanding the surface phase junction.
研究领域:
材料科学
·
能源科学
·
化学工程
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高影响因子
Arabian Journal of Chemistry
·
2018
·
IF 2.969
Junyan Kuang,Zipeng Xing,Junwei Yin,Zhenzi Li,Siyu Tan,Meng Li,Jiaojiao Jiang,Qi Zhu,Wei Zhou
Ti 3+ self-doped rutile/anatase/TiO 2 (B) mixed-crystal tri-phase heterojunctions photocatalysts are fabricated via hydrothermal approach and mechanochemical process, followed by in-situ solid-state chemical reduction approach. The as-prepared samples are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The photocatalysts are consisted by anatase/rutile TiO 2 nanoparticles and 1D TiO 2 (B) single-crystalline nanorods, which form rutile/anatase/TiO 2 (B) tri-phase heterojunctions. The visible-light-driven photocatalytic degradation rates of methyl orange and phenol are up to ∼98 and 97%, which are 2.2 and 1.8 times higher than that of commercial Degussa P25, 2.3 and 2.2 times higher than that of pure TiO 2 (B) as well. The enhancement can be attributed to the synergistic effect of special nanostructure, tri-phase heterojunctions, oxygen vacancy and Ti 3+ self-doping, which facilitates the absorption of visible light and the spatial separation of photo-generated charge carriers. This work provides a new perspective for designing high-active visible-light-driven photocatalyst in future.
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高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Huihui Li,Xiaoyong Wu,Shu Yin,Kenichi Katsumata,Yuhua Wang
Novel g-C 3 N 4 /rutile-brookite TiO 2-x N y composite photocatalysts were fabricated through a facile solvothermal approach. The effect of rutile phase TiO 2 with brookite TiO 2 and g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /nitrogen-doped TiO 2 composite was studied. The photocatalytic performance of the photocatalyst was evaluated by measuring the degradation of NO gas under visible and UV light irradiation. It is suggested that g-C 3 N 4 /rutile-brookite TiO 2-x N y forms a Z-scheme photocatalytic system, which shows improvement on the photocatalytic activity than that of g-C 3 N 4 /single brookite TiO 2-x N y . By importing rutile phase TiO 2-x N y , the photogenerated electrons can efficiently transfer from rutile TiO 2 to g-C 3 N 4 , which results in the separation of electron and hole pairs, enhancing the photocatalytic ability. However, single brookite TiO 2-x N y can not remove the photogenerated electrons efficiently and the photocatalytic performances of composites decrease with g-C 3 N 4 amount increase.
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高影响因子
Molecular Catalysis
·
2017
·
IF 0
Wenwen Ma,Yan Xu,Kaiwen Ma,Yuhui Luo,Yushuang Liu,Hong Zhang
PW 11 Sn/TiO 2 (PW 11 Sn = (OTA) 3 PW 11 SnO 39 , OTA = octadecyl trimethyl ammonium) nanofibres with tunable rutile/anatase phase have been successfully prepared via combining with electrospinning and hydrothermal method . The crystal phase of TiO 2 was influenced by the loading amount of PW 11 Sn and the desulfurization efficiency was related with the crystal phase of TiO 2 . When the loading amount of PW 11 Sn on TiO 2 nanofibres was 50%, DBT could be completely removed using 0.02 g PW 11 Sn/TiO 2 nanofibres as catalysts and [Bmim]PF 6 as extraction agent at 60 °C within 20 min, when O/S value was 6:1. Furthermore, the influences of different morphologies and preparation methods for catalysts on desulfurization efficiencies were investigated in detail. This catalyst can be recovered easily and reused at least 7 times maintaining the catalytic activity. For different substrates, the efficiencies of sulfur removal decreased as the following orders: DBT > 4,6-DMDBT > BT under the same conditions. Finally, the mechanism of desulfurization was also elucidated.
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SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Bin Li,Jing Xue,Xin Lv,Ruochen Zhang,Kaixuan Ma,Xianwen Wu,Lei Dai,Ling Wang,Zhangxing He
Rechargeable aqueous zinc ion batteries have attracted significant attention because of their non-toxicity, high theoretical capacity, and low cost. However, many challenges regarding zinc anodes have hindered the development of zinc ion batteries , such as the growth of zinc dendrites, passivation and hydrogen evolution . In this study, a simple strategy based on porous rutile nano-TiO 2 coating was used to guide uniform deposition of zinc ions to inhibit the formation of zinc dendrite. The TiO 2 coated zinc anode shows excellent electrochemical performance . Therefore, for Zn Zn symmetric cell, the zinc anode protected by TiO 2 coating shows reduced voltage hysteresis (50 mV at 0.4 mA cm −2 ). Moreover, for Zn-MnO 2 full cell, the cell with TiO 2 coating also shows excellent cycling performance. The discharge capacity of Zn-MnO 2 full cell is only 27.69 mAh g −1 after 500 cycles, while discharge capacity of Zn@TiO 2 -MnO 2 full cell is up to 89.14 mAh g −1 . This excellent electrochemical performance may be attributed to improved wettability of TiO 2 coated zinc anode, the uniform deposition of Zn 2+ and reduction of Zn dendrites. Overall, this study provides a simple and beneficial strategy for future development of rechargeable aqueous zinc ion batteries .
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Wenjiao Chang,Honghuo Wang,Tingting Wu,Shuting Zhang,Yifan Li,Junying Wang,Yongqiang Yang,Lei Wang
Photocatalytic CO 2 reduction reaction is regarded as a potential strategy to convert greenhouse gases into valuable chemicals. However, achieving photocatalysts with high efficiency and target product selectivity under visible light still faces great challenges. Herein, sub-2 nm RuO 2 @TiO 2 (RTO) nanorods with lattice matching interface are rationally designed and prepared via a hydrothermal reaction step-by-step. Due to the strong interaction of the lattice-matched interface with the Ru-O-Ti bond, new energy levels have emerged at the interface, leading to effective visible light absorbance. Moreover, the photo-generated electrons could be transferred to the RuO 2 efficiently via the lattice-matched interface. As a result, the RTO photocatalyst exhibits superior CO 2 -to-CH 4 conversion performance of 15.6 µmol g −1 with a selectivity of 87.9% under visible light irradiation. Density functional theory (DFT) calculation reveals that the energy barrier of CO* to CO is significantly higher than that of *CHO, resulting in the preferential production of CH 4 . This work provides an effective strategy for designing photocatalyst with promoted visible light absorption and improved product selectivity.
研究领域:
材料科学
·
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhanshuai Li,Jinsheng Li,Huanyu Zhao,Mengwen Zhang,Pengfei Li,Liang Dong,Lei Wu,Haipeng Ji,Xiwei Qi
A new high-entropy oxide, (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 with rutile structure, was successfully synthesized using solid-state reaction method. The phase structure of the ceramic samples prepared forming a range of binary to quinary phase with increasing entropy were investigated, and the effects of atmosphere-induction and high-entropy synergistic behavior on the dielectric performance were studied. As the type of the cations increases, the temperature required to form a single rutile structure gradually decreases, while the dielectric properties of the ceramics gradually improved. The dielectric constant of the (Ge 0.2 Mn 0.2 Ti 0.2 Sn 0.2 Mo 0.2 )O 2 high-entropy oxide ceramics sintered in the nitrogen atmosphere at 1350°C is nearly 20 times higher of the ceramics sintered in the air. This significant enhancement can be attributed to the occurrence of two rutile structures and the generation of excessive oxygen vacancies as a result of high-entropy synergistic behavior under the nitrogen sintering atmosphere.
研究领域:
材料科学
·
陶瓷材料
·
介电材料
·
高熵合金
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Yangguang Zhu,Jun Peng,Chen Ye,Cheng-Te Lin
TiO 2 nanosheets with rutile as the principle crystalline phase were prepared through the in-situ electrochemical oxidation of Ti 3 C 2 T x nanosheets. • Electrochemical transformation method exhibits higher efficiency in inducing the anatase-to-rutile phase transition than the conventional method of high-temperature heating. • Our study elucidates the mechanism underlying the structural evolution and phase transition in TiO 2 nanosheets from a thermodynamic perspective, offering valuable insights for the rational design of biosensing platforms towards biomolecules. Two-dimensional TiO 2 nanosheets (NS) enable efficient stabilization of aptamers and enhanced electron transfer on electrode surface for electrochemical biosensing applications. However, the effect of morphology and crystalline phase of TiO 2 NS on its detection performance towards biomolecules are unclear. Meanwhile, the mechanism underlying the structural evolution and anatase-to-rutile phase transition in TiO 2 NS via electrochemical transformation remains elusive. Thus, TiO 2 NS with rutile as the principal crystalline phase were prepared through the in-situ electrochemical oxidation of Ti 3 C 2 T x NS, offering a more accessible and sustainable alternative method compared to previously reported approaches. Density functional theory simulations demonstrated that electrochemical transformation method minimizes the phase transition energy difference and accelerates the phase transition. TiO 2 NS-based electrodes presented a low detection limit of 10.2 nM towards UA with sensitivity as 1.924 μA . cm –2. μM –1 (0.03–0.3 μM) and linear range from 0.03–0.3 and 0.03–300 μM, and achieved acceptable stability, interference resistance, temperature adaptability and feasibility in urine sample analysis. Our approach exhibits higher efficiency in inducing the anatase-to-rutile phase transition than the conventional method of high-temperature heating. Thus, our study elucidates the mechanism underlying the structural evolution and phase transition in TiO 2 NS from a thermodynamic perspective, offering valuable insights for the rational design of biosensing platforms towards biomolecules. TiO 2 nanosheets (NS) was in-situ fabricated and grown on the surface of Ti 3 C 2 T x NS controllably via the electrochemical oxidation of Ti 3 C 2 T x NS in the electrochemical reactor, as shown in Figure a. Extending the oxidation time leads to a monotonic increase in the surface coverage of TiO 2 nanoparticles (NP) until full coverage is achieved. Our synthesized TiO 2 NS exhibits superior electrochemical performance, owing to their increased surface-to-volume ration, shorter ion diffusivity paths, faster electron transferring and efficient immobilization of aptamers. Density functional theory simulations demonstrated that electrochemical transformation method minimizes the phase transition energy difference and accelerates the phase transition (Figure b). Our approach exhibits higher efficiency in inducing the anatase-to-rutile phase transition than the conventional method of high-temperature heating. Download: Download high-res image (252KB) Download: Download full-size image
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高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Tianchen Liu,Haiqin Jiang,Anning Zhao,Fulin Deng,Ruixin Zhang,Linjie Song,Yuanzhen Zhou,Jihua Nie,Min Ren,Wenlong Mao,Yunjie Xiang,Xi Rao
Regulating the exposed-facet area ratio of rutile TiO 2 is an effective route to tune charge separation, but its influence on gas-phase formaldehyde photo-oxidation remains unclear. Here, rutile TiO 2 nanorods with different (111)/(110) facet-area ratios were synthesized by an HCl-assisted hydrothermal route by varying the HCl concentration. Increasing the acid concentration promoted the formation of well-defined rutile nanorods, while the corresponding facet-area ratio decreased from 0.138 to 0.044 as the rods became longer and thinner. Among the samples, TNH-3M (R f = 0.138) exhibited the weakest photoluminescence, the highest photocurrent response, and the smallest electrochemical impedance arc, indicating the most efficient charge separation and interfacial charge transfer. Mott-Schottky analysis further showed that TNH-3M possessed the most positive valence-band position among the rutile nanorod samples, which favored the generation of •OH radicals. Accordingly, TNH-3M delivered complete removal of gaseous formaldehyde within 2 h under 420 nm LED irradiation and maintained >95% efficiency after repeated cycling. Batch synthesis also retained high activity, confirming the scalability of the preparation strategy. The improved performance is therefore attributed to the optimized balance between the oxidation-dominant (111) facets and reduction-dominant (110) facets, which promotes spatial charge separation and enhances ROS generation. Download: Download high-res image (171KB) Download: Download full-size image
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高影响因子
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