Materials
·
2014
·Vol. 7
·期 5
·3786-3801
·
IF 1.879
Ruxangul Jamal,Yakupjan Osman,Adalet Rahman,Ahmat Ali,Yu Zhang,Tursun Abdiryim
Poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2and poly(3,4-(2,2-dimethylenepropylenedioxy)-2,2′:5′,2″-terthiophene)/TiO2nanocomposites were synthesized by a simple solid-state method. Additionally, the poly(3,4-propylenedioxy thiophene)/TiO2and poly(3,4-2,2-dimethylenepropylenedioxythiophene)/TiO2nanocomposites were synthesized in a similar manner for comparison. The structure and morphology were characterized by Fourier transform infrared (FTIR), ultraviolet-visible (UV-Vis) absorption spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activities of the nanocomposites were examined through the degradation processes of a methylene blue (MB) solution under UV light and sunlight irradiation. The results of FTIR and UV-Vis spectra showed that the composites were successfully synthesized by solid-state method and the poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2and poly(3,4-(2,2-dimethylenepropylenedioxy)-2,2′:5′,2″-terthiophene)/TiO2nanocomposite had a higher oxidation degree and conjugation length than others. The results also indicated that the TiO2had no effect on the crystallinity of composites, but was well embedded in the polymer matrix. Additionally, the highest degradation efficiency of 90.5% occurred in the case of the poly(3,4-propylenedioxy-2,2′:5′,2″-terthiophene)/TiO2nanocomposite.Keywords:polyterthiophene derivative;nano-TiO2;solid-state method;photocatalyst
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Qing Shan,Yong Liu,Xinlei Zhang,Jinfa Shao,Daqian Hei,Yongsheng Ling,Wenbao Jia
In this work, the biological enrichment of TiO 2 nanoparticles (NPs) by Salvinia natans was studied, and the EDXRF technology was used to evaluate the ability of Salvinia natans to enrich TiO 2 NPs. At the same time, with the accumulation of TiO 2 Nps in Salvinia natans, the changes of nutrient elements (P, S, Ca, Fe, and Zn) in its leaves and root tissues of Salvinia natans were observed simultaneously. The experimental results indicate that the Salvinia natans showed a strong potential to enrich the TiO 2 NPs. It had accumulated about 14.9 mg/g and 2.2 mg/g of titanium in roots and leaves when they were cultured in the highest TiO 2 NPs concentration (20 mg/L) to saturation. By calculating the bioconcentration factors (BCF), the enrichment ability of TiO 2 NPs in S. natans was evaluated. It was found that the enrichment effect of Salvinia natans on TiO 2 NPs showed negative correlation with the culture concentration. As to nutrient elements, the contents of P, S, and Ca in the roots and leaves were significantly increased with the increase of Ti enrichment. It might mean that the TiO 2 NPs have a positive effect on the growth and development of Salvinia natans. Besides, the reduction of Fe might indicate that the absorption of TiO 2 NPs affects the bioaccumulation of metal ions in Salvinia natans.
研究领域:
环境科学
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植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huying Yan,Yang Guo,Xingzhi Bai,Jiawei Qi,Haipeng Lu
Optimizing and enhancing the performance of electromagnetic wave (EMW) absorption materials relies on the modification of their composition and structure through heterogeneous interface engineering. Ti 3 C 2 T x ’s high conductivity results in an impedance mismatch, which hinders efficient EMW absorption. Herein, a one–step catalytic chemical vapor deposition (CCVD) method is used to construct the Ti 3 C 2 T x /TiO 2 @C heterogeneous structure. Upon annealing at 500 °C, amorphous carbon is uniformly deposited on the Ti 3 C 2 T x surface, thereby incorporating the scale–like TiO 2 generated during the process. The inclusion of the amorphous carbon layer and TiO 2 reduces the substrate’s conductivity, achieving optimized impedance matching. Additionally, building heterogeneous interfaces between Ti 3 C 2 T x , TiO 2 , and C enriches multiple loss mechanisms involving dipole and interfacial polarization, ultimately enabling optimal EMW absorption performance. The minimum reflection loss ( RL min ) value of Ti 3 C 2 T x /TiO 2 @C–500 is –53.12 dB when its thickness and frequency are 1.15 mm and 13.80 GHz, respectively. Moreover, thermal infrared imaging confirms that coatings fabricated using Ti 3 C 2 T x /TiO 2 @C–500 demonstrate a favorable heat dissipation rate, validating its effectiveness in addressing the challenge of efficient heat dissipation in electronic devices. This study significantly contributes to the progress of two–dimensional (2D) materials, enabling high–performance EMW absorption and expanding their applications in complex scenarios.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2016
·
IF 2.477
Ran Li,Yin Zhao,Ruien Hou,Xin Ren,Shuai Yuan,Yanyan Lou,Zhuyi Wang,Dongdong Li,Liyi Shi
The optimization of charge transfer at the TiO 2 /dye/electrolyte interface is crucial to the design of dye-sensitized solar cells. In this paper, the Al doped TiO 2 layers were coated on the mesoporous TiO 2 films by a chemical bath deposition process, followed by sintering at 500 °C. Its performance as the TiO 2 /dye/electrolyte interface layer was investigated. The analysis results reveals that the Al doped TiO 2 coating can reduce the oxygen vacancy-Ti 3+ concentrations in the photoanodes significantly, which is beneficial to suppress the back electron transfer process from TiO 2 to electrolyte. Furthermore, the electron mobility of the modified photoanodes was increased. Consequently, the dye sensitized solar cells (DSSC) based on the photoanodes modified by Al-doped TiO 2 coating show an improvement on both enhancing the electron transport and suppressing the charge recombination process. The dye sensitized solar cell based on the photoanode modified by 1.0 mol% Al-doped TiO 2 layer, shows a power conversion efficiency as high as 7.66%, increasing 9.12% compared with the unmodified reference cell. Finally, our works show a facile and scalable technique to further optimize interfacial charge transfer process in dye sensitized solar cells.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 85
·54068-54077
·
IF 3.108
Wenhan Chen,Qi Luo,Xueshuang Deng,Jianfeng Zheng,Chenxi Zhang,Xiaohong Chen,Sumei Huang
The morphology of electron transport layers has a significant impact on the device architecture and electronic processes of mesoscopic perovskite solar cells (PSCs). In this study, ultrathin MgO is coated on the surface of compact TiO2 (c-TiO2). The MgO-coated c-TiO2 is first used as seeds to hydrothermally grow one-dimensional (1D) TiO2 nanorod (NR) arrays for PSC devices. Rutile nanorod arrays are fabricated via a facile solvothermal method using tetrabutyl titanate (TBT) as the Ti precursor. The microstructures and morphologies, including nanorod diameter, length, and areal density, of the TiO2 NR arrays are varied by controlling the concentration of TBT from 0.3 M to 0.7 M. Furthermore, the profound effects of the MgO modification and titania nanorod morphology on the pore-filling of perovskite CH3NH3PbI3, charge separation and recombination at the perovskite/titania nanorod interface are investigated. Our results reveal that the Ti precursor concentration strongly affects the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF) of the 1D TiO2 NR array-based device. Under optimized conditions with MgO coating and at 0.4 M TBT, our champion cell with 1D TiO2 NRs demonstrates a power conversion efficiency (PCE) of 17.03% with JSC = 22.01 mA cm−2, VOC = 1.06 V, and FF = 0.73. Under the same fabrication conditions, MgO modification enhances the average PCE to 16.24% for the PSCs with the MgO coating from 13.38% for the PSCs without the MgO coating. The devices show an approximately 18% improvement in performance, which mainly results from the open-circuit voltage and fill factor enhancements. Moreover, advantageously, the MgO modification is found to reduce the current density–voltage (J–V) hysteresis with respect to the scan direction and improve the UV stability of the non-encapsulated cells. Therefore, this study presents a promising approach to fabricate efficient and stable one-dimensional TiO2 nanorod array-based perovskite solar cells.
研究领域:
材料科学
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光电子学
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能源研究
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 19
·18246-18258
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IF 2.195
Yu Zongxue,Feng XiaoFang,Min Xia,Li XiuHui,Shao LiangYan,Zeng HaoJie
In the study, the reduced graphene oxide/graphitic Bi 12 O 17 Cl 2 –TiO 2 heterojunctions sheet membrane(RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 ) was fabricated by the dopamine modification and assembling the RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 composites on the surface of commercial CA(cellulose acetate) membrane to degrade methylene blue (MB) and p-chlorophenol (4-CP) to harmless products. These membrane materials were comprehensively characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectra (DRS). The results showed that RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 nanofiber membrane exhibited extremely high degradation performance with a good distribution of RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 on the CA nanofiber membrane surface. Besides, the complete photodegradation of 100 mL MB (15 mg L −1 ) solution and 100 mL 4-CP (15 mg L −1 ) solution with artificial visible-light was achieved after 100 min and 160 min, respectively. The RGO/PDA/Bi 12 O 17 Cl 2 –TiO 2 -CA composite membrane revealed the ability of continuous and simultaneous flow-through separation of oil/water emulsion and degradation of soluble organic dye under visible-light irradiation in a short time. Moreover, the nanofiber membranes exhibited excellent stability and reusability for MB-containing oil–water mixed emulsion separation has great potential to be applied in industrial application.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
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
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能源科学
✓ 已验证
DOI
高影响因子
Nano Research
·
2016
·Vol. 9
·期 4
·1182-1192
·
IF 8.893
Li Lixiong,Huang Shuangshuang,Song Jianjun,Yang Nating,Liu Jingwei,Chen Yuyun,Sun Yuhan,Jin Rongchao,Zhu Yan
Ultrasmall Au 10 clusters have a unique electronic structure and can act as a charge reservoir to donate electrons or accept charges. This is particularly important for catalysis, since it leads to facile charge transfer across the interface between the gold species and the oxide substrate. To determine the electronic and structural effects of Au 10 on the catalytic oxidation, a TiO 2 charge carrier was chosen as the substrate to anchor Au 10 for olefin oxidation. Au 10 supported on TiO 2 -RP (RP = pyramid-capped columnar structure) exhibited superior catalytic activity to Au 10 /TiO 2 nanotubes and Au 10 /P25. In addition, the supported Au 10 clusters gave rise to higher activity than supported Au 20 , Au 144 clusters, and 5 nm Au nanocrystals. The superior catalytic ability of Au 10 /TiO 2 -RP arises from the charge/discharge effect of the Au 10 /TiO 2 -RP interface, which effectively improves the formation of active oxygen species on electron-rich gold atoms at the terminal position of Au 10 , and promotes the activation of olefin C=C bonds on the electron-deficient gold atoms of Au 10 .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Xiaoyuan Liu,Yu Zou,Jiang Jiang
We report selective photocatalytic partial oxidation of glycerol on bimetallic formate oxidase mimicking AuPt/TiO 2 , with a unique self-accelerating reaction kinetics discovered for the first time. Systematic investigation on the glycerol oxidation in the presence of externally added formic acid and various scavengers reveals a positive correlation between photocatalytic activity and solution H 2 O 2 level. A reaction mechanism has been put forward, where the in situ generated formic acid consumes photogenerated holes, and enables on-site H 2 O 2 production on AuPt/TiO 2 , resulting in accelerated glycerol oxidation and improved C3 product selectivity. In pH 9 borate buffer solution, C3 products selectivity of 72% (60% for glyceric acid) has been achieved at 90% glycerol conversion under AM 1.5 G irradiation for 4 h, at ambient conditions. Our findings presented here may help guiding catalyst design for the photocatalytic biomass valorization in the future.
研究领域:
催化化学
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可再生资源转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITE INTERFACES
·
2019
·
IF 2.025
Xueyi Zhu,Shuling Shen,Zhihong Tang,Junhe Yang
Ti3+-doped TiO2@C nanorods were prepared through a facile hydrothermal process. Na2Ti3O7 ultralong nanotubes and glucose were used as TiO2 precursor and carbon (C) source, respectively. During hydrothermal treatment, the hydrolysis of Na2Ti3O7 and polymerization of glucose induced the formation of TiO2 nanorods with a coating of carbon complex. At the same time, a part of Ti4+ was reduced to Ti3+ due to the rich hydroxyl groups in glucose. After calcination, an ultrathin carbon shell was formed on the surface of TiO2 nanorods. In this prepared composite, Ti3+ self-doped TiO2 nanorods work as photosensitizer to harvest solar energy to generate electron-hole pairs, the tight-binding interface between TiO2 nanorods and carbon shell works as electron transportation path, and the ultrathin carbon shell acts as electrons trapped and accumulated site. Photocatalytic test results indicate that Ti3+-doped TiO2@C nanorods exhibit higher activity and stability than TiO2 for photodegradation of methylene blue under visible light.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6474
·
IF 3.623
Huan Shuai,Jiao Wang,Xianguang Wang,Gaoxiang Du
Herein, using black talc as a carrier, a ternary black talc-TiO2/ZnO composite photocatalyst was prepared by the sol-gel method, and the effect of the black talc on the hetero-structure properties of the TiO2and ZnO was systematically studied. The prepared composite photocatalyst showed an excellent degradation performance of the pollutant, where black talc plays an important role in promoting the interface interaction by enhancing the contact area between the TiO2and ZnO. Moreover, the free carbon element doping in black talc favors the formation of more oxygen vacancies, thereby improving the response as a photocatalyst in visible light. In addition, the carbon in the black talc can also adsorb organic pollutants and enrich the surroundings of the photocatalyst with pollutants, so it further improves the catalytic efficiency of the photocatalyst. Under UV irradiation, the degradation rate of Rhodamine B on black talc-TiO2/ZnO was found 3.3 times higher than that of black talc-TiO2with good stability.Keywords:black talc carrier;heterostructure;photocatalyst;TiO2;ZnO
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1635
·
IF 4.501
Mingjun Wang,Che Li,Bingfang Liu,Wenzhen Qin,Yu Xie
Heterojunction photocatalytic materials show excellent performance in degrading toxic pollutants. This study investigates the influence of calcination temperature on the performances of floral Bi2O3/TiO2composite photocatalyst crystal, which was prepared with glycerol, bismuth nitrate, and titanium tetrachloride as the major raw materials via the solvothermal method. XRD, SEM/TEM, BET, Uv-vis, and XPS were employed to analyze the crystal structure, morphology, specific surface area, band gap, and surface chemical structure of the calcined temperature catalysts. The calcination temperature influence on the catalytic performance of composite photocatalysis was tested with rhodamine B (RhB) as the degradation object. The results revealed the high catalytic activity and higher photocatalytic performance of the Bi2O3/TiO2catalyst. The degradation efficiency of the Bi2O3/TiO2catalyst to RhB was 97%, 100%, and 91% at 400 °C, 450 °C, and 500 °C calcination temperatures, respectively, in which the peak degradation activity appeared at 450 °C. The characterization results show that the appropriate calcination temperature promoted the crystallization of the Bi2O3/TiO2catalyst, increased its specific surface area and the active sites of catalytic reaction, and improved the separation efficiency of electrons and holes.Keywords:calcination temperature;Bi2O3/TiO2compound;visible light;photodegradation
研究领域:
材料科学
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环境化学
·
光催化
✓ 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）