APPLIED SURFACE SCIENCE
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2014
·
IF 2.538
Penghui Shao,Jiayu Tian,Zhiwei Zhao,Wenxin Shi,Shanshan Gao,Fuyi Cui
Visible light photocatalytic activity of amorphous TiO 2 doped with carbon is prepared by a facile sol-gel route for the first time. The most active sample with mesostructure of amorphous phase, high surface area (273 m 2 g −1 ) and large pore volume (0.33 cm 3 g −1 ) is identified by X-ray diffractometer, Raman spectrometer, transmission electron microscope and N 2 adsorption–desorption isotherms. In addition, the most active sample is characterized by Fourier transform-infrared spectrometer, X-ray photoelectron spectrometer, UV–vis diffuse reflectance spectrometer and luminescence spectrometer. The results show that the most active sample with oxygenic groups has a narrower bandgap and lower recombination of electron–hole, due to the carbon doping and phase of amorphous. Effective photodegradation capability and stability of rhodamine B and colorless 4-chlorophenol are verified by photocatalytic tests under visible light irradiation. A possible mechanism of amorphous TiO 2 doped with carbon for visible light photocatalysis is proposed. The findings of this paper will provide new insights to design visible light-induced photocatalyst based on amorphous TiO 2 for organic removal.
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
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2016
·
IF 8.328
Long Kong,Zhichun Li,Shouqiang Huang,Jinping Jia,Liang Li
Semiconductor quantum dots (QDs) are interesting photocatalysts for solar fuel production and environmental pollution control. However, the poor stability and recombination probability of photogenerated electron-hole pairs prevented the practical applications of QDs based photocatalysts. Herein we demonstrated that the incorporation of amorphous titania (TiO 2 ) coatings with CuInS 2 /ZnS-TiO 2 heterostructures (CIS/ZnS-TiO 2 gel) can markedly boost photocatalytic performance and stability for Cr (VI) reduction. The promoted photocatalytic activity of CIS/ZnS-TiO 2 gel is associated with the enhanced light-absorption and distinctive heterojunction imposed by the integration of CIS/ZnS-TiO 2 with amorphous TiO 2 coatings, which drastically speed the separation of photogenerated electron-hole pairs. Moreover, the physical protection and photocorrosion-inhibition functions (receptors of photogenerated holes from CIS/ZnS QDs) arised from the amorphous TiO 2 coatings were mainly responsible for the promoted photostability of CIS/ZnS-TiO 2 gel. Our CIS/ZnS-TiO 2 gel retained over 90% of its initial activity under cycle tests, while the bared CIS/ZnS-TiO 2 showed a distinct reduction (approximately 35%) of its original efficiency due to the photocorrosion and weight-loss. Obviously, the incorporation of amorphous TiO 2 along with its bulk appearance of gel realized the enhanced photocatalytic performance with a favorable cycling stability. This strategy could be extended to other QDs-based photocatalysts in improving photocatalytic performance toward practical application.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Zhaohui Wang,Kun Li,Junling Hu,Ang Li,Yang Tang,Yanzhi Sun,Pingyu Wan,Haomin Jiang,Yongmei Chen
H 2 O 2 production in coupled electrochemical systems, where H 2 O 2 is generated through 2e-pathway of water oxidation (2e-WOR) at anode and 2e-pathway of oxygen reduction (2e-ORR) at cathode, offers an advanced alternative to the anthraquinone process. However, the efficiency of such coupled system is often hindered by the limited activity and selectivity of electrocatalysts. Herein, a dual-functional catalyst composed of amorphous TiO 2 embedded in mesoporous carbon hollow spheres (TiO x @MCHS) is reported, which exhibits exceptional electrocatalytic performance for both 2e-WOR and 2e-ORR. By employing TiO x @MCHS-loaded electrodes as both anode and cathode in a membrane-free flow cell with 4 м K 2 CO 3 /KHCO 3 as electrolyte, a rate of 108.3 µmol min −1 cm −2 and a Faradaic efficiency (FE) of ≈145% for H 2 O 2 production are achieved at a voltage of ≈2.5 V under a constant current of 240 mA (anode: 1 cm 2 , cathode: 4 cm 2 ). Experimental and computational results reveal the crucial role of low-coordinated Ti in optimizing the adsorption of intermediates involved in the two electrode reaction pathways, thereby enhancing both activity and selectivity of these processes. This work establishes a new paradigm for the development of advanced electrocatalysts and the design of novel coupled-electrolysis systems, enabling scalable and sustainable H 2 O 2 electrosynthesis.
研究领域:
材料科学
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电化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 21
·11437-11443
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IF 7.443
Shusheng Pan,Xiaolin Liu,Min Guo,Siu fung Yu,Haitao Huang,Hongtao Fan,Guanghai Li
Ti3+-doped amorphous TiO2 nanoparticles (a-TiO2:Ti3+), which are an intermediate band semiconductor, were fabricated by high intensity ultraviolet pulsed laser ablation in water. The absorption band of a-TiO2:Ti3+ nanoparticles, which appears between the visible and infrared regions, is much wider than that of the rutile TiO2 nanoparticles. The intermediate band, which has a recombination lifetime of 0.71 μs, is found to be 1.61 eV above the valence band (VB) top of TiO2. It can be shown that the a-TiO2:Ti3+/TiO2 nanotube hybrid dye-sensitized solar cells (DSSCs) not only have a high fill factor and large open circuit voltage, but also have high photovoltaic conversion efficiency as compared to TiO2 nanotube DSSCs. Considering that most of the current solar cells use only a single photoelectric conversion material (PCM), our results will promote the research on multi-PCM hybrid 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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Donghui Xu,Wenyan Chen,Yilin Luo,Hongshan Wei,Chujun Yang,Xin Cai,Yueping Fang,Xiaoyuan Yu
SiO x (0 < x < 2) based materials are attractive for developing high-capacity and durable anodes toward superior lithium storage. Herein, low cost and tailorable core-shell SiO@TiO 2 nanocomposites have been synthesized via simple ball milling and sol-gel process. The designed nanocomposite is composed of nano-sized SiO as the inner core and amorphous TiO 2 layer as the shell. Remarkably, when used as anode material for lithium-ion batteries, the SiO@TiO 2 exhibits greatly enhanced capacity performance and cycling stability due to its rational core-shell structure. The optimal nanocomposite delivers a high initial specific capacity of 1920 mA h g −1 with high initial coulombic efficiency of 79.4%, along with a stable reversible capacity of 901 mA h g −1 after 200 cycles at 200 mA g −1 and impressive high-rate capacity of 272 mA h g −1 at 3000 mA g −1 . The excellent electrochemical performance of the nanocomposite is contributed by the synergetic core-shell structure, in which the amorphous TiO 2 shell can not only act as protective/elastic buffer layer to accommodate the volume change of the SiO nanoparticles upon cycling, but also largely favor the Li + diffusion in the nanocomposite toward highly reversible lithium storage. In virtue of the simple, green and scalable fabrication process, these robust and efficient nanocomposites are promising to realize inexpensive and high-performance lithium ion batteries anodes and related energy storage applications .
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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锂离子电池
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固态化学
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表面工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
研究领域:
材料科学
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纳米技术
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光催化
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yumiao Dong,Qinhui Xie,Shuo Wu,Junbo Li,Lei Sun,Wei Ji
p-Mercaptobenzoic acid (4-MBA) is a typical molecular probe for a surface-enhanced Raman scattering (SERS) study of the enhancement performance of semiconductor nanoparticles. Understanding the molecular adsorption mechanism of 4-MBA on a semiconductor surface is crucial to reveal the enhancement mechanism of semiconductor SERS. Herein, two types of submicrometer-sized TiO2 particles with amorphous (denoted as a-TiO2) and anatase structures (denoted as c-TiO2) were fabricated, and their potential as SERS-active substrates with high electric-field enhancement was explored based on the near-field scattering theory and finite-element method simulation. The electric field-enhanced semiconductor SERS provide a better vision for us to study the adsorption modes of molecules on the TiO2 surface. On this basis, adsorption behaviors of 4-MBA on a-TiO2 and c-TiO2 particles were systematically studied by the semiconductor SERS and density functional theory. The results demonstrated that the adsorption mechanism of 4-MBA with TiO2 surfaces is highly dependent on the exposure of acid sites of TiO2 surfaces. 4-MBA adsorbs preferentially on Brønsted acid sites of a-TiO2 through a carboxyl group, in contrast on Lewis acid sites of c-TiO2 through a sulfhydryl group. Furthermore, 4-MBA molecules may form multilayer adsorption on TiO2 surfaces through the hydrogen bond and/or π–π stacking interaction. Research results not only provide a new insight to re-evaluate the chemical enhancement mechanism for TiO2–4-MBA systems but also provide a theoretical guidance for the modification of TiO2 surface with organic molecules containing carboxyl and sulfhydryl groups.
研究领域:
材料科学
·
表面化学
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纳米技术
·
光谱学
✓ 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）