Catalysis Science & Technology
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2023
·Vol. 13
·期 3
·898-909
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IF 5
Haohui Gu,Feng Liang,Xiaohan Wang,Shuaibing Wu,Gongye Lv,Haijun Zhang,Shaowei Zhang,Lilin Lu,Zhijun Dong
The design of heterojunction photocatalysts is regarded as a very effective method to solve the high recombination rate of photogenerated charge carriers for CO2 photoreduction into hydrocarbons, and interface engineering is urgently required to achieve high efficiency. Herein, graphitic carbon nitride (g-C3N4, CN) was uniformly grown on the surface of nitrogen-doped rutile TiO2 (NT) nanorods by in situ deposition, and a NT@CN core/shell step-scheme (S-scheme) heterojunction system composed of NT nanorods and g-C3N4 was synthesised. The as-synthesised heterojunction containing 55 wt% g-C3N4 delivered the highest CO2 photoreduction activity (33.35 μmol g−1 for CO) without additional cocatalysts or external sacrificial agents, which was 7.1 times higher than that of bare NT nanorods. This improved CO2 reduction activity was attributable to the large surface area and impactful S-scheme heterostructure, which imparted the catalyst with sufficient visible-light harvesting ability, promoted the segregation and transformation of the photoinduced charge pairs, and enhanced the redox ability of the carriers. Concurrently, the NT@CN photocatalyst exhibited excellent reusability and stability. This work offers a new basis for designing and preparing rutile TiO2-based S-scheme heterojunctions with enhanced CO2 reduction performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 45
·2002629
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IF 16.836
Chao Wang,Jiansheng Zhang,Xianfen Wang,Chunfu Lin,Xiu Song Zhao
Flexible electrodes with high charge storage capacity, low solid-state diffusion resistance toward charges, and excellent mechanical properties are needed for fabricating flexible energy storage devices. In this paper, an approach is described to synthesize a composite material with hollow rutile TiO 2 cuboid arrays supported on carbon fiber cloth (H-TiO 2 @CFC). This composite material is used as a self-supporting and binder-free anode for sodium-ion storage, delivering reversible charge capacities of 287.3 at 0.1 C and 103.3 mAh g −1 at 50 C, respectively. The observed excellent electrochemical performance of the H-TiO 2 @CFC electrode is mainly attributed to its unique architecture, which facilitates ion transport, improves electron conductivity, and enables active surface reactivity toward sodium ions. In situ X-ray diffraction characterization results reveal a nearly zero strain structure of the hollow rutile TiO 2 in H-TiO 2 @CFC against electrochemical cycling. An analysis of the charge storage mechanism reveals a significant pseudocapacitance contribution to the charge storage, accounting for the observed high-rate performance of the electrode. A flexible full cell fabricated with the H-TiO 2 @CFC as the anode and Na 3 V 2 (PO 4 ) 3 as the cathode exhibits both excellent electrochemical properties and flexibility against mechanical deformation, demonstrating the great promise of the H-TiO 2 @CFC composite material for flexible battery cells.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Suqing Wu,Xueyan Li,Yanqin Tian,Yan Lin,Yun Hang Hu
As an emerging semiconductor different from regular white TiO 2 , black TiO 2 has attracted intensive attention on visible light driven photocatalysis for degrading dyes, but rarely for degradation of antibiotics. In this study, black anatase-TiO 2 was demonstrated to be an effective catalyst for tetracycline (TC) visible light photodegradation. 66.2% removal efficiency of TC was achieved over black TiO 2 under visible light illumination, while white TiO 2 and N-doped TiO 2 exhibited 43.4% and 59.6% removal efficiencies, respectively. Furthermore, only ⋅O 2 − radicals played an important role in TC photodegradation over white TiO 2 , whereas both ⋅O 2 − and h + were responsible for the degradation over black TiO 2 and N-doped TiO 2 . Different from white TiO 2 for visible light photocatalytic TC degradation that follows photosensitization, the visible light photodegrataion over black TiO 2 is due to photoexcitation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yingxue Sun,Shuai Liu,Huaiqiu Chang,Jianjun Liu,Lingyu Piao
The efficient conversion of methane (CH4) to high-value-added chemicals using a photocatalyst at room temperature and pressure faces great challenges compared to harsh reaction conditions. However, achieving this efficient conversion would yield substantial cost advantages and hold immense potential for development. Here, we demonstrate the enhanced photocatalytic conversion efficiency of CH4 at room temperature and pressure conditions without requiring any oxidant through the construction of a bimetal Ag–Cu-loaded brookite TiO2 photocatalyst. The C1 products were ultimately obtained with 100% selectivity and a yield of 936 μmol·g–1·h–1. The performance exceeds that of similar research by tens of times. The high selectivity of this system is attributed to the optimal number of ·OH, which strikes a balance between excess and deficiency. Ag effectively enhances electron transport in the photocatalytic reaction process on a dual active site photocatalyst, while Cu significantly improves the selectivity of the C1 products. In this system, the hydroxyl radical (·OH) activates CH4 to generate the methyl radical (·CH3), which then binds with the lattice oxygen of TiO2, breaking the Ti–O bond and resulting in the formation of *OCH3. The *OCH3 undergoes further conversion to CH3OH, which is subsequently oxidized to HCHO by ·OH. This work presents a cost-effective and highly efficient approach for directly oxidizing CH4 into valuable chemicals, ensuring superior selectivity.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
PubMed
高影响因子
CATALYSIS LETTERS
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2024
·
IF 2.3
Hu Jingru,Jiang Minjun,Hu Bingwen,Cheng Gang
Remediation of antibiotics by photocatalysis technique has been regarded as a promising route to tackle with the environmental pollution affecting human survival and development. In this work, brookite TiO 2 nanorods with different oxygen vacancy have been synthesized through tailoring the volume of ethylene glycol by hydrothermally treatment with NaTiOx-nanoassembly. After constitute and morphology confirmation with different characterizations, their photocatalytic performances are evaluated via ciprofloxacin (CIP) antibiotic degradation experiments. The result shows that the TiO 2 -0 has the highest photocatalytic efficiency towards CIP degradation, comparing with TiO 2 -15 and TiO 2 -30 samples. Although the TiO 2 -30 has high concentration oxygen vacancy, it exhibits excellent adsorption ability in the dark, rather than CIP degradation rate. The photo/electrochemical tests suggest the photo-generated electron lifetime, charge transfer ability, and the effective active sites on the material’s surface are inversely proportional to the concentration of oxygen vacancies. It also concludes that rational fabrication conditions tailoring of the photocatalyst could optimize the corresponding capability in the antibiotic degradation process. In addition, the possible degradation pathway is also proposed based on the high resolution mass spectrometry (HRMS), and the acute toxicity changes in the degradation process are also predicted. Graphical Abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanoscale Horizons
·
2020
·Vol. 5
·期 12
·1596-1602
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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
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能源科学
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催化化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2013
·Vol. 1
·期 47
·14963-14972
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IF 0
Zhifeng Jiang,Xiaomeng Lv,Deli Jiang,Jimin Xie,Danjun Mao
Extending the UV response of anatase TiO2 photocatalysts into the visible light range can play a pivotal role in promoting the practical applications of these catalysts. Nitrogen and carbon co-doped, silver loaded anatase TiO2 (Ag@NC–TiO2) single-crystal nanosheets dominated by {001} facets were prepared for the first time using leaves as the nitrogen and carbon source by a facile, low cost method. The size of the Ag particles on NC–TiO2 nanosheets can be tuned from 1.5 nm to 15 nm using a photo-reduction strategy. The synthesized Ag@NC–TiO2 nanosheets show higher photocatalytic activity in the photodecomposition of organic pollutants compared to NC–TiO2, TiO2 and P25 under visible light irradiation. The enhanced photocatalytic efficiency was ascribed to a synergistic effect between N, C and Ag. In addition, the formed Ag@NC–TiO2 heteronanosheets are highly dispersible in aqueous solution and are capable of efficient catalysis for the reduction of p-nitrophenol. The present synthesis gives a promising method of forming non-metal co-doped, metal nanoparticles (NPs) loaded anatase TiO2 with dominant {001} facets and for broad applications in catalysis and photocatalysis.
研究领域:
材料科学
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环境科学
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化学
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DOI
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Xiaohong Wang,Li Qi,Hongyu Wang
Anatase TiO2 used as the sodium-storage anode is coupled with a graphite cathode to construct dual-ion batteries. The batteries display wide voltage window (1.0–4.7 V), long cycling stability (98 mAh g–1 after 1400 cycles at 500 mA g–1), and considerable rate performance (102 mAh g–1 at 1500 mA g–1). Furthermore, the kinetic behaviors of Na+ and PF6– ions are investigated through electrochemical impedance spectroscopy, the galvanostatic intermittent titration technique, and the potentiostatic intermittent titration technique. The corresponding apparent ion diffusion coefficient is calculated, and the results indicate that the transport of PF6– anions in the graphite cathode is swift.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Qian Wang,Bohui Dong,Yingqiang Zhao,Fang Huang,Junfeng Xie,Guanwei Cui,Bo Tang
TiO 2 as an important photocatalyst, how to achieve its fast, controllable and green synthesis still remains a big challenge for the large-scale preparation and application. Deep eutectic solvents (DESs) are promising solvents in the green and mild preparation of high active nanomaterial due to their low cost, high green degree, low toxicity, easy large-scale preparation and similar properties with conventional ionic liquids. In this study, through the combined effect of both H-bond donor and H-bond acceptor, we have successfully used DES as solvent, template and inhibitor at the same time to fast synthesize new crassula peforata-like TiO 2 with (0 0 1) and (1 0 1) planes under mild reaction conditions (at 160 °C for only 4–8 h). The H 2 production rate by photocatalytic water splitting of this catalyst reaches up to 13.13 mmol·h −1 ·g −1 , which is 18-fold greater than that of commercial P25 TiO 2 and also much higher than those of other TiO 2 nanostructures. Such rate is the highest yield reported so far to the best of our knowledge for photocatalytic H 2 production catalyzed by sole TiO 2 . The higher activity is attributed to the special shape with surface heterojunctions and defects. This study will provide a new way for the green, fast, easy-controllable and batch preparation of new and high efficiency photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MOLECULES
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2022
·Vol. 27
·期 17
·5576
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IF 4.927
Songtao Liu,Rui Yan,Muhammad Humayun,Huanli Zhang,Yang Qu,Yingxue Jin
It is highly desired to enhance charge separation and O2adsorption of the pyropheophorbide-a (Ppa) to promote visible-light activity and stability. Herein, Ppa modified 001-facet-exposed TiO2nanosheets (Ppa/001T) nanocomposites with different weight ratios were fabricated via the self-assembly approach by OH induced. Compared with the bare Ppa, the 8% amount optimized 8Ppa/001T sample displayed 41-fold enhanced activity for degradation of Ametryn (AME) under visible-light irradiation. The promoted photoactivities could be attributed to the accelerated charge carrier’s separation by coupling TiO2as thermodynamic platform for accepting the photoelectrons with high energy from Ppa and the promoted O2adsorption because of the residual fluoride on TiO2. As for this, a distinctive two radicals (•O2−and •OH) involved pathway of AME degradation is carried out, which is different from the radical pathway dominated by •O2−for the bare Ppa. This work is of utmost importance since it gives us detailed information regarding the charge carrier’s separation and the impact of the radical pathway that will pave a new approach toward the design of high activity visible-light driven photocatalysts.Keywords:Ppa;001-facet-exposed TiO2;charge separation;visible-light photocatalysis;Ametryn
研究领域:
材料科学
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环境科学
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光催化
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 12
·2384-2394
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IF 3.879
Zhifeng Jiang,Jianjun Zhu,Dong Liu,Wei Wei,Jimin Xie,Min Chen
Considering that the reduction of particle size can increase the number of active sites, particle size is accepted to be the key factor in the design of photocatalysts. However, serious agglomeration of nanosized particles may cause not only a decreased surface area but also increase grain boundary recombination. Forming a hollow nano-hemisphere in single crystals with reactive sites could be a good method to overcome this drawback. In this work, we report the synthesis of novel anatase TiO2 hollow nano-hemispheres by using a mixture of CH3COO− and F− as size and morphology controlling co-agents that prevent aggregation and increase the number of active sites. Furthermore, bimetallic Ag/Pt nanoparticles (NPs) are uniformly loaded on both interior and exterior of the nano-hemispheres in situ. The Ag/Pt@TiO2 NPs with improved visible-light-harvesting ability, high charge–hole mobility, and low electron–hole recombination exhibited improved photocatalytic performance in the degradation of rhodamine B/ciprofloxacin (RhB/CIP) and hydrogen generation. The results presented here give a promising way toward the development of delicate bimetal@semiconductor composites for board applications in photocatalysis.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Siyu Zhang,Hang Jiang,Siting Liu,Zhikang Zhou,Jianwei Wang,Qianyun Wang,Kedi Cai,Qinzhi Lai,Qian Wang
Zinc–bromine flow batteries (ZBFB) are gaining significant attention for large–scale energy storage due to the high energy density and affordable cost. Nevertheless, the diffusion of Br 2 and the relatively low activity of Br 2 /Br − impede their broader application. Herein, a bi–phasic rutile/anatase–TiO 2 embedded in carbon composite with hollow sphere structure (R/A–TiO 2 @HCS) is proposed as the catalyst for the Br 2 /Br − electrode. The internal electric field (IEF) formed between rutile–TiO 2 and anatase–TiO 2 regulates the adsorption capability for active bromine species. The appropriate adsorption capability can rapidly transfer the generated Br 2 complex (QBr n ) to the adsorbent component R/A–TiO 2 during charging, liberating the carbon active sites, and release QBr n back to the carbon reaction sites timely during discharging, satisfying the both adsorption and desorption requirements of QBr n in different processes. The kinetics for oxidation and reduction are simultaneously enhanced. Moreover, the hollow construction offers storage space for QBr n , relieving its penetration problem. Under the synergistical cooperation, the ZBFB assembled with R/A–TiO 2 @HCS demonstrates the energy efficiency (EE) of 83.6 % at 80 mA cm −2 , without significant decay over 500 cycles. And the EE still maintains 70.0 % even under 160 mA cm −2 . This work highlights the significance of tailored electrocatalyst for ZBFB.
研究领域:
电化学
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材料科学
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能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）