INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Peng Liu,Yahao Zhao,Wen Liu,Furong Ye,Hui Lv,Zhuo Peng,Changcun Han,Xinguo Ma,Jiayi Tian,Difu Zhan,Qian Fu,Yizhong Huang
Solar photocatalytic hydrogen production shows promise in addressing global energy and environmental concerns. The limited efficiency of photocatalysts is mainly due to ineffective separation and transfer of photogenerated charges. To improve this, we enhance the TiO 2 –Ti 3 C 2 heterojunction by in-situ oxidation through interfacial engineering , resulting in a more compact composition . Subsequently, we anchor single-atom Pt at the TiO 2 –Ti 3 C 2 interface through photo-Ti 3 C 2 reduction. The in-situ growth of TiO 2 on Ti 3 C 2 introduces an interfacial driving force for carrier separation and provides a channel for electron transfer from TiO 2 to Ti 3 C 2 . This further facilitates transfer onto Pt, shortening the migration distance and enhancing the photocatalytic efficiency. The best Pt/TiO 2 –Ti 3 C 2 composite demonstrates an impressive hydrogen precipitation efficiency of 767 μmol g −1 h −1 , surpassing TiO 2 and Pt/TiO 2 by factors of 12 times and 1.46 times, respectively. Furthermore, we developed a higher efficiency photocatalyst using the molten salt method to avoid the risks associated with conventional hydrofluoric acid etching. This research opens up new possibilities for the preparation of MXenes interface-modified catalysts, offering a valuable avenue for future exploration in the field.
研究领域:
材料科学
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能源与环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Feifei Xu,Danyi Shang,Congcong Zhu,Guangzhu Du,Jingchen Shi,Xuefang Dong,Xiuling Li,Xinmiao Liang
Phosphopeptide enrichment methods based on commercial TiO2 suffer from difficulties in regulating intermolecular interactions, resulting in low coverage rate and the loss of information on multiphosphorylation sites, thereby limiting comprehensive phosphoproteomic analysis. In this work, MXene Ti3C2Tx was incorporated into the design of enrichment materials, with its surface structure functionalized and regulated to address the low elution efficiency of TiO2 for multiphosphorylated peptides. Upon oxidation treatment, the Ti3C2Tx material formed numerous uniformly distributed TiO2 nanoparticles on the surface of Ti3C2Tx-O, providing abundant affinity sites (Ti–O) for selective phosphopeptide enrichment. The polycrystalline structure and rich oxygen vacancies of the material effectively regulated its binding affinity with phosphate groups, achieving simultaneous high-efficiency enrichment of both monophosphorylated and multiphosphorylated peptides. Its performance was significantly superior to that of commercial TiO2 and IMAC materials. This study presents great promise for the practical application of comprehensive phosphoproteomic analysis in the future and broadens the application of MXene in the biological field.
研究领域:
分析化学
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生物化学
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材料科学
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DOI
PubMed
高影响因子
Nanomaterials
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2020
·Vol. 10
·期 3
·546
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IF 4.324
Danqi Li,Hongchen Song,Xia Meng,Tingting Shen,Jing Sun,Wenjia Han,Xikui Wang
Particle size of nanomaterials has significant impact on their photocatalyst properties. In this paper, TiO2nanoparticles with different crystalline sizes were prepared by adjusting the alkali-hydrothermal time (0–48 h). An annealing in N2atmosphere after hydrothermal treatment caused TiO2reduction and created defects, resulting in the visible light photocatalytic activity. The evolution of physicochemical properties along with the increase of hydrothermal time at a low alkali concentration has been revealed. Compared with other TiO2samples, TiO2-24 showed higher photocatalytic activity toward degrading Rhodamine B and Sulfadiazine under visible light. The radical trapping and ESR experiments revealed that O2•-is the main reactive specie in TiO2-24. Large specific surface areas and rapid transfer of photogenerated electrons are responsible for enhancing photocatalytic activity. The above findings clearly demonstrate that particle size and surface oxygen defects can be regulated by alkali-hydrothermal method. This research will deepen the understanding of particle size on the nanomaterials performance and provide new ideas for designing efficient photocatalysts.Keywords:TiO2;alkali;particle size;surface oxygen defects;photocatalysis
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Lina Kong,Xintong Zhang,Changhua Wang,Jianping Xu,Xiwen Du,Lan Li
Artificial direct Z-scheme system is promising in solar-fuel production owing to their efficient charge separation and high redox capability. However, direct Z-scheme system suffers from how to construct reasonable interfacial charge transfer channel for selective charge recombination. Here we fabricate a direct Z-scheme system consisting of g-C 3 N 4 crumpled sheet with Ti 3+ -doped TiO 2 nanoparticles via polycondensation of urea with TiO 2 followed by hydrogenated treatment. UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) manifest that the hydrogenated treatment conferred Ti 3+ defect states below the conduction band minimum (CBM) of TiO 2 and improved visible light absorption of the g-C 3 N 4 /Ti 3+ -doped TiO 2 composite. The g-C 3 N 4 /Ti 3+ -doped TiO 2 exhibits remarkable photocatalytic performance for water splitting and degradation of pollutants than that of g-C 3 N 4 /TiO 2 , C 3 N 4 , and TiO 2 . The H 2 evolution rates of g-C 3 N 4 /Ti 3+ -doped TiO 2 reach up to 1938 and 287 μmol·h −1 ·g −1 under solar-light and visible-light irradiation, which is 3.4 and 2.8 times higher than that of g-C 3 N 4 /TiO 2 . The enhanced photocatalytic activity is ascribed to the Ti 3+ defects assistant formation of g-C 3 N 4 /Ti 3+ -doped TiO 2 Z-scheme photocatalyst, which results in efficient interfacial charge emigration and separation. Our work points out the critical role of defects in construction of Z-scheme pathways for charge transfer and provides possibilities for developing the other efficient 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
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
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IF 2.752
Zhudan Chu,Linlin Qiu,Yue Chen,Zhishan Zhuang,Pingfan Du,Jie Xiong
Recycling and rapid synthesis of photocatalysts are of significant importance in wastewater degradation. Herein, a systemic strategy was developed, employing loaded nano-TiO 2 on carbon fiber (CF) utilizing microwave hydrothermal method for the fast and efficient preparation of photocatalysts . The prepared TiO 2 /CF was characterized using a variety of analytical techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), and UV–vis. Compared with pure TiO 2 particles, TiO 2 /CF is easily recycled when employed as a photocatalyst. Nitric acid oxidation treatment of CF generates polar functional groups, which improves the bonding properties between TiO 2 and CF. With increasing CF treatment time between 0 and 4 h, the loading rate of TiO 2 increases, until TiO 2 /CF produces optimum photocatalytic activity . Moreover, the experimental results indicate that TiO 2 /CF possesses favorable photocatalytic activity, achieving 97% degradation rate of Rhodamine B within 1 h of UV light irradiation. Furthermore, even after 10 experimental cycles the photocatalyst still generates 88% degradation rate.
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
高影响因子
Journal of the American Chemical Society
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2019
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IF 14.695
Shiqun Wu,Xianjun Tan,Juying Lei,Haijun Chen,Lingzhi Wang,Jinlong Zhang
Photodriven nonoxidative coupling of CH4 (NOCM) is a potential alternative approach to clean hydrogen and hydrocarbon production. Herein, a Mott–Schottky photocatalyst for NOCM is fabricated by loading Pt nanoclusters on a Ga-doped hierarchical porous TiO2–SiO2 microarray with an anatase framework, which exhibits a CH4 conversion rate of 3.48 μmol g–1 h–1 with 90% selectivity toward C2H6. This activity is 13 times higher than those from microarrays without Pt and Ga. Moreover, a continuous H2 production (36 μmol g–1) with a high CH4 conversion rate of ∼28% can be achieved through a longtime irradiation (32 h). The influence of Ga on the chemical state of a surface oxygen vacancy (Vo) and deposited Pt is investigated through a combination of experimental analysis and first-principles density functional theory calculations. Ga substitutes for the five-coordinated Ti next to Vo, which tends to stabilize the single-electron trapped Vo and reduce the electron transfer from Vo to the adsorbed Pt, resulting in the formation of a higher amount of cationic Pt. The cationic Pt and electron-enriched metallic Pt form a cationic–anionic active pair, which is more efficient for the dissociation of C–H bonds. However, the presence of too much cationic Pt results in more C2+ product with a decrease in the CH4 conversion rate due to the reduced charge-carrier separation efficiency. This study provides deep insight into the effect of the doping/loading strategy on the photocatalytic NOCM reaction and is expected to shed substantial light on future structural design and modulation.
研究领域:
材料科学
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催化化学
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理论计算
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2023
·Vol. 29
·期 24
·e202204031
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IF 4.3
Min Huang,Shuyi Zhang,Yongping Gan,Jin Liu,Zhanjun He,Tiejun Lin,Fei Yu,Yuanyuan Dai,Qiang Niu,Liangshu Zhong
Graphical Highly effective SrWO 4 /TiO 2 heterojunction photocatalysts were fabricated for photocatalytic methane oxidation into oxygenates with O 2 under mild conditions. The high-speed transfer channel between SrWO 4 and TiO 2 on SrWO 4 /TiO 2 photocatalysts promoted separation and transfer of photogenerated carriers, which enhanced the generation of oxygenates with high selectivity. Photocatalytic methane oxidation to oxygenates with promising performance remains as a grand challenge due to the low productivity and severe overoxidation. Herein, SrWO 4 /TiO 2 heterojunction was developed for photocatalytic methane oxidation with O 2 to liquid oxygenates ( Please replace “oxygenates” with “oxygenated”)products under mild reaction conditions. The optimized SrWO 4 /TiO 2 catalyst exhibited high productivity of 13365 μmol/g with high selectivity of 98.7 % for oxygenates. Benefited from the intimate heterojunction interface of SrWO 4 /TiO 2 , the constructed I-type heterostructure improved the separation and transfer of photogenerated carriers, and a high-speed transfer channel for photogenerated carriers was fabricated. Simultaneously, the special band structure can increase the amount of photogenerated electrons and holes on the TiO 2 surface, which promoted the formation of reactive oxygen species to enhance liquid oxygenates productivity.
研究领域:
材料科学
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催化化学
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环境科学
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DOI
PubMed
高影响因子
MOLECULES
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2017
·Vol. 22
·期 2
·337
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IF 2.861
Fang Li,Wai Szeto,Haibao Huang,Jiantao Li,Dennis Y. C. Leung
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical.Keywords:TiO2nanowire arrays;photocatalytic rotating reactor;wastewater treatment
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Xin Wang,Zhe Zhao,Dingrong Ou,Baofeng Tu,Daan Cui,Xuming Wei,Mojie Cheng
Ag/TiO 2 nanocomposites comprising of Ag clusters on TiO 2 nanocrystal surfaces are of great significance in catalysts and advanced functional materials. Herein a novel method to synthesize Ag/TiO 2 nanocomposites with Ag clusters under 2 nm on TiO 2 nanocrystal surfaces have been developed. The success of this method relies on a silver mirror reaction in toluene, which refers to the reduction of silver-dodecylamine complexes by acetaldehyde in the presence of mono-dispersed TiO 2 nanocrystals. The prepared Ag/TiO 2 nanocomposites have been characterized by FT-IR spectra, UV–vis absorption spectra, X-ray diffraction (XRD) analysis, ultra high resolution scanning electron microscope (Ultra-HRSEM), high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectra (XPS). Catalytic activity of Ag/TiO 2 nanocomposites is evaluated for the reduction of p -nitrophenol (4-NP) into p -aminophenol (4-AP) by NaBH 4 . Results demonstrate that Ag/TiO 2 nanocomposites have shown an outstanding catalytic activity as well as a good stability in successive reduction of 4-NP. Noticeably, TOF of Ag/TiO 2 -0.75 nanocomposites obtained in this work is the highest among Ag based catalysts previously reported.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2016
·Vol. 49
·期 31
·315304
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IF 2.772
Xiaohui Ren,Xiang Qi,Yongzhen Shen,Si Xiao,Guanghua Xu,Zhen Zhang,Zongyu Huang,Jianxin Zhong
2D photocatalytic TiO2/MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out and confirm a well crystalized anatase and 2H-MoS2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating the relatively stability of the MoS2 nanosheet platform with a high specific surface area. UV–vis spectra and electrochemical impedance spectra exhibit an enhanced light absorption ability and conductivity of TiO2/MoS2 compared to that of just TiO2. Photoelectrochemical (PEC) tests also demonstrate the photocurrent of 20 : 1 TiO2/MoS2 HNs is greatly improved compared to that of as-prepared TiO2. The saturation current density is about 33 µA cm−2 when the applied potential is 0.2 V, which is nearly twice that of pure TiO2 and four times as high as 5 : 1 TiO2/MoS2 HNs and 1 : 1 TiO2/MoS2 HNs. Besides that, the duration test exhibits no detectable distinction after processing 25 cycles. The improved photocatalytic activities are perhaps derived from the high conductivity and the increased active sites for the introduction of co-catalytic MoS2 nanosheets as well as the positive synergetic effect between the TiO2 and MoS2. This work demonstrates that the as-prepared TiO2/MoS2 HNs may have a great potential application in PEC hydrogen production.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Pei Qiu,Yong Zhang,Gang Cheng
Solar-to-hydrogen production has attracted increasing attention since it possesses great potential in alleviating energy and environmental crises to some extent. The key issue is to develop efficient photocatalysts exhibiting superior hydrogen production capability. In this work, Cu@TiO 2 hybrid (Cu nanoparticles encapsulated in TiO 2 ) has been successfully prepared by Cu 2 O self-template reduction through solvothermal treatment in ethylene glycol-water mixed solvent. When octahedral Cu 2 O is involved in the reaction system, the Cu 2 O@Ti-precursor octahedral structure is first formed and subsequently the Cu@TiO 2 hybrid is prepared with the reduction of ethylene glycol (EG). The Cu@TiO 2 hybrid derived with different mass of Cu exhibits improved photocatalytic hydrogen production performance compare to pure TiO 2 and P25. Among those photocatalysts, the Cu@TiO 2 -10% (the copper content is 10 wt%) shows the highest hydrogen evolution rate of 4336.7 μmol g −1 h −1 , and it is twice as much as the pure TiO 2 and 1.9 times as much as P25, respectively. Based on the photo/electrochemical results, an efficient photo-generated electron-hole separation contributes to the enhancement of photocatalytic H 2 evolution upon the Cu@TiO 2 hybrid. When replacing octahedral Cu 2 O with cubic and truncated octahedrons ones, the Cu@TiO 2 hybrid photocatalysts are also obtained and they also display superior solar-to-hydrogen evolution than pure TiO 2 and P25. It is expected this work could develop an approach to design Cu-encapsulated hybrid photocatalysts for hydrogen generation .
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 23
·8380
·
IF 3.748
Chen Chu,Jinqiong Tang,Zhiyang Zhao,Yong Kong,Xiaodong Shen
Aerogels have interconnected networks and preeminent pore structures. When used as the catalysts for oxygen reduction reaction (ORR), they can facilitate the mass transfer and expose more active sites. Here, we synthesized the Fe-doped titanium oxide-based aerogels (TA/Fes) by the sol–gel method combined with thermal treatment. The specific surface areas of the TA/Fes ranged from 475 to 774 m2·g−1, and the pore volumes varied from 0.96 to 1.72 cm3·g−1. The doping effect of the Fe ions and the oxygen vacancies in anatase enhance the electrical conductivity, leading to the low Rct (313.3–828.2 Ω). All samples showed excellent stability (2.0–4.5 mV) and 4e−pathway. The limiting current density of TA/Fe3 reached 5.34 mA·cm−2, which was comparable to that of commercial Pt/C. The preparation method is inspiring and the as-prepared aerogel catalysts have potential in promoting the scale of fuel cells.Keywords:TiO2aerogel;Fe ion doping;oxygen vacancy;pore structure;catalysis;ORR
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
危险品化学品经营许可证（带存储）