CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Caiqin Wang,Cheng Qian,Ting Hu,Xiaofei Yang
It is significant to promote the efficiency of solar fuel cells via improving the utilization of solar in photoelectrocatalysis. In this work, hydrogenated TiO 2 (H-TiO 2 ) nanoparticles with Ti 3+ and/or oxygen vacancy (V O ) defects were obtained and have extended light absorption to visible light region. As a photochemical component, H-TiO 2 was further coupled with Au nanoparticles to assemble photoelectrocatalyst to apply in photo-assisted electrooxidation of ethanol. Due to the existence of defects in H-TiO 2 , the peak current density on Au/H-TiO 2 is improved by 5.4% with the assistance of light irradiation, and even up to 18.3% under simulated sunlight illumination, which is much higher than that on Au/W-TiO 2 (W-TiO 2 loaded Au) under the light irradiation. Meanwhile, it is demonstrated that the charge transfer is improved on Au/H-TiO 2 with Vo due to the existence of Vo, improving the separation of excited electrons and holes. Density function theory (DFT) based theoretical calculations illustrate that the energy barrier of reaction intermediates on Au-TiO 2 with Vo defects is lower than that without Vo, indicating that Au-TiO 2 with Vo is more energetically favorable. This work highlights the possibility of using defective semiconductor nanomaterials to combine photocatalysis and electrocatalysis in solar fuel cells and to further improve the efficiency of fuel cells under solar full spectrum.
研究领域:
材料科学
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能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2801
·
IF 5.076
Guang Feng,Mengyun Hu,Shuai Yuan,Junyi Nan,Heping Zeng
Hydrogenated crystalline TiO2with oxygen vacancy (OV) defect has been broadly investigated in recent years. Different from crystalline TiO2, hydrogenated amorphous TiO2−xfor advanced photocatalytic applications is scarcely reported. In this work, we prepared hydrogenated amorphous TiO2−x(HA-TiO2−x) using a unique liquid plasma hydrogenation strategy, and demonstrated its highly visible-light photoactivity. Density functional theory combined with comprehensive analyses was to gain fundamental understanding of the correlation among the OVconcentration, electronic band structure, photon capturing, reactive oxygen species (ROS) generation, and photocatalytic activity. One important finding was that the narrower the bandgap HA-TiO2−xpossessed, the higher photocatalytic efficiency it exhibited. Given the narrow bandgap and extraordinary visible-light absorption, HA-TiO2−xshowed excellent visible-light photodegradation in rhodamine B (98.7%), methylene blue (99.85%), and theophylline (99.87) within two hours, as well as long-term stability. The total organic carbon (TOC) removal rates of rhodamine B, methylene blue, and theophylline were measured to 55%, 61.8%, and 50.7%, respectively, which indicated that HA-TiO2−xexhibited high wastewater purification performance. This study provided a direct and effective hydrogenation method to produce reduced amorphous TiO2−xwhich has great potential in practical environmental remediation.Keywords:hydrogenated TiO2−x;oxygen vacancy;hydrogenation;liquid plasma;band structure
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 9
·683
·
IF 4.3
Hairui Cai,Benjamin Yang,Jie Hou,Ziqi Wang,Zhuo Li
Formaldehyde, a pervasive indoor air pollutant posing significant health risks, has driven extensive research into advanced mitigation strategies to ensure safer living environments. Herein, this study presents a synthesis method for the large-scale production of hydrogenated TiO2(P25) loaded with PtAu nanoalloys (P25(H)-PtAu), using a combination of ball milling and high-temperature annealing. Hydrogenation-induced defect-rich TiO2efficiently improves visible light absorption, enhancing the utilization of visible light in photocatalytic reactions. Mechanochemical ball milling was employed to prepare ultrasmall PtAu nanoalloys with a size of 3.7 ± 0.1 nm, which were uniformly dispersed on the surface of P25(H). Density functional theory (DFT) results indicate that PtAu nanoalloys synergistically enhance charge separation via Schottky junctions and surface reaction kinetics by optimizing reactant adsorption. As a result, P25(H)-PtAu achieves industrially relevant formaldehyde removal efficiency (97.8%) under ambient light conditions while maintaining scalability (10 g batches). This work provides a scalable framework for developing manufacturable photocatalysts, with immediate applications in heating, ventilation and air conditioning systems, and air purifiers.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2022
·
IF 4.132
Ji Shi,Wenyu Huang,Hongxiang Zhu,Jianhua Xiong,Huiting Bei,Shuangfei Wang
Widespread application of TiO2 for degradation of antibiotics is restricted by mainly the low photodegradation efficiency under solar irradiation. To expand the application of TiO2, the key factors that should be improved are visible-light response, yield of electrons and holes, and durability. Herein, we report a visible-light responsive and durable sugarcane-bagasse-derived biochar supported hydrogenated TiO2 (HSCB/H2-TiO2) photocatalyst with higher electron production fabricated by a facile one-pot hydrogenation. Mild hydrogenation temperature preserved the lotus-stem-like structure of sugarcane bagasse and gave the photocatalyst great separability. The superior durability of HSCB/H2-TiO2 was demonstrated by 12 rounds of repeated degradation of methylene blue (MB). In addition, the electron paramagnetic resonance (EPR) results demonstrated that the biochar skeleton contains abundant persistent free radicals (PFRs), which can provide excess electrons to form more •O2–. Meanwhile, radical quenching experiment and EPR radical trapping results also revealed that •O2– was the most dominant species for enrofloxacin (ENR) degradation. Thus, the as-fabricated photocatalyst shows excellent solar-driven degradation of ENR, and 95.6% of ENR was degraded in 180 min under simulated solar irradiation. Possible ENR degradation pathways and mechanism are also proposed based on the identified intermediates.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Xiaoyu Li,Yujia Han,Yike Huang,Jian Lin,Xiaoli Pan,Ziang Zhao,Yanliang Zhou,Hua Wang,Xiaofeng Yang,Aiqin Wang,Lin Li,Botao Qiao,Xiaodong Wang
Selective methanation of CO (SMET) is promising for deep removal of low-concentration CO in excess H 2 . However, the development of suitable catalysts applied in practical conditions remains a great challenge. Here we report a general strategy to develop highly efficient SMET catalysts by using hydrogenated TiO 2 (H-TiO 2 ) as support. The H-TiO 2 supported Ru catalysts can remove CO to below 10 ppm with greater than 50 % selectivity in a wide temperature range of 200−265 °C, with a good long-term stability. Detailed characterizations including operando spectroscopy and in-situ XPS combined with DFT calculation revealed that the lowered Ru valance on H-TiO 2 strengthens CO adsorption on both metal surface and metal-support interface which improved CO activation and inhibited CO 2 hydrogenation, respectively, leading to enhancement of both activity and selectivity.
研究领域:
催化化学
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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
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 22
·18381-18387
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IF 3.201
Hang Cheong Chan,Ting Chen,Lifang Xie,Yijin Shu,Qingsheng Gao
As promising catalyst supports, hydrogenated metal-oxides can afford engineered surface architectures and electronic configurations to promote catalytic turnover on loading metals. Herein, hydrogenated TiO2 (H-TiO2) fabricated via NaBH4 reduction is successfully introduced to boost the catalytic oxidation of formaldehyde (HCHO), which is one of the most common and harmful indoor volatile organic compounds. Distinct from the parent TiO2, H-TiO2 features enriched surface hydroxyls and enhanced metal–support interactions upon loading Ir, which are responsible for remarkable promotion in HCHO oxidation. In particular, the abundant hydroxyls on H-TiO2 promote the generation of HCOO−, which is believed to be the rate-determining step in HCHO oxidation. This discovery is anticipated to pave the way for exploring high-performance metal catalysts on oxide supports via surface and interfacial engineering.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Qin Cheng,Azhu Wang,Zhimin Song,Jun Bao,Jiawei Xue,Yuxue Wei,Shikuo Li,Lingling Lv,Jianjun Ding,Mengdie Cai,Jingshuai Chen,Qi Wang,Chen Gao,Song Sun
Hydroxyl groups on the photocatalyst surface provide adsorption sites and starting species to form hydroxyl radicals , and are thus considered as the most important species for the photocatalytic degradation of toluene. However, the complete mineralization of toluene over TiO 2 photocatalysts is still challenging because of insufficient and unstable hydroxyl groups. Here, a hydrogenated TiO 2 nanotube array mesh (H-TiO 2 ) was fabricated. H-TiO 2 capable of trapping light and serving high surface areas for active sites exhibited a toluene mineralization conversion of 100%. It was found that surface distortion and oxygen vacancies ensured the chemical dissociative adsorption of water to generate sufficient isolated hydroxyls on the surface and subsurface and benefited the regeneration in long-term operations. This study may provide an efficient TiO 2 -based photocatalyst for the removal of volatile organic compounds for air purification and give comprehensive understandings of the photocatalyst surface modification and theoretical guidance for designing hydroxyl-demanding photocatalysts.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 10
·7703-7714
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IF 2.993
Xiong Yuli,Yang Lin,Xiao Peng,Yang Yannan
Charge separation and oxidation kinetics are both critical for solar energy conversion in photoelectrochemical cell, but it is difficult to enhance simultaneously by a semiconductor. Here, the hydrogenated TiO 2 loaded by Pt nanoparticles with improved charge separation and oxidation kinetics photoanodes are developed, characterized, and tested. The TiO 2 nanotubes are prepared by hydrothermal of Ti foils and used as substrates for hydrogenation and loaded by Pt through photodeposition. Ascribe to the synergetic of hydroxylated surface and Pt nanoparticles, the photocurrent of Pt/H:TiO 2 is enhanced from 0.052 (TiO 2 ) to 0.098 mA/cm 2 at 1.0 V versus RHE for water oxidation and almost increased 1.3 times for sulfite oxidation. Further, the electrons’ transport time has been reduced 20%, and the incident photon-to-electron conversion efficiency for Pt/H:TiO 2 has been increased by 2.5-fold for water oxidation under 350 nm illumination at 1.0 V versus RHE. The charge separation and oxidation kinetics efficiencies of Pt/H:TiO 2 are improved to 62.2 and 39.9% compared with pristine TiO 2 (54.2 and 27.6%) at 1.0 V versus RHE. The origin of the enhanced photoelectrochemical performances for Pt/H:TiO 2 is due to the hydroxylated surface and the absorption of plasmon resonance by Pt nanoparticles.
研究领域:
材料科学
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光化学
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纳米技术
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 32
·2401540
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IF 18.5
Shurui Cong,Jihai Cai,Xiaoyun Li,Junqin You,Lei Wang,Xiaoying Wang
TiO 2 photocatalysis has gained attention as a cost-effective way of degrading contaminants. However, it relies on UV excitation and experiences rapid carrier recombination. To address these drawbacks, novel xylan-based carbon dots@hydrogenated TiO 2 (CDs@TiO 2-x ) composited by direct Z-scheme heterojunction is fabricated as a visible light-driven photocatalytic material, which broadens the range of light absorption to visible light and suppresses the recombination of photogenerated carriers. The spindle-shaped CDs@TiO 2-x has C/N/O/S groups, positive charges, and oxygen vacancies on its surface, and can degrade 89% of methylene blue and 87% of methyl orange within 90 min, and 99% of rhodamine B within 60 min in visible light. It also eradicates 99.9% of E. coli in 2 h and 97.1% of S. aureus in 2.5 h. These performances surpass CDs and TiO 2-x , and exhibit advantages in similar composite materials. The degradation pathways of dyes and the specific antibacterial processes induced by ROS are thoroughly investigated through LC-MS testing and related enzyme activity assays. DFT calculations study the role of oxygen vacancies, heterojunction mechanism, and catalytic sites. This study has developed a novel nanocomposite with applications in both dye degradation and sterilization, offering insights for multifunctional materials based on photocatalysis and heterojunction.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光化学
·
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）