Nanoscale
·
2024
·Vol. 16
·期 22
·10727-10736
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IF 5.8
Peijiao Chen,Zhijun Li,Pengze Wang,Yuxin Yao,Tianwei Dou,Yang Qu,Liqiang Jing
The photocatalytic water-mediated CO2 reduction reaction, which holds great promise for the conversion of CO2 into valuable chemicals, is often hindered by inefficient separation of photogenerated charges and a lack of suitable catalytic sites. Herein, we have developed a glycerol coordination assembly approach to precisely control the distribution of atomically dispersed Cu species by occupying Ti-defects and adjusting the ratio between Cu species and Ti-defects in a hierarchical TiO2. The optimal sample demonstrates a ∼4-fold improvement in CO2-to-CO conversion compared to normal TiO2 nanoparticles. The high activity could be attributed to the Ti defects, which enhance the photogenerated charge separation and simultaneously facilitate the adsorption of water molecules, thereby promoting the water oxidation reaction. Moreover, by means of in situ EPR and FTIR spectra, we have demonstrated that Cu species can effectively capture photogenerated electrons and facilitate the adsorption of CO2, so as to catalyze the reduction of CO2. This work provides a strategy for the construction of atomic-level synergistic catalytic sites and the utilization of in situ techniques to reveal the underlying mechanism.
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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产品关联
DOI
PubMed
高影响因子
Advanced Science
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2025
·
IF 14.1
Chaofeng Wang,Shuilin Wu,Congyang Mao,Liguo Jin,Hanpeng Liu,Yufeng Zheng,Chunyong Liang,Shengli Zhu,Zhaoyang Li,Hui Jiang,Xiangmei Liu
Sonodynamic therapy (SDT) is recognized as an effective method for treating deep tissue bacterial infections, but enhancing charge transfer to achieve efficient SDT remains a formidable challenge. Here, deficient TiO 2 (DTO) is fabricated and Barium titanate (BTO) heterojunction with oxygen vacancies (OVs) and abundant Ti 3+ species on a Ti substrate. The OVs in DTO not only narrow the band gap of TiO 2 but also expedite the transfer of surrounding electrons to Ti 3+ . Meanwhile, the spin-polarization effect induced by the unpaired spin electrons in Ti atoms can expedite the transfer of ultrasonic piezoelectric charges in BTO, enhancing surface sonocatalytic efficiency. Consequently, the DTO/BTO with US irradiation can eradicate 99.82% of Staphylococcus aureus and inhibit biofilm formation. Additionally, the microcurrent generated by ultrasound-excited DTO/BTO enhanced mitochondrial fusion and promoted osteoblastic differentiation. The successful application of this ultrasound-mediated DTO/BTO in treating bone infection defects offers an effective antibiotic-free therapeutic strategy for deep-seated infections.
研究领域:
生物医学工程
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材料科学
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微生物学
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DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2024
·
IF 5.3
Zhiwen Shi,Lijuan Qiao,Zhi Jia,Peng Zhang,Bingxin Liu,Li Gao
It is of great significance to detect methanol in human exhaled breath since it may cause neurological disorders. In this study, N-doped Ti 3 C 2 T x MXene was synthesized by annealing and nitrogen doping in clay-like Ti 3 C 2 T x MXene. Then, TiO 2 nanospheres was generated in situ on the surface of N-doped Ti 3 C 2 T x MXene to provide adsorption and reaction sites for methanol. Based on the synergistic effects of electronic properties and gas adsorption, the N-Ti 3 C 2 T x MXene/TiO 2 exhibits high responsiveness and excellent selectivity to methanol at room temperature. Moreover, the detection limit is 0.1194 ppm. In addition, the adsorption and oxidation process of methanol on the N-Ti 3 C 2 T x MXene/TiO 2 was explored by in situ infrared spectra testing to reveal that the oxygen vacancy on the surface of N-Ti 3 C 2 T x MXene/TiO 2 plays an important role in the selective detection of methanol. This experiment provides a feasible solution for the detection of methanol gas in exhaled breath at room temperature.
研究领域:
材料科学
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医学诊断
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Shuojian Su,Yanna NuLi,Zhenguo Huang,Qi Miao,Jun Yang,Jiulin Wang
Mg2+/Li+ hybrid batteries have recently been constructed combining a Mg anode, a Li+-intercalation electrode, and an electrolyte containing both Mg2+ and Li+. These batteries have been reported to outperform all the previously reported magnesium batteries in terms of specific capacity, cycling stability, and rate capability. Herein, we report the outstanding electrochemical performance of Mg2+/Li+ hybrid batteries consisting of a one-dimensional mesoporous TiO2(B) cathode, a Mg anode, and an electrolyte consisting of 0.5 mol L–1 Mg(BH4)2 + 1.5 mol L–1 LiBH4 in tetraglyme. A highly synergetic interaction between Li+ and Mg2+ ions toward the pseudo-capacitive reaction is proposed. The hybrid batteries show superior rate performance with 130 mAh g–1 at 1 C and 115 mAh g–1 at 2 C, together with excellent cyclability up to 6000 cycles.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 12
·983
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IF 3.504
Shiman He,Yuying Meng,Yangfei Cao,Senchuan Huang,Jingling Yang,Shengfu Tong,Mingmei Wu
TiO2is one of the most attractive semiconductors for use as a photoanode for photoelectrochemical (PEC) water oxidation. However, the large-scale application of TiO2photoanodes is restricted due to a short hole diffusion length and low electron mobility, which can be addressed by metal doping and surface decorating. In this paper we report the successful synthesis of hierarchical Ta doped TiO2nanorod arrays, with nanoparticles on the top (Ta:TiO2), on F-doped tin oxide (FTO) glass by a hydrothermal method, and its application as photoanodes for photoelectrochemical water oxidation. It has been found that the incorporation of Ta5+in the TiO2lattice can decrease the diameter of surface TiO2nanoparticles. Ta:TiO2-140, obtained with a moderate Ta concentration, yields a photocurrent of ∼1.36 mA cm−2at 1.23 V vs. a reversible hydrogen electrode (RHE) under FTO side illumination. The large photocurrent is attributed to the large interface area of the surface TiO2nanoparticles and the good electron conductivity due to Ta doping. Besides, the electron trap-free model illustrates that Ta:TiO2affords higher transport speed and lower electron resistance when under FTO side illumination.Keywords:hierarchical TiO2;Ta doping;charge separation;photoelectrochemical water oxidation
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
PubMed
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 16
·期 24
·12521-12534
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IF 4.198
Quan Gu,Jinlin Long,Huaqiang Zhuang,Chaoqiang Zhang,Yangen Zhou,Xuxu Wang
A variety of ternary nanoheterostructures composed of Pt nanoparticles (NPs), SnOx species, and anatase TiO2 are designed elaborately to explore the effect of interfacial electron transfer on photocatalytic H2 evolution from a biofuel–water solution. Among numerous factors controlling the H2 evolution, the significance of Pt sites for the H2 evolution is highlighted by tuning the loading procedure of Pt NPs and SnOx species over TiO2. A synergistic enhancement of H2 evolution can be achieved over the Pt/SnOx/TiO2 heterostructures formed by anchoring Pt NPs at atomically-isolated Sn-oxo sites, whereas the Pt/TiO2/SnOx counterparts prepared by grafting single-site Sn-oxo species on Pt/TiO2 show a marked decrease in the rate of H2 evolution. The characterization results clearly reveal that the synergy of Pt NPs and SnOx species originates from the vectorial electron transfer of TiO2 → SnOx → Pt occurring on the former, while the latter results from the competitive electron transfer from TiO2 to SnOx and to Pt NPs.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 36
·17277-17290
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IF 4.682
Wan Xiang,Wang Jiafei,Wang Dian,Xu Qin,Xie Fazhi,Qu Qishu
In a mixed solvent composed of acetonitrile and ethanol, tetrabutyl orthotitanate (TBOT) was quickly introduced into the pores of the core–shell silica particles (SiO 2 @ d SiO 2 ) using the coordination bond formed between N and Ti. Since all the hydrolysis reactions of TBOT occurred in the pores, SiO 2 @ d SiO 2 spheres coated with TiO 2 (S@S@TiO 2 ) with an effective loading of TiO 2 as high as 74% were obtained. Because all TiO 2 nanoclusters are located in the pores, their growth is restricted by the pores. So the size of crystalline grains in the pores of the shell slowly increases with the increase in the calcination temperature. Due to the confined growth of TiO 2 nanoclusters, S@S@TiO 2 still maintains the anatase phase when the calcination temperature is as high as 1050 °C, which is significantly higher than the maximum thermal stability temperature of 900 °C reported in the literature. When used as photocatalysts for the degradation of Rhodamine B under UV irradiation, the catalytic activity of S@S@TiO 2 calcined at 950 °C is 2.1 times higher than that of the commercial P25 TiO 2 photocatalyst. Graphical abstract
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Guangyang Wang,Shaobai Sang,Qinghu Wang,Yawei Li,Heng Wang,Tianbin Zhu
MgCr 2 O 4 is a potential infrared radiation material for high-temperature furnaces energy-saving. However, poisonous Cr 6+ is easily formed in MgCr 2 O 4 -based materials during the preparation process, which is harmful to the environment. In this study, TiO 2 -doped MgCr 2 O 4 materials were prepared at 1600 ℃ by solid-phase sintering method. The effects of TiO 2 as a dopant on the infrared radiation properties of MgCr 2 O 4 and the leaching concentration of Cr 6+ were investigated, and the mechanism was discussed. Results show that the emissivity of MgCr 2 O 4 in both near-infrared and mid-infrared bands is enhanced with the increase of TiO 2 content, and the specimen MgCr 1.6 Ti 0.4 O 4.2 has the highest average emissivity in the 0.8–2.5 μm and 2.5–10.0 μm bands, which are 0.82 and 0.87, respectively. Moreover, the addition of TiO 2 significantly reduces the Cr 6+ content of MgCr 2 O 4 , with the Cr 6+ removal rate of MgCr 1.6 Ti 0.4 O 4.2 up to 84.2 %.
研究领域:
材料科学
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能源工程
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ruiui Hao,Kaijia Zhang,Guohong Wang
Developing a low-cost, stable but efficient heterojunction photocatalyst is very crucial and challenging. A multivalent TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst with active copper center has been prepared by a simple solvothermal method. In the photocatalytic process, photogenerated electrons produced by TiO 2 are transferred to the copper center in Cu 3 (BTC) 2 , partially reducing Cu 2+ and forming a highly active Cu 2+ /Cu + mixed center. This electron transfer path effectively increases the carrier density and prolongs the lifetime of the photogenerated charge. Under the optimal composite ratio, the hydrogen production activity of the TiO 2 @Cu 3 (BTC) 2 heterojunction photocatalyst was significantly enhanced, exceeding that of TiO 2 (8.39 μmol·g −1 ·h −1 ) by a factor of 72.2 times, and overcoming the barrier of no hydrogen production activity in pure Cu 3 (BTC) 2 . Additionally, the heterojunction photocatalyst demonstrated excellent chemical and photocatalytic stability over a period of at least 200 days. The enhanced photocatalytic activity is attributed to the improved visible light absorption efficiency, the effective heterojunction interfaces, particularly the highly active Cu 2+ /Cu + mixed center formed. Importantly, noble metal was not used in the photocatalytic hydrogen production process. Instead, Cu 2+ /Cu + were employed as active centers, making it possible to synthesize low-cost photocatalysts. This work provides conceptual guidance for the development of highly efficient multivalent TiO 2 -based heterojunction photocatalysts.
研究领域:
材料科学
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能源化学
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光催化技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Shuai Liu,Yang Meng,Chunlin Luo,Huiwen Zhu,Yunshen Song,Honglei Zhang,Tao Wu
The emergence of global warming issues has triggered the interest in producing carbon-neutral energy sources and fossil-based chemicals from affordable and renewable feedstocks (e.g., bio-ethanol). Herein, the synthesis of highly dispersed CuS/TiO 2 photothermal catalysts is reported for simultaneously converting ethanol into hydrogen and acetaldehyde under simulated sunlight. The catalyst achieved a hydrogen evolution rate of 51.61 mmol g −1 h −1 and an acetaldehyde production rate of 48.63 mmol g −1 h −1 , with a maximal acetaldehyde selectivity of 97% among carbon-containing products. Compared to pristine TiO 2 , the introduction of plasmonic CuS largely extended the light adsorption range and enhanced the photothermal performance, whilst the formation of heterojunction structure improved the charge transfer and separation efficiency. The density functional theory calculation results demonstrate that CuS/TiO 2 composite interfaces could significantly lower the activation energy of ethanol dehydrogenation reaction and improve hydrogen evolution reaction ability. This study provides deep insight into understanding and optimizing hot carrier dynamics in photothermal catalytic systems.
研究领域:
能源化学
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催化材料科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 6
·1755-1765
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IF 2.482
Meng Fanyu,Zhang Mingjia,Zhou Fayang,Zou Haocheng,Zhu Boming,Zeng Yiqing,Zhang Shule,Zhong Qin
Abstract CrO x /black-TiO 2 catalysts were prepared by ligand-assisted (citric acid, oxalic acid and ethylenediaminetetraacetic acid) impregnation method. These catalysts were characterized in detail by means of X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, H 2 and O 2 (NO) temperature programmed reduction or desorption and in-suit DFTIR spectra. The results indicated that ligands assistance was beneficial for CrO x interacted with oxygen vacancies and O–Ti–O structures. Among all the catalysts, CrO x /black-TiO 2 /CA (modified by citric acid) revealed excellent catalytic activity and stability for NO oxidation in the temperature range of 200–450 °C. The characterization results exhibited that the interaction existed between CrO x and oxygen vacancies resulting in more Cr 6+ . Moreover, the strong interaction between CrO x and O–Ti–O was attributed to the modification of carboxylic acid, which increased the content of Cr 3+ and chemical adsorption oxygen. High content of chemical adsorption oxygen promoted the adsorption ability of O 2 , and Cr 6+ enhanced the adsorption capacity of NO. Hence, chemical adsorption oxygen and Cr 6+ synergistically promoted the NO oxidation. Graphic Abstract
研究领域:
催化材料科学
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环境化学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
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IF 6.5
Cailing Wu,Mingming Sun,Xinyang Gao,Qifei Huang,Zhaojun Min,Yanxing Zhang,Jianji Wang
Single atom catalysts (SACs) supported on metal oxide are usually prepared at high temperature, high pressure, and complex process. Herein, a new strategy is developed to prepare SACs anchored on vacancy-rich TiO 2 using Ti 2 O 3 as the support precursor under mild conditions, where Ti 3+ on Ti 2 O 3 surface acts as “traps” to capture and then reduce metal ions through electron transfer without using reducing agents. This approach is universally applicable for different single metal atoms supported on diverse phases of TiO 2 (anatase, rutile, metastable and mixed counterpart). The as-obtained Pt 1 /TiO 2 with controllable Pt loading and multiple oxygen vacancies (Ov) exhibits excellent activity in photocatalytic H 2 evolution. At optimal conditions, the H 2 evolution rate is up to 95,180 μmol g −1 h −1 , which is the highest for TiO 2 supported SACs reported.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
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