Small
·
2023
·Vol. 19
·期 38
·2302831
·
IF 13.3
Tianhao Yao,Hongkang Wang,Xin Ji,Deyu Wang,Qingmiao Zhang,Lingjie Meng,Jian-Wen Shi,Xiaogang Han,Yonghong Cheng
Titanium dioxide (TiO 2 ) is a promising anode material for sodium–ion batteries (SIBs), which suffer from the intrinsic sluggish ion transferability and poor conductivity. To overcome these drawbacks, a facile strategy is developed to synergistically engineer the lattice defects (i.e., heteroatom doping and oxygen vacancy generation) and the fine microstructure (i.e., carbon hybridization and porous structure) of TiO 2 -based anode, which efficiently enhances the sodium storage performance. Herein, it is successfully realized that the Si-doping into the MIL-125 metal-organic framework structure, which can be easily converted to SiO 2 /TiO 2–x @C nanotablets by annealing under inert atmosphere. After NaOH etching SiO 2 /TiO 2–x @C which contains unbonded SiO 2 and chemically bonded Si O Ti, thus the lattice Si-doped TiO 2–x @C (Si-TiO 2–x @C) nanotablets with rich Ti 3+ /oxygen vacancies and abundant inner pores are developed. When examined as an anode for SIB, the Si-TiO 2–x @C exhibits a high sodium storage capacity (285 mAh g −1 at 0.2 A g −1 ), excellent long-term cycling, and high-rate performances (190 mAh g −1 at 2 A g −1 after 2500 cycles with 95.1% capacity retention). Theoretical calculations indicate that the rich Ti 3+ /oxygen vacancies and Si-doping synergistically contribute to a narrowed bandgap and lower sodiation barrier, which thus lead to fast electron/ion transfer coefficients and the predominant pseudocapacitive sodium storage behavior.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
电池技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jingtao Zhang,Mengwan Zhai,Xueying Wang,Shurui Liu,Lijuan Zhang,Xing Liu,Yao Geng,Xiaodong Sun,Bingkun Liu
In the present work, Ti 3+ -self-doped TiO 2 heterostructure photocatalysts were prepared by coupling with different additions of palladium quantum dots by means of deposition-reduction methodology. The electron paramagnetic resonance (EPR) analysis indicated the existence of Ti 3+ in synthesized samples. The transmission electron microscopy (TEM) images presented the modification of TiO 2-x nanoparticles by coupling with nano palladium. Photoluminescence (PL) results demonstrated the lowest charge carrier recombination rate in 5% Pd/TiO 2-x composites. Photocatalytic performances of photocatalysts were evaluated by degrading Tetracycline (TC) and inactivating Escherichia coli ( E. coli ) and Fusarium oxysporum f. sp. Vasinfectum ( Fov ) with the presence of visible light , in which an enhanced photocatalytic degradation and inactivation activity was found in all Pd coupled composites with the highest efficiency in 5% Pd/TiO 2-x . The improved photocatalytic activity of Pd/TiO 2-x was associated to the generation of more hydroxyl radicals (•OH) and superoxide anions radicals (•O 2- ) during photocatalytic process which were demonstrated by the electron spin-resonance spectroscopy (ESR) technique. Moreover, 5% Pd/TiO 2-x composites were found to remain high photocatalytic properties in a circulating photo-disinfection system.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
光催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Lina Lin,Qilan Zhong,Yunzhe Zheng,Yan Cheng,Ruijuan Qi,Rong Huang
A model system of oxygen vacancy modified titanium dioxide (TiO 2-x ) nanobelts supported Au nanoparticles with different sizes is prepared for methylene blue photodegradation. The Au/TiO 2-x heterostructure with the smallest Au size exhibits the best performance than other samples. Based on detailed microstructural investigations, the effect of Au particle size on the photocatalytic performance is revealed in the view points of electron transfer mechanism and interface microstructure. It implicates that although the size effect determines the overall photoelectric properties of samples, it is the number and transport behavior of carriers at the interface that fundamentally affect the photocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yifeng Liu,Ming Peng,Kaiwen Gao,Rong Fu,Shiyun Zhang,Yueyuan Xiao,Jinghui Guo,Zhaoyang Wang,Hairen Wang,Yan Zhao,Qijun Wang
Semiconductor photocatalysis holds great promise as a method for addressing the issue of antibiotic pollution in water. However, the wide band gap and low carrier separation rate present significant challenges that restrict the water purification efficiency of photocatalytic materials. In this study, a novel TiO 2-x /TiN@C heterojunction was prepared through a typical hydrothermal synthesis and carbon thermal reduction approach, which was utilized for the photocatalytic degradation of levofloxacin (LEV) antibiotics. TiO 2-x contains various titanium oxides, including TiO 2 , Ti 2 O 3 , and Ti 3 O 5 , and possesses a narrow band gap, enabling efficient absorption of visible light. The visible light absorption ability is further enhanced when it forms a heterojunction with plasmonic titanium nitride, which exhibits good carrier separation ability. The results demonstrated that the degradation efficiency of TiO 2-x /TiN@C for levofloxacin under visible light irradiation was significantly superior to that of TiO 2-x @C and TiN without a heterostructure. Characterization tests and mechanistic analysis have revealed that the coupling of the heterostructure with localized surface plasmon resonance (LSPR) enhances photocatalytic activity . Additionally, the combination of photocatalysis with advanced oxidation methods has exhibited excellent catalytic degradation performance. This research provides novel insights into fabricating efficient LSPR-enhanced photocatalytic systems and a comprehensive understanding of the degradation pathways for LEV.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 16
·2190-2200
·
IF 8.683
Chengguang Liu,Xiaolei Guo,Zhen-Feng Huang,Jinheng Li,Li Gan,Lun Pan,Chengxiang Shi,Xiangwen Zhang,Guidong Yang,Ji-Jun Zou
Due to the utilization of renewable energy and proton sources, the electrochemical nitrogen reduction reaction is considered as an efficient, sustainable, and carbon-neutral route to replace the industrial Haber–Bosch process. However, restricted by the highly competitive hydrogen evolution reaction and the highly inert NN bond, electrochemical nitrogen reduction research still faces significant challenges with a low level of selectivity and activity. Herein, we demonstrate a catalyst (PdCu/TiO2−x) composed of oxygen vacancy-rich TiO2−x nanosheets and PdCu alloy nanoparticles by the co-reduction method of metal precursors. Such a catalyst exhibits excellent electrocatalytic performance at room temperature and pressure, with an NH3 yield rate of 8.51 mmol gcat−1 h−1 and the corresponding faradaic efficiency of 49.09% at −0.1 V vs. the reversible hydrogen electrode, which are much higher than most reported palladium-based catalysts and their alloy catalysts. Characterization and experimental results confirm that by properly constructing the surface defect and nanoalloy structure, the optimized electronic structure and synergistic effect can not only effectively improve the N2 adsorption and activation, but also reduce the reaction barrier, resulting in efficient electrocatalytic performance. Meanwhile, the introduction of Cu accelerates the hydrogen desorption, further effectively improving the faradaic efficiency. Overall, we explored the electrocatalytic performance and mechanism of the bimetal alloy catalyst, as well as the optimization strategies for enhancing the nitrogen mass transfer process, providing new insight into the rational design of a highly efficient e-NRR system through tuning of the catalyst and reaction environment.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Science & Engineering
·
2025
·
IF 3.4
Zhangyang Li,Chunling Wang,Daoping He,Fangming Jin
Photocatalytic biomass valorization toward multicarbon chemicals holds promise for sustainable energy solutions. Nevertheless, this approach suffers from dual challenges: inherent instability of polyhydroxy intermediates and inefficient formic acid production under ambient conditions. Here, we demonstrated that a TiO 2-x photocatalyst with oxygen vacancies can effectively catalyze the transformation of glucose into arabinose, erythrose, and formic acid using O 2 as an oxidant in pure water under natural sunlight irradiation. The C 1 −OH group of glucose adsorbed on the oxygen vacancies of TiO 2-x undergoes photo-induced hole oxidation, leading to the formation of gluconolactone-TiO 2-x as a new motif. Subsequent cleavage of bonds by ·OOH radicals generated from oxygen reduction produces arabinose, erythrose, and formic acid. The oxygen vacancy strategy achieves a remarkable 53.9% yield for glucose oxidation, which exhibits 10.8-fold enhancement compared to that of conventional TiO 2 without oxygen vacancies, thereby opening new avenues for developing efficient photocatalytic systems for sustainable biomass valorization.
研究领域:
光催化
·
生物质转化
·
材料科学
·
环境化学
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Rongjie Zhe,Haoyun Dou,Xuanpan Xu,Ziwei Zhao,Long Chen,Qingye Zhao,Xinjun Bao,Guozhong Cao,Hong-En Wang
The shuttling and sluggish conversion kinetics of lithium polysulfides (LiPSs) lead to poor cycling performance and low energy efficiency in lithium-sulfur batteries (LSBs). In this work, a hierarchically structured nanocomposite, synthesized through a surfactant-directed hydrothermal growth following dopamine-protected pyrolysis, serves as a bidirectional catalyst for LSBs. This nanocomposite comprises N -doped reduced graphene oxide (rGO) nanosheets anchored with uniformly distributed TiO 2- x nanoparticles via interfacial N -Ti and C-Ti bonding, resulting in the formation of abundant 2D/0D Schottky heterojunctions (rGO/TiO 2- x ). Density functional theory (DFT) calculations and in situ Raman characterizations demonstrate that rGO/TiO 2- x effectively inhibits the shuttling of LiPSs with enhanced redox kinetics, achieving high utilization of the sulfur cathode and improving the overall reversibility. A high areal capacity is attained at a high sulfur loading and a low electrolyte/sulfur ratio. The initial specific capacity reaches 1010 mA h g −1 at a current density of 0.2C (1C = 1675 mA g −1 ), and a retention of 86.4 % is attained over 100 cycles. A light-emitting diode (LED) screen using two LSBs with rGO/TiO 2- x demonstrates their high potential for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Yan Cao,Zipeng Xing,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Tianyu Zhao,Ziyuan Xiu,Shilin Yang,Wei Zhou
Mesoporous black N-TiO 2−x hollow spheres are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process, coupled with an etching procedure and an in-situ solid-state chemical reduction strategy. The resultant black N-TiO 2−x hollow spheres with high crystallinity possess a narrow band gap of ∼2.37 eV, a large specific surface area of ∼128 m 2 g −1 , and a well defined hollow sphere structure, which exhibit excellent visible-light-driven photocatalytic performance for degradation of phenol , reduction of Cr(IV), and hydrogen production . The photocatalytic reaction apparent rate constants (k) of the black N-TiO 2−x for phenol degradation and Cr(IV) reduction are ∼5 and 6 times higher than that of pristine TiO 2 , and hydrogen production rate for N-TiO 2−x is ∼160 μmol h −1 , which is ∼7 folds higher than that of pristine one. The excellent photocatalytic and photoreduction property can be attributed to the synergy effect of N and Ti 3+ codoping narrowing the band gap, the high specific surface area offering more surface active sites, and the mesoporous hollow structure favoring light harvesting and refraction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Shuang Zhou,Da Wen,Wei Zhong,Jianjun Zhang,Yaorong Su,Aiyun Meng
The effective adsorption of oxygen (O 2 ) molecules over photocatalysts is a critical step in promoting the performance of photocatalytic H 2 O 2 production. However, g-C 3 N 4 usually features a Yeager-type (side-on) adsorption configuration of O 2 molecules, which causes the breaking of O–O bonds and severely hinders the H 2 O 2 production activity. Herein, we synthesized an oxygen-vacancy-rich TiO 2– x /g-C 3 N 4 step-scheme (S-scheme) heterojunction to regulate the oxygen adsorption configuration and improve the 2e – ORR selectivity of H 2 O 2 production. In-situ X-ray photoelectron spectroscopy (in-situ XPS) and density functional theory (DFT) calculations reveal that the S-scheme heterojunction is formed between TiO 2– x and g-C 3 N 4 . The difference between their Fermi levels leads to the electron flow from g-C 3 N 4 to TiO 2– x , which increases the electron-deficient sites in g-C 3 N 4 . As a result, the cleavage of O–O bonds on the surface of g-C 3 N 4 is avoided and the oxygen adsorption configuration is tuned from Yeager-type to Pauling-type (end-on). Consequently, the photocatalytic H 2 O 2 production rate is dramatically improved to 1780.3 μmol h –1 , which is about 5 times higher than that of pristine g-C 3 N 4 . This work paves a new way to tailor the oxygen adsorption configuration by rationally designing S-scheme heterojunction photocatalysts.
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
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 43
·18558-18568
·
IF 2.7
Ali Baqaei,Ali Asghar Sabbagh Alvani,Hassan Sameie,Federico Rosei
We designed and fabricated a photocatalyst made of reduced titanium dioxide nanorods (TiO2−x NRs) that incorporates silver nanoparticles (Ag NPs) and reduced graphene oxide (rGO) sheets, to narrow the band gap and improve the photoinduced degradation of methylene blue (MB). The morphological characterization showed that Ag NPs and rGO sheets were well-deposited on both the top surface and the outer walls of vertically oriented 1D TiO2−x NRs. Energy dispersive spectroscopy and specific surface area analyses confirmed the presence of both Ag NPs and rGO sheets and the as-obtained TiO2−x/Ag/rGO sample exhibited a large specific surface area (153.7 m2 g−1). Moreover, X-ray diffraction patterns contained peaks characteristic of tetragonal rutile TiO2 and confirmed that there is no phase change after reduction treatment. The optical investigation revealed that the formation of Ti3+ ions, surface defects and oxygen vacancies were considered as major reasons for the red shift of the absorption edge towards the visible region (546 nm) compared with pristine TiO2 NRs. The incorporation of Ag NPs and rGO with TiO2−x NRs improved the light absorbance and the narrowing of the TiO2−x bandgap energy (from 2.95 to 1.97 eV) as a result of the SPR effect of Ag NPs and the reduced light reflection in the presence of rGO. Therefore, among the various as-prepared photocatalysts, the TiO2−x/Ag/rGO (2% wt) photocatalyst showed the best performance, degrading almost 100% of MB under 120 min visible light irradiation. Kinetic studies confirmed that degradation reactions over all photocatalysts followed first order kinetics. The photodegradation rate toward MB over TiO2−x/Ag/rGO (2% wt) is 6.45, 1.85, and 1.6 times higher compared to that of pristine TiO2 NRs, TiO2−x and TiO2−x/Ag, respectively. The TiO2−x/Ag/rGO composite proves to be an exceptionally efficient photocatalyst for water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Qing Guan,Sara Khan,Zhaohua Wang,Qian Liu,Leilei Zhang,Yongjie Zhao,Xianze Wang,Xia Yang,Zhi Geng
A critical issue in the removal of fluoroquinolone antibiotics, which were frequently detected in drinking water sources and water treatment plants, is the design of highly efficient photocatalysts . In order to utilize visible-light, improve the electrons transfer and reduce the recombination of photogenerated carriers, TiO 2-X /Ag 3 PO 4 heterojunctions were fabricated by hydrothermal technology combined with the coprecipitation method for the first time. The morphological, structural, and optical properties of as-prepared catalysts were extensively characterized. In comparison with single-phase TiO 2-X and Ag 3 PO 4 , TiO 2-X /Ag 3 PO 4 composite exhibited enhanced photocatalytic efficiency for the degradation of methyl orange (MO) and gatifloxacin (GAT). Especially for the composite with the mole ratio of TiO 2-X and Ag 3 PO 4 was 1:1, the reduction of antimicrobial activity of the GAT byproducts reached 82.4% after 5 min visible-light irradiation. Furthermore, the pathway in photocatalytic decomposition of GAT was proposed by HPLC-MS and the electron transfer mechanism over TiO 2-X /Ag 3 PO 4 heterojunctions was suggested by the radical capture experiments, transient photocurrent responses, and electrochemical impedance spectroscopy tests.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xinwei Li,Haiwei Li,Yu Huang,Junji Cao,Tingting Huang,Rong Li,Qian Zhang,Shun-cheng Lee,Wingkei Ho
To understand the conversion mechanism of photocatalytic gaseous formaldehyde (HCHO) degradation, strontium (Sr)-doped TiO 2– x –OV catalysts was designed and synthesized in this study, with comparable HCHO removal performance. Our results proved that foreign-element doping reduced Ti 4+ to the lower oxidation state Ti (4– x )+ , and that the internal charge kinetics was largely facilitated by the unbalanced electron distribution . Oxygen vacancies (OVs) were developed spontaneously to realize an electron-localized phenomenon in TiO 2– x –OV, thereby boosting O 2 adsorption and activation for the enhanced generation of reactive oxygen species (ROS). At the chemisorption stage, in-situ DRIFTS spectra and density functional theory calculation results revealed that surface adsorbed O 2 (O ads ) and lattice O (O lat ) engaged in the isomerisation of HCHO to dioxymethylene (DOM) on TiO 2– x –OV and TiO 2 , respectively. Time-resolved DRIFTS spectra under light irradiation revealed that the DOM was then converted to formate and thoroughly oxidized to CO 2 and H 2 O in TiO 2– x –OV. While bicarbonate byproducts were detected from DOM hydroxylation or possible side conversion of CO 2 in TiO 2 , owing to insufficient consumption of surface hydroxyl. Our study enhances the understanding on the photocatalytic oxidation of HCHO, thereby promoting the practical application in indoor air purification .
研究领域:
环境科学
·
材料科学
✓ 已验证
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）