SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jiacheng Xi,Kai Liang,Niu Yao,Huiyu Yuan,Junyan Cui,Xinghui Hou
Hydrogen sulfide (H 2 S) is a toxic and flammable substance that its effective real-time detection has great significance for ensuring safety. Currently, the detection of low concentration H 2 S remains a challenge. In this paper, the 3D monoclinic-tetragonal mixed phase Mo/Bi- x with hierarchical structure has been successfully prepared by a simple one-step solid-phase method for low concentration H 2 S detection. The effect of Mo doping on its morphology, structure, composition and gas sensitivity of BiVO 4 has been investigated. XRD, SEM, TEM, Raman, UV–vis and XPS techniques are employed to explore the potential sensing mechanism. The results show that the addition of Mo leads to a gradual transformation of BiVO 4 from a class cube structure to a strip structure, accompanied by partial conversion of the monoclinic phase to the tetragonal phase. For the typical sample (Mo/Bi-0.1), it exhibits extremely high response ( R g / R a ) of 43.5–10 ppm H 2 S at 200 °C, high selectivity ( Q H 2 S / methanol = 7.15 ), rapid response and recovery time of 11/15 s and relatively low theoretical detection limit (20.5 ppb). This can be attributed to the presence of unique long plate structures, abundant oxygen vacancies, chemisorbed oxygen and a monoclinic-tetragonal phase heterojunction. This research provides a potential strategy for the design of other H 2 S sensitive materials.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Siyu Gong,Ting Zhang,Bingguo Liu,Peng Liu,Yifan Niu,Zhenxing Yang,Yuhao Jin,Wang Chen,Guangxiong Ji,Shenghui Guo,Libo Zhang
The study introduces a microwave-assisted rutile seed crystal (RS) method to synthesise mixed-phase TiO 2 nanoparticles, controlling the rutile TiO 2 (TiO 2 -R) phase content ( γ R ) from 33.0 % to 99.3 % by adjusting the doping level of RS to 20.0 wt% in the metatitanic acid (MA). The sample, designated as MA-20, with the highest oxygen vacancy (O v ) concentration of 38.56 %, demonstrated over 99 % microwave absorption (minimum reflection loss ( R L ) −56.8 dB) and a heating rate of 0.836 °C/s under 2000 W and 20 g. RS enhanced the dielectric property of MA, facilitating phase transition from anatase TiO 2 (TiO 2 -A) to TiO 2 -R above 600 °C, with critical temperatures between 800 and 1000 °C. MA-20, with a surface area of 1.9226 m 2 /g and pore size distribution of 9.0851 nm, showed that higher RS doping levels promoted phase transition and grain growth, thereby enhancing the crystallinity and charge transfer efficiency. More than 50 % of MA-20 particles were under 10 nm, and 94 % were below 100 nm, confirming the synthesis of TiO 2 nanomaterials. MA-20 exhibited excellent electromagnetic wave storage and conversion properties. Adjusting microwave parameters and RS levels controls γ R , offering an efficient approach for preparing mixed phase TiO 2 catalysts, essential for semiconductor photocatalysis and overcoming TiO 2 -A limitations.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2018
·Vol. 29
·期 6
·981-988
·
IF 1.715
Liu ZhangSheng,Li LinNa
Coal cinder-supported TiO 2 photocatalysts were synthesized via a novel coal combustion method. As-obtained samples were characterized by XRD, SEM, EDS mapping, Raman spectra, FTIR and DRS, and their photocatalytic performances were evaluated by degradation of methylene blue (MB) and methyl orange (MO) under UV–Vis light illumination. The results revealed that mixed-phases TiO 2 with adjustable anatase–rutile ratio could be obtained by adjusting the amount of precursor tetrabutyl titanate, which was uniformly covered on the coal cinder. These coal cinder-supported TiO 2 photocatalysts exhibited commendable photocatalytic activity. Among them, the indexed CCT-7.5 sample presented the maximum of activity, which can be attributed to the optimal phase composition of TiO 2 . The present work provided a novel synthetic route to fabricate immobilized photocatalysts, which might be extended to the preparation of other functional materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 2
·166-177
·
IF 1.158
Cao Zhenhao,Li Wenting,Pang Juanjuan,Xu Jingjing,Jiao Yapei,Li Xue
Polyethyleneimine (PEI) modified PluronicF127 block copolymers (PEI-F127-PEI) were synthesized via a chemical reaction of isocyanate and hydroxyl group. By using PEI-F127-PEI block copolymers as templates combined with a sol–gel process, followed by evaporation-driven assembly
and calcination process, mesoporous TiO2 nanomaterials with different phase composition (rutile, anatase/rutile mixture, and anatase) and morphology were prepared. The prepared TiO2 samples were characterized by transmission electron microscopy (TEM), X-ray diffraction
(XRD), UV–vis diffuse reflectance spectrophotometry and N2 adsorption analysis. It is found that the mass ratio of TiCl4/PEI-F127-PEI and calcination temperature have an important influence on the phase composition and morphology of TiO2. Compared to
reported values, the transformation temperature from anatase to rutile decrease. When the mass ratio of TiCl4/PEI-F127-PEI is 2.0/1, the prepared sample exhibits the highest photocatalytic activity for the degradation of methylene blue (MB) under UV light irradiation, indicating
that the mixed anatase/rutile phase TiO2 is an efficient photodegradation catalyst of MB pollutant in wastewater treatment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Shufang Ren,Runyan Feng,Shounian Cheng,Liqiu Huang,Qingtao Wang,Zhixiang Zheng
In this work, an ultrasensitive electrochemical sensor towards quantitative detection of acetaminophen (AP) based on hybrid of metallic 1 T and semiconductive 2H phase molybdenum disulfide (1 T/2H MoS 2 ) anchored on rGO sensing platform was constructed. The XRD, FESEM, FETEM and XPS analysis indicates that nanoflowers 1 T/2H MoS 2 with walnut-like fold structure were in-situ loaded onto the surface of rGO nanosheets by the hydrothermal approach. The formation of stabilized 1 T MoS 2 is associated with the influence of GO. The electrochemical tests of CV, EIS and DPV show that the hybrid composite MoS 2 /rGO remarkably promoted the detecting performance owing to the increased conductivity of 1 T MoS 2 that can facilitate charge transfer kinetics, the great active sites on both basal and edge of planes of 1 T/2H MoS 2 and the synergic effect of 1 T/2H MoS 2 and rGO. After the test condition optimization, MoS 2 /rGO/GCE sensor has great electrocatalytic activity towards AP with wide linear range of 0.005–300 μM and low limit of detection of 1.7 nM (S/N = 3). Furthermore, the sensor shows excellent stability, repeatability, reproducibility and anti-interference performance. All results proved that the GO-assisted hydrothermal prepared hybrid 1 T/2H MoS 2 /rGO is promising material for electrochemical analysis.
研究领域:
分析化学
·
材料科学
·
药物分析
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shiyue Ren,Yingnan Duan,Zhimin Feng,Haitao Yuan,Lihong Hu,Jiao Wang,Weizun Li,Zhurui Shen
Photocatalytic CO 2 reduction is a promising approach to close the carbon cycle by converting CO 2 into high-value chemicals and fuels, but its practical advancement is hindered by key challenges in photocatalyst design. Though oxygen vacancies (O V ) engineering and noble metal co-catalysts can enhance performance via synergistic strong metal-support interactions (SMSI), their use is limited by harsh synthesis conditions and noble metal cost. Herein, we integrated Pt nanoparticle (Pt NPs )-loaded mixed-phase TiO 2 (anatase/rutile) with abundant O V via a facile two-step method. The as-prepared Pt/A2-TiO 2-x exhibited CH 4 and CO production rates of 72.31 and 55.45 μmol·g⁻¹·h⁻¹ in pure H 2 O, representing 5.6- and 9-fold enhancements over pristine TiO 2 . Characterizations, theoretical calculations, and in-situ Fourier transform infrared spectroscopy confirmed that O V facilitated robust Pt-TiO 2 SMSI, which promoted bulk photogenerated electron migration to Pt surfaces and accelerated CO 2 adsorption/activation, thereby optimizing the CO 2 -to-CH 4 reaction pathway. This work deepens understanding of metal-vacancy synergy and provides a rational strategy for designing cost-effective, high-performance photocatalysts for CO 2 reduction.
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2012
·Vol. 2
·期 7
·1455-1462
·
IF 0
Fa-tang Li,Ying Liu,Zhi-min Sun,Ye Zhao,Rui-hong Liu,Lan-ju Chen,Di-shun Zhao
Mixed-phase Fe2O3 was prepared from Fe(NO3)3 and (C2H5)3NHCl via solution combustion. Photocatalytic oxidative desulfurization of dibenzothiophene (DBT) under simulated sunlight irradiation using mixed-phases of α- and β-Fe2O3 as catalysts was investigated. The DBT in the oil phase was extracted into water phase and then photooxidized to CO2 and SO42− by Fe2O3 and O2 dissolved in water. The Fe2O3 containing 36.6% β-Fe2O3 and 63.4% α-Fe2O3 exhibited the highest photocatalytic activity. Sulfur removal of DBT in n-octane was 92.3% for 90 min irradiation under the conditions of V(water) : V(n-octane) = 1 : 1, air flow rate at 150 mL min−1, and Fe2O3 addition at 0.05 g. The kinetics of photooxidative desulfurization of DBT was a pseudo-first-order with an apparent rate constant of 0.0287 min−1 and half-time of 24.15 min. The sulfur content of the actual diesel could be reduced from 478 μg mL−1 to 44.5 μg mL−1 after 90 min. The radical scavengers experiments and terephthalic acid fluorescence technique indicated that ˙OH and O2˙− were the main reactive species in the DBT photocatalytic degradation. A potential photocatalytic desulfurization mechanism using mixed-phase Fe2O3 was proposed.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
ACTA PHYSICO-CHIMICA SINICA
·
2015
·Vol. 31
·期 3
·519-526
·
IF 0.852
YU Jian-Hua,FAN Min-Guang,LI Bin,DONG Li-Hui,ZHANG Fei-Yue
A series of composites consisting of anatase-rutile TiO2 and graphene (TrG) were synthesized by a hydrothermal route. The influence of the amount of graphene oxide on the photocatalytic activity during the degradation of methyl blue was studied. The photocatalysts were characterized
by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET)
specific surface area measurements. The results show that as-prepared TiO2 formed in the anatase and rutile phase with a bar structure and it dispersed uniformly over the surface of the graphene sheets. The composites possess higher catalytic activity because of the strong absorption
capacity of graphene, the establishment of heterojunctions between rutile and anatase TiO2, the remarkable electrical transport between TiO2 and graphene and the high specific surface areas. The photodegradation performance of methyl blue by the TrG composites under UV
light was studied. Our results indicate that the photocatalytic activities of titanium dioxide-graphene composites were higher than those of pure TiO2. We also found that the TrG composites prepared with a loading of 0.8%(mass fraction, w) graphene oxide had the best photocatalytic
activity.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 27
·2300519
·
IF 13.3
Lizhen Long,Yaya Ding,Nina Liang,Jun Liu,Fuchi Liu,Sheng Huang,Yuezhong Meng
Li–CO 2 battery provides a new strategy to simultaneously solve the problems of energy storage and greenhouse effect. However, the severe polarization of CO 2 reduction and CO 2 evolution reaction impede the practical application. Herein, anodic TiO 2 nanotube arrays are first introduced as carbon-free and free-standing cathode for photo-assisted Li–CO 2 battery, and the photo-assisted charge and discharge mechanism is first clarified from the perspective of photocatalysis. Mixed-phase TiO 2 exhibits a long cycling life of 580 h (52 cycles) at 0.025 mA cm −2 and delivers a high discharge specific capacity of 3001 µAh cm −2 under UV illumination. The charge voltage dramatically reduces from 4.53 to 3.03 V under UV illumination. The improvement of photo-assisted Li–CO 2 battery performance relies on the synergistic effect of the hierarchical porous structure, strong UV absorption, efficient separation, and transfer of photo-generated electrons and holes at hetero-phase junction, and the facilitation of photo-generated electrons and holes on CO 2 reduction and CO 2 evolution reaction. This work can provide useful guidance for designing efficient photocathode for photo-assisted Li–CO 2 battery and other metal–air batteries.
研究领域:
材料科学
·
能源存储与转换
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Nousheen Iqbal,Usman Ghani,Ahmed A. Aboalhassan,Aijaz Ahmed Babar,Qinglei Liu,Di Zhang
Sodium-ion batteries (SIBs) have been deemed promising substitutes for lithium-ion batteries (LIBs), but challenges remain in pursuing high flexibility, high-rate performance, as well as cycling sustainability. In this work, a novel interface-coupled hybrid electrode is designed by combining atomically thin, two-dimensional (2D) transition-metal dichalcogenides (TMD) molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂) nanosheets onto carbon nanofiber (CNF) scaffolding to create a hierarchical mixed phase 2D 1D hybrid structure via precision exfoliation-deposition approaches. MoS₂-CNF (M-CNF) and WS₂-CNF (W-CNF) mixed phase (1 T/2H) hybrid nanocomposites possess controllable nanosheet thickness, defects, as well as strong interfacial interactions. The results from comprehensive characterization analysis include strong interfacial bonds, uniform nanosheet distribution, which promote electron transport routes as well as flexibility. The main findings for M-CNF showed ~673 mAh/g capacity, initial coulombic efficiency (ICE) of ~83 %, whereas W-CNF showed ~461 mAh/g capacity retention; in addition, they showed high-rate discharge capabilities with ~600 consecutive cycles collectively verifying the hypothesis of optimized interfacial interactions for charge transport as well as flexibility benefits. This study forges a new scalable mixed phase electrode platform, contributing to fundamental insights into interface-coupled hybrid in flexible energy storage technologies offering an avenue to more efficient applications for high-performance wearable SIBs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Bingjie Wen,Nizao Kong,Min Huang,Liqin Fu,Dingbang Yan,Yexin Tian,Jinshui Liu,Ruixuan Tan,Fei Han
Despite the outstanding theoretical capacities of two-dimensional (2D) molybdenum sulfide (MoS2) with low costs, its low conductivity and easy agglomeration greatly impede the business application as anode materials. The heterostructures between 2D MoS2 and Ti3C2 MXene are able to combine the collective superiorities of MoS2 and Ti3C2, thus greatly ameliorating the electrical conductivity and rate capacity through synergistic effects. Herein, we design a simple intercalation–sulfidation strategy for the construction of the TH MoS2/Ti3C2 heterostructures with a compact stacking lamellar structure and investigate the electrochemical sodium storage properties of the composite. In the architecture, fallen leaf-like MoS2 nanosheets with a mixed-phase crystal containing 1T and 2H phases grow tightly on the surface and interlayer of Ti3C2 matrixes. The expanded layer spacing of Ti3C2 as a result of MoS2 insertion can greatly accelerate electronic/sodium ion transport. Meanwhile, 2D Ti3C2 can serve as a strong mechanical support for the composite electrode to provide a buffer space for volume expansion and avoid structural collapse during cycles. Benefiting from these structural advantages, the TH MoS2/Ti3C2 anode reveals higher sodium storage capacity of 743.6 mAh g–1 than bare MoS2 (579.4 mAh g–1) at 0.2 A g–1. Furthermore, the anode exhibits significantly improved battery rate performance with a high sodium storage capacity of 653.3, 539.1, 512.1, 488.7, 439.3, and 586.7 mAh g–1 at 0.2, 0.5, 1, 2, 5, and 0.2 A g–1. Our study provides a unique synthesis route to construct layered heterostructure composites by artificial stacking of different types of 2D materials, which are considered as highly promising electrode materials for sodium-ion batteries (SIBs).
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
无机化学
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yuxi Pi,Bo Liu,Zhen Li,Yukun Zhu,Yang Li,Fengbao Zhang,Guoliang Zhang,Wenchao Peng,Xiaobin Fan
A novel three-dimensional (3D) photoanode consisting of TiO 2 nanorod arrays (TiO 2 NAs) coated by exfoliated WS 2 nanosheets was fabricated for enhanced photoelectrochemical water oxidation . Mixed phase WS 2 nanosheets with 1 T percentage of 55% were exfoliated by the lithium insertion, which were then coated on the top of TiO 2 NAs by a drop-casting method. By optimizing the loading amount of WS 2 , a maximum photocurrent of ∼1.8 mA/cm 2 could be obtained at +1.8 V vs. RHE under AM 1.5 irradiation (100 mW/cm 2 ), which is 2.3 times higher compared to the pure TiO 2 NAs (0.8 mA/cm 2 ). The enhanced photo-activity should be attributed to the presence of the mixed phase WS 2 nanosheets, which have excellent charge transport ability and can accept photogenerated holes for water oxidation.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
·
半导体光电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）