CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhi Zhang,Dongqiang Gao,Jiaguang Zheng,Ao Xia,Qingbo Zhang,Li Wang,Liuting Zhang
For solid-state hydrogen storage, Mg(BH 4 ) 2 has long been recognized as a promising material. However, its higher thermal stability is distant from conditions for practical application. Herein, it is effectively established that VF 4 nanoparticles anchored on 2D Mxene Ti 3 C 2 (VF 4 @Ti 3 C 2 ) have efficiently catalytic effects towards the hydrogen storage process of Mg(BH 4 ) 2 . The MBH-VF 4 @Ti 3 C 2 sample started releasing hydrogen at 90 °C, which was 182 °C and 55 °C lower than those of additive-free Mg(BH 4 ) 2 and MBH-20Ti 3 C 2 composites. Additionally, the MBH-20VF 4 @Ti 3 C 2 composite desorbed more than 8 wt% H 2 at 275 °C. The activation energies of dehydrogenation were reduced, and the improved reversibility of VF 4 @Ti 3 C 2 -doped Mg(BH 4 ) 2 was also discussed. According to microstructural study, the heterostructural VF 4 @Ti 3 C 2 interacted with Mg(BH 4 ) 2 to produce VH 2.01 and metallic Ti during re/dehydrogenation, which worked as active species to improve hydrogen storage performance in Mg(BH 4 ) 2 .
研究领域:
材料科学
·
能源存储
·
催化
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Xuelian Yu,Wenchao Yin,Tao Wang,Yihe Zhang
One of the major challenges associated with fuel cells is exploring highly efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR). Herein, the feasibility of using Ti3C2 MXene nanoparticles (NPs) to enhance the electrocatalytic activity of g-C3N4 for ORR was investigated. By varying the content of Ti3C2 NPs, a series of g-C3N4/Ti3C2 heterostructures were obtained, displaying enhanced electrocatalytic activity, including a positive shift in both onset and peak potentials toward ORR, compared to the original g-C3N4 in basic solution. We attribute the improvement to the favorable electrical conductivity of well-dispersed Ti3C2 MXene nanoparticles and also enhanced O2 adsorption due to the electronic coupling effect between g-C3N4 and Ti3C2 in the heterostructures. This work demonstrates the potential of earth-abundant MXene family materials to construct low-cost and high-performance electrocatalysts.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Haizhen Liu,Chenglin Lu,Xinchun Wang,Li Xu,Xiantun Huang,Xinhua Wang,Hua Ning,Zhiqiang Lan,Jin Guo
Two-dimensional vanadium carbide (V2C) and titanium carbide (Ti3C2) MXenes were first synthesized by exfoliating V2AlC or Ti3AlC2 and then introduced jointly into magnesium hydride (MgH2) to tailor the hydrogen desorption/absorption performances of MgH2. The as-prepared MgH2–V2C–Ti3C2 composites show much better hydrogen storage performances than pure MgH2. MgH2 with addition of 10 wt % of 2V2C/Ti3C2 initiates hydrogen desorption at around 180 °C; 5.1 wt % of hydrogen was desorbed within 60 min at 225 °C, while 5.8 wt % was desorbed within 2 min at 300 °C. Under 6 MPa H2, the dehydrided MgH2–2V2C/Ti3C2 can start to recover hydrogen at room temperature, and 5.1 wt % of H2 is obtained within 20 s at a constant temperature of 40 °C. The reversible capacity (6.3 wt %) does not decline for up to 10 cycles, which shows excellent cycling stability. The addition of 2V2C/Ti3C2 can remarkably lower the activation energy for the hydrogen desorption reaction of MgH2 by 37% and slightly reduce the hydrogen desorption reaction enthalpy by 2 kJ mol–1 H2. It was demonstrated that the combination of V2C and Ti3C2 promotes the hydrogen-releasing process of MgH2 compared with addition of only V2C or Ti3C2, while Ti3C2 impacts MgH2 more significantly than V2C in the hydrogen absorption process of MgH2 at ambient temperatures. A possible mechanism in the hydrogen release and uptake of the MgH2–V2C–Ti3C2 system was proposed as follows: hydrogen atoms or molecules may preferentially transfer through the MgH2/V2C/Ti3C2 triple-grain boundaries during the desorption process and through the Mg/Ti3C2 interfaces during the absorption process. Microstructure studies indicated that V2C and Ti3C2 mainly act as efficient catalysts for MgH2. This work provides an insight into the hydrogen storage behaviors and mechanisms of MgH2 boosted by a combination of two MXenes.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Fanfan Liu,Aiguo Zhou,Jinfeng Chen,Jin Jia,Weijia Zhou,Libo Wang,Qianku Hu
Here we reported the preparation of Ti 3 C 2 MXene and Ti 2 C MXene by etching Ti 3 AlC 2 and Ti 2 AlC with various fluoride salts in hydrochloric acid (HCl), including lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF), and ammonium fluoride (NH 4 F). As-prepared Ti 2 C was further delaminated by urea, dimethylsulfoxide or ammonium hydroxide. Based on theoretical calculation and XPS results, the type of positive ions (Li + , Na + , K + , or NH 4 + ) in etchant solution affect the surface structure of prepared MXene, which, in turn, affects the methane adsorption properties of MXene. The highest methane adsorption capacity is 8.5 cm 3 /g for Ti 3 C 2 and 11.6 cm 3 /g for Ti 2 C. MXenes made from LiF and NH 4 F can absorb methane under high pressure and can keep methane under normal pressure, these MXenes may have important application on capturing methane or other hazardous gas molecules. MXenes made from NaF and KF can absorb methane under high pressure and release methane under low pressure. They can have important application in the adsorb storage of nature gas.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing He,Peiwen Wu,Linlin Chen,Hongping Li,Mingqing Hua,Linjie Lu,Yongqing Wei,Yanhong Chao,ShuaiShuai Zhou,Wenshuai Zhu,Huaming Li
Ti 3 C 2 MXene with dynamically-generated TiO 2 active site for boosting catalytic oxidative desulfurization has been researched. The two-dimensional Ti 3 C 2 MXene, with abundant interface engineering and loosely layered structure, was synthesized through selectively etching of aluminum (Al) layer in Ti 3 AlC 2 MAX. The desulfurization activity of Ti 3 C 2 MXene is higher than that of bulk Ti 3 AlC 2 MAX. Compared with Ti 3 AlC 2 MAX, the expanded slit layer provides more pores and cavities to accelerate the mass transfer of the reaction. Also, the excellent dispersion and interfacial affinity are conducive to the further access of MXene with the substrate in diesel. More than 87% of sulfides in real diesel can be removed with Ti 3 C 2 MXene as the catalyst. Specifically, the dynamically-generated active sites originate from the continuous activation of molecular oxygen and Ti 3 C 2 MXene, which favors the enhance of catalytic activity. Meanwhile, by detecting and analyzing the oxidizing products of various aromatic sulfides, the results show that the MXene interlayers serve as a reaction micro-cavity and are beneficial to the adsorption and removal of the sulfone. This work not only illustrates that MXene can be used in thermally excited catalytic systems, but also provides an example around the construction of dynamically generated active sites to extend the life of the catalyst.
研究领域:
材料科学
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催化化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5319-5333
·
IF 4.5
Wang Yun,Tan Hongjie,Sang Lexian,Xie Yunying,Jia Fuchao,Zhou Tong,Yin Guangchao,Sun Fazhe,Wang Xiaomei
An optimized acetone gas sensor based on Ti 3 C 2 / α -Fe 2 O 3 (TF) composite materials was synthesized using microwave and etching methods. The structures, morphology and composition of the TF composites were characterized via XRD, XPS, SEM and TEM. The crystal of α -Fe 2 O 3 porous nanorods is hexagonal, and the α -Fe 2 O 3 nanoclusters formed from α -Fe 2 O 3 nanorods were adhered adequately on the lamellar Ti 3 C 2 MXene in the TF composite. The specific surface area and surface defects of the TF composites increased compared with pure α -Fe 2 O 3 nanocluster material, thus exposing a large number of gas adsorption sites. Furthermore, the excellent electrical conductivity and high free charges transfer ability of Ti 3 C 2 MXene provided more electrons for the gas-sensitive reaction and enhanced the transmission capacity of gas-sensitive reaction electrical signal, respectively. The Schottky barriers were formed at the interface of α -Fe 2 O 3 and Ti 3 C 2 MXene increasing the resistance of TF gas sensor in air, which is beneficial to the response of TF gas sensor. So, the gas-sensitive performance of TF gas sensor to acetone was greatly improved. The response of TF gas sensor to 100 ppm acetone was up to 23.38, which was nearly 2.3 times higher than pure α -Fe 2 O 3 gas sensor. The lower detection limit of TF gas sensor could be as low as 1 ppm. In addition, the TF gas sensor had excellent selectivity, long-term repeatability and stability for acetone.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Hao Liu,Pan He,Jiaxin Cao,Tao Duan,Qingquan Kong,Weitang Yao
The nature of vanadium oxides with multiple valence states and a rich species of oxides facilitates the construction of high performance batteries. Among these, vanadium dioxide (VO 2 ), despite offering several advantages, is seldom reported in anode materials due to its inferior cycling stability and rate performance caused by large volume changes. Herein, we employed a rational structural strategy to assemble VO 2 -NTs/Ti 3 C 2 anode with a multidimensional cross-linked structure using VO 2 nanotubes (VO 2 -NTs) and Ti 3 C 2 T x MXene . Specifically, the abundant multidimensional channels of VO 2 -NTs/Ti 3 C 2 reduce the diffusion impedance of the ions, and the enhanced intrinsic conductivity and highly robust structure solve the problems originally present in VO 2 , which are verified in characterization and density functional theory calculations. Consequently, the composite electrode shows ultra-high reversible capacity (1425 mAh g −1 at 1 A g −1 ), excellent cycling performance (516 mAh g −1 at 5 A g −1 after 2000 cycles) and superior rate performance (703 mAh g −1 at 10 A g −1 ), and also exhibits decent sodium storage performance, representing the best comprehensive battery performance of VO 2 -based anodes to date.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Hongjun Fang,Yusong Pan,Minyun Yin,Linfeng Xu,Yuan Zhu,Chengling Pan
Ternary Ti 3 C 2 –OH/ln 2 S 3 /CdS composites with an efficient visible-light-driven photocatalytic performance have been prepared via a facile hydrothermal synthesis method. The photo-degradation experiments verified that Ti 3 C 2 –OH/ln 2 S 3 /CdS composite with a large surface area of 68.2 m 2 /g exhibited an enhanced photocatalytic activity and adsorption capacity towards Rhodamine B under visible light irradiation , which was higher than that of the naked CdS and ln 2 S 3 , respectively. Furthermore, Ti 3 C 2 –OH/ln 2 S 3 /CdS composite showed robust degradation efficiency for mixture dyes of RhB and Methyl Orange (MO), and its catalytic ability was superior to that of ternary GO/ln 2 S 3 /CdS composite. The trapping experiments for active species revealed that hole (h + ) and • O 2 − species played a critical role in the removal of organic pollutants. In summary, the enhanced photocatalytic performance of Ti 3 C 2 –OH/ln 2 S 3 /CdS photocatalyst was derived from an excellent charge carrier separation and transfer of Ti 3 C 2 –OH MXene and the synergistic effect between CdS and ln 2 S 3 which resulting in strong visible light response.
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
Environmental Science-Nano
·
2022
·Vol. 9
·期 7
·2417-2426
·
IF 9.473
Zhenting Yuan,Wenrou Tian,Tingting Ren,Jun Han,Najun Li,Dongyun Chen,Jianmei Lu
Highly conductive Sn2+-anchored Ti3C2 quantum dots (Sn-TQDs) prepared by electrostatic attraction between Sn2+ and Ti3C2 quantum dots (TQDs) have a vital ability to transfer electrons. Herein, WO3/Sn-TQDs/In2S3 heterojunctions have been fabricated for the first time by introducing Sn-TQDs as electron mediators to shuttle electrons from WO3 to In2S3 efficiently, further realizing the rapid reduction of low-concentration Cr(VI) and H2 generation by water splitting under visible light. The Cr(VI) reduction efficiency and H2 evolution rate over WO3/Sn-TQDs/In2S3 were 2.1 and 5.5 times that of WO3/TQDs/In2S3, respectively. The enhanced photocatalytic activity of WO3/Sn-TQDs/In2S3 can be attributed to the positively charged Sn2+ anchored around the negatively charged TQDs, facilitating the improvement of photogenerated electron transfer efficiency. Finally, the possible photocatalytic mechanism of Cr(VI) reduction and H2 generation by WO3/Sn-TQDs/In2S3 was proposed. This provides a new perspective on the surface modification of Ti3C2 quantum dots in photocatalysis.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Dancheng Zhu,Yonghui Lin,Changhui Chen,Hao Xu,Jiabin Shen,Jun Qiao,Chao Shen
This paper reports the recovery and reuse of Pd ions from pharmaceutical wastewater using amino-modified Ti 3 C 2 . Ti 3 C 2 –NH 2 was synthesized by modifying (3-aminopropyl)triethoxysilane and the successful substitution of some surface functional groups of Ti 3 C 2 ; the decrease in material thickness was verified by characterization. This study revealed that the presence of amino groups significantly enhanced the Pd(II) adsorption capacity of Ti 3 C 2 . The effects of the adsorbent material, adsorbent dosage, pH, initial concentration of Pd ions, presence of competing cations, and contact time on the adsorption performance were investigated. The maximum adsorption capacity of 20 mg of Ti 3 C 2 –NH 2 was 986.65 mg/g in 100 ml of a Pd-ion solution with an initial concentration of 200 mg/l at pH 3. A pseudo-second-order kinetic model fitted well with the experimentally obtained rate data, indicating that the main mode of Pd-ion removal by Ti 3 C 2 –NH 2 was via chemical reduction. Finally, the catalyst exhibited excellent performances during the photocatalytic and Suzuki coupling reactions with yields of 81 % and 95 %, respectively. The results demonstrated that Ti 3 C 2 –NH 2 is an excellent material for adsorbing Pd ions and can effectively recycle these ions from pharmaceutical wastewater.
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
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9817-9829
·
IF 10.7
Liwei Hou,Xinyue Xu,Xiaoli Wang,Li Wang,Fengchun Tian,Yi Xu
In this paper, we propose a composite nano-microstructure comprising Ti3C2 and nanogold as a surface-enhanced Raman spectroscopy (SERS)-active substrate for the highly sensitive sensing of amine gases. The adsorption performance of Ti3C2 was tested by a quartz crystal microbalance (QCM) sensor. Excellent adsorption ability of Ti3C2 was observed for aniline, phenylenediamine, and diethylamine, with adsorption amounts exceeding 2210, 1740, and 970 ng cm−2, respectively. The synergistic effect of the electromagnetic properties of Ti3C2 and nano-Au in the Ti3C2/nano-Au composite nanostructures was verified by finite-difference time-domain simulation. Partial chemical enhancement between Ti3C2 and aniline was verified by photocurrent tests. To achieve assay specificity, mercaptoacetaldehyde (MA) was adopted as a recognition probe. The Schiff base reaction between aldehyde groups and amino groups produces the –CN– bond, with the Raman characteristic peak at 1635 cm−1, enabling precise amine identification with the SERS chip. To obtain the Ti3C2/nano-Au@MA SERS sensing chip, nano Au was deposited on an indium tin oxide substrate using the chronoamperometric method, followed by nano-Au aldolization modification through Au-SH interactions and the spin-coating of a Ti3C2 film layer. Due to the high affinity of Ti3C2 for amine molecules and the low SERS background signal of MA and Ti3C2, the SERS spectra could be used for ultra-sensitive detection of amines. Three amine gases, i.e. aniline, p-phenylenediamine, and diethylamine, were detected quantitatively using the intensity ratiometric method on the functionalized Ti3C2/nano-Au@MA SERS sensor chip. The detection limits were 1, 1, and 20 parts per billion, respectively. By identifying the characteristic fingerprint peaks and comparing the relative intensity of the –CN– characteristic peak, quantitative analysis of the components of aniline and p-phenylenediamine mixed gas was accomplished. These findings demonstrate that the Ti3C2/nano-Au@MA SERS sensor chip offers a promising approach for the detection of amine gas molecules and holds potential for applications in environmental monitoring, disease diagnosis, and chemical analysis.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
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
·
能源与环境科学
✓ 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）