Inorganics
·
2024
·Vol. 12
·期 8
·229
·
IF 3.1
Zhouqian Chen,Zongmei Li,Manyi Zhang,Yujia Wang,Siang Zhang,Yuanyuan Cheng
FeCo2O4/MoS2binary composite catalysts were prepared by the hydrothermal method and calcination method. In this paper, the morphology and structure of the materials were characterized by means of SEM, EDS, XRD, and XPS. It was found that MoS2has high activity and good stability in HER, and and it has more prospect than noble metal catalysts. In oxygen evolution chemical kinetics, its rich redox potential allowed it to adsorb OH−on (Co2+/Co3+, Fe2+/Fe3+) and enhanced the activity of OER. The cross-nanosheet structure of the FeCo2O4/MoS2composite catalyst exposed more catalytic sites and accelerated charge transfer to achieve more efficient mass transfer. FeCo2O4/MoS2as an anode and cathode was assembled into a two-electrode system in overall water splitting, which showed good catalytic activity. When the composite ratio of FeCo2O4to MoS2was 1:0.3, the composite catalyst had the best catalytic activity. The results show that when FeCo2O4/MoS2is used as a cathode and anode to assemble an alkaline cell, respectively, the voltage for total water electrolysis is 1.59 V at a current density of 10 mA cm−2in a 1 M KOH electrolyte, it can keep good stability in a 10 h test with electrolyzed water, and its current retention rate is 98.5%.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ning Zhang,Zhuhe Zhai,Yueru Yan,Xuejiao Feng,Shengqiang Chen,Yafei Zhao,Bing Zhang
Rationally designing heterostructured photocatalysts to expedite the separation/transfer of photoinduced electrons/holes is regarded as an exceptionally efficient and simple strategy for promoting the photocatalytic hydrogen production from water splitting. To this end, an effective photocatalyst (Co-MoS 2 /ZIS) was constructed via in-situ growth of two-dimensional (2D) ZnIn 2 S 4 (ZIS) nanosheets on 2D Co doped MoS 2 (Co-MoS 2 ) nanoplates to obtain 2D/2D heterostructure. The optimized 5 wt% 20-Co-MoS 2 /ZIS photocatalyst displays a remarkably higher photocatalytic water splitting performance with hydrogen generation rate of 2405.34 μmol g -1 h −1 than that of pure ZIS (419.69 μmol g -1 h −1 ). Additionally, it also demonstrates good stability and reusability with unconspicuous and insignificant decrease of activity after eight cycles and 24 h. The improved photocatalytic hydrogen production performance may be attributed to the extraordinary heterostructure of Co-MoS 2 /ZIS, the doping of Co in MoS 2 and the thick/flat surface of Co-MoS 2 , which provide large close contact interface and plentiful active sites, and prevent the aggregation of ZIS and Co-MoS 2 , thus shortening the transport distance, improving the light absorption and accelerating the separation/transfer of the photoinduced electrons/holes. This work offers a rational and feasible method for coupling 2D ZIS nanosheets with other 2D nanoplates for enhanced photocatalytic hydrogen generation from water splitting.
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
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yong Yang,Shenman Yao,Wufei Gong,Yan Liang,Ting Yu,Cailei Yuan
Light excitation has been developed as an economical way to realize room-temperature gas sensing recently. However, the high recombination rate of photogenerated carriers in semiconductor gas sensing materials leads to very limited carriers that can effectively take part in sensing reactions, which greatly restricts the further performance improvement of gas sensing under light excitation. Here, a hierarchical Z-scheme heterostructure microsphere of MoS2/SnO2 is designed and prepared. The heterostructure demonstrates an outstanding NO2 sensing performance at room temperature with the excitation of a low-power LED light (0.06 W), which exhibits an ultrahigh sensitivity of 264.2 to 10 ppm of NO2 along with acceptable response/recovery properties. The physical mechanism of NO2 sensing is analyzed. The results suggest that the construction of the Z-scheme heterostructure between MoS2 and SnO2 can greatly promote the separation of photogenerated carriers so that more photogenerated carriers can take part in the NO2 sensing reaction. Furthermore, the designing of a hierarchically porous structure can provide abundant active sites for gas sensing reactions. The work not only expands the development of Z-scheme heterostructures in gas sensing but also provides a strategy to promote the performance of light-excited gas sensors by designing a Z-scheme heterostructure with a hierarchically porous structure.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Jialin Ma,Hengdong Ren,Zhenying Liu,Jun Zhou,Yueqin Wang,Biao Hu,Yin Liu,Ling Bing Kong,Tianshu Zhang
A microwave absorber of MoS 2 -PANI with three-dimensional spherical structure was synthesized. The absorber was prepared by one-step hydrothermal strategy of a two-dimensional nanoflower-like MoS 2 and in-situ oxidation polymerization reaction with an aniline monomer under ice bath conditions. It can be clearly seen from the SEM characterization that the structure of this three-dimensional MoS 2 -PANI microwave absorber is composed of a soft flower-like MoS 2 as a carrier and a successful intercalation of two-dimensional nano-rod PANI . The effects of aniline monomer, initiator and molybdenum disulfide on the microwave absorption properties of MoS 2 -PANI nanocomposites were investigated by adjusting different mass ratios. The results show that the optimized reflection loss (RL) of the MoS 2 -PANI nanocomposites after interlayer is −59.78 dB, a matching thickness of 3.44 mm and an effective absorption frequency range of 6.56–9.68 GHz (RL < -10 dB), covering C-Band and X-band. The outstanding microwave absorption performance of the MoS 2 -PANI nanocomposites is attributed to three factors, including enlarged specific surface area, reduced particle size and increased electrical conductivity .
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Shaoqing Wang,Xiangqing Wu,Faqin Xie,Jiayu He,Hao Yu
The innovative work presented in the paper focused on microstructures and wear performance of MoS 2 doped Al 2 O 3 coatings on TC6 alloy. Nano- and micron-sized MoS 2 particles doped Al 2 O 3 coatings (n and m-MoS 2 /Al 2 O 3 coating) were fabricated on TC6 alloy via cathodic plasma electrolytic deposition (CPED) technique. The microstructures and compositions of the coatings were characterized, the tribological behaviors were tested, and doping mechanism of MoS 2 particles was discussed. The results showed that, doped coatings were composed of α -Al 2 O 3 , γ -Al 2 O 3 and MoS 2 . The doping of MoS 2 particles promoted the transformation from γ -Al 2 O 3 to α -Al 2 O 3 during CPED process , and increased the compactness and crystallinity of doped coatings. The friction coefficients of TC6 alloy, Al 2 O 3 coating, n-MoS 2 /Al 2 O 3 coating and m-MoS 2 /Al 2 O 3 coating were about 0.7, 0.6, 0.55 and 0.45 in sequence, and the wear rates of n-MoS 2 /Al 2 O 3 coating and m-MoS 2 /Al 2 O 3 coating were about 75 % and 58 % of Al 2 O 3 coating. MoS 2 particles played the role of lubrication and contributed to improving wear performance of doped coatings, both friction coefficients and wear rates were declined, and micron-sized MoS 2 particles presented better wear performance than nano-sized particles.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Zhouyu Tong,Zijian Liao,Yanyan Liu,Mingliang Ma,Yuxin Bi,Weibo Huang,Yong Ma,Mingtao Qiao,Guanglei Wu
Designing one-dimensional (1D) magnetic-carbon composites microwave absorbers is a promising strategy that can meet the current demand for high-performance microwave absorption (MA) materials. In this work, hierarchical structured Fe 3 O 4 /Fe@C@MoS 2 nanofibers were successfully obtained via a simple three-step method. 1D Fe 3 O 4 /Fe@C nanofibers were fabricated through electrospinning technology and in-situ polymerization followed by carbonization and reduction in H 2 /N 2 atmosphere. MoS 2 nanosheets grew irregularly on the surface of 1D Fe 3 O 4 /Fe@C nanofibers to form the flower-like structure. The morphology, composition and magnetism of samples were systematically investigated. Furthermore, electromagnetic characteristics and MA properties of Fe 3 O 4 /Fe@C nanofibers and Fe 3 O 4 /Fe@C@MoS 2 nanofibers were compared. The minimum reflection loss (RL min ) of Fe 3 O 4 /Fe@C@MoS 2 nanofibers could reach −53.79 dB at 11.12 GHz and the corresponding absorption bandwidth (RL < -10 dB) of 4.4 GHz was achieved at the absorber thickness of 2.24 mm. This work combines electrospinning technology with traditional chemical synthesis to prepare a novel 1D core-shell microwave absorber, which provides some inspiration for preparing MA material in the future.
研究领域:
材料科学
·
电磁学
·
化学合成
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shuangyue Hou,Yue Lian,Zongying Xu,Dawei Wang,Chaolei Ban,Jing Zhao,Huaihao Zhang
the ball-flower like composite (NiS 2 @MoS 2 ) was successfully synthesized by a convenient two-step hydrothermal method using Ni(NO 3 ) 2 ·6H 2 O and (NH 4 ) 6 Mo 7 O 24 ·4H 2 O as precursors. MoS 2 nano-sheets, uniformly generated on NiS 2 surface, increases the surface roughness and porosity, and accelerates the electrons and ions transfer of the composite. The synergistic effect of Mo and Ni improves the conductivity of the materials. Furthermore, by controlling the atomic ratio of Mo to Ni in precursors, the composite MN-1 (the molar ratio of MoS 2 to NiS 2 is 1:1) with the best capacity performance was obtained. The morphology and composition were characterized by a variety of means, such as TEM, SEM, XPS, XRD, BET and EDX. The electrochemical measurement results exhibited high specific capacity (848.2 C g −1 at specific current of 1 A g −1 ) and good cycling stability (83.1% specific capacity retention after 10000 GCD cycles) of MN-1 in 6 M KOH. Furthermore, an asymmetric supercapacitor was assembled with MN-1 as positive electrode and activated carbon as negative electrode. When the power density is 0.8 kW kg −1 , its energy density reaches up to 37.2 Wh kg −1 . The present work may offer new design strategy for electrode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Wei Xu,Tao Wang,Ye Yu,Sheng Wang
Core-shell composites of TiO 2 nanospheres equipped with MoS 2 nanosheets (TiO 2 @MoS 2 ) were synthesized in the presence of cetyltrimethylammonium bromide through a facile hydrothermal method , which was followed by annealing process in an atmosphere of 2% H 2 balanced by Ar. The TiO 2 @MoS 2 composites exhibited higher electrochemical performance than pure MoS 2 nanosheets, and showed a reversible capacity of 467 mAh g −1 at 100 mA g −1 after 80 cycles with highly stable capacity retention. This good performance may be attributed to the dispersed MoS 2 layer, which accelerates the surface electrochemical reactions and offers a stable structure, and the TiO 2 sphere, which serves as a stabilizer to retain the MoS 2 structure upon prolonged cycling. The core-shell composites can be a promising candidate for use in lithium-ion batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 22
·8250-8259
·
IF 0
Tianxing Wu,Miaomiao Han
Electrocatalytic selective hydrogenation of α,β-unsaturated aldehydes with water as the hydrogen donor is of great significance to produce fine chemicals. Here, we propose a facile vapor-phase hydrothermal (VPH) method to directly grow defective MoS2 nanoparticles on commercial carbon fiber cloth (MoS2/CFC) for electrocatalytic selective hydrogenation of cinnamaldehyde (CAL). The as-prepared MoS2/CFC exhibited the highest CAL conversion of 88.8% with a maximum TOF value of 12.8 mmol mmolMoS2−1 h−1 at −0.7 V vs. RHE. The high selectivity of CAL hydrogenation could be realized by adjusting the applied potentials, CO hydrogenation product cinnamyl alcohol (COL) was easier to form under lower applied potentials, whereas CC hydrogenation product hydrocinnamaldehyde (HCAL) was easier to achieve under higher applied potentials. Density functional theory (DFT) calculation findings demonstrated that the Mo vacancies in the defective MoS2/CFC facilitated the adsorption of hydrogen atoms, which benefited the generation of Hads and the proceeding of electrocatalytic hydrogenation. Additionally, the existence of Mo vacancies made the CO group more active than the CC group, and reduced the reaction energy of CAL hydrogenation toward COL. Combined with the experimental results and calculation data, we speculate that the real catalytic active center of the defective MoS2/CFC is the defective configuration of Mo vacancies. Furthermore, the high conversion and selectivity of furfural and benzaldehyde hydrogenation confirmed the universality of the defective MoS2/CFC catalyst in electrocatalytic hydrogenation reduction of unsaturated and saturated aldehydes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Changduo Sun,Min Yu,Yuting Li,Bihui Niu,Fenghui Qin,Na Yan,Yinyin Xu,Yian Zheng
Calotropis gigantea fiber (CGF) is a natural cellulose fiber with thin-walled large lumen. Benefitted from its unique structure, CGF was utilized here as a bio-template for the fabrication of hollow carbon microtubes using a facile hydrothermal method , and simultaneously, nano-sized MoS 2 flowers were in-situ generated along the inner and outside surfaces of carbonized fiber microtubes, forming MoS 2 nanoflowers decorated biochar MoS 2 /CGB. Coupled with dual active centers from non-metallic biochar and metallic MoS 2 , MoS 2 /CGB was then used for activating peroxymonosulfate (PMS) to degrade perfluorooctanoic acid (PFOA), one emerging pollutant that had received wide attention in recent years. The experimental results indicated that at room temperature and pH 3.0, MoS 2 /CGB exhibited the degradation efficiency of 79.6% for PFOA, and removal percentage of 50.7% for total organic carbon . During the degradation process, the free radical (SO 4 •− /•OH) and non-radical ( 1 O 2 ) routes coexisted, and the amount of SO 4 •− was about 9 times that of •OH. Combined with mass spectrometry , the possible degradation pathway of PFOA was proposed as transforming into short chained C2- to C5-containing carboxylic acids. With Vibrio fischeri as an indicator, the acute toxicity of PFOA solution and intermediates was evaluated, with the inhibition rate decreased from 27.6% to 4.5%. Finally, MoS 2 /CGB had the ability not only for removing perfluorinated compounds with different carbon chain lengths, but also for catalytically degrading PFOA in tap water and Yellow River water . This work provides plant fiber-based sustainable catalyst for potential application in PMS-based system for boosting PFOA degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yingnan Quan,Jia Li,Mingyue Hu,Maobin Wei,Jinghai Yang,Ming Gao,Yang Liu
A highly sensitive strategy is urgently needed to detect potential cancer biomarkers present at trace levels in the early stages of the disease. Here we report a surface-enhanced Raman spectroscopy (SERS) biosensor that combines enrichment capabilities, MoS 2 @ZnO@Ag, for the ultrasensitive detection of free bilirubin in serum, and was likely to be used for accurate diagnosis of related diseases. The substrate is evolved from the reported MoS 2 @ZnO with Ag nanoparticles attached to it, which integrates the advantages of low cost, simple pretreatment and high sensitivity, and can accurately and quantitatively analyze actual bilirubin samples. The sensing efficiency is evaluated by bilirubin with the detection limit of 10 -8 M. Main emphasis focuses on using MoS 2 @ZnO@Ag SERS substrate to detect the free bilirubin in serum. This substrate exhibits ultrahigh sensitivity in sensing bilirubin in human blood. In this study, the MoS 2 @ZnO@Ag provides a new biosensing technology for the detection of free bilirubin, which is expected to be applied to clinical diagnosis.
研究领域:
生物医学工程
·
分析化学
·
临床诊断
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Yuxin Bi,Zhouyu Tong,Kwok L. Chung,Zijian Li,Yong Ma,Binglong Gao,Zhengkai Cao,Ranran Sun,Xiang Zhong
Advanced microwave absorption (MA) materials have attracted widespread attention to meet the challenges of electromagnetic (EM) pollution. Herein, MgFe 2 O 4 /MgO/C fibers were successfully prepared via electrospinning technology and carbonization , and their surfaces were coated by MoS 2 via hydrothermal method . The EM wave absorption performance of composites was enhanced due to the introduction of MoS 2 . The results showed that the EM wave absorption performance of MgFe 2 O 4 /MgO/C could not meet the requirements due to low dielectric loss and poor impedance matching. The performance of the composites was improved after coating of MoS 2 , which showed the strong wave absorption capability and the broad absorption bandwidth. The optimal reflection loss (RL) is −56.94 dB at 9.5 GHz and the effective absorption bandwidth is 3.9 GHz (8.08–11.98 GHz) with a thickness of 2.7 mm. The excellent MA performance can be mainly attributed to excellent synergistic effect between MgFe 2 O 4 /MgO/C and MoS 2 . Furthermore, MoS 2 also contributes to dielectric loss and ideal impedance matching. MgFe 2 O 4 /MgO/C@MoS 2 composites may be utilized for lightweight and high-efficient MA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）