NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 32
·14655-14664
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IF 3.591
Jing Yan,Xiaomin Song,Bo Jin,Rufang Peng
Nitro explosive photocatalytic degradation is of great importance. Herein, novel and efficient polyethylenimine-g-C3N4/BiOCl (PEI-CN/BC) heterojunctions were constructed through electrostatic self-assembly. Zeta potential results showed that the PEI-CN surface was positively charged. Transmission electron microscopy findings proved that PEI-CN and BC successfully formed a close contact PEI-CN/BC heterostructure. The photocatalytic effect of PEI-CN/BC on PNP degradation was also investigated under simulated light conditions. The results showed that the obtained 1PEI-CN/2BC (mass ratio of PEI-CN to BC was 1 : 2) had the best photocatalytic effect and could completely degrade PNP in 90 min. The apparent rate constant (k) of the reaction was 21.9 and 4.0 times that of PEI-CN and BC alone, respectively. Photoelectrochemistry and photoluminescence results showed that the improved electron–hole separation was the main reason for the superior photocatalytic performance of PEI-CN/BC. Free radical trapping experiments and electron paramagnetic resonance measurements revealed that superoxide radicals were the major active substance in the photodegradation. This work provides inspiration and alternatives in designing new efficient 2D/2D heterogeneous photocatalysts for the efficient degradation of nitro explosive wastewater.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Xiaomin Huo,Honglie Shen,Wei Song,Luanhong Sun,Jaffer Saddique,Jiale Yang
A highly sensitive and selective electrochemical sensor based on porous Cu 2 ZnSnS 4 (CZTS) nanosheets is required for detecting ammonia-ammonium ions (NH 3 –NH 4 + ). Porous CZTS nanosheets synthesized by microwave irradiation method were characterized by Raman, XRD , SEM, TEM , BET, DLS and NH 3 -TPD. The porous nanosheets of CZTS-30 irradiated for 30 min with a surface area of 51.3 m 2 g −1 are significant material and possess many important active sites for NH 3 –NH 4 + oxidation . The electrode was made of a glassy carbon electrode (GCE) modified by CZTS-30. It was revealed by electrochemical measurements that there were two linear ranges for NH 3 –NH 4 + . One was the high concentration ranging from 1.0 mM to 600.0 mM ( R 2 = 0.9989) with a sensitivity of 8.29 μA mM −1 cm −2 , and the other was the low concentration between 0.1 mM and 1.0 mM ( R 2 = 0.9990) with a high sensitivity of 96.14 μA mM −1 cm −2 . It showed a detection limit of 30 μM (S/N = 10) for the sensor in NH 3 –NH 4 + solution mixed with 0.5 mM H 2 SO 4 at a fixed scan rate of 20 mV s −1 . This sensor also demonstrated desirable stability, reversibility and selectivity to NH 3 –NH 4 + . The CZTS/GCE is believed to become a new candidate structure for the electrochemical detection of NH 3 –NH 4 + .
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
·
IF 8.067
Jun Guo,Yu-Ke Zhu,Lin Chen,Zi-Yuan Wang,Zhen-Hua Ge,Jing Feng
Bi 2 S 3 -based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal conductivity . However, low electrical conductivity usually leads to poor electrical transport properties, which seriously restricts their further application in thermoelectric refrigeration and/or power generation. In this work, Bi 2 S 3 with high electrical transport properties is synthesized hydrothermally via Se and Cl co-doping. The maximum electrical conductivity value of 483 S cm −1 was obtained for the Bi 2 S 2.4 Se 0.4 Cl 0.20 sample at room temperature. The significant improvement of electrical conductivity gives rise to a high average power factor of 411 μW m −1 K −2 during the measuring temperature range and a peak value of 456 μW m −1 K −2 at 673 K. Benefiting from the largely improved electrical transport properties, a superior ZT value of approximately 0.66 and ZT ave . of 0.36 were obtained for Bi 2 S 2.4 Se 0.4 Cl 0.20 , and the theoretically calculated conversion efficiency reached 5.7%. The results indicate that Bi 2 S 3 is a promising candidate for thermoelectric applications at medium temperatures.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Tiantian Dai,Ziying Yuan,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
Z–scheme heterojunction has the advantages of high carrier separation efficiency and strong oxidation ability, which is a potential material for photodegradation . In this paper, CdS@Zn,Cr-layered double hydroxides (CdS@LDHs) Z–scheme heterojunction was synthesized and used for photocatalytic degradation of tetracycline (TC). The effects of the amount of catalyst, pH value of the solution, initial concentration of TC, light intensity , and reaction temperature were studied. The degradation kinetics and mechanism were also discussed in detail. Under the optimal conditions (initial concentration of TC 50 mg/L, pH 9, light intensity 500 W, the amount of the catalyst 25 mg, and reaction temperature 45 °C), the highest removal percentage and the corresponding activity of CdS@LDHs was 93.04% and 37.09 mg g −1 h −1 , respectively. In addition, DFT calculation confirmed the existence of built–in electric field (BIEF) in the heterojunction, which promotes the electron transfer from CdS to LDHs. The amount of electron transfer was accelerated, and the recombination of electron and hole was obviously inhibited, so that they were more involved in oxidation and reduction. Thus, it makes CdS@LDHs heterojunction as a highly efficient catalyst for photodegradation of TC.
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APPLIED CLAY SCIENCE
·
2021
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IF 5.467
Sheng Wang,Yan Wang,Yin Liu,Tianshu Zhang,Ling Bing Kong
It is an effective strategy to use clay minerals (palygorskite) to prevent the aggregation of molybdenum disulfide (MoS 2 ) nanosheets prepared with hydrothermal process. The palygorskite/molybdenum disulfide (Pal/MoS 2 ) nanocomposites presented notable microwave absorption performances, which can be optimized by adjusting the content of Pal. The sample with optimized composition has a minimum reflection loss (RL) of -59.91 dB at 9.92 GHz at a thin thickness of 2.28 mm, owing to the enhanced interface polarization and improved impedance matching . It is believed that the 2D hierarchically structured Pal/MoS 2 nanocomposites can serve as a potential microwave absorber for practical applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Yanyan Chen,Minghui Yu,Xiaoyu Gong,Yingjie Wang,Shenjie Li,Qi Hu,Shuang Wang,Hao Yu,Zhiqiang Li
Two kinds of Ag 2 S-Zn 0.5 Cd 0.5 S heterostructural photocatalysts were synthesized via a simple two-step hydrothermal method. The photochemical (PEC) properties of Zn 0.5 Cd 0.5 S nanoparticles modified by Ag 2 S are closely related to the reaction time of Zn 0.5 Cd 0.5 S nanoparticles. Compared with the Ag 2 S-Zn 0.5 Cd 0.5 S heterostructure prepared at low temperature, the Ag 2 S-Ag-Zn-Cd-S composite prepared at high temperature has higher charge transfer/separation efficiency and longer carrier life. The photocatalytic performance of Ag 2 S-Ag-Zn-Cd-S composites for the degradation of Rhodamine B (RhB) under visible light irradiation (λ = 420 nm) was significantly improved. The AZCS-180-4 h photocatalyst exhibited the highest degradation efficiency (83.1% within 40 min) with a rate constant of 0.0401 min −1 which exhibited prominent stability and repeatability, and can still maintain high photocatalytic activity after at least four cycles. Meanwhile, the study of photocatalytic mechanism shows that the photo-induced h + radical is the predominant active species in this photocatalytic system, followed by·OH and·O 2- play a secondary role.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Meng Li,Jingxue Sun,Gang Chen,Shunyu Yao,Bowen Cong
When internally polarized by mechanical energy, piezoelectric materials can establish polarization electric field and provide driving force for separating photogenerated carriers. Herein, S vacancies are introduced as an intermediate to make metal ions form coordination bond with F - on PVDF (polyvinylidene fluoride) surface, and the built-in electric field is intimately related to polarized electric field. We successfully synthesized ZnS/Bi 2 S 3 -PVDF film photocatalyst containing S vacancies (ZnS-V S /Bi 2 S 3 -PVDF). Polarized electric field on PVDF caused by ultrasonic cavitation and built-in electric field formed between ZnS-V S /Bi 2 S 3 heterojunction structure are beneficial to interfacial charge transferring. Theoretical calculation simulation demonstrate that the synergistic effect of the double electric fields is propitious to inhibit the recombination of carriers. The hydrogen evolution rate of ZnS-V S /Bi 2 S 3 -PVDF reaches 10.07 mmol h −1 g −1 . Moreover, it has excellent reversibility and facile recovery capacity. This work provides new platform for photocatalytic reduction of hydrogen evolution and is expected to contribute to clean energy production.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yuan-Ming Cao,Mi Zheng,Yi-Fei Li,Wang-Yi Zhai,Guo-Tao Yuan,Min Zheng,Ming-Peng Zhuo,Zuo-Shan Wang,Liang-Sheng Liao
Two-dimensional transition metal dichalcogenides are of particular interest in high-performance photothermal conversion, yet there remains a huge challenge in their practical application in smart textiles for healthcare, energy, and personal protection. Herein, we controllably prepared MoS2 hollow nanospheres with a high photothermal conversion efficiency of 36% via a microemulsion-hydrothermal method, which was further applied to construct photothermal fibers for personal thermal management after a hot-blast dip-drying process. Because of the prominent photothermal effect, the temperature of the photothermal fibers sharply increases from the room temperature value of 25.0 to 55.5 °C in 60 s under near-infrared illumination with a power density of 500 W/cm2. Furthermore, the photothermal fiber pad demonstrated an obvious temperature enhancement of 38.0 °C from a skin temperature of 22.0 °C after it was irradiated by natural sunlight for 60 s. Significantly, the antibacterial elimination rates of the photothermal fibers for Escherichia coli and Staphylococcus aureus are ∼99.9 and ∼99.8%, respectively. This strategy affords an avenue toward the practical application of photothermal materials in smart fibers for personal thermoregulation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Richao Niu,Rubing Han,Yin Huang,Liming Dai,Hongan Zhao,Yining Wang,Junwu Zhu,Shaochun Tang,Jingwen Sun
Bimetallic compounds can offer higher electrochemical activity and capacity than monometallic ones owing to their rich chemical valences. Herein, the performance enhancement of monometallic compounds by introducing metal ions was demonstrated, and the effects of different metal ions were investigated. Through introduction of metal ions into LDHs under a hydrothermal environment, one kind of 2D/2D hierarchical CoM-LDH(M=Fe or Mn)/MXene composites were successfully synthesized. It was found that the introduced Fe ions extremely improves the specific capacity and the introduced Mn ions extremely enhances the rate capability of monometallic composite. The fabricated CoFe-LDH/MXene (CF-MX10) electrode exhibits a specific capacity of 808 F g −1 at current density of 0.5 A g −1 , much higher than that of CoMn-LDH/MXene (CM-MX10, 562 F g −1 ) and Co(OH) 2 /MXene (C-MX10, 270 F g −1 ). The high areal capacity or rate capacity are attributed to strong synergistic effect between CoM-LDH and MXene, as well as the introduction of metal ions that change the architecture and the electronic or ionic conductivity , which leads to much improved electrical conductivity and electrochemical stability.
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Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 22
·3748-3753
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IF 4.568
Ronghua Yi,Jin Wang,Xiaoping Yue,Yan Liang,Zhuoyao Li,Huixiang Sheng,Mengdan Guan,Yameng Zhu,Qizeng Sun,Li Wang,Xiao Huang,Gang Lu
Graphical Single-crystalline Bi 9 O 7.5 S 6 thin nanosheets were successfully synthesized by using a solvothermal method. The thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits a sensitive photoelectric response to light in a wide range of 400–800 nm. Bismuth-based compounds possess layered structures with a variety of stacking modes, endowing the compounds with diverse properties. As one type of bismuth oxysulfides, Bi 9 O 7.5 S 6 nanocrystals has great applications in photodetection; however, the responsivity of bulky Bi 9 O 7.5 S 6 is limited due to the poor charge separation. Herein, single-crystalline Bi 9 O 7.5 S 6 thin nanosheets are successfully synthesized by using a solvothermal method. The thickness of the obtained Bi 9 O 7.5 S 6 nanosheets is down to 15 nm and can be easily tuned by varying the reaction period. Moreover, the Bi 9 O 7.5 S 6 nanosheets show strong light absorption in the visible and near infrared range, making it a promising candidate in optoelectronics. As a demonstration, the thin Bi 9 O 7.5 S 6 nanosheets are used as active layer in an optoelectronic device, which exhibits sensitive photoelectric response to light in a wide range of 400–800 nm. The responsivity of the device reaches up to 1140 μA W −1 , and the performance of the device is stable after long-period illumination. This work demonstrates a great potential of the thin Bi 9 O 7.5 S 6 nanosheets in optoelectronic devices, and these nanosheets may also be extended to various optoelectronic applications.
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SOLAR ENERGY
·
2021
·
IF 5.742
Daoyong Zhang,Shizhong Sun,Xinyu Li,Xiang Li,Xin Liu,Qiulian Li,Hua Liao,Shurong Wang
In this paper, Cu 2 ZnSn(S x Se 1− x ) 4 (CZTSSe) thin-films with a front-graded band gap were prepared by plasma sulfurization. The method of selenization followed by low-temperature plasma sulfurization was adopted to effectively control the uneven diffusion of S in the absorption layer. By investigating and analyzing the grazing incidence X-ray diffraction, Raman spectroscopy, and PL spectra, the CZTSSe absorption layer with an S-rich top and S-poor bottom layer could be obtained by plasma sulfurization. The inhomogeneous distribution of S led to the formation of band gap gradients. Based on that, the band gap near the top of the absorption layer was determined to be 1.13 eV and the bottom band gap was 1.03 eV. Approximately 300 nm thick sulfur-rich CZTSSe films were found near the surface favoring an increase in the band gap at the interface, which could be attributed to a high open circuit voltage (V oc ). The establishment of the band gap gradient formed a barrier towards the motion of holes towards the interface and increased the effective interfacial recombination band gap, both of which significantly reduced the interfacial recombination. Finally, the CZTSSe thin-film solar cells with a band gap gradient were prepared by plasma sulfurization exhibited a power conversion efficiency (PCE) of 8.11%. Compared with CZTSSe thin-film solar cells without post plasma sulfurization, which had a PCE of 6.98%, the V oc of the CZTSSe solar cell improved considerably from 471.37 mV to 513.93 mV; however, it had little effect on short-circuit current density (J sc ).
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ChemSusChem
·
2021
·Vol. 15
·期 1
·e202101398
·
IF 8.928
Yinghui Bian,Weichuan Jiang,Yonglei Zhang,Lishun Zhao,Xiaohang Wang,Zichuan Lv,Shuai Zhou,Yuqing Han,Hui Chen,Meng-Chang Lin
Graphical A closer look at sulfur : An Al−S cell using an AlCl 3 /acetamide electrolyte based on the oxidation of S IV shows a high working voltage of 1.70–1.95 V, whereas the cell based on the reduction of S (S x 2− ) exhibits a voltage of 0.31–1.20 V. A high-voltage Al−S cell with 0.33 mAh capacity can successfully light up a red LED (forward voltage: 1.6–2.0 V) for 2 h. This work may help in promoting the development of high-performance and low-cost Al−S batteries. Al-based batteries are promising next-generation rechargeable batteries owing to the abundance of raw materials and their high potential energy density. The Al−S system has attracted considerable attention because of its high energy density and low cost. However, its low discharge voltage plateau (0.6–1.2 V) hampers its practical application. Herein, eight ionic liquids or deep eutectic solvents were studied as electrolyte candidates for an Al−S cell. This was the first study to demonstrate that an Al−S cell based on an AlCl 3 /acetamide electrolyte (1.3 molar ratio) showed high discharge voltage plateaus (1.65–1.95 V) and a charging cut-off voltage of 2.5 V in Al−S cells. An Al−S cell of 0.33 mAh capacity with the AlCl 3 /acetamide electrolyte successfully lit up a red LED (forward voltage 1.6–2.0 V) for around 2 h. This work may help in promoting the development of high-performance and low-cost Al−S cells.
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