JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Hui Li,Rui Da,Li-Quan Yao,Hu Li,Peng Tang,Jin-Rui Cai,Li-Mei Lin,Shui-Yuan Chen,Dong Wei,Li-Ping Cai,Gui-Lin Chen
Sulfoselenide Sb 2 (S,Se) 3 , as a potential light-harvester, possesses a flexibly tunable bandgap of 1.1–1.7 eV to match solar radiation spectrum. However, the preparation of a homogenous Sb 2 (S,Se) 3 film is still challenging due to the different growth kinetics in sulfide and selenide compound, which consequentially leads to phase separation, lattice disorder and unfavored band level. This dilemma also occurs in the simple and well-established close space sublimation (CSS) method, and poses a devastating carrier recombination in Sb 2 (S,Se) 3 solar cells. Herein, alloyed powders of Sb 2 (S,Se) 3 are exquisitely synthesized by a thorough gas-solid reaction, delivering a uniform and single phase composition distribution as well as finely-tunable S/Se ratio. Compared with a physically mixed powder source (Sb 2 S 3 /Sb 2 Se 3 ), this alloyed Sb 2 (S,Se) 3 source allows for the fabrication of a homogeneous Sb 2 (S,Se) 3 thin film by CSS, rendering improved ( hk1 ) orientation, dense morphology, a more consistent longitudinal S/Se ratio, and enhanced energy level arrangement. These advancements contribute to enhance carrier transport and reduce carrier recombination. As a result, the efficiency of the solar cell is remarkably boosted from 2.59% to 5.46%, which is among of the highest PCE of full-inorganic Sb 2 (S,Se) 3 devices fabricated through the CSS method.
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EUROPEAN POLYMER JOURNAL
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2024
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IF 5.8
Jingwei Jiang,Yunlong Sun,Zhipeng Wang
With the rapid growth of 5G communication technology, low-dielectric materials can decrease the loss of the signal during transmission. Hence, there is an urgent need to develop high-performance materials with low dielectric constant (D k ) and dielectric loss (D f ) at high frequency. In this study, we propose a strategy that combines bulk rigid quinoxaline structure and low polarizability trifluoromethyl group to prepare poly (aryl ether)s (PAEs) with low D k and D f at high frequencies. The effect of methyl substituents on the properties of PAEs was focuses on investigated. Accordingly, three difluoro-monomers containing quinoxaline structures were designed and prepared and novel quinoxaline-based PAEs with different numbers of methyl substituents were synthesized by nucleophilic condensation reactions with the bisphenol monomer hexafluorobisphenol A (BP6F). Test results that the resultant PAEs exhibited excellent thermal and solubility properties, with 5 % thermal decomposition temperatures ( T d5% ) in the range of 500−515 °C and glass transition temperatures ( T g ) reaching 225 °C. Furthermore, these PAE films show outstanding optical transparency, with cut-off wavelengths of 398−400 nm and above 87 % transmission at 800 nm. Most importantly, the novel PAE films possess ultra-low D k and D f , with the lowest values reaching 2.45 and 0.0024 at 10 GHz and maintain low water absorption (0.53–0.63 %). The excellent properties of novel quinoxaline-based PAEs provide its application potential in the field of high-frequency communications.
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CARBON
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2024
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IF 10.5
Tie Ma,Dan Li,ChenQi Wang,Ning Liu,Chao Wang,GuangPing Wu,Li Guo
Hard carbon materials are preferred as anode materials for sodium-ion batteries due to their abundance, low price, and environmental friendliness. However, doping-based modification usually induces low initial coulombic efficiency (ICE), which seriously affects the practical application of carbon materials. In this work, Fe-modified N/S co-doped porous carbon is prepared using the salt template method. Fe, N, and S are uniformly distributed on the porous carbon to form an interwoven network structure, providing abundant active sites. Moreover, during the electrochemical reaction, FeN x effectively catalyzes the generation of solid electrolyte interface (SEI) film, which reduces the consumption of Na + in the side reaction, leading to a high initial coulombic efficiency, and at the same time, the stabilized SEI film accelerates the diffusion of electrons and ions, effectively enhancing the multiplication rate performance. The NFSC exhibits a high specific capacity (371.3 mAh/g) by the co-coordination strategy and a high ICE (85.9 %). This study provides new ideas for research based on the modification of carbon materials.
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Journal of Cleaner Production
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2024
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IF 9.7
Chuantao Wang,Xiang Li,Xueting Lv,Xin Huang,Yueyue Zhao,Tiantian Deng,Jiale Zhang,Jun Wan,Yanzhong Zhen,Tuo Wang
The construction of S-scheme heterojunction with excellent redox ability holds promising prospects for photocatalytic environment remediation. However, the rationally design of the heterojunction interface to achieve efficient charge transfer still faces challenges. In this study, we fabricated a tight-contacted S-scheme heterojunction by in situ anchoring AgI nanoparticles onto WO 3 nanoplates. The significant difference in Fermi energy levels between WO 3 and AgI results in the formation of a space charge region around the interface and bending of the energy band, facilitating directional migration and spatial separation of charge carriers. This contributes to enhanced generation of superoxide radicals (•O 2 − ) and holes (h + ) active species, leading to a significant increase in chlortetracycline (CTC) degradation rate. The apparent rate constant for CTC removal using the WO 3 /AgI (WA-2) is approximately 15 times higher than that observed for pure WO 3 . Furthermore, WA-2 exhibits universal degradation effects on tetracycline (TC) and oxytetracycline (OTC). Molecular dynamics (MD) simulation reveals the synergistic adsorption effect of WO 3 and AgI on CTC and reactive oxygen species molecules. Based on Fukui function calculation of CTC molecules and degradation intermediates, liquid chromatography-mass spectrometry (LC-MS) analysis, photocatalytic degradation pathway over WO 3 /AgI was determined to be sequential demethylation followed by dechlorination and decarbonylation. These findings provide valuable insights into high-performance S-scheme heterojunctions interface design and elucidation of pollutant degradation mechanism.
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ACS Applied Nano Materials
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2024
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IF 5.3
Junchang Liu,Weijie Yuan,Minghui Zhu,Zhiheng Hu,Di Wu,Xue-Yang Ji,Dafeng Zhang,Xipeng Pu
The overuse of antibiotics has led to severe environmental pollution, thereby making it increasingly important to efficiently degrade them. To address this, a unique S-scheme heterojunction of the In2S3/In2O3 nanocomposite was successfully constructed using hydrothermal coupled with in situ formation in this work. The optimized In2S3/In2O3 nanocomposite exhibited a significant photocatalytic degradation of tetracycline (TC), achieving an 83% removal rate within 60 min, with enhancements of 1.78 times for In2S3 and 1.66 times for In2O3. Characterization, experimental results, and density functional theory (DFT) calculation collectively prove the efficient transfer of photoexcited carriers between In2O3 and In2S3, coupled with the successful construction of the S-scheme heterojunction with a well-arranged band structure. A potential pathway for developing photocatalysts with exceptional antibiotic removal capabilities has been provided by enhancing their reduction and oxidation capabilities of the S-scheme heterojunction through rational structural configuration.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Hao Jiang,Mei Yan,Hao Chen,Xue Chen,Yutuo Fu,Chongshen Guo
How to make full use of solar energy and improve the efficiency of charges separation of photocatalysis has been a concern for scientists all along. To achieve this, this work designed an n-n + homojunction of S-doped SnFe 2 O 4 and applied it to near infrared driven photocatalytic degradation and sterilization. The experimental results demonstrated that S doping significantly enhanced the photocatalytic performance of SnFe 2 O 4 . The degradation rate of ciprofloxacin and the removal rate of Staphylococcus aureus ( S. aureus ) reached up to approximately 65 % and 100 % after 6 h irradiation, respectively. The S-doping could increase the content of shallow trap states in SnFe 2 O 4 , effectively inhibiting the recombination of photogenerated electrons and holes. Moreover, S-doping also enhances the n-type character and forms n-n + homojunction. This n-n + homojunction generates a built-in electric field within the sample, which causes band bending and promotes photogenerated charges transfer and separation. Consequently, more carries are available for the generation of reactive oxygen species. Free radical quenching experiments and ESR tests show that •O 2 − is the main free radical in the photocatalysis. In addition, DFT calculations confirmed the enhanced activation of O 2 after S doping. This work provides a feasible way to effectively promote charges separation and transfer in metalloid-based photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yang Wang,Dong Xu,Xuan Yang,Jing-Hui He
Organic pollutants, such as ciprofloxacin (CIP), are ubiquitously detected in wastewater. However, their removal remains a challenge for conventional wastewater treatment technologies. Photocatalysis and peroxymonosulfate activation coupling are considered a promising strategy for the removal of recalcitrant organic pollutants. However, identifying optimal photocatalysts that can effectively couple with peroxymonosulfate activation and induce synergistic degradation of organic pollutants remains a challenge to be addressed. In this work, a novel S-scheme inorganic–organic heterojunction BiVO 4 /Cu-TCPP (BC) was fabricated. In situ X-ray photoelectron spectrum showed that the strong internal electric field of the S-scheme heterojunctions enabled efficient carrier transport. The generated photogenerated electrons could activate the peroxymonosulfate, which further promoted the separation of the carriers. The BC-vis-peroxymonosulfate system achieved 93.1% ciprofloxacin removal in 10 min with apparent rate constants k of 0.2426 min −1 , which is larger than most reported peroxymonosulfate systems. Electron paramagnetic resonance spectra and liquid chromatography mass spectrometry demonstrated that the synergistic coupling of S-scheme heterojunction with peroxymonosulfate activation significantly improved the catalytic activity of the reaction system and enabled rapid CIP removal via both radical and nonradical pathways. The BC-vis-peroxymonosulfate system demonstrated ultra-fast removal of other quinolone antibiotics and organic pollutants and strong environmental adaptability under various conditions, suggesting its great potential for practical application. This study provides new insights for the design of efficient S-scheme heterojunction coupled peroxymonosulfate activation for environmental remediation.
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POLYMER
·
2024
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IF 4.1
Jie Zhang,Qian Liu,Zijian Li,Guanwen Huang,Hailong Li,Xiuchen Li,Shouhai Zhang,Xigao Jian
The enhancement of thermal resistance and mechanical properties for the soluble poly(aryl ether ketone)s is an important research topic. Based on the idea of introducing twisted N-heterocyclic structure and utilizing the restriction of intramolecular chain rotation by bulky pendant groups, the thermo-resistance, mechanical properties, and surface properties of polymers are modulated while ensuring their solubility. A novel bisphenol-like monomer 1′,4-di(biphenyl)-6,6′-biphthalazin-1,4(2H,3H)-dione (DBBD) and corresponding N-heterocycle copoly (aryl ether ketone)s with pendant biphenyl groups (PDPEKs) are prepared. PDPEKs exhibit good thermal stability in air and nitrogen, and the glass transition temperature ( T g ) is in the range of 288–347 °C. In addition, the storage modulus retention rate of PDPEKs reaches 60.6 % at 250 °C. PDPEKs exhibit good solubility in N-methylpyrrolidone and 1,1,2,2-tetrachloroethane, performing good film-formation properties. The tensile strength of PDPEKs films is between 102 and 121 MPa, the Young's modulus is between 2.01–2.30 GPa, and the water contact angle of PDPEKs is in the range of 79°–84°.
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ACS Applied Energy Materials
·
2025
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IF 5.5
Wen Huang,Jiawei Zhang,Guoqiang Deng,Guang Zhu,Yaohui Chen,Chenxi Xu,Jigui Cheng
Anion exchange membrane fuel cells (AEMFCs) have emerged as a promising clean energy technology due to their high efficiency and the potential to eliminate the reliance on precious metal catalysts for the oxygen reduction reaction (ORR) at the cathode. Developing highly efficient nonprecious metal catalysts is crucial for enhancing AEMFC performance. In this study, we report a Co–S–N–C@MXene catalyst through sulfur doping and support loading. This catalyst demonstrates exceptional ORR activity, achieving a half-wave potential (E1/2) of 0.881 V. After 10,000 cycles of cyclic voltammetry (CV) testing, the E1/2 showed a minimal decline of only 14 mV, demonstrating excellent durability. Moreover, the AEMFC based on the catalyst achieved a peak power density of 466 mW cm–2.
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Journal of Energy Chemistry
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2025
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IF 14.9
Chenggong Niu,Yi Liu,Shuqing Zhou,Heyang Liu,Linyu Chen,Jingya Guo,Tayirjan Taylor Isimjan,Xiulin Yang
Triggering structural asymmetry can induce charge redistribution and modify electronic structures, which is of great significance for the design of high-performance hydrogen oxidation reaction (HOR) electrocatalysts. Herein, we propose a dual anion-induced strategy to create an innovative RuS 2 -RuO 2 heterostructure featuring abundant S-Ru-O interfaces (RuS 2 -RuO 2 @C). This RuS 2 -RuO 2 @C demonstrates an impressive mass activity of 2.61 mA μ g R u - 1 and an exchange current density of 2.96 mA cm −2 , surpassing Pt/C and other comparative samples by over 20 times. Durability assessments confirm the superior stability of RuS 2 -RuO 2 @C, with only minimal performance loss during operation. Density functional theory (DFT) calculations indicate that the asymmetric S-Ru-O configuration optimizes the interfacial electronic structure and shifts the d -band center closer to the Fermi level, effectively reducing the energy barrier of the rate-determining step (RDS) in the alkaline HOR process. Moreover, in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) characteristics disclose the formation of a substantial hydrogen bond network at the S-Ru-O interface, which aids in the desorption of H 2 O ad and facilitates the vital Volmer step in the HOR pathway.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2017
·Vol. 219
·期 3
·1700416
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IF 2.5
Wenjun Wu,Biaowen Wei,Jun Feng,Bin Chi,Shijun Liao,Xiuhua Li,Yigang Yu
Poly(arylene ether sulfone)s containing symmetric side-chain benzyltrimethyl ammonium groups are synthesized via Suzuki reaction, copolycondensation, and functionalization. Two series of anion exchange membranes, 4C- y -Q and 8C- y -Q, containing four or eight pendent benzyl or cationic groups are synthesized to clarify the steric effect of the benzyl groups on the water channels. 1 H NMR and transmission electron microscopy are used to study the chemical structure and morphology, respectively. These two series of membranes are assessed in terms of ion exchange capacity (IEC), water uptake, swelling ratio, λ, hydroxide ion conductivity (σ ), mechanical properties, thermal stability, and alkaline stability. The 4C- y -Q membranes show better-defined microphase separation morphology and higher ion conductivity (206.2 mS cm −1 at 80 °C) than most of the reported membranes. Ionic conduction efficiency (σ/IEC) can be improved and made higher than that of Nafion with lower ion transport activation energy. The obtained membranes with superior properties reveal their prospective application in anion exchange membrane fuel cells.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Kai Chen,Wentao Zhang,Yuhuan Zhang,Lunjie Huang,Rong Wang,Xiaoyue Yue,Wenxin Zhu,Daohong Zhang,Xu Zhang,Ying Zhang,Jianlong Wang
Although the salt-adjusted properties of nanomaterials have been extensively used for colorimetric assays of all kinds of analytes, their applications in the design of fluorescence sensor are very limited. Herein, a novel fluorescence aptasensor was developed for the sensitive determination of Bisphenol S (BPS) by the salt-adjusted fluorescence resonance energy transfer (FRET) between the zero-dimensional emitter (CQDs) and the two-dimensional absorber (MoS 2 nanosheets) and the roles of specific discrimination and protective effect of anti-BPS aptamer to layered MoS 2 . It is shown that layered MoS 2 can serve as a good fluorescent quencher towards carbon dots with decent quenching efficiency. Importantly, the established fluorescent method achieved satisfactory results for the determination of BPS with a good linear correlation from 0.05 μM to 2 μM and a detection limit of 2 nM. It is expected that this method may offer a new direction for the application of the phenomenon of salt-assisted aggregation of nanomaterials in designing high-performance fluorescent biosensors.
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