JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Zhurong Liang,Xueqing Xu,Nan Wang,Jun Fang,Junxia Wang,Gang Xu
Highly Cu-rich copper indium sulfide (CuInS 2 , CIS) quantum dots were synthesized utilizing copper chloride (CuCl) and indium acetate (In(Ac) 3 ) as metal cation precursors, combined with n-dodecanethiol (DDT) as a coordinating sulfur source and solvent. With excess of In(Ac) 3 , i.e. with Cu/In ratios of 1/4, together with Zn 2+ ions post-treatment, a relatively high photoluminescence quantum yield (QY) of ∼73% with long average lifetime of ∼359 ns has been obtained, which is proposed to be attributed to the Cu-rich defect states in the CIS nanocrystals (NCs) nuclei. Meanwhile, the formation of In-rich CIS–ZnS alloy, i.e. Zn–Cu–In–S (ZCIS) with high density of Cu vacancies, combined with the surface passivation of ZnS overlay resulted in a high QY. Finally, the formation mechanism of the ZCIS/ZnS with Cu-rich nuclei has been proposed.
研究领域:
材料科学
·
纳米技术
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 31
·10660-10672
·
IF 6.4
Yonggang Zhao,Congyan Xu,Zhineng Zhou,Yufei Chen,Ying Zhang,Lang Wu,Xu Su,Xinghuan Hu,Shurong Wang
High-temperature sulfoselenization is essential in producing Cu2ZnSn (S,Se)4 (CZTSSe) thin-film solar cells. At high temperature, the Cu2ZnSn(S,Se)4 phase-transition speed is fast, which causes grain transition to mature quickly, followed by grain decomposition. Although grain surfaces are relatively flat at low temperatures, the small grain and more grain boundaries lead to low efficiency. In this study, a dynamic-temperature sulfoselenization process was adopted to utilize both the advantages of high and low temperatures comprehensively. Different constant- and variable-temperature sulfoselenization processes were developed for annealing Cu–Zn–Sn–S precursor films prepared in the air using dimethyl sulfoxide (DMSO) and 2-methoxyethanol (MOE) dual solvent systems. As a result, CZTSSe films with a flat, holeless, and dense surface, and a single-layer large grain penetrating the whole cross-section were fabricated by a proper variable-temperature sulfoselenization process. Finally, 11.11% total-area power conversion efficiency (12.22% active area efficiency) of CZTSSe solar cells (without antireflection coating) based on the variable-temperature sulfoselenization process was achieved successfully. Compared with the highest efficiency of 9.10% of CZTSSe film solar cells fabricated from the stable-temperature sulfoselenization annealing process, the efficiency was improved by 22%. The variable-temperature annealing processes in this study can also be applied to the preparation of other multi-element thin-film semiconductor materials.
研究领域:
材料科学
·
光伏技术
·
半导体薄膜
·
可再生能源
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高影响因子
POLYMER
·
2020
·
IF 4.231
Bin Shen,Hongting Pu
A new monomer , propargyl-1-methylimidazolium bromide, is synthesized. A series of poly(ether sulfone)s with pendent imidazolium (PES-Im-x) are synthesized from poly(ether sulfone)s with azide via nucleophilic polycondensation , bromination, and azidation, which are then reacted with propargyl-1-methylimidazolium bromide via click chemistry. The membranes are prepared sequentially via solution casting and ion exchange, which exhibit good alkaline stability under basic and elevated temperature conditions. The micro-phase separation of the membranes is observed on transmission electron microscopy . The conductivities of the membranes achieve in the range of 3.53 × 10 −2 to 5.76 × 10 −2 S cm −1 at 80 °C, which are related to the introduction of dense imidazolium groups on the side chains of the polymers. The designed structure facilitates the aggregation and transport of the ions in the membranes. The membrane electrode assembly based on PES-Im-38 with a power density of 18.0 mW cm −2 at 60 °C is obtained. In addition, all these membranes show good dimensional stability and thermal stability. It is demonstrated that click reaction may provide a viable strategy for the further preparation of high performance anion exchange membranes .
研究领域:
材料科学
·
高分子化学
·
能源材料
·
电化学
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Hui Zhuang,Zixing Guan,Bimin Lin,Wenxi Huang,Yuanfu Deng
Heteroatom doping enhances the electrochemical properties of battery electrodes, but conventional multi-step syntheses limit practical applications. Herein, we report a single-step pyrolysis strategy for simultaneous nitrogen–sulfur codoping of anatase TiO 2 microspheres (NS-TiO 2 ) using thiourea as a dual-functional precursor. X-ray photoelectron spectroscopy reveals a synergistic dual-site doping mechanism: sulfur substitutes at Ti sites (2.33 surface at.%) while nitrogen occupies interstitial positions (1.48 surface at.%). This architecture, alongside codoping-induced Ti 3+ defect states (∼3.77%) and oxygen vacancies, inherently enhances electronic conductivity and facilitates Na + transport. Consequently, the charge-transfer resistance decreases dramatically from 156.5 Ω in undoped TiO 2 to 49.48 Ω in the codoped material, which promotes predominant pseudocapacitive charge storage (84% at 2 mV·s −1 ). This optimized configuration delivers exceptional rate capability (55.1 mAh·g −1 at 5 A·g −1 ) and outstanding long-term cyclability (95.9% capacity retention over 2000 cycles at 1 A·g −1 ), significantly outperforming single-element doped analogues. Ultimately, this work establishes clear design principles for multi-element doped metal oxides, uniting synthetic simplicity with superior electrochemical functionality.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jianle Wang,Xueming Liu,Hong Deng,Dongye Zhao,Qiulin Yang,Zhihua Zhu
Various sulfur- and iron-bearing materials have been shown promising for reductive immobilization of Cr(VI) in water and soil. Yet, composite Ca-Fe-S materials and the effects of water chemistry and material aging have not been investigated. In this work, we prepared a type of Ca-Fe-S microparticles under the atmospheric conditions through a facile one-pot approach, and tested the particles for reductive immobilization of Cr(VI) in solution and soil. Ca-Fe-S showed 40 % higher removal efficiency of Cr(VI) in solution than FeSO 4 and 10 % higher than CaS x on the basis of equal molar dosage. When a Cr-laden soil was amended by Ca-Fe-S, the leachable concentration of Cr per the toxicity characteristic leaching procedure remained below the regulatory limit of 5 mg L −1 after 730 days of curing, while FeSO 4 and CaS x failed to meet the regulatory threshold. Ca-Fe-S served as a slow-releasing source of Fe 2+ and S 2- , which were able to convert Cr(VI) into the stable final product of Cr(OH) 3 . Ca-Fe-S was able to perform well under a wide range of pH (3.0–9.0) and in the presence of high concentrations of coexisting ions (5 mmol L −1 of Cl - , SO 4 2- , or HCO 3 - ). Moreover, the material remained effective when aged under the atmospheric conditions for 14 days. This study showed that Ca-Fe-S is a highly effective material for efficient sequestration of Cr(VI) in soil and groundwater under various water chemistry and materials aging conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Dongdong Xu,Zhigao Xue,Lei Han,Kai Tao
Bimetallic sulfides with superior electrochemical activity are extensively explored as electrode materials for electrochemical energy related applications. However, their utilizations are impeded due to unfavorable faradaic reaction kinetics and poor electrochemical stability. To overcome these defects, this study reports interface engineering of heterogeneous nanosheet arrays on Ni foam (NF) through surface modification of metal-organic framework (MOF)-derived zinc cobalt sulfide (Zn/Co-S) with CeO 2 nanoparticles (NPs). MOF-derived porous Zn/Co-S nanosheets have highly exposed electrochemical active sites and abundant channels for charge transport. The strong interfacial coupling between Zn/Co-S and defective CeO 2 leads to fast charge transfer, thereby improving electrochemical activity. The CeO 2 can also prevent Zn/Co-S from degrading in KOH solution. Moreover, the self-supported electrode shows high electronic conductivity and strong adhesion with the conductive substrate. Therefore, the specific capacity and electrochemical stability of resulting Zn/Co-S@CeO 2 /NF are significantly higher compared with Zn/Co-S/NF. Furthermore, an asymmetric supercapacitor (ASC) based on Zn/Co-S@CeO 2 /NF and activated carbon (AC) exhibits high energy storage capability (42.4 Wh kg −1 ) and outstanding operating durability (91.1 % after 8000 cycles). These results demonstrate that the as-prepared electrode is a superior candidate for electrochemical devices .
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Molecular Catalysis
·
2023
·
IF 4.6
Kexin Huang,Yanxing Hui,Zhongyun Yang,Muhammad Waqas,Fangfang Fan,Limin Wang,Xiaotian Liu,Qiulan Huang,Dujuan Huang,Du-Hong Chen,Youjun Fan,Wei Chen
Electrochemical energy (e.g., fuel cell and metal-air batteries) is featured by large theoretical energy density, high conversion efficiency, safe operation and pollution-free emission. However, the sluggish dynamics of oxygen reduction reaction (ORR) and high cost of noble metals hinder their widespread commercial applications in electrochemical energy devices. Herein, we present a method for the preparation of the N, S co-doped carbon film wrapped Co nanoparticles (Co/NSC) for ORR by aging and then pyrolyzing the mixture of cobalt salt and 1-(p-Toluenesulfonyl)imidazole. The co-doping of N and S facilitates the electron rearrangement of the carbon film, resulting in a rapid electron transfer. The core-shell structure enhances the interaction between N, S co-doped carbon film and Co nanoparticles. These features endow the Co/NSC catalyst an excellent ORR with a half-wave potential of 0.860 V and limiting current density of 6.2 mA cm -2 , besides the superior anti-methanol. The Co/NSC catalyst as the air cathode grants the assembled zinc-air battery high open circuit voltage (1.467 V), large peak power density (156.2 mW cm -2 ), great specific capacity (747.9 mAh g Zn -1 ), and excellent stability. Thus, the prepared Co/NSC catalyst exhibits a promising application in zinc-air battery. This work provides an approach for the synthesis of the carbon-shell coated non-noble metal catalyst and its subsequent applications in oxygen electrocatalysis.
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Solar RRL
·
2023
·Vol. 7
·期 12
·2300188
·
IF 7.9
Yichao Wang,Zipeng Xing,Chunxu Wu,Meijie Liu,Jiapeng Gao,Na Zhang,Zhenzi Li,Haixia Liu,Wei Zhou
The development of heterojunction composite photocatalysts with sophisticated charge transfer mechanisms and interfaces is a promising approach to enhance photocatalytic efficiency. Herein, for the first time, a peanut-like Zn 0.5 Cd 0.5 S/BiVO 4 S-scheme heterostructure visible-light composite photocatalyst via a two-step hydrothermal method is synthesized. S-scheme heterostructures, which can maintain the maximum redox capacity in the conduction and valence bands of the catalyst, have been established as an effective charge transfer mode in the field of photocatalysis. The Zn 0.5 Cd 0.5 S/BiVO 4 heterojunction photocatalyst exhibits 99.52% degradation efficiency for tetracycline-based organic pollutants under visible light irradiation. In addition, the photocatalytic hydrogen production efficiency of the composite catalyst is as high as 8969.58 μmol g −1 h −1 , which is 69.24 and 4.35 times higher than that of single BiVO 4 and Zn 0.5 Cd 0.5 S, respectively. Through density functional theory calculations and experimental studies, the material conformed to the charge transfer mode of the S-scheme heterojunction is determined. The improved photocatalytic efficiency can be attributed to the formation of S-scheme heterogeneous interface, which bends the energy band at the interfacial contact, and the formation of an internal electric field, which hinders rapid charge recombination and prolongs the lifetime of charge carriers.
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高影响因子
ARCHIVES OF MICROBIOLOGY
·
2023
·Vol. 205
·期 5
·1-10
·
IF 2.8
Guo Hui,Yang Wei,Lei Bingshuang,Zhao Fengju,Guo Lili,Qian Junqing
Food safety is a major public health concern all over the world. Therefore, the prevention of food contamination is becoming extremely crucial. In this study, an antimicrobial nanoemulsion composed of water-soluble nisin and fat-soluble octanoic acid was successfully prepared. The results showed that the average particle size and the polymer dispersity index of the nisin−octanoic acid (NOA) nanoemulsion were around 52.21 nm and 0.253, respectively. The NOA nanoemulsion required less amounts of nisin and octanoic acid to achieve the effective antimicrobial effect against Escherichia coli and Staphylococcus aureus . In addition, the growth curves of E. coli and S. aureus were determined. The OD 600 of NOA nanoemulsion was significantly lower than free nisin after being incubated for 24 h ( p < 0.001), indicating that the antimicrobial effect of NOA nanoemulsion was outstanding. Meanwhile, the synergistic antimicrobial property of NOA nanoemulsion against E. coli and S. aureus was significantly better than free nisin under nonacid conditions ( p < 0.05). Overall, the results of this study may provide guidance for the further application of nisin in more forms.
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DOI
PubMed
高影响因子
Batteries & Supercaps
·
2023
·Vol. 6
·期 7
·e202300145
·
IF 5.7
Mengmeng Liu,Yan Zhang,Zhao Xu,Xuguang Han,Wenshan Gou,Yifei Sun,Chang Ming Li
Graphical Microporous biomass carbon : The Enteromorpha-derived nitrogen-doped highly microporous carbon (HMCs) was prepared by carbonization and activation. Due to the high specific surface area, rich pore structure and nitrogen doping of HMCs, HMCs-3@S/SeS 2 cathode exhibits excellent cycling stability and rate performance in aqueous Zn-chalcogen batteries. Rechargeable aqueous zinc-chalcogen batteries have become a rising star in the energy storage systems due to the high abundance, low cost and high theoretical specific capacity of the chalcogen cathodes (S, Se). However, there are still some challenges in its practical application, such as low utilization of active substances due to the poor conductivity of chalcogen and sizable volume changes during charging/discharging. In this work, for the first time, nitrogen-doped highly microporous biomass-derived carbon (HMCs-3) was synthesized as a sulfur-loaded cathode for aqueous zinc-chalcogen batteries. A high specific surface area (3349.4 m 2 g −1 ) and a wealthy micropore of HMCs-3 provide enough space to load the active substances and allow electrolytes to access reaction sites while well alleviating the volume changes of sulfur during the cycling process. As a cathode for aqueous zinc-chalcogen batteries, HMCs-3@S delivers a high reversible discharge capacity (591 mAh g −1 at 0.1 A g −1 ), an excellent rate capability (477 mAh g −1 at 3 A g −1 ) and good cycling stability (559 mAh g −1 after 100 cycles at 1 A g −1 ). The excellent performance of this biomass-derived carbon holds great promise for practical applications in aqueous zinc-chalcogen batteries.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yu Peng,Bei Cheng,Liuyang Zhang,Jingjing Liu,Jiaguo Yu
As we all know, formaldehyde (HCHO) is extremely harmful to human health and has been identified as a primary carcinogen by the World Health Organization. Therefore, there is an urgent need to design efficient formaldehyde-sensing materials. In this work, a highly responsive formaldehyde sensor of In 2 O 3 @ZnO derived from MIL-68(In)@ZIF-8 precursor was successfully prepared. By adjusting the ratio of In 2 O 3 and ZnO, it can be found that the performance of the resulting sensor has greatly improved under 100 ppm HCHO at an operating temperature of 220 °C and the detection limit can be as low as 4 ppb. Additionally, it also has excellent selectivity (Q≥10), anti-interference (the deviation value≤3.5%), and long-lasting stability (the variation value≤4%). Such distinguished sensing performance can be attributed to the metal-organic framework (MOF) derived step-scheme (S-scheme) heterojunction , which ultimately increases the adsorption of oxygen and HCHO. This work verifies that ingenious heterojunction construction can significantly improve gas sensing performance.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yining Zhang,Mengyang Xu,Weiqiang Zhou,Xianghai Song,Xin Liu,Jisheng Zhang,Songtao Chen,Pengwei Huo
Step-scheme (S-scheme) heterojunctions can efficiently promote the separation of photogenerated carriers while maintaining the strong oxidation/reduction ability of photocatalysts; thus, research attention on S-scheme heterojunctions is increasing year by year. In this study, the S-scheme ZnO@ZnIn 2 S 4 (ZnO@ZIS) heterojunction was prepared successfully. Then, electron spin resonance (ESR) characterization was applied to prove the successful construction of the S-scheme heterojunction. Photoluminescence (PL), time-resolved photoluminescence (TRPL), and photoelectrochemical experiments have demonstrated efficient interfacial charge transport in ZnO@ZIS. Finally, the mechanism of CO 2 activation and electron transport was investigated by in situ Fourier transform infrared spectroscopy (FT-IR) and discrete Fourier transform (DFT) calculation analysis. The 40-ZnO@ZIS composite showed the best activity under light, and its CO and CH 4 yields reached 39.76 and 3.92 μmol∙g −1 ∙h −1 , respectively. This study provides a solution for optimizing the photocatalytic reduction activity of semiconductor photocatalysts by constructing S-scheme heterojunction materials to improve the CO 2 reduction capacity.
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高影响因子
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