CATALYSIS TODAY
·
2026
·
IF 5.1
Xiangdi Liu,Yihang Zhang,Wenwen Tian,Hongshang Peng
The solar-driven synthesis of hydrogen peroxide (H 2 O 2 ) using graphitic carbon nitride (g-C 3 N 4 ) is inherently limited by rapid charge recombination and insufficient light absorption. To address this issue, pre-synthesized nitrogen and sulfur co-doped carbon dots (N,S-CDs) were introduced onto g-C 3 N 4 nanosheets via a hydrothermal pre-anchoring strategy followed by calcination. The as-synthesized N,S-CDs/g-C 3 N 4 composites exhibited an enhanced H 2 O 2 production rate (1162.8 μmol·g −1 ·h −1 ), which was approximately 4.7 times higher than that of pristine g-C 3 N 4 . The improvement of photocatalytic activity was primarily attributable to the construction of step-scheme (S-scheme) heterojunction, which not only expedited the spatial separation of photogenerated charge carriers but also preserved the high redox potentials essential for efficient H 2 O 2 synthesis. Furthermore, the N,S-CDs broadened the light absorption range, enabling more effective utilization of visible light. This work provides a promising strategy for rational design of CD-based heterojunctions toward high-efficiency solar-driven H 2 O 2 production.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Fei Chen,Yiluo Zhang,Qing Hu,Shiyu Cao,Shangbin Song,Xinqi Lu,Qiang Shen
Traditional liquid lithium-sulfur batteries have two key problems: poor safety and shuttle effect . These two challenges can be overcome by using solid-state electrolytes. But poor ionic and electronic conductivity due to solid/solid contact between the electrode and the electrolyte for all-solid-state lithium-sulfur batteries (ASSLSBs). Here, we have synthesized Li 6.4 Ga 0.2 La 3 Zr 2 O 12 (LLZO) conductive ceramics with high ionic conductivity . LLZO is used as the lithium-ion conductor and multi-walled carbon nanotubes (MWCNt) are used as the electronic conductor to form S/MWCNt/LLZO by the thermal diffusion method, resulting in an e − /S/Li + conductive network. The prepared S/MWCNt/LLZO composite material, composite solid electrolyte, and lithium metal are assembled into ASSLSBs. After 50 cycles, the high capacity of 825 mAh·g −1 is maintained with 72.62% capacity retention at 0.2C and 45 °C. The higher capacity indicates the success of forming a conductive network that can improve the electrochemical performance of ASSLSBs. At 0.2C, the capacity of the S/MWCNt/LLZO composite cathode remains at 873 mAh·g −1 after 60 cycles when the operating temperature is increased to 60 °C, indicating good cycle performance.
研究领域:
材料科学
·
能源存储技术
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POLYMER SCIENCE SERIES B
·
2024
·Vol. 65
·期 6
·842-857
·
IF 1
Wanting Zhao,Su Qin,Lyu Ya
Abstract In this paper, tung oil-linseed oil (TO-LSO) and styrene-linseed oil (STY-LSO) were used as raw materials of sulfur-rich copolymers, which were then reversed vulcanized with S 8 at 130°C, and the gel time of the reaction was recorded. At the same time, 1 H NMR, DSC, XRD, sodium sulfite titration and other characterization methods were used to measure the reaction degree, verify the conjugated structure to improve the reaction degree, and study the synthesis mechanism of sulfur-rich copolymer. The results show that the conjugated structure can improve the reaction degree. And when the proportion of TO and STY is 20 and 10% respectively, the reaction gel time is shortened, the reaction degree is greatly deepened, and the effect of promoting polymerization can be significantly obtained. The synthesis mechanism of copolymer is the result of conjugated structure and diallyl group. The self-repair of sulfur-rich copolymers at different temperature and holding time by hot press shows that poly(20-TO-LSO-50S) can realize the S‒S bond self-repair after being compressed at 120°C for 4 h, and the surface of polymer disc was smoother and more uniform. However, poly(10STY-LSO-50S) can be repaired only after being compressed for 8 h. TO can not only enhance the synthesis process, but also enhance the performance of sulfur-rich materials and broaden the application field.
研究领域:
材料科学
·
化学工程
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Jun Wu,Ye Wang,Song Zhang,Yuxiang Liu,Feng Wang
Photocatalytic conversion of benzyl alcohol (BA) into value-added fine chemicals and hydrogen (H 2 ) in water medium provides a novel strategy for green synthesis. The construction of Z-scheme heterostructures not only realize enhanced charge-separation efficiency, but also remain strong drive force for photocatalytic reaction, which exhibit great potentials toward simultaneously generating benzaldehyde (BAD) and H 2 . Herein, we report a noble-metal-free Z-scheme photocatalytic system consisting poly(dibenzothiophene-S,S-dioxide) (PSO) and α-Fe 2 O 3 for selective oxidation of BA with synchronous H 2 production. Such nanocomposites can effectively transfer and reduce the recombination of photoexcited charge carriers, therefore maintaining the oxidizability of holes of α-Fe 2 O 3 and the reducibility of electrons of PSO. As expected, PSO-Fe 2 O 3 with a mass of ∼5 mg under optimal composition ratio exhibited an impressive photocatalytic activity with BAD and H 2 yields up to 23.1 and 29.5 μmol h −1 , respectively, which is among the top photocatalytic performance reported so far for selective photocatalytic oxidation of BA in the aqueous solution.
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MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Bin Wang,Miao Tang,Wanting Li,Wenjing Dong,Xiaowen Ge,Naibao Huang
In order to increase the activity and decrease the cost of oxygen reduction reaction (ORR) catalyst, S self-doped porous carbon nanospheres ORR catalyst was prepared by pyrolyzing the block copolymer F127 grafted with 3-mercapto-propanoicaci. The composition and microstructure were characterized and its electrochemical performance was also investigated in O 2 -saturated 0.1 M KOH solutions. The results showed that, among all the obtained samples, C-S-750 had a porous carbon nanosphere structure with the doped sulfur of 7.08 at % and a maximum specific surface area of 776.3 m 2 /g. The onset potential, half-wave potential and limiting current density of C-S-750 were 0.92 V (versus RHE) and 0.80 V (versus RHE) and 5.77 mA/cm 2 @0.45 V in O 2 -saturated 0.1 M KOH solution, respectively, which were close to that of commercial 20% Pt/C catalysts. This provides a new way to introduce and increase the doped heteroatom in metal-free ORR catalysts.
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EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Yajun Ren,ZhuanZhuan Zhang,Wenlong Xia,Qifeng Zhou,Xiaofeng Song
Poly(L-lactide) (PLLA) was one of the most well-known biodegradable polyesters. Although its thermo-responsive shape memory (SM) function has been studied by proper program, high transformation temperature is not suitable in some biomedical applications. Water-responsive SM polymer is an alternative choice and exhibits great potential because it is harmless to the cells and tissues of organisms. In the work, a novel PCL-(PMVS- s -PAA)-PCL-PTMG-PCL-(PMVS- s -PAA)-PCL copolymer was devised as an additive to endow PLLA with water-responsive SM capability. The incorporated PLLA was characterized by cross-section, water contact angle, differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Inserted PTMG segment and assisted ambient temperature were contributed to its SM behaviors. The shape fixation ratio and shape recovery ratio were 92.0% and 94.2%, respectively. The schematic diagram between internal microstructures and macroscopic properties was proposed. At the same time, the incorporated PLLA showed excellent toughness. So the obtained SM material would be promising for medical and biomimetic fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xianwei Geng,Ruowei Yi,Xiangfei Lin,Chenguang Liu,Yi Sun,Yingchao Zhao,Yinqing Li,Ivona Mitrovic,Rui Liu,Li Yang,Cezhou Zhao
Lithium-sulfur (Li–S) batteries have attracted more and more attention in recent years, as their theoretical capacity is several times larger than conventional lithium-ion batteries and they have a high energy density in secondary battery systems. In our work, a titanium carbide - titanium dioxide/single-walled carbon nanotube/sulfur (TiC–TiO 2 /SWCNT/S) cathode with high conductivity and effective polysulfides adsorption is prepared by a facile method for fabricating Li–S batteries. The batteries with this composite cathode show a good performance at 0.1 C due to relatively high utilization of sulfur, reaching 1338.6 mAh·g −1 specific capacity at first cycle and retaining 802.5 mAh·g −1 after 100 cycles. Meanwhile, it presents an excellent rate performance with 711.2 mAh·g −1 at 4 C, and recovers to 1006.9 mAh·g −1 when the current returns to 0.1 C. Also a slow capacity decay (0.045% decay rate per cycle) is observed at 1 C. These results suggest that a small amount of SWCNT can increase the conductivity of the whole composite to a great extent, and the strong adsorption ability of TiO 2 increases the cycle life. This work offers an efficient and low-cost strategy to obtain high performance batteries with great potential for commercial applications.
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SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Yiqi Wei,Yinglin Yan,Yiming Zou,Mangmang Shi,Qijiu Deng,Nana Zhao,Shiyu Chen,Jiaming Lin,Rong Yang,Yunhua Xu
Lithium-sulfur (Li-S) battery processes high theoretical capacity (1675 mA h g −1 ) and energy density (2600 Wh kg −1 ), which was widely accepted as one of the most promising candidates for energy storage devices. In this presented study, bamboo-derived hierarchical porous carbon (BDPC) was adopted as a conducting substrate for containing S. Soft polystyrene (PS) and polyaniline (PANI), were prepared as coating layers. The main purpose is to figure out the specific roles that the polymer shells and the heteroatoms doped on polymer backbone play during cycles. The ternary products were characterized by structural analysis and electrochemical testing. The results indicate that, as compared to BDPC/S, the PS@BDPC/S electrode displays higher capacity retention during long-term cycles, especially at the high current rate. It is attributed to the integrated coating shell, which provides physical confinement and reserves spaces for restraining volume expansion. It is noted that the PANI@BDPC/S electrode presents a higher initial capacity, remarkable long-life performance, and excellent rate property. The outstanding performances are closely related to the nitrogen atom doped on PANI backbone, they provide not just abundant polar conducting sites for fast electron/Li-ion transport but strong chemical anchoring for restricting the migration of polysulfides . Therefore, our study poses a clearer understanding of the functionalized polymers used in Li-S battery.
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RSC Advances
·
2018
·Vol. 8
·期 66
·37811-37816
·
IF 2.936
Cejun Hu,Yingna Chang,Ruida Chen,Jijin Yang,Tianhui Xie,Zheng Chang,Guoxin Zhang,Wen Liu,Xiaoming Sun
The intrinsic polysulfide shuttle in lithium–sulfur (Li–S) batteries have significantly limited their practical applications. Conductive carbon materials with heteroatom doping and rich porosity is the most common strategy for the effective prevention of polysulfide shuttle, but are usually obtained with high costs and tedious procedures. Herein, we managed to obtain highly porous N, S-codoped carbon materials (NS-C) through treating waste plastic of polyvinylchloride (PVC) with KOH. The resulting NS-C was revealed to be highly efficient hosts for sulfur cathode, achieving large reversible capacities of 1205 mA h g−1 and 836 mA h g−1 at 0.1C and 1.0C, respectively, and remaining at 550 mA h g−1 after 500 cycles at 1C rate, showing an outstanding cycling stability. The significantly enhanced cycling performance was mainly ascribed to both the hierarchically porous structure and heavy N, S co-dopants, which respectively provided physical blocks and chemical affinity for the efficient immobilization of intermediate lithium polysulfides. The results provide an effective paradigm in the surface chemistry and sulfur cathode materials design for high-performance Li–S batteries and a new application for recycled plastic waste.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 25
·期 3
·329-337
·
IF 1.964
Jiangtao Liu,Guofei Chen,Xingzhong Fang
A series of isomeric poly(thioether ether imide)s (PTEIs) containing both thioether and ether linkages were prepared by nucleophilic substitution reaction of isomeric bis(chlorophthalimide)s with 4,4′-thiobisbenzenethiol. The inherent viscosities of these polymers were in the range of 0.40–0.56 dL/g in m -cresol at 30°C. The T g values of PTEIs were 196–236°C; T 5% values reached up to 509–529°C in nitrogen and 508–534°C in air, which indicated this kind of polyimide possessed excellent thermal stability. The hydrolytic stability was arranged in the order: a > b > c > d > e, and improved with increasing the content of 3-substituted phthalimide unit in the polymer backbone. Flexible films could be cast from the polymer solution with a solid content of 10%. The PTEI films exhibited good mechanical properties with tensile strengths of 90–104 MPa, elongations at break of 6.6–7.9%, and tensile moduli of 2.3–2.6 GPa. The minimum complex viscosity of PTEIs c was about 100 Pa·s at 310°C and the minimum melt viscosity of PTEIs (a–e) decreased with increasing the content of unsymmetrical 3,4′-substituted phthalimide units. Copyright © 2014 John Wiley & Sons, Ltd.
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FORENSIC SCIENCE INTERNATIONAL
·
2018
·
IF 1.974
Ting Wang,Baohua Shen,Hejian Wu,Jingying Hu,Huili Xu,Min Shen,Ping Xiang
Methamphetamine (MA) and amphetamine (AM) are widely abused drugs. These compounds contain a chiral center, and their enantiomers exhibit different pharmacologic, pharmacokinetic, and metabolic properties due to differences in binding affinities to their receptor sites. Until now, there was a lack of information on the decline in the concentration of drugs in hair after abstinence. A simple procedure for the chiral separation and determination of methamphetamine (MA) and its metabolite amphetamine (AM) enantiomers by LC–MS/MS in hair samples has been developed and fully validated. The LODs and LLOQs were 0.02 ng/mg and 0.05 ng/mg for all analytes, respectively. This method was successfully applied to both real hair specimens from chronic MA users and after the discontinuation of MA. The concentration of total MA, and total AM in fifty-eight authentic hair specimens ranged from 7.8 ng/mg to 521.0 ng/mg, and from 0.3 ng/mg to 84.0 ng/mg, respectively. Both enantiomers of MA and/or AM were detected in seven of fifty-eight authentic hair specimens. Hair specimens were from thirteen women with a known history of MA abuse, who went to a rehabilitation center and ceased consuming MA (for 4–5 months). The S -isomers of MA and AM were detected in all the 5–6 cm segments. Both enantiomers of MA were detected in nine of the 5–6 cm segments and the enantiomers of AM were found in only five of the nine samples. Assuming a hair growth rate of 1 cm/month, the mean hair elimination half-lives of S -MA, R -MA, S -AM, and R -AM were 0.64(95% CI, 0.46–0.96), 0.58(95% CI, 0.41–0.93), 0.62(0.49–0.88), and 0.50 months (95% CI, 0.42–0.56), respectively. With the developed method, R/S -MA and R/S -AM could be detected in the hair of former drug users for approximately 4 months after abstinence. S -MA is the most commonly found analyte in hair segments and is principally used by abusers. Our results suggest that to evaluate the discontinuation of MA abuse after a 6-month period of abstinence, a 3-cm proximal hair segment should be free of MA at the SOHT proposed cut-off level.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jingting Sun,Shangshang Wang,Xingyu Liu,Huan Yu,Jiaming Li,Chao Liu,Qinfang Zhang,Zhigang Zou
Photocatalytic hydrogen production (PHE) technology has emerged as a sustainable approach to convert solar energy into hydrogen energy, exhibiting significant potential for clean energy applications. In this study, an ultrasonic-assisted method was adopted to fabricate S-scheme MoSe 2 /Mn 0.5 Cd 0.5 S (MoSe 2 /MCS) composites, where intimate heterostructures are formed through interfacial Mo–S bonds between MCS and MoSe 2 . The atomic-level Mo–S bonds establish charge transport pathways and enable directional control of charge transfer. The as-constructed S-scheme MoSe 2 /MCS photocatalysts exhibit two critical advantages: enhanced charge carrier separation rate and improved overall redox capacity. Under visible-light irradiation, the MoSe 2 /MCS composites significantly outperform pure MCS in PHE performance. The optimal 5-MoSe 2 /MCS composite demonstrates the superior PHE activity, achieving an apparent quantum yield value of 71.16 % at 400 nm and remarkable photocatalytic stability. Key characterization techniques, including (solution-based) time-resolved photoluminescence technique, theoretical calculation, photoelectrochemical measurements, were employed to elucidate the positive correlation between ion-carrier interaction and charge separation efficiency, thereby enhancing the PHE performance. Based on experimental analysis and theoretical calculation, a plausible PHE mechanism for the S-scheme MCS composites is revealed and discussed in detail. These findings provide valuable insights for designing high-efficiency S-scheme heterostructured composites with interfacial chemical bonds.
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