查找使用阿拉丁产品的科研文献

Ultrasonic spray pyrolysis-assisted preparation of CoS for stable, uniform and efficient counter electrode in dye-sensitized solar cells

Shuang Lu,Yinglin Wang,Chunxia Wu,Yichun Liu,Xintong Zhang

Searching for large-scale, non-Pt, efficient counter electrode (CE) materials is still a key challenge to realize the applications of high-performance dye-sensitized solar cells (DSSCs). Herein, we report the spray fabrication of stable, uniform and efficient CoS counter electrode at temperature no higher than 100 °C from CoS nanoparticles prepared by the ultrasonic spray pyrolysis (USP) method. The as-fabricated USP-assisted CoS CEs exhibit comparable electrocatalytic activity to the traditional thermolyzed Pt CE, generating a power conversion efficiency of 8.6% for unoptimized DSSCs. This CoS CEs also exhibited prominent electrochemical and mechanical stability, uniform electrocatalytic activity at the size of 10 × 10 cm, and good bending durability when deposited on flexible ITO/PEN conductive substrates, manifesting the merits of this USP-based strategy for the development of high-performance non-Pt electrocatalysts.

Advantageous Role of N-doping on K@Al in COS/CS2 Hydrolysis: Diminished Oxygen Mobility and Rich basic sites

Rui Cao,Xueqian Wang,Ping Ning,Yibing Xie,Langlang Wang,Yixing Ma,Xiang Li,Hui Zhang,Jingye Liu

Basic sites are important to promote carbonyl sulfide (COS) and carbon disulfide (CS 2 ) hydrolysis activity while improving the oxidation resistance of hydrolysis catalysts is a challenge. Here, we report an N -doped alumina-based catalyst ( N -K@Al), where the complete hydrolysis removal of COS and CS 2 by the N -doped catalyst was extended up to 15 h at 160 °C, and the turnover frequency (TOF) value of the catalyst was increased from 0.85 × 10 -2 s −1 to 1.16 × 10 -2 s −1 . The results showed that the strong interaction between nitrogen and potassium decreased the reactive oxygen density and activated –OH, weakening the oxygen mobility. In addition, the beneficial effects of N -doped included the addition of moderately and weakly basic sites by pyridine N. The optimized N -K@Al showed good catalytic performance in the hydrolysis of COS and CS 2 removal with lower reaction temperature and higher total hydrogen sulfide yield. Density functional theory calculations revealed that N -K@Al reduced the Gibbs free energy of COS and CS 2 hydrolysis to 0.21 eV and 0.33 eV, respectively, contributing to the enhanced catalytic activity. The present study presents new strategies for developing efficient antioxidant organosulfur hydrolyzers and other practical industries.

The effect of cellulose on the combustion characteristics of coal slime: TG-FTIR, principal component analysis, and 2D-COS

Zhanshi Ni,Zhihui Song,Haobo Bi,Chunlong Jiang,Hao Sun,Zhicong Qiu,Liqun He,Qizhao Lin

Facing the severe environmental and energy crisis, how to use solid waste cleanly and efficiently is imminent. In this study, coal slime and cellulose are used for co-combustion experiments. Coal slime and cellulose are tested at mass ratios of 10:0, 9:1, 7:3, 5:5, 3:7, 1:9, and 0:10. When 10 % cellulose is added to the coal slime, the ignition temperature decreases by 169.3 °C, and the ignition characteristic index increased by 2.9 times. The addition of cellulose makes the comprehensive combustion performance of the sample increase exponentially. By analyzing the dominant reaction in the co-combustion process of coal slime and cellulose, the variance contribution rates of the first principal component and the second principal component are 67.84 and 29.18 %, respectively. Co-combustion of coal slime and cellulose enhances the release and combustion of early volatiles. In addition, the evolution law of gaseous products and the temperature dependence of gaseous products in the co-combustion process of coal slime and cellulose are analyzed by fourier transform infrared spectroscopy and two-dimensional correlation spectroscopy, respectively. This study provides a theoretical basis for the large-scale application of co-combustion of coal slime and biomass.

Sulfonamide modified chitosan oligosaccharide with high nematicidal activity against Meloidogyne incognita

Zhaoqian Fan,Kun Gao,Linsong Wang,Yukun Qin,Song Liu,Ronge Xing,Huahua Yu,Kecheng Li,Pengcheng Li

Chitosan oligosaccharide (COS) modification is a feasible way to develop novel green nematicides. This study involved the synthesis of various COS sulfonamide derivatives via hydroxylated protection and deprotection, which were then characterized using NMR, FTIR, MS, elemental analysis, XRD, and TG/DTG. In vitro experiments found that COS-alkyl sulfonamide derivatives ( S6 and S11 – S13 ) exhibited high mortality (>98 % at 1 mg/mL) against Meloidogyne incognita second-instar larvaes (J2s) among the derivatives. S6 can cause vacuole-like structures in the middle and tail regions of the nematode body and effectively inhibit egg hatching. In vivo tests have found that S6 has well control effects and low plant toxicity. Additionally, the structure-activity studies revealed that S6 with a high degree of substitution, a low molecular weight, and a sulfonyl bond on the amino group of the COS backbone exhibited increased nematicidal activity. The sulfonamide group is a potential active group for developing COS-based nematicides.

Dual-mode SERS/colorimetric sensing of xanthine in fish and shrimp based on peroxidase like activity multifunctional CoS@au nanoflower

Ruxi Lin,Rui Tan,Tao Yang,Qun Zhou,Juan Mu,Yan Zhao,Guoqi Zhang,Xiaojun Luo

Xanthine (XOE) is an important indicator for evaluating the freshness of aquatic products. This study successfully synthesized three-dimensional cobalt sulfide nanoflowers loaded with gold nanoparticles (CoS@Au). This material innovatively constructs an enzyme nanoflower cascade sensing system and integrates peroxidase like catalytic activity with surface enhanced Raman spectroscopy (SERS) enhancement capability on the same platform. In the presence of hydrogen peroxid (H 2 O 2 ), CoS@Au It can catalyze the oxidation of 3,3′, 5,5′-tetramethylbenzidine (TMB) to generate oxTMB, while producing significant color changes, strong UV–vis absorption, and Raman signals. This study presents a dual-mode sensor that effectively integrates the intuitive simplicity of colorimetry with the high sensitivity of SERS. This design overcomes the limitations of single-mode methods, such as restricted detection sensitivity and susceptibility to interference, by enabling cross-validation between the two modes. The constructed SERS/colorimetric platform achieves a detection limit of 9.69 × 10 −11  mol/L for XOE, thereby realizing ultrasensitive detection and visual analysis of analytes in shrimp and fish food samples. These results demonstrate its strong application potential in complex practical applications.

Synergistic removal of CO2, H2S and COS from blast furnace gas with a sulfolane-based biphasic absorbent: performance and mechanism

Jian He,Menghan Lu,Xinggang Wu,Haobo Gou,Ning Zhang,Zhiqiang Xu

The steel industry faces the dual pressures of carbon reduction and ultra-low emissions throughout production, making integrated CO2 capture and deep desulfurization of blast furnace gas essential. Conventional alcohol amine-based scrubbing agents have limitations such as low absorption capacity, regeneration difficulties, and high corrosivity. To address these issues, a CO2, COS (carbon oxysulfide), and H2S integrated high-efficiency removal biphasic absorbent was developed. The novel biphasic absorbent composed of sulfolane (SF), diethanolamine (DEA), 2-amino-2-methyl-1-propanol (AMP), piperazine (PZ), and H2O, achieved a removal rate of over 90% for CO2, COS, and H2S, under the tested conditions, while exhibiting low rich-phase viscosity and acceptable anti-corrosion performance. Optimal regeneration was attained at 110–120 °C, with regeneration efficiencies exceeding 85% and an estimated energy consumption of approximately 2.51 GJ per ton CO2 (about 33.9% lower than 30 wt% MEA), while exhibiting stable cyclic regeneration. Spectroscopic analyses (FTIR, 1H/13C NMR) indicate that H2S undergoes proton transfer to amine sites to form bisulfide containing quaternary ammonium salts, whereas CO2 and COS react with amine functionalities to yield carbamate and thiocarbamate species that preferentially partition into the aqueous-rich phase; sulfolane remains in the organic phase, enabling liquid–liquid separation. This research provides a promising basis for simultaneous pollution control and CO2 mitigation in the steel sector, aligning ultra-low emission targets with decarbonization efforts and offering potential environmental and economic benefits.

In situ synthesis of Ti3C2Tx MXene/CoS nanocomposite as high performance counter electrode materials for quantum dot-sensitized solar cells

Xiaobo Chen,Yefei Zhuang,Qingyu Shen,Xiaoyu Cao,Wen Yang,Peizhi Yang

Low electrocatalytic activity and/or high charge transfer resistance of counter electrodes (CEs) in quantum-dot-sensitized solar cells (QDSSCs) are the main reasons for the low photovoltaic performance . Herein, the CoS nanoparticles are anchored on the MXene (Ti 3 C 2 T x ) via a simple in-situ hydrothermal reaction process. It is the first attempt to use the MXene/CoS as a highly electrocatalytic CE for QDSSCs . The QDSSCs with a MXene/CoS CE shows a significant enhancement in cell performances and yields a promising power conversion efficiency (PCE) of 8.09% compared with that of the QDSSCs with bare CoS (5.77%) and bare MXene (4.25%) CEs. The significant enhancement of PCE value is mainly attributed to the synergistic effects of the unique layered morphology of conductive MXene nanosheets and its cocatalysis with CoS nanoparticles. The coupling of layered MXene with small CoS nanoparticles (~15 nm) provides abundant catalytic active sites. The improved mesoporous morphology contributes a high specific surface area and fast electron transfer channels for S x 2− reduction. Consequently, the MXene/CoS nanocomposite can be utilized as an effective agent to boost up the photovoltaic performance of QDSSCs.

Metal–organic framework – derived Co9S8@CoS@CoO@C nanoparticles as efficient electro- and photo-catalysts for the oxygen evolution reaction

Jiying Long,Yun Gong,Jianhua Lin

Through an annealing method, Co9S8@CoS@CoO@C nanoparticles (NPs) of 5–20 nm size were synthesized using a metal–organic framework (MOF) as the precursor. The Co9S8@CoS@CoO@C NPs exhibited excellent electrocatalytic activity for the oxygen evolution reaction (OER) with a lower overpotential than RuO2 (0.37 V) and Pt NPs (0.60 V). The better electrocatalytic activity of the hybrid material is associated with its heterojunction structure, in which the strong electron coupling interactions between Co9S8, CoS, CoO and C give rise to a superior synergistic effect. The interconnected amorphous carbon not only anchored the active Co compounds to avoid aggregation, but also afforded conducting channels for electron transfer. Furthermore, the cobalt compounds were the active species in the sample during the OER process; they were converted into CoOOH and Co(OH)2 in the KOH electrolyte, and the S elements in the sample entered the solution. The Co9S8@CoS@CoO@C NPs can exhibit the best OER activity with minimum overpotential (0.028 V) to afford a stable OER current after activation in a KOH aqueous solution. The sample also showed obvious photoresponse to visible light irradiation with enhanced OER current and lowered onset potential, which was probably associated with the semiconducting characteristics of the spin-polarized CoO and the quantum confinement effect of the nanoparticles.

Cascade-Targeting of Charge-Reversal and Disulfide Bonds Shielding for Efficient DOX Delivery of Multistage Sensitive MSNs-COS-SS-CMC

Lan Cui,Wentao Liu,Hao Liu,Qian Qin,Shuangxia Wu,Suqin He,Zhenya Zhang,Xinchang Pang,Chengshen Zhu

ZIF-67-derived hollow CoS and Mn0·2Cd0·8S to form a type-II heterojunction for boosting photocatalytic hydrogen evolution

Mengting Shen,Liwei Lin,Yanan Wang,Qian Liang,Man Zhou,Zhongyu Li,Song Xu

Photocatalytic hydrogen production technology is an effective method for solving environmental pollution problems and obtaining renewable energy. In order to improve the efficiency of hydrogen production , the development of new photocatalysts with high activity and stability remains a great challenge. In this work, we report the formation of CoS/Mn 0·2 Cd 0·8 S heterostructures by combining ZIF-67-derived CoS with Mn 0·2 Cd 0·8 S using a template method and exhibiting excellent photocatalytic hydrogen production performance. Systematic studies have shown that the CoS/Mn 0·2 Cd 0·8 S heterostructure has a strong light-trapping ability, which enhances charge separation and transfer due to its abundant reactive sites and heterostructure. The photocatalytic hydrogen production rate under visible light conditions was 43.7 mmol g −1  h −1 , which was 43.7 and 14.1 times higher than that of pure CoS and pure Mn 0·2 Cd 0·8 S, respectively. Importantly, the photocatalytic performance remained essentially unchanged after four cycles. In addition, the internal space of CoS/Mn 0·2 Cd 0·8 S can be effectively utilized to provide abundant reaction sites, which further promotes the photocatalytic hydrogen production.

Encapsulation of fucoxanthin in pickering emulsion with improved stability and bioaccessibility for inflammatory bowel disease prevention

Bowen Jiao,Nanting Zhu,Decheng Bi,Lijun Yao,Yan Wu,Beiwei Zhu,Xu Xu

Fucoxanthin (FUC), a lipid-soluble carotenoid with various bioactivities, demonstrates promise as a preventive agent against inflammatory bowel disease (IBD). Nevertheless, the inherent instability and low aqueous solubility of FUC limit its application in functional food formulations and pharmaceutical applications. In this study, a FUC-loaded pickering emulsion (G-SPI-COS/FUC emulsion) with high encapsulation efficiency and small particle size was developed by using genipin-crosslinked soy protein isolate (SPI)-chitooligosaccharide (COS) nanoparticles as stabilizers. G-SPI-COS/FUC emulsion exhibited excellent stability under varying pH values, ionic strengths, and storage conditions. In vitro digestion experiments showed that G-SPI-COS/FUC emulsion controlled FUC release and enhanced its intestinal absorption and bioavailability. Furthermore, G-SPI-COS/FUC emulsion was more effective in preventing dextran sulfate sodium (DSS)-induced colitis than free FUC and FUC-loaded pickering emulsion stabilized by native SPI. These findings indicated that G-SPI-COS/FUC emulsion could serve as a promising delivery system for FUC, providing a novel approach to the prevention of IBD.

Three-dimensional porous reduced graphene oxide/sphere-like CoS hierarchical architecture composite as efficient counter electrodes for dye-sensitized solar cells

Lijuan Sun,Lei Lu,Yu Bai,Kening Sun

In the current study，three-dimensional porous architectures (CSHPS-G) based on reduced graphene oxide (RGO) and CoS hierarchical sphere (CSHPS) are reported. A facile hydrothermal method is used to synthesize such three-dimensional architecture. When the resulting CSHPS-G is evaluated as counter electrode of dye-sensitized solar cells, it delivers an excellent electrochemical activity toward the reduction of I 3 − , which is resulted from the synergetic effect between CoS hierarchical architecture and RGO. Consequently, the device based on CSHPS-G electrode showing a better photovoltaic performance than that of the Pt electrode .