ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Sheng Li,Wentong Fan,Qiulin Chen,Xinfeng Zhang
Sulfur quantum dots (SQDs) are emerging fluorescent nanomaterials, whereas most of the methods for synthesizing SQDs are limited to thermal synthesis. In this study, we report the first case of a light-driven strategy for facile synthesis of SQDs and further applied the SQDs for fluorescence cell imaging. The light-driven synthesis strategy only utilized Na2S as the sulfur source and nano-TiO2 as the photosensitizer. Under ultraviolet illumination, the nano-TiO2 photosensitizer generated a large number of •O2– and •OH to oxidize S2– to Sx2– and further to elemental sulfur, which could be obtained as monodispersed SQDs after etching by H2O2. The prepared SQDs exhibit excellent tunable photoluminescence properties, superior stability, and a uniform small size, with particle diameters in the range of 0.5–4 nm, and the fluorescence absolute quantum yield is as high as 27.8%. Meanwhile, the prepared SQDs also exhibited extreme biocompatibility and stability, and we further applied it for intracellular imaging and Hg2+ sensing with satisfactory results. In comparison to the widely reported thermal synthesis, the light-driven synthesis method is greener and simpler, opening a new way for the preparation of biocompatible SQDs.
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Science Advances
·
2025
·Vol. 11
·期 10
·
IF 12.5
Zhongliang Huang,Qi Xiao,Tianyi Ding,Jing Xia,Changhong Zhan,Xiangmin Meng,Chih-Wen Pao,Zhiwei Hu,Wei-Hsiang Huang,Yingru Wang,Nanjun Chen,Liang Cao,Xiaoqing Huang
Platinum (Pt) has been documented as the top-tier fuel cell catalyst, yet it faces a notable challenge regarding its poor CO tolerance and sluggish oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs), particularly when using CO-contaminated blue and gray H2. Here, we present an interfacial metal coordination strategy to design a bifunctional platinum-cobalt (PtCo) intermetallic catalyst integrated with a tin-nitrogen-carbon (Sn–N–C) support, which forms Pt–Sn–N bonds that substantially boost both ORR activity and CO tolerance. The PtCo/Sn–N–C-made fuel cell achieves a topmost peak power density of 2.11 watts per square centimeter in 100 parts per million (ppm) of CO-containing H2, surpassing all previously reported PEMFCs. In addition, it operates stably at a rated voltage for over 710 hours in 100 ppm of CO/H2-air. This work demonstrates the feasibility of fuel cells directly using CO-contaminated gray & blue H2, paving the way for PEMFC-driven energy vehicles.
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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2018
·Vol. 71
·期 5
·1113-1126
·
IF 0.91
Chen Jin-ping,Zhang Xue-song
Four hydrosoluble macroazacyclic compounds, phosphorus phthalocyanine and substituent phosphorus triaza tetrabenzo corrole substituted with amino or sulfonate groups respectively, were investigated as corrosion inhibitors for mild steel in 1 mol/L HCl. The results obtained from weight loss test showed that the inhibitive efficiency of phosphorus phthalocyanine was higher than the phosphorus triaza tetrabenzo corrole; while the amino substituent phosphorus phthalocyanine showed the strongest inhibitive ability among them. The potentiodynamic tests illustrated that these inhibitors protected steel according to the mixed type mechanism on electrochemistry; while the impedance spectra revealed the increasing of charge transfer resistance and the decreasing of double layer capacitor caused by the adsorption of inhibitors. The surface analysis (XPS and SEM) proved the protection of steel surface by the adsorbed inhibitors. The molecular dynamic simulation indicated the advantages of phosphorus phthalocyanine as inhibitors associating with highly binding stability and stable adsorption configuration. The unique degradation properties of these inhibitors under visible light made them useful with environmental advantage in application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yangke Long,Guicong Xiao,Jian Dai,Yanyun Chen,Hua-Yue Zhu,Dan Peng,Huosheng Li
Emerging single-atom materials and metal sulfides hold significant promise as alternatives to precious metal catalysts for nitroaromatics conversion; however, their intrinsic activity and durability remain insufficiently understood. Herein, sulfur and nitrogen co-doped carbon matrices incorporating CoS nanoparticles and single-atom Co with Co–N 4 –S 1 coordination were constructed through a facile pyrolysis approach. Advanced characterization techniques, such as X-ray absorption fine structure (XAFS) and aberration-corrected electron microscopy, unveiled unique structural features underpinning exceptional catalytic efficiency and recyclability. The catalyst achieved a specific catalytic rate of 134 min −1 g −1 L for p -nitrophenol (PNP) hydrogenation, outperforming many noble metal-based catalysts. Experimental and theoretical analyses identified the Co–N 4 –S 1 single-atom moiety as the primary active site, demonstrating remarkable structural stability. Axial sulfur coordination was found to fine-tune the electronic state of the central Co atom, mitigating the overbinding of reaction intermediates and enhancing PNP conversion efficiency. In contrast, CoS nanoparticles exhibited limited recyclability, with agglomeration, cobalt hydroxide formation, and dissolution observed during repeated use. This study presents a highly efficient catalyst for nitroaromatics conversion and provides a foundational framework for understanding the durability and mechanistic roles of cobalt-based active sites.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shanlei Chang,Kai Rong,Yuchen Wang,Zhixuan Yu,Junfeng Zhai,Hongwei Tian,Youxing Fang,Shaojun Dong
Specific applications of gels can raise multiple demands, including low cost, elasticity, adaptability to wide temperature ranges, conductivity, and reduced hazards, thereby presenting diverse challenges for one material. Deep eutectic solvents (DESs) offer unexpected solutions to tackling the challenging task. Here, we mixed anhydrous diallyldimethylammonium chloride (DMDAAC) and urea to synthesize a polymerizable DES with a wide range of solubility. It can polymerize to form versatile DES gel upon photoinitiation. The gel exhibited high transparency (∼94 %), a wide range of temperature tolerance (−40 ∼ 100 °C), outstanding elastic properties (ε > 2400 %), good conductivity (0.05 mS·cm −1 ) and self-healing capability. The pristine gel film was successfully applied to motion sensors, while the DES gel with lignin was also employed as an elastic anti-UV film. Moreover, its water-solubility and non-hazardous compositions suggest the minimize environmental impact of the DES gel. This polymerizable DES can not only boost the development of electronic devices like motion sensors, but also inspire more creative ideas in promising applications of DESs and DES gels.
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DALTON TRANSACTIONS
·
2024
·
IF 3.5
Xiaoyu Chu,Xinrui Wang,Shuo Tian,Yongkuo Zhao,Shikai Liu,Hong Yan,Yan Shang
Modulating the photogenerated electrons of CeO2 to activate O2 and efficiently photocatalytic degradation of chlorophenols is a highly desired goal. Herein, we have successfully fabricated FePc/CeO2 heterojunction through H-bond induced assembly. The photocatalytic degradation of 2, 4-DCP by the amount-optimized FePc/CeO2 nanocomposite was improved by 3 times compared with pure CeO2. By means of electron paramagnetic resonance (EPR) and single wavelength photocurrent spectroscopy, it is confirmed that the excellent photocatalytic performance is mainly attributed to the formation of Z-scheme heterojunction, which promotes charge separation and transfer, and the introduction of FePc broadens the visible light absorption range of heterojunction. Moreover, O2 temperature-programmed-desorbed curves and electrochemical O2 reduction measurements results demonstrate that the single Fe-N4(II) site in FePc is more conducive to promoting O2 activation than that of other metal phthalocyanines. Based on in situ FT-IR and liquid chromatography-tandem mass spectrometry (LC-MS), a possible reaction pathway of 2, 4-DCP degradation was proposed. This study provides a novel strategy to prepare CeO2 based Z-scheme heterojunctions with abundant monoatomic sites for pollutant degradation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weiting Yu,Zhe Yang,Rendan Zhu,Mengzhi Lu,Tingjiang Lu,Yan Yu,Shuang Song
The photo-assisted electrochemical CO 2 reduction reaction (CO 2 RR) toward CO stands as a highly promising pathway for addressing environmental challenges and produces valuable chemicals. In this study, a novel pl-Si/Ag/Pc electrode was developed with the surface enveloped by an amorphous phthalocyanine overlayer. The pl-Si/Ag/Pc electrode has gained recognition as a catalyst of exceptional quality, displaying superior activity, selectivity toward CO, and stability. A synergistic mechanism has been revealed from experimental results that Ag served as active centers for CO 2 RR, Pc facilitated CO 2 adsorption and suppressed the competing HER reaction. Functionalizing the surface of electrode with Pc enhanced the CO selectivity (FE CO at 90.8 % under −1.5 V vs RHE) during the CO 2 RR process and reduced the cost in following product separation procedures. This study presents an uncomplicated yet effective approach for formulating durable and discerning electrocatalysts dedicated to the utilization of CO 2 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yifan Zhang,Sylvestre Ndayiragije,Ming Chen,Xiaobo Wang,Lihua Zhu,Nan Wang
Fe- and nitrogen-doped carbonaceous (Fe-N-C) sites supported on MnO 2 (Fe-N-C@MnO 2 ) were prepared by a solvent-free mechanochemical method for peroxymonosulfate (PMS) activation to degrade norfloxacin (NFX). After a 50-min ball milling of iron(II) phthalocyanine (Fe( II )Pc) and MnO 2 at a weight ratio of 7.5 %, the obtained Fe-N-C@MnO 2 exhibited exceptional activity in PMS activation, achieving nearly complete degradation of NFX in 5 min with a rate constant of 0.62 min −1 . This rate constant was 11.5 and 28.2 times higher than that for milled MnO 2 (bm-MnO 2 ) and the mixture of Fe( II )Pc and MnO 2 , respectively. Alternative iron sources (FeSO 4 , FeCl 2 , Fe(III)-EDTA) and phthalocyanine showed no enhancement. Characterization revealed Fe-N-C@MnO 2 possessed abundant Mn 3+ , oxygen vacancies and Fe-N-C sites. Combined experimental and computational studies demonstrated Fe-N-C@MnO 2 simultaneously enhanced the 1 O 2 generation and facilitated the formation of SO 4 •− , •OH and O 2 •− , with contributions to NFX degradation following: 1 O 2 > •OH ≈ O 2 •− > SO 4 •− . This work establishes mechanochemical coordination engineering as a facile strategy for constructing high-performance metal-N-C hybrid catalysts.
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