MOLECULES
·
2025
·Vol. 30
·期 22
·4368
·
IF 4.6
Shanhao He,Li Liu,Min Liu,Jinjun Tian,Yan Xue,Keliang Wu
To address the challenges of low solar energy utilization efficiency and rapid recombination of photogenerated charge carriers in photocatalytic hydrogen evolution, this study successfully constructed a composite photocatalyst of ZnIn2S4(ZIS) supported on N-doped hollow carbon spheres (N-HCS), denoted as ZIS/N-HCS, via a combination of template etching and in situ growth strategies. Characterization results demonstrate that this hollow structure possesses a high specific surface area (48.41 m2/g) and a narrowed bandgap (2.41 eV), achieve broad-spectrum light absorption, thereby enabling the catalyst to generate a local hot spot temperature of 136 °C under AM1.5G conditions. The optimized ZIS/N-HCS-0.30 sample exhibited a significantly enhanced photocurrent response (8.26 μA cm−2) and improved charge separation efficiency. When evaluated at a set solution temperature of 20 °C, the material exhibited a photocatalytic hydrogen evolution rate of 17.03 mmol g−1·h−1, which is 7.06 times higher than that of pure ZIS. Furthermore, it demonstrated excellent cycling stability. This work elucidates the synergistic role of the hollow photothermal structure in enhancing solar energy utilization and catalytic reaction kinetics, providing a new strategy for designing efficient solar-driven hydrogen production systems.
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Korean Journal of Materials Research
·
2025
·Vol. 35
·期 8
·352-365
·
IF 0.3
Haixia Wang,Yilei Sun,Yao Liu,Kunjie Li,Zeda Meng,Won-Chun Oh
The catalyst materials 0N-Cu-MOF, 1N-Cu-MOF, and 2N-Cu-MOF were successfully synthesized usinga solvothermal method, and using different concentrations of nitrogen-modified Cu organic frameworks (xN-Cu-MOF). Characterizations using X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) surface area analysis showed that 1N-Cu-MOF had the largest SSA and pore size among the three materials synthesized. 1N-Cu-MOF exhibited the largest pore size and specific surface area among the three materials, which had a decisive effect on CO2 reduction. In addition, stability and CO2 reduction reaction (CO2RR) activity were evaluated by linear sweep voltmeter, cyclic voltmeter, electrochemical impedance spectroscopy, and time flow tests. Faradaic efficiency (FE) was determined by product analysis. Among the three catalyst materials, 1N-Cu-MOF showed the best catalytic performance at 50 mA·cm-2 (maximum current density). The charge transfer resistance was 8.23 Ω, the average current density was 19.9 mA·cm-2, and the FE of methane (CH4) production showed a high efficiency of 70.45 % when tested for 12 h at an overpotential of -0.35 V (to-RHE).
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xinyue Wang,Li Liu,Binbin Jiang,Weiwei Xie,Qingyang Chong,Song Li,Zhiming Chen
The rapid and sensitive detection of hazardous substances is essential for safeguarding human health. This work presented the synthesis of laccase immobilized on N-doped carbon nanonets (N-doped carbon nanonets-lac) biosensor and its application for the photothermal detection of hydroquinone. The N-doped carbon nanonets-lac biosensor demonstrated rapid response and precise detection of hydroquinone in 5 s, along with excellent sensitivity, good tolerance to metal ions and organic compounds, outstanding selectivity, and storage stability. Thanks to the photothermal effect of N-doped carbon nanonets, the N-doped carbon nanonets-lac biosensor was demonstrated as a photothermal biosensor for hydroquinone detection. The N-doped carbon nanonets-lac biosensor exhibits a highly sensitive current response under illumination, with a detection limit as low as 0.14 μM (S/N = 3) and an extensive response range of 1–1000 μM. Furthermore, the N-doped carbon nanonets-lac biosensor showed reliable performance in photothermal analysis of tap and Yangtze River water samples, highlighting its technical effectiveness in detecting contamination of toxic compounds in real water samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Tingyuan Zhang,Lingxiao Song,Jiahui Yang,Jiajia Wang,Dong Feng,Baojun Ma
Heteroatom doping is a promising strategy for optimizing the photocatalytic activity of semiconductors. However, relying solely on single-element doping often poses challenges in modulating the capabilities of semiconductors. Herein, we adopt a strategy of simultaneously modifying ZnIn 2 S 4 with the double non-metallic elements nitrogen (N) and oxygen (O) to form (N, O)-ZnIn 2 S 4 . Interestingly, (N, O)-ZnIn 2 S 4 exhibits significantly higher hydrophilicity and specific surface area compared to pristine ZnIn 2 S 4 . The contact angle decreases from 24° to 21°, while the specific surface area increases from 56 m 2 /g to 75 m 2 /g. The hydrogen production rate of (N, O)-ZnIn 2 S 4 reaches 400 μmol/h/g, which is 2.52 times higher than that of pristine ZnIn 2 S 4 . Photoelectrochemical characterization reveals that (N, O)-ZnIn 2 S 4 has a lower overpotential, higher photocurrent, lower resistance, reduced fluorescence intensity, and shorter fluorescence lifetime. Additionally, co-catalyst loading boosts the hydrogen production activity of ZnCo 2 S 4 /(N, O)-ZnIn 2 S 4 from 548 μmol/h/g to 810 μmol/h/g, compared to ZnCo 2 S 4 /ZnIn 2 S 4 . This study presents a dual non-metallic modification strategy to enhance semiconductor properties, achieving superior performance in photocatalytic hydrogen production.
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PubMed
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Haoran Sun,Wanzhong Yin,Bin Yang,Keqiang Chen,Qiuyue Sheng
The flotation performances of magnesite and quartz were investigated in this work using N-hexadecyltrimethylammonium chloride (HTAC) as a collector. Micro-flotation tests were performed in a pilot study, and the results demonstrated that HTAC had high selective collection ability to quartz. Further, batch flotation results showed that HTAC could effectively remove quartz from magnesium-bearing carbonate ores. The adsorption behaviors of HTAC onto the surfaces of two minerals were analyzed through zeta-potential measurements and X-ray photoelectron spectroscopy (XPS) detection, which revealed that HTAC was mainly adsorbed on quartz rather than magnesite. Thus, HTAC could be used as a high-selectivity collector to efficiently separate magnesite from quartz.
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LANGMUIR
·
2021
·
IF 3.882
Aling Chen,Qingfeng Yi,Kuang Sheng,Yuebing Wang,Jiangchuan Chen,Qiaoli Zhang,Kaiwen Xiang,Guanghua Tan
Development of high-efficiency oxygen reduction reaction (ORR) catalysts under neutral conditions has made little research progress. In this work, we synthesized a three-dimensional porous N/P codoped carbon nanosheet composites (CNP@PNS) by high-temperature thermal treatment of dicyandiamide, starch, and triphenylphosphine and subsequent porous structure-making treatment using the NaCl molten salt template. In the neutral solution, the electrocatalytic performance of the CNP@PNS-4 catalyst exhibits an onset potential of 0.98 V (vs reversible hydrogen electrode) and a half-wave potential of 0.91 V for ORR, which greatly surpasses commercial Pt/C (40%). Three kinds of neutral metal–air batteries (Zn–air, Al–air, and Fe–air) using the prepared samples as cathodic catalysts were constructed, corresponding to the maximum power density of 120.2, 78.3, and 18.9 mW·cm–2, respectively. Also, they reveal outstanding discharge stability under different current densities. The density functional theory calculation depicts the reduction of the free energy of the determining step and subsequent decline of the overpotential for ORR.
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HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Shuo Yan,Haibin Yu,Zan Chen
Membranes with both good permeation and selectivity are highly desired for gas separations. In this study, we synthesized a new 6FDA-type polyimide copolymer 6FDA-BDTA-ODA, and then an organic polymer of poly (N-vinylimidazole) was doped into the polyimide to prepare mixed matrix membranes (MMMs). We also studied the effect of poly (N-vinylimidazole) contents on the separation performance of MMMs. The results showed that the ideal selectivity for CO2/CH4 was improved by adding the poly (N-vinylimidazole) filler. The ideal selectivity reached 63.5 with 6 wt% poly (N-vinylimidazole) loading with the permeability of 29.2 Barrer. The highly permeable MMMs showed a considerably enhanced performance for CO2/CH4 that close to the 2008 Robeson upper-bound. The gas separation performance of the prepared MMMs for CO2/CH4 was improved compared to that of the pure polymer membrane, indicating that the copolyimide/poly (N-vinylimidazole) MMMs have promising applications in CO2/CH4 gas separation.
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Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Zifei Yan,Grace Dai Zhen Lee,Jian Deng,Guangsheng Luo
The synthesis of terminal epoxides, which are vital components in pharmaceuticals and resins, often involves dehydrochlorination of β-chlorohydrins. Although intrinsic kinetics indicate that the dehydrochlorination reaction in the presence of sodium hydroxide could be very rapid, the practical implementation could always be hindered by long reaction time and low conversion rate. Extended contact between the product and the alkaline solution can lead to hydrolysis of the epoxy group, thus necessitating the process intensification to realize higher production efficiency and selectivity. Here, by characterizing thermodynamic equilibrium data and in-situ recording of the reaction that proceeded in a constant interphase reactor, the heterogeneous dehydrochlorination is demonstrated to occur primarily in the organic phase, and the overall reaction rate depends on the equilibrium concentration of sodium alkoxides. This finding, which is fundamentally different from the traditional view that chlorohydrin is first dissolved in the aqueous phase and then reacts with NaOH, leads us to use inert alcohols to assist in the extraction of NaOH. Based on this method, the reaction time can be reduced over 80 % both in batch and continuous reactors. Besides, the method is demonstrated to be effective in the dehydrochlorination of five different long-chain β-chlorohydrins.
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NANOTECHNOLOGY
·
2023
·Vol. 35
·期 6
·065704
·
IF 3.5
Xiaomei Yu,Wei Shi,Jiajiao Wei,Tiantian Liu,Yuanyuan Li,Mengyuan He,Zhengyu Wei,Dehai Ping,Panfei Sun,Jin You Zheng,Songjie Li
Developing non-noble-metal electrocatalysts for hydrogen evolution reactions with high activity and stability is the key issue in green hydrogen generation based on electrolytic water splitting. It has been recognized that the stacking of large CoP particles limits the intrinsic activity of as-synthesized CoP catalyst for hydrogen evolution reaction. In the present study, N-MoxC/CoP-0.5 with excellent electrocatalytic activity for hydrogen evolution reaction was prepared using N-MoxC as decoration. A reasonable overpotential of 106 mV (at 10 mA cm−2) and a Tafel slope of 59 mV dec−1 in 1.0 M KOH solution was achieved with N-MoxC/CoP-0.5 electrocatalyst, which exhibits superior activity even after working for 37 h. Uniformly distributed ultrafine nanoclusters of the N-MoxC/CoP-0.5 hybrids could provide sufficient interfaces for enhanced charge transfer. The effective capacity of the hydrogen evolution reaction could be preserved in the complex, and the enlarged electrocatalytic surface area could be expected to offer more active sites for the reaction.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4608-4618
·
IF 1.556
Cui Qinmin,Zhu Shudi,Yan Yingjie,Ye Quanlin,Ziener Ulrich,Cao Zhihai
In the present study, superparamagnetic Fe3O4/poly(N-isopropyl acrylamide) nanocomposites were synthesized by one-step inverse miniemulsion copolymerization of N-isopropyl acrylamide and N,N'-methylene diacrylamide. The loading of Fe3O4 nanoparticles
in the nanocomposites was 27 wt%, and the saturation moment of the nanocomposites was 12.4 emu · g−1. Fe3O4 nanoparticles were prepared through a coprecipitation method. The amount of stabilizer (poly(acrylic acid)) significantly influenced the
size and size distribution of the Fe3O4 nanoparticles, and, therefore, their magnetic properties. Superparamagnetism of the Fe3O4 nanoparticles was preserved in the nanocomposites. The effects of synthetic parameters on the particle properties, namely
surfactant loading, concentration of ferrofluid, type of lipophobe and initiator, and amount of cross-linker were investigated. Nanocomposites of Fe3O4/poly(N-isopropyl acrylamide) displayed a guava-like morphology, which they could retain after being redispersed
in polar solvents.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Liang Zhang,Xinyue Wang,Tingting Zhang,Chengzhan Liu,Dehua Li,Shuangxi Xing
Taking full advantage of both silver and nitrogen-doped carbon (N-C) with finely designed nanostructure is a great challenge in achieving excellent electrocatalysts for oxygen reduction reaction (ORR). The Janus nanostructure composed of Ag nanoparticles (NPs) and N-C with individual exposed surface meets this purpose quite well. This can be achieved via pyrolyzing the core-shell Ag@polypyrrole (Ag@PPy) with eccentric encapsulated structure, where the AgNPs locate away from the center of the PPy spheres. The as-synthesized Janus nanostructured Ag@N-C demonstrates comparable ORR activity to commercial Pt/C catalyst with an onset and half-wave potential of 0.955 V and 0.821 V vs. RHE, respectively, and a limited current density of 4.976 mA cm −2 at 0.365 V, and it also illustrates better stability and stronger methanol tolerance. The excellent ORR activity is largely attributed to the synergistic effect originating from the interaction between AgNPs and carbonized PPy half-shell, where the former one leads to a higher disordered degree in the carbon layer and the latter results in the positive shift of Ag 3 d binding energy to facilitate the active oxygen adsorption and keeps the AgNPs from aggregation to avoid activity losing.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Yu Lu,Lujia Sun,Cheng Li,Xiaoqin Wang,Wenqing Li,Tong Zhao,Linjuan Huang,Zhongfu Wang
Extensive cross-allergic reactivity exists among food-borne plants. As most allergens are glycoproteins, protein sensitization has been extensively studied. However, little attention has been given to the glycan component of glycoproteins. Here, we qualitatively and quantitatively compared the N -glycans of eight cross-reactive plant glycoproteins derived from peach pollen, soy, pine nut, cashew nut, pistachio, walnut, almond, and hazelnut. Cross-reactive carbohydrate determinants (CCDs) were widely present in the allergic glycoproteins according to the following order: pollen > soybean > pistachios > pine nuts > walnuts > cashews > hazelnuts > almonds. The N -glycan structure presented clear differences between the germplasm and vegetative tissue. Importantly, fucosylation and xylosylation levels correlated positively with extensive cross-reactivity between plants, which suggests that CCDs may be one of the causes of cross-allergy. This result provides the foundation for mechanistic studies on plant-derived CCDs as a source of food cross-allergies.
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