CARBON
·
2015
·
IF 6.196
Jiangru Zhang,Xiang Wang,Guicun Qi,Binghai Li,Zhihai Song,Haibin Jiang,Xiaohong Zhang,Jinliang Qiao
A novel carbon microspheres composed of N-doped hollow carbon nanospheres was prepared by a newly developed three-step method. Firstly, poly(styrene-co-butyl acrylate)/polypyrrole (PSBA/PPy) latex particles with core–shell structure were synthesized by the chemical oxidative polymerization of pyrrole in poly(styrene-co-butyl acrylate) (PSBA) emulsion, then PSBA/PPy core–shell latex was dried by spray drying process . Finally, the dried PSBA/PPy particles were pyrolyzed under nitrogen atmosphere at 500–800 °C without activation process . It was found that nitrogen content could reach 7.62 wt% and large amount of micro-, meso- and macro-pores existed in this kind of carbon microsphere. The application of this carbon microsphere in CO 2 capture was also explored.
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Light-Science & Applications
·
2015
·Vol. 4
·期 12
·e364
·
IF 14.603
Qu Dan,Zheng Min,Li Jing,Xie Zhigang,Sun Zaicheng
Unlike inorganic quantum dots, fluorescent graphene quantum dots (GQDs) display excitation-dependent multiple color emission. In this study, we report N-doped GQDs (N-GQDs) with tailored single color emission by tuning π -conjugation degree, which is comparable to the inorganic quantum dot. Starting from citric acid and diethylenetriamine, as prepared N-GQDs display blue, green, and yellow light emission by changing the reaction solvent from water, dimethylformamide (DMF), and solvent free. The X-ray photoelectron spectroscopy, ultraviolet-visible spectra results clearly show the N-GQDs with blue emission (N-GQDs-B) have relatively short effective conjugation length and more carboxyl group because H 2 O is a polar protic solvent, which tends to donate proton to the reagent to depress the H 2 O elimination reaction. On the other hand, the polar aprotic solvent (DMF) cannot donate hydrogen, the elimination of H 2 O is promoted and more nitrogen units enter GQD framework. With the increase of effective π -conjugation length and N content, the emission band of N-GQDS red-shifts to green and yellow. We also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.
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Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2978-2984
·
IF 0
Xiang-Jun Huang,Yi-Guo Tang,Long-Fei Yang,Ping Chen,Qing-Sheng Wu,Zhen Pan
An excellent CMK3/graphene-N-Co (CMK3/G-N-Co) catalytic system was firstly prepared by a simple procedure. It shows excellent catalytic ability in alkaline media for the oxygen reduction reaction (ORR) and the half-peak potential is only 27 mV less than that of the commercial 20% Pt/C catalyst. The product revealed superior stability and tolerance to methanol poisoning effects compared to the commercial 20% Pt/C catalyst. The excellent performance is probably attributed to the doping of the nitrogen and cobalt elements in the CMK3/G, formation of a three-dimensional nanoporous network structure by combining graphene with CMK3 and the promoted charge transfer across the carbon–Co interface and conductivity of the nanocomposite. Since graphene oxide (GO) and CMK3 are commercially available materials, the CMK3/G-N-Co catalytic system for the ORR is a promising alternative to Pt in the practical application of fuel cells. The product may also have potential applications in the fields of metal–air batteries, lithium-ion batteries, supercapacitors, sensors and so on.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Huiying Cheng,Jingchang Sun,Siwen Liu,Furong Cao,Liuting Shan,Zijiang Yang,Xiaofan Cui,Jiaxu Zhao,Zhen Qiao,Qiuju Feng
Low-grade heat (<100 °C) is abundant and ubiquitous in the environment, and the recovery of low-grade heat energy will be of great significance for the energy supply and the improvement of the environment. Low-cost and effective technologies for transforming low-grade heat into electricity are urgently needed. Thermocell (TEC) based on REDOX couples has become a promising technology for low-grade heat harvesting due to its advantages of low cost, scalability, and intrinsic high thermopower. To enhance its performance, different types of TECs need to incorporate various additives into the REDOX couples. However, there is currently no identical additive that effectively enhances the performance of both P-type and N-type TECs. In this paper, carboxylated chitosan is used as an identical additive, resulting in an increase in the Seebeck coefficient of P-type and N-type TECs by 115.33 % and 53.25 %, respectively. Furthermore, we introduce a novel sandwich-structured packing technique featuring a configuration of Metal/PET film/Carbon felt (MPC) for TEC. This approach effectively reduces both the cost and weight of the TEC, while the MPC structure further enhances their performance. The TEC can be scaled up to power electrical devices. Our achievement provides an effective strategy for harvesting low-grade heat energy.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xin Ye,Haodong Zhang,Fan Wu,He Ma,Shaoyang Wu,Xiangqun Zhuge,Yurong Ren,Peng Wei
Transition metal phosphides (TMPs) have drawn widespread attention as promising electrocatalysts due to their special electronic structure, good electrochemical activity, low cost, and high abundance. Although a great deal of effort has been expended in the pursuit of TMPs, the majority of synthesis processes are complex and hazardous due to the use of flammable and toxic phosphorus sources. Herein, we propose a nontoxic and scalable synthetic strategy for the synthesis of NiCoP@NC by using green and cheap diethylenetriaminepentakis (methylphosphonic acid) (DTPMP) as the phosphorus source. DTPMP can also act as a chelating agent and displays strong coordination ability with metal ions, thereby reducing particle size and forming nanoparticles. The NiCoP@NC exhibits outstanding stability and electrocatalytic activity in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Furthermore, water electrolysis performance also is measured using NiCoP@NC as both anode and cathode, which delivers a cell voltage of 1.73 V at 10 mA·cm–2 and can operate stably for 24 h. This work not only constructs efficient bifunctional catalysts, but also broadens the green synthesis method of nanosized TMPs, paving the way for further large-scale practical applications.
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高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yuwen Deng,Jijun Guo,Zaili Xiong,Wang Li,Changyang Wang,Meirong Zeng,Zhongyue Zhou,Long Zhao,Jiuzhong Yang,Wenhao Yuan,Fei Qi
The oxidation of pure n-butanal and the n-butanal/NO mixture was investigated in an atmospheric jet-stirred reactor at stoichiometric conditions and over the temperature range of 425–925 K. Mole fraction profiles of characteristic intermediates, like nitrogenous, carbonyl, and hydrocarbon intermediates were obtained using synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV–PIMS) via molecular beam sampling. A previous reported kinetic model of n-butanal oxidation was improved and a submechanism interpreting n-butanal/NOx interaction kinetics was developed and validated against experimental measurements. Results show that NO addition results in a featured temperature dependence of n-butanal reactivity similar to that of hydrocarbon fuels, i.e., inhibiting reactivity at low temperatures while promoting at intermediate temperatures. However, the presence of the n-butanal carbonyl group introduces distinct kinetic effects on this system compared to previously reported hydrocarbon/NO systems. Model analysis suggests a pronounced interaction between NO and the n-butanal carbonyl group, particularly at low temperatures where NO notably accelerates the removal of the carbonyl group, yielding large amounts of propyl radicals. This interaction results in the suppression of peroxy radical chemistry on the alkyl chain and chain-branching reactions of the propyl radical, thus decreasing the low-temperature reactivity of n-butanal. At intermediate temperatures, the influence of the carbonyl group on reactivity is not as pronounced and the increased reactivity primarily depends upon the impact of NOx on the active radical pool. For example, NOx-related chemistry accelerated the formation of OH radicals, thus facilitating fuel decomposition and the further conversion of CO to CO2. Besides, NO addition significantly affects the speciation of several products, such as methane, ethane, and formaldehyde, which was correlated to the additional competitive pathways introduced by NOx.
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高影响因子
LANGMUIR
·
2011
·
IF 4.269
Lijuan Shi,Na Li,Han Yan,Yan’an Gao,Liqiang Zheng
The aggregation behavior of three long-chain N-aryl imidazolium ionic liquids (ILs), 1-(2,4,6-trimethylphenyl)-3-alkylimidazolium bromide [Cnpim]Br (n = 10, 12, and 14), in aqueous solutions was systematically explored by surface tension, electrical conductivity, and 1H NMR. A lower critical micelle concentration (cmc) for the N-aryl imidazolium ILs is observed compared with that for 1,3-dialkylimidazolium ILs [Cnmim]Br, indicating that the incorporation of the 2,4,6-trimethylphenyl group into a headgroup favors micellization. The enhanced π−π interactions among the adjacent 2,4,6-trimethylphenyl groups weaken the steric hindrance of headgroups and thus lead to a dense arrangement of [Cnpim]Br molecules at the air−water interface. An analysis of the 1H NMR spectra revealed that the introduced 2,4,6-trimethylphenyl group may slightly bend into the hydrophobic regions upon micellization. The micelle formation process for [Cnpim]Br (n = 10, 12, and 14) was found to be enthalpy-driven in the investigated temperature range, which is attributed to the strong electrostatic self-repulsion of the headgroups and the counterions as well as the π−π interactions among headgroups. Strong, stable fluorescence properties are presented by the new N-aryl imidazolium ILs, indicating their potential application in the field of photochemistry.
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PubMed
高影响因子
Soft Matter
·
2011
·Vol. 7
·期 14
·6451-6456
·
IF 4.457
Shengtong Sun,Peiyi Wu
Near infrared spectroscopy in combination with two-dimensional correlation spectroscopy (2Dcos) and perturbation correlation moving window (PCMW) technique is employed to illustrate the gelation microdynamic mechanism of hydrogelator N-octyl-D-gluconamide (8-GA), which can rapidly self-agglomerate into helical bilayer micellar fibers upon cooling from spherical micelles. Boltzmann fitting and PCMW easily determined the gelation temperature to be ca. 72 °C and the transition temperature range to be 70–75 °C. Moreover, band shifting and splitting phenomena can be observed for CH-related overtones, indicating the formation of much ordered and tight hydrophobic core from octyl tails. On the other hand, 2Dcos was used to discern the sequential orders during the gelation process and concluded that all the group motions have a continuous transfer from the octyl tail to the chiral carbohydrate head followed by the final immobilization of the solvent, which meanwhile, is actually a continuous dehydration process from the hydrophobic core to the outer hydrophilic chiral head. The driving force of the gelation process in microdynamics can only be the dehydration process of hydrophobic octyl chains, but with final helical superstructures being stabilized by amide-associated hydrogen bonding and the “chiral bilayer effect” of carbohydrate heads.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jun Li,Peng Huang,Xiaoqi Cheng,Rongmin Wang,Yufeng He,Pengfei Song
Bacterial contamination in water bodies is potentially transmissible to humans, making water bodies a major pathway of bacterial transmission. However, existing hydantoin copolymer nanoparticles did not achieve the regulation of nanoparticle dispersion and particle size by adjusting the ratio of hydrogen-donors and hydrogen-acceptors. To tackle this issue, amphiphilic hydantoin copolymer nanoparticles (P(VBDH-BA-NVP)NPs) were synthesized by modulating hydrogen-donors and hydrogen-acceptors using emulsion polymerization, and amphiphilic N-halamine copolymer nanoparticles (P(ClV-BA-NVP)NPs) were subsequently prepared via chlorination treatment. Impressively, nanoparticle dispersion and particle size were modulated by adjusting the ratio of hydrogen-donors and hydrogen-acceptors. With the increase of nanoparticle dispersion and the decrease of particle size, the active chlorine content was gradually enlarged, and the antibacterial performance was progressively enhanced against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). More importantly, amphiphilic N-halamine copolymer nanoparticles with two-dimensional dispersing (2DD-P(ClV-BA-NVP)NPs) exhibited excellent antibacterial properties, which benefited from the dual coordination of direct contact killing and indirect release killing in aqueous medium. Through designing P(VBDH-BA-NVP)NPs with hydrogen bond interactions, this approach aims to achieve the constitutive relationship between the effective exposure of active sites and the antibacterial effect.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ci Li,Conghui Che,Fang Li,Wei Xue,Jing Li,Xinqiang Zhao,Yanji Wang
Ce-based composite oxides were used for catalyzing the methyl N-phenyl carbamate (MPC) synthesis from aniline and dimethyl carbonate. Among them, CuO–CeO2 exhibited the best catalytic performance. Characterization results showed that the second metal (Cu, Zn, Mn, Co, and Zr) can be doped into the CeO2 lattice and led to strong interactions, modifying the content of Ce3+, oxygen vacancy, and acidity of the catalyst. Notably, Ce3+, oxygen vacancies, and weak Lewis acid sites are beneficial to MPC synthesis. Additionally, CuO–CeO2–M, prepared by mechanical mixing, exhibited better catalytic activity than CuO–CeO2–C prepared by co-precipitation. This was due to the preparation method affecting the interaction between CuO and CeO2. CuO primarily interacted with CeO2 through interfacial contact in CuO–CeO2–C, whereas the interaction in CuO–CeO2–M involves both this interfacial contact effect and the presence of solid solution structures, thereby influencing the content of Ce3+, oxygen vacancy, and acidity.
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Materials
·
2024
·Vol. 17
·期 6
·1417
·
IF 3.1
Chen Zheng,Xu Han,Fangfang Sun,Yue Zhang,Zihang Huang,Tianyi Ma
Aqueous supercapacitors have occupied a significant position among various types of stationary energy storage equipment, while their widespread application is hindered by the relatively low energy density. Herein, N/F co-doped carbon materials activated by manganese clusters (NCM) are constructed by the straightforward experimental routine. Benefiting from the elevated conductivity structure at the microscopic level, the optimized NCM-0.5 electrodes exhibited a remarkable specific capacitance of 653 F g−1at 0.4 A g−1and exceptional cycling stability (97.39% capacity retention even after 40,000 cycles at the scanning rate of 100 mV s−1) in a neutral 5 M LiCl electrolyte. Moreover, we assembled an asymmetric device pairing with a VOxanode (NCM-0.5//VOx), which delivered a durable life span of 95% capacity retention over 30,000 cycles and an impressive energy density of 77.9 Wh kg−1. This study provides inspiration for transition metal element doping engineering in high-energy storage equipment.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jing Zhang,Zishuo Fang,Heng Dong,Yu Liu,Zhenyu Chu,Yongbin Mou,Wanqin Jin
In clinical settings, saliva has been established as a straightforward, noninvasive medium for diagnosing periodontitis. However, the precise diagnosis is often hampered by the absence of a specialized analyzer capable of detecting low concentrations of biomarkers typically found in saliva. In this study, we present a noninvasive, on-site screen-printed biomicrochip specifically engineered for the precise and sensitive quantification of lactate concentrations in saliva, a critical biomarker in the diagnosis of periodontitis. The microchip is constructed using a nanostructured ink formulation that includes MnFe@N-doped carbon nanotubes (MnFe@N-CNTs). These MnFe@N-CNTs exhibit a high degree of graphitization and low electrical resistance, significantly augmenting the electrocatalytic efficiency of the enzymatic reaction of lactate. This results in doubled sensitivity and a detection limit that surpasses those of the current advanced salivary assay methods. Remarkably, within just 30 s, the biomicrochip can quantitatively and precisely measure lactate concentrations in the saliva of 10 patients, which provides valuable insights into the severity of their periodontitis. This biosensor holds excellent potential for large-scale production and could broaden the scope of biomarker recognition, paving the way for the analysis of a wider range of oral diseases.
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高影响因子
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