CHEMICAL PAPERS
·
2016
·Vol. 70
·期 7
·888-897
·
IF 1.326
Yin Zhou,Rui-Ren Tang,Dan Song
N -hydroxyphthalimide (NHPI) combined with stable and recoverable transition metal–aluminium binary hydrotalcite-like compounds (M-Al HTLcs, M = Cu, Ni, Co) as an unprecedented catalytic system was demonstrated for the allylic carbonylation, as the model reaction, of cyclic olefins with tert-butyl hydroperoxide (TBHP), using isophorone (IP) to ketoisophorone (KIP). The results showed NHPI combined with Cu-Al HTLcs to be an efficient catalytic system and the influences of various reaction conditions of the catalytic reaction were optimised. A maximum IP conversion of 68.0 % with 81.8 % selectivity to KIP was afforded under the optimal reaction conditions. Experiments of repeatability and restorability showed Cu-Al HTLcs to be stable for at least five cycles without noticeable loss of catalytic activity. Expanding substrates could also be efficiently converted to the corresponding ketones under the optimised reaction conditions with appreciable yields. A plausible catalytic reaction mechanism was proposed.
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhan Cheng,Hongmin Zhu,Hanyang Ji,Zhenyu Yuan,Fanli Meng
N-butanol, a standard volatile organic compound (VOC) gas with toxicity and flammability, seriously endangers human life and health. It is imperative to achieve rapid and trace detection of n-butanol. Oxygen vacancies have been proven to be an essential factor for VOC gas adsorption at the surface of metal oxide semiconductor (MOS) gas sensors. In view of the above, BiFeO3 (BFO) nanoparticles with abundant oxygen vacancies were prepared via simple sol–gel and annealing. Crystal structure, morphology, and compositions were systematically analyzed by a series of characterizations (XRD, SEM, HRTEM, EPR, and XPS). The response of the synthesized BFO-2 sensor reached 19.37 to 100 ppm n-butanol with a detection limit of 0.28 ppm at an optimal operating temperature of 280 °C. In addition, BFO-2 also has a fast response time, good stability and repeatability, and favorable selectivity to n-butanol. It is crucial to systematically explore the excellent selectivity of BFO sensors due to their abundant oxygen vacancies and large intrinsic crystal defects. Herein, adjusting the calcination temperature is one constructive strategy to tune the oxygen vacancy, which would prompt the gas sensing performance of BFO sensors to n-butanol.
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 12
·1496
·
IF 4.501
Fengyun Su,Zhishuai Wang,Haiquan Xie,Yezhen Zhang,Chenghua Ding,Liqun Ye
Hydrogen evolution by photocatalytic technology has been one of the most promising and attractive solutions, and can harvest and convert the abundant solar energy into green, renewable hydrogen energy. As a new kind of photocatalytic material, graphitic carbon nitride (g-C3N4) has drawn much attention in photocataluytic H2production due to its visible light response, ease of preparation and good stability. For a higher photocatalyic performance, N defects were introduced in to the traditional g-C3N4in this work. The existence of N defects was proved by adequate material characterization. Significantly, a new absorption region at around 500 nm of N-deficient g-C3N4appeared, revealing the exciting n-π* transition of lone pair electrons. The photocatalytic H2production performance of N-deficient g-C3N4was increased by 5.8 times. The enhanced photocatalytic performance of N-deficient g-C3N4was attributed to the enhanced visible light absorption, as well as the promoted separation of photo-generated carries and increased specific surface area.Keywords:N defects;g-C3N4;H2evolution;photocatalysis;n-π* transition
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Yu Lei,Yibo Tang,Guijun Li,Changguo Chen
Optimizing the microstructure is crucial to design the N-doped carbon-based electrocatalysts towards oxygen reduction reaction (ORR). Herein, a 1D/0D composited catalyst (L-Fe-CN-C) is prepared by using graphitic carbon nitride, iron chloride and carbon black as the raw materials. The resultant catalyst is consisted of N-doped carbon nanotubes and nanoparticles. The nanotubes are dramatically shrunk and smaller carbon nanoparticles are simultaneously generated with the pre-addition of carbon black, both contributing to the large specific surface area, high space utilization and to construct a mesopore-dominated microstructure. Moreover, the content of active pyridinic N is increased in the resultant catalyst. Benefiting from the modulation, the catalyst exhibits an excellent ORR activity with 0.850 V of half wave potential, 6.224 mA cm −2 of limited diffusion current density and high selectivity to 4e-path of ORR in 0.1 M KOH. The zinc-air battery with the catalyst on air electrode outputs a high peak power density, high specific capacity and excellent long-term durability, being comparable to those of the benchmark Pt/C based battery. This work provides a rational strategy to controllably synthesize an N-doped carbon ORR catalyst with hierarchical structure and preferable performance.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 20
·9403-9414
·
IF 4.682
Fan Lei,Xu Zhilong,Sun Peizheng,An Lanfang,Han Jie,Guo Rong
Bacterial infection is a growing threat to public health worldwide. Ferrous ions have been proved to have good antibacterial properties. However, ferrous ions are easy to be oxidized, which limited its further application. Therefore, the design of nanosystems that can stably release ferrous ions is highly desirable. Here, N-doped hollow carbon nanospheres anchored with Fe 7 S 8 nanosheets (N-HCNs@Fe 7 S 8 ) were synthesized by a hydrothermal method. The particle size, crystal form, and specific surface area of the synthesized composites were characterized. N-HCNs@Fe 7 S 8 can release Fe 2+ ions, which could kill Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) without using light or H 2 O 2 . Fe 2+ concentration increases with the prolonged soak time of N-HCNs@Fe 7 S 8 , and the antibacterial ability is closely related to Fe 2+ concentration. The Fe 2+ released by N-HCNs@Fe 7 S 8 has a promoting effect on the healing of skin wounds infected with S. aureus . The proinflammatory cytokines (TNF-α and IL-6) were effectively reduced in N-HCNs@Fe 7 S 8 -treated wounds, and N-HCNs@Fe 7 S 8 could effectively inhibit inflammation. Therefore, the Fe 2+ release effect of N-HCNs@Fe 7 S 8 and its good biocompatibility make it a candidate material for antibacterial therapy and promoting wound healing. Graphical abstract
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Lei You,Shunlong Ju,Jianwen Liu,Guanglin Xia,Zaiping Guo,Xuebin Yu
Li metal is the most ideal anode material for next-generation high energy lithium-ion batteries. The uncontrollable growth of Li dendrites, however, hinders its practical application. Herein, we propose the adoption of Zn nanoparticles uniformly embedded in N-doped carbon polyhedra homogeneously built on carbon cloth (Zn@NC@CC) to prevent the formation of Li dendrites. Based on theoretical calculation and experimental observation, lithiophilic Zn nanoparticles and N-doping inside of the as-synthesized Zn@NC play a synergistic role in enhancing the adsorption capacity with Li, thus resulting in uniform Li deposition and complete suppression of Li dendrites. Moreover, the porous N-doped carbon polyhedras uniformly distributed on carbon cloth effectively relieves the volume change of Li upon repeated Li stripping/plating process, which contributes to preserving the structural integrity of the whole electrode and hence enhancing its long-term cycling stability. Benefiting from these synergistic effects, the Li-Zn@NC@CC electrode delivers a prolonged lifespan of over 1200 h at 1 mA cm −2 with an areal capacity of 1 mA h cm −2 in symmetric cells and high Coulombic efficiencies of 95.4% under an ultrahigh capacity of 12 mA h cm −2 . Remarkably, Li-Zn@NC@CC//LiFePO 4 full cells deliver a high reversible capacity of 110.2 mA h g −1 at 1C over 200 cycles.
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Beibei Liu,Xiaohua Ren,Long Chen,Xiaoxin Ma,Qiong Chen,Qidi Sun,Lin Zhang,Pengchao Si,Lijie Ci
High efficient adsorption of radioiodine in nuclear waste has attracted extensive attentions all over the world. In this work, we fabricated sulfur and nitrogen co-doped graphene aerogels (SN-GA) through one-step hydrothermal method, and investigated its iodine adsorption behavior including adsorption kinetics and isotherms in water. Our results reveal that SN-GA exhibits a 3D porous architecture with thiophene-S, oxidized-S, pyridine-N, pyrrole-N and graphite-N co-doped into the sp 2 carbon frameworks. The adsorption experiment showed SN-GA has a maximum iodine adsorption capacity of 999 mg g −1 determined by Langmuir isotherm, and the adsorption process could be better described by the pseudo-second-order model.
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zhi-Wen Zhang,Cui-Ying Lu,Guang-Hui Liu,Yuan-Jia Cao,Zhen Wang,Ting-ting Yang,Yu-Hong Kang,Xian-Yong Wei,Hong-Cun Bai
A green and effective nitrogen and nickel in-situ doping strategy was designed to prepare cellulose-based N/Ni co-doped porous carbon (PC). The co-hydrothermal pretreatment induced by hydrazine hydrate and nickel acetate effectively modifies the physico-chemical structure of PC and further improves its electrochemical performance. The efficient N-supply and unique heteroatom regulation performance of hydrazine hydrate is related to its strong reducibility. The specific surface area and total pore volume of the synthesized N 4 NiPC 220-3 are 1383.66 m 2 g −1 and 0.59 cm 3 g −1 , while the N and O contents are 1.35 and 10.41%, respectively. At current densities of 0.5 and 20 A g −1 , N 4 NiPC 220-3 exhibits a high specific capacitance of 415 F g −1 and a good capacitance retention of 72.22%, respectively. After 10,000 charge/discharge cycles, the retention rate is as high as 96.06%, confirming its excellent cycling stability. The two-electrode system test results further show that the energy density of N 4 NiPC 220-3 is as high as 35.6 W h kg −1 at a power density of 500.1 W kg −1 , while a high retention rate of 87.87% is still obtained after 10,000 cycles. This green and efficient synthesis method based on in-situ co-doping of hydrazine hydrate and nickel acetate is a promising alternative strategy for producing carbon-based supercapacitors.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Shuang Ji,Zhourong Xiao,Haocui Zhang,Ling Li,Guozhu Li,Li Wang,Guozhu Liu
A high surface area (HSA) Ce 0.75 Zr 0.25 O 2 (CZ) support was synthesized by hydrothermal synthesis method with assistance of surfactant (cetyltrimethyl ammonium bromide , CTAB), and then 2.0 wt% Ru was impregnated on it to obtain a steam reforming catalyst for n-dodecane. The surface area of Ru/HSA-CZ catalyst is 107.6 m 2 g −1 , which is ca. three times higher than that prepared through the sol-gel (sg) method (34.3 m 2 g −1 , Ru/CZ-sg) and ca. 40% higher than that without CTAB (76.7 m 2 g −1 , Ru/CZ-wo). Catalytic steam reforming of n-dodecane, shows the completely conversion of n-dodecane over Ru/HSA-CZ and slightly drops about 6% (650 °C, LHSV = 12 mL/g h, S/C = 4, time on stream = 7 h) while 81% and 70% were observed for the Ru/CZ-wo and Ru/CZ-sg but with twice (or triple) deactivation rates. The possible reason for observed better performance of Ru/HSA-CZ should be attributed to the high metal dispersion of Ru over HSA-CZ, and the favorable Ru-support interaction as evidenced by H 2 -Temperature programmed reduction (H 2 -TPR), and high redox ability of high surface area Ce 0.75 Zr 0.25 O 2 support thanks to high Ce 3+ content. Further steam reforming of n-dodecane over Ru/HSA-CZ at higher LHSV (750 °C, LHSV = 36 mL/g h, S/C = 4) exhibits completed conversion and without significant deactivation.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Hongyu Dong,Ke Li,Yiwen Wang,Yanhong Yin,Shuting Yang
Lithium-oxygen (Li–O 2 ) batteries are an ideal energy storage device, but the problems of the cathode still hinder their development. In this work, a metal-free, binder-free and in situ pyridine N-doped cathode of Li–O 2 batteries is synthesized in one step by electrospinning. Meanwhile, the effect of carbonization temperature on cathode is discussed in detail. The content of pyridine N in the cathode is the highest at the carbonization temperature of 700 °C, and it is also the most effective for the reversible formation and decomposition of Li 2 O 2 . In terms of Li–O 2 batteries performance, when the charge and discharge current density is 100 mA g −1 and the discharge voltage is greater than 2 V, the discharge specific capacity and discharge capacity can reach 27900 mAh g −1 and 27.9 mAh respectively. In addition, when the limited specific capacity is 1000 mAh g −1 , the batteries can work stably for 85 cycles under the same conditions. Therefore, the high-performance cathode which synthesized in one step by electrospinning is expected to promote the commercial application of Li–O 2 batteries.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Yong Chen,Panwei Yu,Guoyuan Ren,Qiang Zhang,Qiuxia Han,Hongni Teng
Antibacterial modification of polymers with potent biocides via an efficient and universal approach is very desirable in both academia and industry. A polysiloxane with both quaternary ammonium and N-chloramine was prepared via a facile three-step synthetic route. Poly(methylhydrosiloxane) (PMHS) was first reacted with 2-(dimethylamino)ethyl acrylate to introduce an ending tertiary amine that was subsequently quaternized with 3-(3-chloropropyl)-5,5-dimethylhydantoin (CPDMH). The 5,5-dimethylhydantoin moiety was then transformed into its N-chloramine counterparts by chlorination with tert-butyl hypochlorite to produce quaternary ammonium (quat)/N-chloramine polysiloxane. The CO2-philic quat/N-chloramine polysiloxane was interpenetrated into polyethylene terephthalate (PET) in supercritical carbon dioxide (scCO2) and formed a 70 nm biocidal layer. The synthetic procedures and interpenetration results were characterized with Fourier transform infrared spectroscopy (FTIR), 1H NMR, scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The incorporation of quaternary ammonium and N-chloramine exhibited improved synergetic biocidal performance against Staphylococcus aureus and Escherichia coli, providing a complete kill of a 7-log reduction of both species within a contact time of 10 min. The polysiloxane interpenetration layer was stable and the rechargeability of lost chlorine was good when the layer was subjected to repeated washing, storage, and UV irradiation. This modification procedure uses ecologically responsible CO2 as solvent and is expected to be applicable to substrates of other chemistry since it does not rely on chemical linkage.
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2014
·
IF 1.178
Dong-Shun Deng,Guo-Qiang Han,Xiao Zhu,Xuan Xu,Yu-Tong Gong,Yong Wang
Mesoporous N-doped carbon supported palladium catalyst Pd@CN 0.132 was able to efficiently catalyze unprotected indole to indoline under mild conditions. In the aqueous system, a selectivity of 100% and conversion of 96% was achieved under 313 K and atmospheric hydrogen gas.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）