INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Jie Guo,Yongjiang Hou,Bo Li,Yulei Liu
Ni–Co–B hollow nanospheres were synthesized by the galvanic replacement reaction using a Co–B amorphous alloy and a NiCl 2 solution as the template and additional reagent, respectively. The Ni–Co–B hollow nanospheres that were synthesized in 60 min (Ni–Co–B-60) showed the best catalytic activity at 303 K, with a hydrogen production rate of 6400 mL hydrogen min −1 g catalyst −1 and activation energy of 33.1 kJ/mol for the NaBH 4 hydrolysis reaction . The high catalytic activity was attributed to the high surface area of the hollow structure and the electronic effect. The transfer of an electron from B to Co resulted in higher electron density at Co sites. It was also found that Ni was dispersed on the Co–B alloy surface as result of the galvanic replacement reaction. This, in turn, facilitated an efficient hydrolysis reaction to enhance the hydrogen production rate. The parameters that influenced the hydrolysis of NaBH 4 over Ni–Co–B hollow nanospheres (e.g., NaOH concentration, reaction temperature, and catalyst loading) were investigated. The reusability test results show that the catalyst is active, even after the fifth run. Thus, the Ni–Co–B hollow nanospheres are a practical material for the generation of hydrogen from chemical hydrides .
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Journal of Materials Chemistry C
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2018
·Vol. 6
·期 33
·8958-8965
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IF 5.976
Jing Wang,Aisen Li,Shuping Xu,Bao Li,Chongping Song,Yijia Geng,Ning Chu,Jian He,Weiqing Xu
Continuous tunable photoemission of a novel co-crystal (9-acetylanthracene-tetrafluoroterephthalonitrile, 9ACA-TFP) depending on intermolecular charge transfer (CT) is achieved in situ under high pressure via a diamond anvil cell. Compared with other methods for tuning the emission of organic co-crystals based on organic synthesis or doped organic co-crystals, this pressure-based tuning method is simple and effective. The high-pressure data show that this organic co-crystal (9ACA-TFP) exhibits continuous redshifts in its emission bands (from 490 to 620 nm) with the pressure increasing, and its colour and emission bands can recover to their initial state once the pressure is completely released. Raman and ultraviolet-visible absorption spectra with pressure were also measured. All Raman vibrational bands move to higher wavenumbers and exhibit decreased intensities with pressure, proving that the shortened bond lengths and donor–acceptor–donor (D–A–D) interplanar distance result in stronger intermolecular interactions. The in situ absorption spectra of the 9ACA-TFP co-crystal show a 134 nm redshift from 0 to 7.22 GPa, indicating that high pressure enhances the intermolecular CT transition between D and A. The co-crystal materials show on/off switching of photoemission upon cycling compression and decompression. This study is of sigificance in determining the intermolecular CT interaction –photoemission property relation of organic co-crystals.
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Journal of Materials Chemistry A
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2018
·Vol. 6
·期 36
·17730-17739
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IF 9.931
Rui Zhang,Xiangxia Jing,Yanting Chu,Lei Wang,Wenjun Kang,Denghu Wei,Haibo Li,Shenglin Xiong
A novel monolithic carbon sponge is prepared by a ZnCl2-assisted carbonization of commercial melamine foam (MF) at 800 °C in a N2 atmosphere. The as-prepared nitrogen/oxygen co-doped carbon sponges (NOCSs) can be directly applied as monolithic electrodes for supercapacitors without using any additives. It is found that ZnCl2 activation plays an important role in improving the supercapacitive behavior of NOCSs. Compared with the NOCS without ZnCl2 activation treatment, the optimal NOCS-1/10, obtained with a ZnCl2/MF weight ratio of 1 : 10, has the best capacitive performance due to its unique porous architecture, rich pseudocapacitance-active species, and good electron/ion transfer feature. It exhibits a high specific capacitance (242 F g−1 at a current density of 0.5 A g−1 and 325 F g−1 at a scan rate of 10 mV s−1) and good electrochemical cyclability (97% after 10 000 cycles at 5.0 A g−1). When being further assembled into an all-solid-state supercapacitor (PVA/KOH electrolyte), it can deliver an energy density of 4.33 W h kg−1 at a power density of 250 W kg−1 and 3.13 W h kg−1 at a power density of 3 kW kg−1.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2018
·
IF 3.997
Min Yang,Houqiang Ding,Yixin Zhu,Yanxiu Ge,Lingbing Li
A strategy of preparing mixed micelles containing both DOX prodrug and PTX prodrug was developed, i.e., synthesizing a DOX conjugate and a PTX conjugate started with the same biocompatible amphiphilic copolymer, TPGS and DTDPA, a linker containing disulfide bond. The mixed micelles were prepared by co-assembling the two conjugates with a particle size about 98.5 nm. The mixed micelles could release anticancer drug DOX and PTX upon cellular reduction once they came into the cancerous cells. Moreover, the mixed micelles displayed synergistic effect in vitro and the combination therapy in micellar dosage-form led to reduced systematic toxicity and enhanced antitumor efficacy in vivo .
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Zhi Zhu,Xu Tang,Wenqian Fan,Zhi Liu,Pengwei Huo,Tianshuai Wang,Yongsheng Yan,Chunxiang Li
A new Co-doped and Fe 3 O 4 quantum dots (QDs) decorated g-C 3 N 4 (CN) photocatalyst applied in the tetracycline degradation under visible light irradiation, is designed and synthesized. The Fe 3 O 4 -QDs@Co CN enhanced photocatalytic activity and cycling ability in comparison with individual CN significantly. It revealed a synergistic effect between the formation of Fe 3 O 4 -QDs and Co-doping. Results of characterization insight into the reason that Co-doped can regulate the band gap of CN, which has been proved by XPS and density functional theory (DFT). Moreover, the oxidation-reduction centre of Fe 3 O 4 -QDs with quantum effect can significantly boost the absorption of visible light and utilization electrons. Therefore, this work provides a broadening window for photo harvesting, charge using and separation during photocatalytic reactions.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 6
·4589-4600
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IF 2.993
Tan Jiabin,He Xiaobo,Yin Fengxiang,Liang Xin,Chen Biaohua,Li Guoru,Yin Huaqiang
In this study, a β-Mo 2 C/N, P-co-doped carbon (NPC) catalyst with a porous structure of β-Mo 2 C nanoparticles loading on NPC matrix was prepared by vacuum-rotary evaporation and followed by a facile pyrolysis process for hydrogen evolution reaction (HER). The porous structure is beneficial for exposing more active sites and the mass transfer during the HER. In addition, the carbon matrixes with the highly doped N and P heteroatoms also provide their positive contributions to its high catalytic activity for HER. Owing to the advantages mentioned above, the optimized catalyst shows a small overpotential of 181 mV for driving a cathodic current density of 10 mA cm −2 , a low Tafel slope of 65.3 mV dec −1 and a high exchange current density of 1.5 × 10 −2 mA cm −2 during HER processes in acid electrolyte. The excellent performance of the β-Mo 2 C/NPC makes it a great potential candidate as the HER electrocatalyst.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 7
·H348
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IF 3.662
Le Wang,Hangjia Shen,Sanshuang Gao,Xamxikamar Mamat,Guangzhi Hu
As an excellent catalyst toward hydrogen peroxide reduction, Fe-based nanomaterial like Fe-N-C configuration is promising candidate to be used for H2O2 sensing. In this work, a novel N-doped mesoporous carbon by atomically dispersed Fe-N dopant composite modified electrode (Fe/NOMC) was prepared by hard template approach and then fabricated non-enzymatic sensor was used for H2O2 determination. The morphology and property of Fe/NOMC composite were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), small angle X-ray diffraction (XRD) spectrum and nitrogen-sorption measurement, respectively. The electrochemical sensing performance of the Fe/NOMC composite modified glassy carbon electrode (GCE) was studied by cyclic voltammetry and chronoamperometry methods. An excellent performance toward hydrogen peroxide reduction was achieved in a wide range of 8–23000 μM, with limitation of detection (LOD) about 5 μM and a correlation coefficient of 0.998, as well as a short response time (2 s) and good selectivity.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2018
·
IF 4.841
Yuxiang Cai,Xinbo Zhu,Wenshuo Hu,Chenghang Zheng,Yang Yang,Menghan Chen,Xiang Gao
Plasma-catalytic decomposition of low concentration ethyl acetate with LaMO 3 (M = Co, Mn and Fe) perovskite catalyst was investigated in a coaxial dielectric barrier discharge (DBD) reactor. The combination of perovskite catalyst and plasma enhanced ethyl acetate decomposition, and the activity sequence was LaCoO 3 > LaMnO 3 > LaFeO 3 . Characterizations results indicated that the activation of surface oxygen species and amount of oxygen vacancies contributed to ethyl acetate decomposition remarkably. FT-IR analysis demonstrated that the employment of LaCoO3 catalyst also reduced the amount of unwanted by-products. Based on these results, reaction mechanism of ethyl acetate plasma-catalytic decomposition process was proposed.
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CATALYSIS TODAY
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2018
·
IF 4.667
Lingcong Li,Xiaojun Liu,Hong He,Ningqiang Zhang,Ziwen Liu,Guizhen Zhang
The MgO-doped hexagonal boron nitride (MgO-h-BN) nanomaterials were designed as a support for Palladium (Pd) catalysts for CO oxidation reaction. The catalytic properties of Pd/MgO(5)-h-BN catalyst was investigated and compared with Pd/h-BN catalyst. Transmission electron microscopy (TEM) results suggested that the PdO nanoparticles with small grain sizes (ca. 8 nm) were effectively dispersed on the surface of MgO, and the MgO were deposited on the h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses revealed that a small amount of Mg 2+ embedded into the B vacancies of h-BN nanosheets in the Pd/MgO(5)-h-BN catalyst. More significantly, a large amount of adsorbed oxygen appeared near the B vacancies of Pd/MgO(5)-h-BN catalyst. The experiments outcomes of diffuse reflectance fourier transform spectra analysis of CO (CO-DRIFT) indicated that the carbonate/formate species were easily decomposed to CO 2 on the Pd/MgO(5)-h-BN catalyst than Pd/h-BN catalyst, which might be a reason why the Pd/MgO(5)-h-BN catalyst had high CO oxidation activity. According to above analyses, we provide a new insight for the MgO-h-BN nanomaterials for Pd catalysts for application in CO oxidation reaction.
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高影响因子
Acta Biomaterialia
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2018
·
IF 6.383
Meili Hou,Yong-E Gao,Xiaoxiao Shi,Shuang Bai,Xiaoqian Ma,Baosheng Li,Bo Xiao,Peng Xue,Yuejun Kang,Zhigang Xu
The goal of nanomedicine is to seek strategies that are more efficient to address various limitations and challenges faced by conventional medicines, including lack of target specificity, poor bioavailability, premature degradability, and undesired side effects. Self-assembling drug amphiphiles represent a prospective nanomedicine for cancer therapy owing to their favorable route of administration and therapeutic efficiency compared with pristine drug counterparts. In this work, we report a class of self-deliverable prodrug amphiphiles consisting of the hydrophilic drug methotrexate (MTX) and the hydrophobic anticancer drugs camptothecin (CPT) and doxorubicin (DOX) for targeted and combinational chemotherapy. The disulfide bond and hydrazone bond, which are subject to stimuli-triggered bond cleavage, were introduced to link these therapeutic agents and form two prodrug amphiphiles, named as MTX-CPT and MTX-DOX, respectively, which could self-assemble into stable prodrug nanoaggregates (NAs) in aqueous media. MTX molecules in the prodrug NAs facilitated NA uptake into tumor cells with high expression of folic acid receptors (FRs). This systemic study provided clear evidence of the synergistic therapeutic effect by co-administrating dual prodrug NAs on various tumor cells in vitro and a xenograft tumor model in vivo . The obtained prodrug amphiphiles provide an efficient strategy for the design of multifunctional drug delivery systems and elaborate therapeutic nanoplatforms for cancer chemotherapy. Statement of Significance This work presents two kinds of prodrug amphiphiles that are carrier free and integrate targeted drug delivery, stimuli-triggered drug release, synergistic therapy, and theranostic function into a single system. Reduction/acid active prodrug amphiphiles can self-assemble into micellar nanoaggregates (NAs) at a very low critical aggregation concentration. These NAs exhibit superior stability in physiological environment and disassemble in the presence of tumor cells expressing folic acid receptors or the high glutathione or in low pH tumoral endosomal environment. The induced disassembly of prodrug NAs can “switch on” the inherent fluorescence of the internalized camptothecin or doxorubicin for the detection of tumor cells. Compared to a single type of prodrug NA, co-administration of dual prodrug combination can produce an evident synergistic therapeutic effect against various tumor cells in vitro and inhibit xenograft tumor growth in vivo . The methotrexate-based prodrug amphiphiles may provide a potential strategy for developing multifunctional nanoplatforms and delivery of multiple therapeutics in chemotherapy.
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高影响因子
ChemPlusChem
·
2018
·Vol. 83
·期 11
·1038-1043
·
IF 3.205
Song Wang,Hejin Jiang,Li Zhang,Jian Jiang,Minghua Liu
Graphical Supramolecular gels formed from hemin and histidine amphiphiles were tested as artificial enzymes to catalyse the oxidation of the chiral substrate L-DOPA to L-dopachrome. The supramolecular gel made up of left-handed helices enhanced the catalytic activity of hemin effectively, and more interestingly, it exhibited enantioselectivity. Supramolecular co-assembly provides an efficient way to combine structural and functional units through noncovalent interactions and produce materials with enhanced performance. Here, using a chiral amphiphilic histidine derivative (LHC18 or DHC18) as a gelator, we have successfully co-assembled the gelator and hemin through gelation. During the co-assembly, the chiral information of the gelator was transcribed into the assemblies, and thus right- and left-handed helical ribbons from LHC18-Hemin and DHC18-Hemin co-assemblies were obtained, respectively, which were confirmed by CD spectra and SEM observations. These helical ribbons were used as artificial enzymes to catalyse the oxidation reaction of 3,4-dihydroxy-L-phenylalanine (L-DOPA). The catalytic activity of hemin in supramolecular gels can be effectively enhanced over that of free hemin. Moreover, by virtue of induced chirality, the supramolecular gels of LHC18-Hemin and DHC18-Hemin exhibited obvious enantioselective activity. This work provides a way to combine chirality transfer and supramolecular asymmetric catalysis.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 41
·20100-20109
·
IF 9.931
Xia Shi,Aiping Wu,Haijing Yan,Lin Zhang,Chungui Tian,Lei Wang,Honggang Fu
The rational combination of early-transition metal nitrides (ETMNs) with late-transition metals (LTMs) is a promising method for the design of highly efficient catalysts. Herein, we report the design of Co–Mo2N tubes based on a “MOFs plus MOFs” strategy for efficient electrocatalytic water splitting in 1 M KOH. The 1-D Mo-MOFs (Mo source) were prepared in large quantities by the reaction of imidazole with MoO3. ZIF-67 (Zeolitic Imidazolate Framework-67) (Co source) was then grown on the 1-D Mo-MOFs (Mo-based metal–organic frameworks) to obtain ZIF-67/Mo-MOFs by a solution-phase assembly method. The effective combination is due to the similarity of the ligands in the two MOFs. After nitriding, the ZIF-67 was converted into Co metal, and Mo-MOFs were converted into hollow Mo2N, thus giving a hollow Co–Mo2N hybrid with a Co outer layer on the Mo2N inner core. The ratio of Co and Mo in Co–Mo2N can be easily tuned to give optimized catalysts. The tests indicated that the combination of Co and Mo2N can significantly boost the HER performance of materials. At the current density of 10 mA cm−2, the overpotential (η10) on Co–Mo2N was only 76 mV, which is much lower than 296 mV for Mo2N derived from Mo-MOFs and 180 mV for Co–carbon from ZIF-67. The hybrid has also shown improved OER activity in comparison with Mo2N and Co; therefore, the Co–Mo2N can be used as both anode and cathode for an overall water-splitting cell with η10 of 1.576 V. The improved HER activity can be ascribed to the intimate contact between Co and Mo2N for optimized adsorption on reagents, the tube-like structure for easy mass transfer and the good conductivity of Mo2N, which is favourable for transmitting charge.
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