Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences
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A new uranyl triphosphonate constructed from semi-rigid triphosphonate ligand: New method for the construction of higher dimensional uranyl phosponates
No full textA new uranyl triphosphonate with three-dimensional crystal structure has been synthesized from a semi-rigid triphosphonate ligand using hydrothermal method. The employment of triphosphonate ligand may provide a new strategy for the construction of higher dimensional uranyl phosphonates. The thermal and luminescent properties were also investigated. (C) 2017 Elsevier B.V. All rights reserved
Selective Semihydrogenation of Alkynes Catalyzed by Pd Nanoparticles Immobilized on Heteroatom-Doped Hierarchical Porous Carbon Derived from Bamboo Shoots
No full textHighly dispersed palladium nanoparticles (Pd NPs) immobilized on heteroatom-doped hierarchical porous carbon supports (N,O-carbon) with large specific surface areas are synthesized by a wet chemical reduction method. The N,O-carbon derived from naturally abundant bamboo shoots is fabricated by a tandem hydrothermal-carbonization process without assistance of any templates, chemical activation reagents, or exogenous N or O sources in a simple and ecofriendly manner. The prepared Pd/N,O-carbon catalyst shows extremely high activity and excellent chemoselectivity for semihydrogenation of a broad range of alkynes to versatile and valuable alkenes under ambient conditions. The catalyst can be readily recovered for successive reuse with negligible loss in activity and selectivity, and is also applicable for practical gram-scale reactions
Effect of precipitators on the morphologies and electrochemical properties of Li1.2Mn0.54Ni0.13Co0.13O2 via rapid nucleation and post-solvothermal method
No full textDifferent morphologies of Li-rich layered oxides, Li1.2Mn0.54Co0.13Ni0.13O2 (LMNCO), were synthesised using a rapid nucleation and post-solvothermal method followed by calcination. After the process of rapid nucleation, the as-prepared mixture of M(OH)(2) using NaOH as the precipitator showed nanoplate aggregation, while the mixture of MCO3 using (NH4)(2)CO3 as the precipitator presented a spherical morphology. After subsequent solvothermal processing and calcination, Li1.2Mn0.54Co0.13Ni0.13O2 samples with uniform nanoplate particles (LMNCO-P) and spherical particles (LMNCO-S) were obtained. The as-prepared LMNCO-P and LMNCO-S samples exhibited excellent electrochemical performance and delivered high initial discharge capacities of 282 and 278 mA h g(-1) respectively, at 0.1C with a cut-off voltage in the range 2.0-4.8 V. The LMNCO-S cathode material exhibited outstanding cycling performance with capacity retention ratios of 88%, 89%, and 92% at 1, 2, and 5C, respectively, after 100 cycles. Furthermore, after a stepped pre-cycling treatment, the capacity retention of the LMNCO-S cathode material reached 79% after 500 cycles at 5C. The superior cycling performance can be ascribed to the spherical morphology with a small surface area, which decreased side reactions with the electrolyte and enhanced the crystal structure stability after the pre-cycling treatment. (C) 2016 Elsevier Ltd. All rights reserved
Interface Engineering of a Compatible PEDOT Derivative Bilayer for High-Performance Inverted Perovskite Solar Cells
No full textInterface engineering is an important aspect for the improvement of perovskite solar cells (PVSCs). The hole transport layer with good interface contact, transport capability, and matched energy level is indispensable and critical for high-performance photovoltaic devices. Herein, anode interface engineering with an excellent compatible bilayer of poly(3,4-ethylene dioxythiophene): poly(styrenesulfo-nate)/poly(3,4-ethylene dioxythiophene) (PEDOT:PSS/PEDOT) doped with grafted sulfonated-acetone-formaldehyde lignin (PEDOT:GSL) via a low-temperature and water-soluble process is presented. As a water-processable interface material, PEDOT:GSL exhibits higher conductivity, as well as better structural and electronic homogeneities compared with PEDTO:PSS. Consequently, the PEDOT:PSS/PEDOT:GSL bilayer with tuned energy level, optical properties, and the combination of the trap passivation of GSL at the anode/perovskite interface can greatly improve charge extraction ability and reduce the interface recombination. Simultaneously, the homogeneous perovskite film is fabricated through optimizing the annealing process. The device with the power conversion efficiency up to 17.80% is achieved, with 32.6% improvement compared to PEDOT:PSS-only device (13.42%). Our success to achieve high-performance inverted PVSCs provides new understanding of PEDOT:PSS, and also new guidelines for anode interface engineering to further advancement of PVSCs. This promising approach paves the way to realize solution processable highly efficient PVSCs for potential practical applications
Effect of the desilication of H-ZSM-5 by alkali treatment on the catalytic performance in Fischer-Tropsch synthesis
No full textHierarchical HZSM-5 zeolites were prepared by post-synthesis treatment of HZSM-5 zeolite with different concentrations of NaOH. The physicochemical properties of these zeolites loaded by cobalt nanoparticles in Fischer-Tropsch (FT) synthesis were investigated. It was found that the activity and CH4 selectivity increased at first, then decreased closely related to the change of catalyst reducibility indicating that higher cobalt reducibility was a prerequisite for hierarchical zeolites to improve FT catalytic performances. The catalyst treated with 0.1 M NaOH was found to be optimal for C12-18 selectivity, which was mainly attributed to bimodal porous structure to improve diffusion behavior of products combining with moderate acid sites to mitigate second reactions. While the catalyst treated with 0.15 M NaOH showed the lowest activity and higher CH4 selectivity due to its lower reducibility even the largest mesopores were observed
A comparative study of the photovoltaic performances of terpolymers and ternary systems
No full textRandom terpolymers were synthesized from the electron-rich unit thiophene as the donor and two electron-deficient units with complementary absorption as the acceptor. Polymer solar cells (PSCs) fabricated from these terpolymers were compared with those fabricated from the ternary blends of two alternating polymers to explore the best strategy for extending the light absorption range. The two approaches showed similar open-circuit voltages (Voc) but different short-circuit current densities (Jsc). The terpolymer strategy broadened the light absorption range and provided a high power conversion efficiency (PCE) of 5.8%. This is due to a high Jsc and high hole mobility. The device fabricated from the ternary blend exhibited a lower PCE (3.5%) compared to those fabricated from the terpolymers and alternating polymer blends due to the morphological incompatibility of the donor polymers. Our results illustrate the potential of the terpolymer systems as a promising strategy to effectively increase the light absorption and thereby performance of PSCs by combining two morphologically incompatible polymers
Direct Analysis of Succinic Acid Fermentation Broth by H-1 Diffusion-Ordered NMR Spectroscopy and Quantitative H-1 NMR Technique
No full textThe diffusion-ordered NMR spectroscopy (DOSY) protocol was first introduced to analyze directly the mixture samples of succinic acid fermentation broth. The NMR signals of the model mixtures and the practical mixture were facilely separated, and each component was fully assigned in the diffusion dimension of DOSY spectra. The composition of succinic acid fermentation broth could be rapidly determined according to the DOSY experiments. In contrast, this qualitative analysis could not be implemented through ion chromatography technique. On the basis of DOSY experimental results, the quantitative H-1 NMR (qHNMR) technique was further used to determinate successfully the components of one mixture sample of practical fermentation broth, which agreed well with the high-performance liquid chromatographic experimental result. The quantitative analysis results demonstrate that the DOSY technique and the qHNMR technique can determination of the product quality of succinic acid fermentation broth
A novel on-chip immobilization strategy for imaging analysis of neuronal response to gas cues in C. elegans
No full textC. elegans was widely used as a prominent model organism in the study of physiological response to gaseous environment, thanks to its suitability for in vivo optical imaging of neuronal sensing. Immobilization of the active worms is a key procedure to obtain high-resolution imaging and gas stimulations. In this work, we presented a novel microfluidic approach for immobilizing C. elegans due to the fact that its movement could be eliminated under the condition of gentle surface-dehydration. Nitrogen gas was directly injected into the microfluidic chip to dehydrate the surface of worm appropriately, resulting in rapid and repetitive immobilization of C. elegans. The imaging analysis of subcellular distribution of DAF-16, a well-known transcription factor regulating different stress responses, indicated that this dehydration-based immobilization method would not induce obvious stress response of the worm within 20 min. Furthermore, this microfluidic device could generate gas stimulation to the immobilized worm without the interference resulted from the switch of liquid-gas. Finally, the developed micro-device clearly demonstrated that URX neuronal responses were induced by oxygen gas with increasing levels of 0-20%, indicating that this method could be used for imaging analysis of gas-evoked neuronal sensing, especially to the pressure-change sensitive neurons in C elegans. (C) 2017 Elsevier B.V. All rights reserved
Thienothiophene-based copolymers for high-performance solar cells, employing different orientations of the thiazole group as a pi bridge
No full textIn this work, a thiazole moiety was employed as a pi bridge incorporated into the backbone of quinoid polymers. The new strategy combined the characteristics of a thiazole unit with a deep HOMO energy level and a thieno[3,4-b] thiophene moiety (TT) with broad absorption. Two isomeric D-A copolymers, PTBTz-2 and PTBTz-5, were synthesized, with different orientations of the thiazole to the TT moiety. Interestingly, in comparison with PTBTz-5, PTBTz-2 exhibited an even lower HOMO energy level, a higher dipole moment, and a more planar molecular configuration, together with preferable phase domains and good intermixing with PC71BM. Thus, a superior PCE of 9.72% for the photovoltaic device was obtained, with a remarkable J(SC) of 16.84 mA cm(-2), which is among the highest values for a singlejunction solar cell. This is an increase of similar to 40% in PCE in comparison with PTBTz-5 (PCE = 6.91%) and twice as much as for PBT-0F with thiophene as the p-bridge (PCE = 4.5%). This work not only provides a promising high-performance thiazole-containing system, but also reveals that the orientation of the asymmetric unit along the polymer backbone plays a crucial role and should be taken into account in future molecule design
Rubricella aquisinus gen. nov., sp nov., a novel member of the family Rhodobacteraceae
No full textA Gram-stain negative, ovoid or short rod-shaped, aerobic and non-motile bacterial strain, designated J82(T), was isolated from a seawater sample collected from the coast of Yellow Sea in Qingdao, China. The strain grew at salinities of 1.0-6.0% (w/v) NaCl (optimum, 2.5%). Growth occurred at pH 6.0-8.0 (optimum, pH 7.0) and 10-42 A degrees C (optimum, 28-30 A degrees C). The genomic DNA G + C content was determined to be 57.5 mol%. Q-10 was detected as the respiratory quinone. The major fatty acid (> 10%) was Summed feature 8 (C-18:1 omega 7c and/or C-18:1 omega 6c). The polar lipids consisted of phosphatidylethanolamine, two unidentified aminolipids and two unidentified polar lipids. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain J82(T) forms a distinct evolutionary lineage within the family Rhodobacteraceae. On the basis of phenotypic, chemotaxonomic and phylogenetic characteristics, the strain merits recognition as representative of a novel genus and species within the family Rhodobacteraceae for which the name Rubricella aquisinus gen. nov., sp. nov. is proposed. The type strain of Rubricella aquisinus is J82(T) (= DSM 103377(T) = CCTCC AB 2016170(T))