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Binder-Free Monoliths of Graphene Dried Foam Films Covering Polyaniline for Supercapacitors Electrode
Wufeng Chen, Junhao Chen, and Lifeng Yan
General Chemistry    DOI: 10.21127/yaoyigc20200014
Abstract   PDF (920KB)
Dried foam films (DFF) of graphene oxide (GO) has been prepared by dipping a titanium mesh in the solution of GO, and then it was reduced by electrochemical method. Next, the as-prepared water-containing reduced grapheme oxide (rGO) DFF film works as electrode for electrocpolymerization of aniline onto its surface for preparing a polyaniline/graphene monolith while the titanium mesh acts as the electron collector. The as-obtained composite film is binder-free and has highly surface area, conductivity, and can be used for supercapacitor electrode. Then network of plenty polyaniline nanoparticles formed on the surface of rGO film by electrochemical polymerization, which works as the material for pseudocapacitance. When the film is used as a supercapacitor electrode, the maximum specific capacitance is as high as 633.4 F g−1 and the specific capacitance retains 75% of the initial after constant charge discharge 5000 cycles at current density of 10 A g−1, indicating that the nanocomposite is a suitable active material for supercapacitors.
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SnSe Solar Cells: Current Results and Perspectives
Paul Beltrán-Bobadilla, A. Carrillo-Osuna, J. A. Rodriguez-Valverde, B. Acevedo-Juárez, I. Montoya De Los Santos, F. J. Sánchez-Rodriguez, and Maykel Courel
General Chemistry    DOI: 10.21127/yaoyigc20200012
Abstract   PDF (475KB)
This work presents current advances and perspectives on SnSe thin film solar cell technology. Nowadays, SnSe solar cells have not been able to achieve efficiency values higher than 7%. In this sense, it is necessary to study the potentiality of SnSe compound in solar cells that could help to understand further routes to promote this technology. It is demonstrated that efficiencies about 25% are expected under the ideal conditions of a low density of defects at SnSe bulk, the SnSe/buffer interface and the use of a buffer layer with a high band-gap, so that most photons get absorbed in the SnSe material with a good lattice matching to the SnSe and the negligible contribution of resistances. The comparison of our results with the one experimentally reported demonstrates that Jsc values constitute the first main issue to be solved in this technology.
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C—H Activation, a New Strategy for Synthesis of 3-Substituted Phthalides
Qianqian Sun, Runqing Zhu, Shuyu Hu, and Lizhen Fang
General Chemistry    DOI: 10.21127/yaoyigc20200010
Abstract   PDF (1912KB)
Phthalides are an important class of compounds owing to their role as the key structural motifs in bioactive natural products and pharmaceutical synthesis. C—H activation has become a promising strategy for preparation of phthalides due to its advantages of high efficiency and atomic economy compared with the traditional methods. In this paper, we summarized recent advances on synthesis of 3-substituted phthalides via C—H activation according to different transition metal catalytic systems.
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Hollow Polymer Capsules for Drug Delivery
Yuancheng Ji and Junqiu Liu
General Chemistry    DOI: 10.21127/yaoyigc20200009
Abstract   PDF (490KB)
Hollow polymer capsules (HPC) are one of the widely studied topics in two-dimensional (2D) materials as ar-tificial cargo carriers that simulate natural cells containing life substances and complex life activities, In the past two decades, methodologies and application scenarios for the synthesis of polymer capsules with diversified morphology and multiple functions have received extensive attention. In particular, well-defined HPC with hollow compartments can serve as a drug delivery system with high load capacity, low toxicity, targeted and efficient release. This perspective aims to briefly summarize the developed fabrication strategy of HPC, evaluate their application characteristics in drug encapsulation and delivery, and propose a development direction of HPC as an outstanding drug carrier system.
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Optical and Magnetic Properties of Superparamagnetic Fe3O4 Colloidal Nanoparticles
B. K. Pandey, A. K. Shukla, R. K. Kotanala, J. Shah, and R. Gopala
General Chemistry    DOI: 10.21127/yaoyigc20200006
Abstract   PDF (1241KB)
Magnetic nanomaterials gained widespread interest due to remarkable future applications in various fields. The purpose of present work is to explore magnetic and optical properties of ultra pure superparamagnetic Fe3O4 nanoparticles. Nowadays, superparamagnetism is receiving considerable interest in terms of biomedical and engineering applications. Herein, Fe3O4 superparamagnetic nanoparticles have been successfully synthesized by pulsed laser ablation method in the presence of anionic surfactants in liquid environments. The structural, morphological, optical and magnetic properties have been studies using X Ray diffraction (XRD), transmission electron microscope (TEM), UV-visible absorption, ATR-FTIR and vibrating sample magnetometer (VSM), respectively. The optical band gaps of as synthesized and after agglomeration Fe3O4 nanoparticles have been estimated in the range of 2.27—2.86 eV and 2.27—2.87 eV, depending on surfactant concentration. TEM image showed Fe3O4 nanoparticles possess mean diameter in the range of 5—25 nm. The saturation magnetization and coercivity of Fe3O4 nanoparticles have been estimated 0.36 emu·g-1 and 33 Oe at room temperature, respectively. Therefore, as synthesized Fe3O4 nanoparticles showed superparamagnetic character at room temperature.
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The Central Role of Chemistry in the Transition to Solar Economy: Outcomes of Two Lectures at the Russian Academy of Sciences
Mario Pagliaro
General Chemistry    DOI: 10.21127/yaoyigc20200007
Abstract   PDF (930KB)
On June 8 and 9, 2017, I gave two invited lectures at the Zelinsky Institute of Organic Chemistry (ZIOC) of the Russian Academy of Sciences, Moscow. The first lecture, “Sol-Gel Catalysts: Making Green Chemistry Possible”, focused on the practical outcomes of 25 years of research on sol-gel entrapped catalysts. The second, “Chemistry for the Bioeconomy: From Discussion to Action”, offered a critical insight to the forthcoming bioeconomy. Both lectures aroused much interest in the audience and ended with a vigorous discussion lasting about one hour. An outlook is provided in this study, whose core argument is that in the transition to the solar bioeconomy, chemistry will play a central role. In the latter economy, sunlight, water and wind replace fossil fuels to generate electricity that is then used for all energy end uses, while biomass replaces petroleum as raw material of the chemical industry with the oil refinery becoming a biorefinery.
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PVP-Protected Pt-Ru Nanoparticles as Highly Efficient Catalysts for Hydrogen Generation from Hydrolysis of Sodium Borohydride
Murat Rakap
General Chemistry    DOI: 10.21127/yaoyigc20200003
Abstract   PDF (829KB)
The employment of poly(N-vinyl-2-pyrrolidone) (PVP)-protected platinum-ruthenium nanoparticles (3.2 ± 1.4 nm) as catalysts in the hydrolysis of sodium borohydride for hydrogen generation is reported. They have been prepared by co-reduction of two metal ions in ethanol/water mixture by an alcohol reduction method and characterized by UV-Vis spectroscopy, TEM-EDX analysis, and X-ray photoelectron spectroscopy. They are recyclable and highly efficient catalysts for hydrogen generation from the hydrolysis of sodium borohydride even at very low concentrations and temperature, providing record average turnover frequency (TOF) value (549 mol•H2/mol•cat•min−1) and maximum hydrogen generation rate (16126 L•H2•min−1 (mol•cat)−1). Poly(N-vinyl-2-pyrrolidone)-protected platinum-ruthenium nano-particles also provide activation energy of 63.2 ± 2 kJ•mol−1 for the hydrolysis of sodium borohydride.
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Luminescence of Europium Complexes with Triazole-Containing Ligands
Jae Hoon Kim, A. I. Dalinger, A. V. Medvedko, E. V. Latipov, S. Z. Vatsadze, and V. V. Utochnikova
General Chemistry    DOI: 10.21127/yaoyigc20200002
Abstract   PDF (1397KB)
In the present work, eleven new complexes of europium and terbium with substituted azoles ligands were obtained as candidates for sensor materials for phosphinoxide. As a result, a new material with high sensitivity of up to 9%/µL was obtained.
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Advanced Layered Double Hydroxide-Based Electrocatalysts for Electrocatalytic Oxygen Evolution Reaction
Tariq Ali, Niaz Muhammad, Tingzhou Yang, and Chenglin Yan
General Chemistry    DOI: 10.21127/yaoyigc20200001
Abstract   PDF (477KB)
Layered double hydroxides (LDHs) are the most promising candidates among all candidates for electrocatalytic water splitting, especially oxygen evolution reaction. Electrocatalytic activities of LDHs can be attuned by exfoliation, composition, morphology regulation and by intercalating some species. Moreover, exfoliation and flexible ion exchange can be tuned by the unique intercalation properties via flexible tunability of multiple metal cations. However, certain limitations like bulk thickness, large lateral size and low conductivity of LDHs decrease their uses in oxygen evolution reaction. In order to increase its electrocatalytic performances, researchers introduce different strategies such as combining the conductive materials to LDHs to introduce defects and tune the electronic structure of LDHs to enhance the active sites and increase intrinsic activity. In this minireview, we summarized current progress, strategies, challenges and prospective in the fabrication and designing of LDHs materials by various species.
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Ultrasensitive in-vitro Detection Assay for Non-invasive Alzheimer’s Disease Diagnosis
See-Lok Ho, Hei-Nga Chan, Hung-Wing Li, Man-Shing Wong
General Chemistry    DOI: 10.21127/yaoyigc20190035
Abstract   PDF (165KB)
Alzheimer’s disease (AD) is the most prevalent cause of dementia. According to the Alzheimer’s Disease Association, there are over 37 million patients currently suffering from AD. To date, there is still no standard method for accurate AD diagnosis. Detection of biomarkers has become a new trend for disease diagnosis as research has shown that alternation of the expression profile of biomarkers occurs over 10 years before the development of any symptoms. Recently, there is a considerable development in the field of ultrasensitive detection assay for AD diagnosis. This perspective gives an updated review of the current state of development on body fluid-based detection assay for non-invasive AD diagnosis.
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