Institute of Chemistry
Changchun Institute of Applied Chemistry, Chinese Academy Of SciencesNot a member yet
23443 research outputs found
Sort by
Beyond graphene: materials chemistry toward high performance inorganic functional materials
No full textMuch progress about graphene has been made in the fields of physics, chemistry, material science, and electronics. Graphene's properties are mainly dependent on its geometric structures and synthesis methods. Various newly developed chemical methods have been designed to tailor graphene materials with specific functionalities, such as crystallization routes, which can be a new direction in graphene R&D. In this review, we focus on recent developments in the synthesis of graphene materials with specific structures and electrochemical performances by top-down routes. First, ice crystallization from water molecules within graphene oxide is discussed to form 3D graphene oxide aerogel and graphene aerogel with porous networks. Then we review an in situ electrochemical crystallization route to fabricate graphene/metal oxide aerogel electrode materials. The electrochemical properties of different structural graphene types are discussed as lithium-ion batteries and supercapacitors. Future challenges and current progress beyond graphene as an energy storage material have been highlighted
A Fe-doped Ni3S2 particle film as a high-efficiency robust oxygen evolution electrode with very high current density
No full textThe efficiency of water splitting is mainly limited by the low rate of the oxygen evolution reaction (OER) and it is thus of great importance but still remains a huge challenge to develop efficient OER catalysts capable of delivering high current densities at low overpotentials. Herein, we describe our recent finding that a Fedoped Ni3S2 particle film with 11.8% Fe-content hydrothermally grown on nickel foam (Fe-11.8%-Ni3S2/NF) behaves as a highly active robust oxygen evolution electrode in strongly alkaline media. This electrode needs an overpotential of only 253 mV to achieve 100 mA cm(-2) with a Tafel slope of 65.5 mV dec(-1) and maintains its catalytic activity for at least 14 h in 1 M KOH, and the NiOOH and FeOOH formed at the Fe-11.8%-Ni3S2 surface are the actual catalytic sites. Notably, it also operates efficiently and stably in 30 wt% KOH, capable of affording very high current densities of 500 and 1000 mA cm(-2) at small overpotentials of 238 and 269 mV, respectively, with a faradaic efficiency of 100%
Protein-DNA interactions: a novel approach to improve the fluorescence stability of DNA/Ag nanoclusters
No full textProtein-DNA interactions are known to play an important role in a variety of biological processes. We have shown here that protein-DNA binding events can also be used to greatly improve the fluorescence stability of DNA-templated Ag nanoclusters (Ag NCs), which would be highly beneficial for Ag NCs in applications of biosensing/imaging
3D graphene nanomaterials for binder-free supercapacitors: scientific design for enhanced performance
No full textBecause of the excellent intrinsic properties, especially the strong mechanical strength, extraordinarily high surface area and extremely high conductivity, graphene is deemed as a versatile building block for fabricating functional materials for energy production and storage applications. In this article, the recent progress in the assembly of binder-free and self-standing graphene-based materials, as well as their application in supercapacitors are reviewed, including electrical double layer capacitors, pseudocapacitors, and asymmetric supercapacitors. Various fabrication strategies and the influence of structures on the capacitance performance of 3D graphene-based materials are discussed. We finally give concluding remarks and an outlook on the scientific design of binder-free and self-standing graphene materials for achieving better capacitance performance
IL-derived N, S co-doped ordered mesoporous carbon for high-performance oxygen reduction
No full textA highly efficient N, S co-doped porous carbon ORR catalyst was simply designed in our report from ordered mesoporous carbon (OMC) and trace ionic liquids (ILs). The microstructure OMC was chosen as the template for improving the specific area, confining the ILs in the mesopores, and promoting the formation of the planar N and S doping. The resulting IL/OMC (IOMC) nanostructure exhibits comparable ORR activity and better stability than the commercial Pt/C catalyst in 0.10 M KOH solution, which makes it one of the best-performing metal-free carbon ORR catalysts. We deduced that the excellent ORR activity is attributed to the synergistic effect of N, S, and the ordered mesoporous structure. Interestingly, the ORR activity can be further boosted in both basic and acidic solutions after Fe doping into the IOMC nanostructures which clearly emphasizes that transition metal Fe is important for the construction of ORR active functional sites especially in acidic solution
ZSM-5-supported multiply-twinned nickel particles: Formation, surface properties, and high catalytic performance in hydrolytic hydrogenation of cellulose
No full textNickel multiply-twinned particles (Ni MTPs) imbedded onto ZSM-5 were prepared, and their formation and chemical and electronic properties were characterized by HRTEM, XPS, CO-FTIR, and H-2-TPD. HRTEM showed the formation of Ni MTPs with triangular, square, hexagonal, and spherical shapes. The multiply-twinned particles were composed of f.c.c. nanocrystals dominated by (111) crystal face. Ni MTPs indicate an enhanced CO adsorption capability as compared with ordinary Ni particles. Ni MTPs were electron deficient and inherently strained, which is responsible for high catalytic activity in the hydrolytic hydrogenation of cellulose. (C) 2015 Elsevier Inc. All rights reserved
Syndioselective coordination polymerization of unmasked polar methoxystyrenes using a pyridenylmethylene fluorenyl yttrium precursor
No full textUnprecedented coordination-insertion polymerizations of polar methoxyl substituted styrene derivatives, in despite of the position of the substituent, have been achieved using a pyridyl methylene fluorenyl yttrium bis(alkyl) precursor with high activity to give polar polystyrenes of high molecular weight and perfect syndiotacticity
Enzyme-free and DNA-based multiplexer and demultiplexer
No full textA DNA-based 2:1 multiplexer and 1:2 demultiplexer have been conceptually realized in enzyme-free conditions. For the first time, the designed DNA-based multiplexer could be implemented by keeping input/output signal homogeneity, which has great potential application in information processing
High quality graphitized graphene as an anode material for lithium ion batteries
No full textHigh quality graphitized graphene has been successfully synthesized by solid-exfoliation of graphite and a subsequent wet chemical process. The as-obtained graphene exhibits charge-discharge behaviour quite different from that of reduced graphene oxide and shows enhanced cycling and rate performance compared with commercial mesocarbon microbeads (MCMBs) for lithium ion batteries
Breaking of the Phosphodiester Bond: A Key Factor That Induces Hemolysis
No full textIn-depth understanding the toxicity of nanomaterials in red blood cells (RBCs) is of great interest, because of the importance of RBCs in transporting oxygen in blood circulation. Although the toxic effects of nanoparticles in RBCs have been revealed, the conclusions from the literature are conflicting, and in particular, the toxic mechanism is still at the infant stage. Herein, we investigated the size-dependent toxicity of well-known CdTe semiconductor quantum dots (QDs) and revealed the exact toxic mechanism at the molecular level by confocal microscopy and Fourier transform infrared (FT-IR) spectroscopy techniques. We found that smaller mercaptosuccinic acid-capped CdTe QDs (MSA-QDs) with the green-emitting color could cause hemagglutination whereas the middle-size yellow-emitting MSA-QDs induced the formation of stomatocytes and echinocytes and the bigger size red-emitting MSA-QDs induced heavy hemolysis and the formation of lots of ghost cells. The FT-IR data proved that all the MSA-QDs were likely to bond to the RBCs membranes and caused the structural changes of lipid and protein in RBCs. But only the red-emitting MSA-QDs caused the breakage of the phosphodiester bond, which might cause the heavy hemolysis. To some extent, this is the first example that reveals the hemolysis mechanism at the molecular level