Key Laboratory of Advanced Energy Materials Chemistry

Tianjin, China

Key Laboratory of Advanced Energy Materials Chemistry

Tianjin, China
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Wang L.,Shandong University | Wang L.,Nankai University | Gu W.,Nankai University | Gu W.,Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry | And 8 more authors.
Zeitschrift fur Anorganische und Allgemeine Chemie | Year: 2012

Solvothermal combination of trivalent lanthanide metal precursors with 1, 2, 4, 5-cyclohexanetetracarboxylic acid (L) ligand has afforded the preparation of a family of eight new coordination polymers [Ln 4(L) 3(H 2O) 10]·7H 2O (Ln = Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) (1-8). Structural analyses reveal that the 1, 2, 4, 5-cyclohexanetetracarboxylic acid ligand with e,a,a,e (L I) conformation displays a μ 4-(κ 3O, O, O 5)(κ 2O 2,O 2) (κ 2O 4,O 4)-bridging mode to generate 3D frameworks of complexes 1-8 and the α-Po topology with the short Schläfli symbol {4 12.6 3} could be observed in complexes 1-8. The near-infrared luminescence properties were studied, and the results have shown that the Ho III, Er III, and Yb III complexes emit typical near-infrared luminescence in the solid-state. Variable-temperature magnetic susceptibility measurements of complexes 2-7 have shown that complex 2 (Gd) shows the ferromagnetic coupling between magnetic centers, whereas the complexes 3-7 show the antiferromagnetic coupling between magnetic centers. Additionally, the thermogravimetric analyses were discussed. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xiang X.,Key Laboratory of Advanced Energy Materials Chemistry | Xiang X.,Nankai University | Zhang K.,Key Laboratory of Advanced Energy Materials Chemistry | Zhang K.,Nankai University | And 2 more authors.
Advanced Materials | Year: 2015

Sodium-ion batteries (SIBs) receive significant attention for electrochemical energy storage and conversion owing to their wide availability and the low cost of Na resources. However, SIBs face challenges of low specific energy, short cycling life, and insufficient specific power, owing to the heavy mass and large radius of Na+ ions. As an important component of SIBs, cathode materials have a significant effect on the SIB electrochemical performance. The most recent advances and prospects of inorganic and organic cathode materials are summarized here. Among current cathode materials, layered transition-metal oxides achieve high specific energies around 600 mW h g-1 owing to their high specific capacities of 180-220 mA h g-1 and their moderate operating potentials of 2.7-3.2 V (vs Na+/Na). Porous Na3V2(PO4)3/C nanomaterials exhibit excellent cycling performance with almost 100% retention over 1000 cycles owing to their robust structural framework. Recent emerging cathode materials, such as amorphous NaFePO4 and pteridine derivatives show interesting electrochemical properties and attractive prospects for application in SIBs. Future work should focus on strategies to enhance the overall performance of cathode materials in terms of specific energy, cycling life, and rate capability with cationic doping, anionic substitution, morphology fabrication, and electrolyte matching. Various inorganic and organic compounds are being studied as cathode materials of sodium-ion batteries (SIBs), which mainly cover transition-metal oxides, polyanionic compounds, metal hexacyanometalates, aromatic carbonyl compounds, pteridine derivatives, and functional polymers. Currently, layered transition-metal oxides are most promising for application in SIBs owing to their high specific energies and the large space of promoting cycling life and rate capability. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bian W.,Nankai University | Bian W.,Key Laboratory of Advanced Energy Materials Chemistry | Yan B.,Nankai University | Yan B.,Key Laboratory of Advanced Energy Materials Chemistry | And 10 more authors.
Materials Science and Engineering C | Year: 2012

Mesoporous materials, especially functionalized ones, have become a promising carrier for enzyme immobilization. We synthesized room temperature ionic liquid-decorated mesoporous SBA-15 (RTIL-SBA-15) for papain immobilization. The results of powder XRD, IR and N 2 adsorption-desorption isotherms have confirmed that ionic liquid [Simim +][Cl -] was successfully grafted on the surface of SBA-15. As a consequence of the electrostatic attraction between the cation [Simim +] and the negatively charged papain, RTIL-SBA-15 had an advantage over SBA-15 when papain was immobilized at pH = 9.00. The kinetic study showed that the interaction between papain and the carrier was stronger after ionic liquid modification. In the casein hydrolysis, the papain immobilized on RTIL-SBA-15 showed a higher specific activity than that on SBA-15, implying that the ionic liquid [Simim +][Cl -] was beneficial to improve the activity of the immobilized papain. The optimum pH of the immobilized papain was shifted to higher than that of free enzyme. © 2011 Elsevier B.V. All rights reserved.

Zhang C.,Nankai University | Zhang C.,Key Laboratory of Advanced Energy Materials Chemistry | Liang X.,Nankai University | Liang X.,Key Laboratory of Advanced Energy Materials Chemistry | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2011

Pyrolytic waste tire char was modified to be used as support and a series of catalysts supported with 0.1-1.0 wt% Pt were prepared by conventional wetness impregnation method. TEM images show that the Pt nanoparticles are well-dispersed in any microregions in the sample view on the TEM grid. The results of methylcyclohexane dehydrogenation reaction show the Pt loadings and the reaction temperature have a significant impact on the catalytic activity. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Bian W.,Nankai University | Bian W.,Key Laboratory of Advanced Energy Materials Chemistry | Lou L.-L.,Nankai University | Lou L.-L.,Key Laboratory of Advanced Energy Materials Chemistry | And 8 more authors.
Microporous and Mesoporous Materials | Year: 2011

Carboxyl-modified mesoporous materials have been demonstrated as efficient carriers for immobilizing enzymes. However, little attention has been paid to the effect of H2SO4 treatment, a key in the synthesis of carboxyl-modified carriers, on the immobilization. To examine the H 2SO4 treatment's influence, we contrasted the ability of immobilizing papain between SBA-15 and the one after H2SO4 treatment (H2SO4-treated SBA-15). Meanwhile, the contribution of the as-synthesized carboxyl to the immobilization was also rechecked by comparing carboxyl-modified SBA-15 (COOH-SBA-15) and H 2SO4-treated SBA-15. In relation to the experiments, the H2SO4 treatment increases the immobilizing ability of SBA-15, especially when the immobilization performs near the pI of papain. Moreover, the as-synthesized carboxyl facilitates the immobilization by means of strengthening the hydrophobic dehydration at the interface, instead of merely through electrostatic forces. Additionally, the carboxyl makes a large contribution to inducing the favorable conformation change of papain, improving the specific activity, catalytic efficiency, and binding affinity of the immobilized enzyme when combined with the substrate. © 2011 Elsevier Inc. All rights reserved.

Du J.,Key Laboratory of Advanced Energy Materials Chemistry | Chen C.,Key Laboratory of Advanced Energy Materials Chemistry | Cheng F.,Key Laboratory of Advanced Energy Materials Chemistry | Chen J.,Key Laboratory of Advanced Energy Materials Chemistry | Chen J.,Nankai University
Inorganic Chemistry | Year: 2015

Transition-metal oxides have attracted extensive interest as oxygen-reduction/evolution reaction (ORR/OER) catalyst alternatives to precious Pt-based materials but generally exhibit limited electrocatalytic performance due to their large overpotential and low specific activity. We here report a rapid synthesis of spinel-type CoMn2O4 nanodots (NDs, below 3 nm) monodispersed on graphene for highly efficient electrocatalytic ORR/OER in 0.1 M KOH solution. The preparation of the composite involves the reaction of manganese and cobalt salts in mixed surfactant-solvent-water solution at mild temperature (120 °C) and air. CoMn2O4 NDs homogeneously distributed on carbonaceous substrates show strong coupling and facile charge transfer. Remarkably, graphene-supported CoMn2O4 NDs showed 20 mV higher ORR half-wave potential, twice the kinetic current, and better catalytic durability compared to the benchmark carbon-supported Pt nanoparticles (Pt/C). Moreover, CoMn2O4/reduced graphene oxide afforded electrocatalytic OER with a current density of 10 mA cm-2 at a low potential of 1.54 V and a small Tafel slope of ∼ 56 mV/dec. This indicates that the composite of CoMn2O4 nanodots monodispersed on graphene is promising as highly efficient bifunctional electrocatalysts of ORR and OER that can be used in the areas of fuel cells and rechargeable metal-air batteries. © 2015 American Chemical Society.

Liu J.,Shanxi Datong University | LU C.,Shanxi Datong University | LU C.,Key Laboratory of Advanced Energy Materials Chemistry | Jin C.,Shanxi Datong University | And 2 more authors.
Chemical Research in Chinese Universities | Year: 2016

Periodic density functional theory(DFT) calculations are presented to describe the adsorption and decomposition of CH3OH on Ru(0001) surfaces with different coverages, including p(3×2), p(2×2), and p(2×1) unit cells, corresponding to monolayer(ML) coverages of 1/6, 1/4, and 1/2, respectively. The geometries and energies of all species involved in methanol dissociation were analyzed, and the initial decomposition reactions of methanol and the subsequent dehydrogenations reactions of CH3O and CH2OH were all computed at 1/2, 1/4, and 1/6 ML coverage on the Ru(0001) surface. The results show that coverage exerts some effects on the stable adsorption of CH3O, CH2OH, and CH3, that is, the lower the coverage, the stronger the adsorption. Coverage also exerts effects on the initial decomposition of methanol. C—H bond breakage is favored at 1/2 ML, whereas C—H and O—H bond cleavages are preferred at 1/4 and 1/6 ML on the Ru(0001) surface, respectively. At 1/4 ML coverage on the Ru(0001) surface, the overall reaction mechanism can be written as 9CH3OH→3CH3O+6CH2OH+9H→6CH2O+3CHOH+18H→ 7CHO+COH+CH+OH+26H→8CO+C+O+36H. © 2016, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.

PubMed | Key Laboratory of Advanced Energy Materials Chemistry
Type: Journal Article | Journal: Angewandte Chemie (International ed. in English) | Year: 2016

Developing rechargeable Na-CO2 batteries is significant for energy conversion and utilization of CO2 . However, the reported batteries in pure CO2 atmosphere are non-rechargeable with limited discharge capacity of 200mAhg(-1) . Herein, we realized the rechargeability of a Na-CO2 battery, with the proposed and demonstrated reversible reaction of 3CO2 +4Na2Na2 CO3 +C. The battery consists of a Na anode, an ether-based electrolyte, and a designed cathode with electrolyte-treated multi-wall carbon nanotubes, and shows reversible capacity of 60000mAhg(-1) at 1Ag(-1) (1000Whkg(-1) ) and runs for 200cycles with controlled capacity of 2000mAhg(-1) at charge voltage <3.7V. The porous structure, high electro-conductivity, and good wettability of electrolyte to cathode lead to reduced electrochemical polarization of the battery and further result in high performance. Our work provides an alternative approach towards clean recycling and utilization of CO2 .

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