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Changwei Hu, Hui Zhang, Xudong Liu, Jianmei Li, Zhicheng Jiang
In present work, the performances of solvents, including γ-butyrolactone (GBL), γ-valerolactone (GVL), tetrahydrofuran (THF), ethyl acetate (EAC), 2-methyl tetrahydrofuran (2-MeTHF), and the corresponding mixture with H2O, on the cleavage of inter- and intra-molecular linkages of lignin in corncob residue were investigated. At 200 oC miscible co-solvents (H2O-GBL, H2O-GVL and H2O-THF) exhibited much better efficiency for lignin dissolution than both immiscible co-solvents (H2O-EAC and H2O-2-MeTHF) and pure solvents...
March 15, 2018: ChemSusChem
Yu Hang Li, Ling Cheng, Peng Fei Liu, Le Zhang, Meng Yang Zu, Chong Wu Wang, Yan Huan Jin, Xiao Ming Cao, Huagui Yang, Chunzhong Li
Electrocatalytic reduction of carbon dioxide (CO2) to carbon monoxide (CO) is the first step in carbon-based fuels synthesis and feedstocks using renewable electricity. Although molybdenum or tungsten based compounds can efficiently catalyze this reaction, they generally require the costly ionic liquid as electrolyte, making it essential to find a suitable compound substitute to achieve CO2 reduction with high selectivity in aqueous medium. Here we demonstrate a simple cadmium sulfide as an efficient and stable electrocatalyst for CO2 reduction in aqueous medium for more than 40 hours with a steady CO Faradaic efficiency of ca...
March 14, 2018: ChemSusChem
Xuefeng Guo, Chao Yu, Zhouyang Yin, Shouheng Sun, Christopher Takakazu Seto
We report a Ni30Pd70/nitrogen-doped graphene (NG) catalyst that hydrodehalogenates halogenated aromatics under mild reaction conditions. It reduces mono- or dichloroarenes to the corresponding dehalogenated arenes in >90% yield in 10% aqueous isopropanol solvent at or below 50C within 5 hours. Tests on a variety of substrates containing various functional groups show that the catalyst is selective for reduction of C-Cl and C-Br bonds. In addition, this catalyst completely hydrodehalogenates high concentration solutions of dioxin, polychlorinated biphenyls (PCBs), chloroaromatic constituents of the defoliant agent orange, and polybrominated diphenyl ethers (PBDEs) in 12 hours...
March 14, 2018: ChemSusChem
Liping Zhang, Alexandre Goncalves, Baojiang Jiang, Mietek Jaroniec
Due to the scarcity of iodine as well as its threat to the environment if in excess, iodine as a waste needs to be captured. As compared with ion-exchange resins and silver-containing materials, which are two popular iodide adsorbents, bismuth-containing compounds show some important advantages such as high iodide capture capacity and fast kinetics. In this study, two bismuth-containing compounds, bismuth vanadate (BiVO4) and bismuth oxide (Bi2O3), have been comprehensively investigated for iodide immobilization...
March 14, 2018: ChemSusChem
Steffen Jeschke, Patrik Johansson, Piotr Jankowski, Adam Best
Cyclodextrins (CDs) are pyranoside-based macromolecules with a hydrophobic cavity to encapsulate small molecules. They are used as molecular vehicles, for instance in pharmaceutical drug delivery or as solubility enhancer of monomers for their polymerization in aqueous solution. In this context, it was discovered about 10 years ago that the bis(trifluoromethylsulonyl)imide (TFSI) anion forms host-guest complexes with βCD in aqueous media. The rising interest in using the TFSI anion in lithium-based battery electrolytes open for its encapsulation by βCD as an attractive approach to increase the contribution of the cation to the total ion conductivity...
March 12, 2018: ChemSusChem
Yongbing Lou, Yake Zhang, Lin Cheng, Jinxi Chen, Yixin Zhao
he localized surface plasmon resonance (LSPR) effect has been widely utilized in photocatalysis, but most reported LSPR materials are based on noble metals of Au or Ag with high chemical stability. The plasmonic Cu nanoparticles exhibiting LSPR absorbance locating at 600 nm are promising for lots of applications such as photocatalysis. Unfortunately, plasmonic Cu nanoparticles are bothered by their serious surface oxidation in air. Herein, a novel lollipop-shaped Cu@Cu2O/ZnO heterojunction nanostructure was designed, for the first time, to stabilize the plasmonic Cu core by decorating ZnO nanorods onto Cu@Cu2O core-shell structures...
March 12, 2018: ChemSusChem
Fabian Single, Arnulf Latz, Birger Horstmann
Continued growth of the solid electrolyte interphase (SEI) is the major reason for capacity fade in modern lithium-ion batteries. This growth is made possible by a yet unidentified transport mechanism that limits the passivating ability of the SEI towards electrolyte reduction. We, for the first time, differentiate the proposed mechanisms by analyzing their dependence on the electrode potential. Our calculations are compared to recent experimental capacity fade data. We show that the potential dependence of SEI growth facilitated by solvent diffusion, electron conduction, or electron tunneling qualitatively disagrees with the experimental observations...
March 12, 2018: ChemSusChem
Bert Marc Weckhuysen, Ronald Jong, Guido Mul, Jochem Wijten
Photocathodes for hydrogen evolution from water were made by electro-deposition of Ni-Mo layers on NiFe2O4 substrates, deposited by spin coating on F:SnO2-glass. SEM-EDX and XRD analysis confirmed the formation of two separate layers, without significant reduction of NiFe2O4. Bare NiFe2O4 was found unstable under alkaline conditions during (photo)-electrochemistry. To improve the stability significantly the deposition of a bifunctional Ni-Mo layer through a facile electrodeposition process was performed, and the composite electrodes show stable operation for at least 1 h...
March 12, 2018: ChemSusChem
Kashif Mairaj Deen, Edouard Asselin
The development of a hybrid system, capable of storing energy, and with the additional benefit of Cu extraction is discussed in this work. A fixed bed flow cell (FBFC) was used in which a composite negative electrode containing CuFeS2 (80 wt. %) and carbon black (20 wt. %) in graphite felt was separated from a positive (graphite felt) electrode by proton exchange membrane. The anolyte (0.2M H2SO4) and catholyte (0.5M Fe2+ in 0.2M H2SO4 with or without 0.1M Cu2+ addition) were circulated in the cell. With the addition of Cu2+ in the catholyte, the electrochemical activity of the Fe2+/Fe3+ redox couple over graphite felt was significantly improved...
March 8, 2018: ChemSusChem
Zhen Zhan, Zhongzhen Yang, Dena Ma, Hao Zhang, Yuesen Shi, Qiantao Wang, Yong Deng, Li Hai, Yong Wu
An efficient protocol for the synthesis of thiophosphates is described. Without using any metallic catalyst, base and solvent, the direct sulfur-phosphorus bond coupling reaction of disulfides and dialkyl trimethylsilyl phosphite (DTSP) was promoted under neat reaction condition in moderate to excellent yields with good functional group compatibility. The reaction condition is superior to other methods not only in predigesting process but also in shortening the reaction time apparently. Notably, these transformations are easy to conduct and can be readily applied to gram-scale preparation...
March 8, 2018: ChemSusChem
Xin Li, Xiaohong Sun, Zhiwen Gao, Xudong Hu, Rui Ling, Shu Cai, Chunming Zheng, Wenbin Hu
SnS2/graphene composites have attracted extensive attention in energy storage due to their excellent electrochemical performance. However, most of the previous methods to synthesize SnS2/graphene composites require long time, high temperature, or high pressure, which are obstacles for practical low-cost production. Herein, we reported a simple one-pot strategy to prepare SnS2/graphene composites, which is not time consuming (1 h) and requires moderate-temperature (75 °C) in atmosphere. Through this method, ultrafine SnS2 nanoparticles anchored on graphene nanosheets have been successfully prepared and achieved excellent electrochemical performance for both lithium/sodium storage...
March 8, 2018: ChemSusChem
Angela Dibenedetto, Maria Ventura, Francesco Lobefaro, Elvira de Giglio, Monica Distaso, Francesco Nocito
Mixed oxides based on MgO·CeO2 were used, as efficient catalysts, in the aerobic oxidation of 5-(hydroxymethyl)furfural (5-HMF) to afford, with very high selectivity, either 2,5-diformylfuran (DFF, 99%) or 2-formyl-5-furancarboxylic acid (FFCA, 90%) depending on the reaction conditions. 5-Hydroxymethyl-2-furancarboxylic acid (HMFCA, 57-90%) was formed only at low concentration of 5-HMF (<0.03 M) or in presence of external bases. The conversion of 5-HMF ranged from a few units to 99 %, according to the reaction conditions...
March 7, 2018: ChemSusChem
Niklas Lindahl, Björn Eriksson, Henrik Grönbeck, Rakel Wreland Lindström, Göran Lindbergh, Carina Lagergren, Björn Wickman
Fuel cells are foreseen to have an important role in sustainable energy systems, provided that catalysts with higher activity and stability are developed. In this work, we deposit highly active sputtered thin films of platinum alloyed with yttrium (Pt3Y) on commercial gas diffusion layers and measure their performance in a proton exchange membrane fuel cell. After acid pretreatment, the alloy is found to have up to 2.5 times higher specific activity than pure platinum. The performance of Pt3Y is much higher than pure Pt, even if all of the alloying element was leached out from parts of the thin metal film on the porous support...
March 7, 2018: ChemSusChem
Basudeb Saha, Sibao Liu, Trent Simonetti, Weiqing Zheng
High yields of diesel ranged alkanes are achieved by hydrodeoxygenation of vegetable oils and waste cooking oils over ReOx modified Ir/SiO2 catalysts under mild reaction conditions. The catalyst containing a Re/Ir molar ratio of 3 exhibits the best performance, achieving 79-85 wt% yield of diesel ranged alkanes at 453 K and 2 MPa H2. The yield is nearly quantitative to the theoretical possible long-chain alkanes on the basis of weight of converted oils. The catalyst retains comparable activity upon regeneration via calcination...
March 7, 2018: ChemSusChem
Yan Chen, Weiyi Yang, Shuang Gao, Linggang Zhu, Caixia Sun, Qi Li
A built-in electric field from their internal polarization inside polar photocatalysts could provide the driving force for photogenerated electrons and holes to move in opposite directions for better separation to improve their photocatalytic performance. In this study, we enhanced the photocatalytic performance of a polar photocatalyst of Bi2MoO6 by the precise control of its structure to increase its internal polarization. DFT calculation predicted that a shortened crystal lattice parameter b in Bi2MoO6 could induce a larger internal polarization, which was achieved by the modulation of the reaction solution pH in its solvent-thermal synthesis process...
March 6, 2018: ChemSusChem
Dengfeng Yu, Chong Chen, Gongyuan Zhao, Lei Sun, Baosheng Du, Hong Zhang, Zhuo Li, Ye Sun, Flemming Besenbacher, Miao Yu
Low-cost activated carbons with high capacitive properties remain desirable for supercapacitor applications. Herein, three-dimensional scaffolding framework of porous carbon nanosheets (PCNSs) has been produced from a typical biowaste, i.e. ground cherry calyces, whose specific composition and natural structures have contributed the PCNSs a very large specific surface area of 1612 m2 g-1, a hierarchical pore-size distribution, a turbostratic carbon structure with high degree graphitization, and ~10% heteroatoms of O and N...
March 5, 2018: ChemSusChem
Minheng Ye, Xin Wang, Enzuo Liu, Jinhua Ye, Defa Wang
While used widely as co-catalysts in promoting a photocatalytic reaction, noble metals are suffered from the high cost and rarity for practical applications. Development of noble-metal-free co-catalysts is thus highly demanded. Here we report for the first time on utilizing the titanium carbide (Ti3C2) MXene as a highly efficient noble-metal-free co-catalyst with commercial titania (P25) for photocatalytic CO2 reduction. In particular, surface alkalinization of Ti3C2 dramatically enhances the activity, i.e...
March 2, 2018: ChemSusChem
Yuhou Pei, Chaonan Mu, Haixia Li, Fujun Li, Jun Chen
Potassium-ion batteries (KIBs) are of interest for large-scale electric energy storage, owing to abundance of K resources and potentially high energy density. Low-cost cathodes with high performance are crucial for KIBs. Here, we report K4Fe(CN)6 as a low cost and high-voltage cathode for KIBs for the first time. It can deliver a high voltage of ~3.6 V and discharge capacity of 65.5 mAh g-1 with a lifespan of 400 cycles of discharge and charge. This is attributed to the strong σ bonds between C atoms and Fe, and the reduced particle size and good contact with conductive carbon by ball-milling, which benefit both the K+ ion and electron conduction...
March 1, 2018: ChemSusChem
Xianghong Liu, Tiantian Ma, Li Sun, Yongshan Xu, Jun Zhang, Nicola Pinna
Graphene/metal oxide (MO) nanocompsites hold great promise for application as an anode in Li-ion batteries (LIBs). However the restack of graphene during the subsequent processing remains a challenge to be overcome for enhancing the lithium storage properties. In this work, we demonstrate the fabrication of sandwiched architecture of carbon-riveted graphene/SnO2 nanorods, where the SnO2 nanorods are confined in the nanospaces formed by the carbon layers on graphene, by a two-step hydrothermal process followed by thermal treatment...
March 1, 2018: ChemSusChem
Elwira Bisz, Michal Szostak
Iron-catalyzed cross-coupling reactions allow for sustainable formation of C-C bonds using cost-effective, earth-abundant base-metal catalysis in complex areas of pharmaceutical development, natural product and fine chemical synthesis. The major challenge to maintain full sustainability of the process is the identification of green and renewable solvents that can be harnessed to replace the conventional solvents in this highly attractive manifold. Herein, we report that the iron-catalyzed cross-coupling of aryl chlorides and tosylates with challenging organometallics possessing beta-hydrogens that proceed in good to excellent yields using green, sustainable and eco-friendly 2-methyltetrahydrofuran (2-MeTHF)...
March 1, 2018: ChemSusChem
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