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ChemSusChem

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https://www.readbyqxmd.com/read/28742268/carbon-dioxide-capture-by-aqueous-ionic-liquid-solutions
#1
Jairton Dupont, Nathalia M Simon, Marcileia Zanatta, Francisco P Dos Santos, Marta C Corvo, Eurico J Cabrita
Confined water in aqueous solutions of imidazolium-based ionic liquids (ILs) associated with acetate and imidazolate anions react reversibly with CO2 to yield bicarbonate. Three types of CO2 sorption in these "IL-aqueous solutions" were observed: physical, CO2-imidazolium adduct generation and bicarbonate formation (up to 1.9 mol of bicarbonate/mol of IL), resulting in a 10/1 mol/mol total absorption of CO2 relative to imidazolate anions in the presence of water 1/1000 (IL/water). These sorption values are higher than the classical alkanol amines or even alkaline aqueous solutions under similar experimental conditions...
July 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28742246/aquivion-pfsa-as-an-efficient-pickering-interfacial-catalyst-for-the-hydrolysis-of-triglycerides
#2
Marc Pera-Titus, Hui Shi, Bing Hong, Flora Fan
Aquivion® Perfluorosulfonic Superacid catalyzed efficiently the solvent-free hydrolysis of glyceryl trilaurate at 100 oC and ambient pressure via the genesis of stable Pickering emulsions.
July 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28741880/towards-extending-solar-cells-life-time-addition-of-a-fluorous-cation-to-triple-cation-based-perovskite-films
#3
Manuel Salado, M Asunción Fernández, Juan P Holgado, Samrana Kazim, M K Nazeeruddin, P J Dyson, Shahzada Ahmad
Organo metal halide perovskites have emerged as highly promising replacements for thin film solar cells. However, their poor stability under ambient conditions remains problematic, hindering commercial exploitation. Here, we describe our investigation on the incorporation of a fluorous-functionalized imidazolium cation in a highly stable cesium based mixed perovskite material (Cs0.05(MA0.15FA0.85)0.95Pb(I0.85Br0.15)3 and how it influnce enhances stability. The resulting materials, which vary according to the content of the fluorous-functionalized imidazolium cation, display a prolonged tolerance to atmospheric humidity (>100 days) along with power conversion efficiencies exceeding 16%...
July 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28741864/pseudocapacitive-desalination-of-brackish-water-and-seawater-via-vanadium-pentoxide-decorated-multi-walled-carbon-nanotubes
#4
Juhan Lee, Pattarachai Srimuk, Katherine Aristizabal, Choonsoo Kim, Soumyadip Choudhury, Yoon-Chae Nah, Frank Mücklich, Volker Presser
We introduce membrane pseudocapacitive deionization (MPDI) of a hybrid cell consisting of one electrode of hydrated vanadium pentoxide (hV2O5) decorated on multi-walled carbon nanotubes electrode (MWCNT) and one electrode of activated carbon. This hybrid system enables sodium removal by pseudocapacitive intercalation to MWCNT-hV2O5 electrode and chloride removal by non-Faradaic electrosorption of the porous carbon electrode. MWCNT-hV2O5 electrode was synthesized by electrochemical deposition of hydrated vanadium pentoxide on the MWCNT paper...
July 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28737254/1d-and-2d-nmr-spectroscopy-of-bonding-interactions-within-stable-and-phase-separating-organic-electrolyte-cellulose-solutions
#5
Matthew T Clough, Christophe Fares, Roberto Rinaldi
Organic electrolyte solutions (mixtures containing an ionic liquid and a polar, molecular co-solvent) are highly versatile solvents for cellu-lose. However, the underlying solvent-solvent and solvent-solute interactions are not yet fully understood. Herein, mixtures of the ionic liquid 1-ethyl-3-methylimidazolium acetate, the co-solvent 1,3-dimethyl-2-imidazolidinone, and cellulose are investigated using 1D and 2D NMR spectroscopy. The use of a triply-13C-labelled ionic liq-uid enhances the signal-to-noise ratio for 13C NMR spectroscopy, enabling changes in bonding interactions to be accurately pinpoint-ed...
July 24, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28737002/nanofiltration-enabled-in-situ-solvent-and-reagent-recycle-for-sustainable-continuous-flow-synthesis
#6
Tamas Fodi, Christos Didaskalou, Jozsef Kupai, Gyorgy T Balogh, Peter Huszthy, Gyorgy Szekely
The solvent usage in the pharmaceutical sector accounts for as much as 90% of the overall mass during manufacturing processes. Consequently, solvent consumption poses significant costs and environmental burden. Continuous processing, in particular continuous-flow reactors have a great potential in the sustainable production of pharmaceuticals but subsequent downstream processing remains challenging. Separation processes for the concentration and purification of chemicals can account for as much as 80% of the total manufacturing costs...
July 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28736985/conducting-polymers-crosslinked-with-sulfur-as-cathode-materials-for-high-rate-ultralong-life-lithium-sulfur-batteries
#7
Ligui Li, Shuaibo Zeng, Lihong Xie, Dengke Zhao, Nan Wang, Shaowei Chen
Low electrical conductivity and lack of chemical confinement are two major factors that limit the rate performance and cycling stability of cathode materials in lithium-sulfur (Li-S) batteries. Herein, sulfur is copolymerized with poly(m-aminothiophenol) (PMAT) nanoplates via inverse vulcanization, leading to a highly crosslinked copolymer cp(S-PMAT) in which about 80 wt% of the feeding sulfur is chemically bonded with the thiol groups of PMAT. The cp(S-PMAT)/C based cathode exhibits a high discharge capacity of 1240 mAh g-1 at 0...
July 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28736950/impact-of-interfacial-layers-in-perovskite-solar-cells
#8
An-Na Cho, Nam-Gyu Park
Perovskite solar cell (PCSs) is composed of organic-inorganic lead halide perovskite as light harvester. Since the first report on long-term durable 9.7% efficient solid-state perovskite solar cell in 2012, organic-inorganic halide perovskite received great attention because of its superb opto-electronic properties. As a result, a power conversion efficiency (PCE) exceeding 22% was certified. Controlling grain size and grain boundary of perovskite layer perovskite is important for attaining high efficiency...
July 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28731629/stabilizing-the-performance-of-high-capacity-sulfur-composite-electrodes-by-a-novel-gel-polymer-electrolyte-configuration
#9
Marco Agostini, Du Hyun Lim, Matthew Sadd, Fasciani Chiara, Maria Assunta Navarra, Stefania Panero, Sergio Brutti, Aleksandar Matic, Bruno Scrosati
Increased pollution and the consequent increasing in global warming are drawing attention to the larger use of renewable energy sources such as solar or wind. However, the production of energy from most renewable sources is intermittent and thus relies on the availability of electrical energy storage systems with high capacity and at competitive cost. Lithium-sulfur batteries are among the most promising technologies in this respect due to a very high theoretical energy density (1675 mAh g-1) and that the active material, S, is abundant and cheap...
July 21, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28730737/vinylation-of-aryl-ether-lignin-%C3%AE-o-4-linkage-and-epoxides-with-calcium-carbide-via-c-o-bond-cleavage
#10
Yugen Zhang, Siew Ping Teong, Jenny Lim
Calcium carbide has been increasingly used as a sustainable, easy-to-handle, and low-cost feedstock in organic synthesis. Currently, methodologies of using calcium carbide as "solid acetylene" in synthesis are strictly limited to activation and reaction with X-H (X = C, N, O, S) bonds. Herein, a mild and transition metal-free protocol was developed for the vinylation of epoxides and aryl ether linkage (β-O-4 lignin model compound) with calcium carbide via C-O bond cleavage, forming valuable vinyl ether products...
July 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28727320/plasmonic-gold-nanostars-incorporated-into-high-efficiency-perovskite-solar-cells
#11
Munkhbayar Batmunkh, Thomas Macdonald, William Peveler, Abdulaziz Bati, Claire J Carmalt Claire J Carmalt, Ivan Parkin, Joseph George Shapter
Incorporating appropriate plasmonic nanostructures into photovoltaic (PV) systems is of great utility for enhancing photon absorption and thus improving device performance. Herein, the successful integration of plasmonic gold nanostars (AuNSs) into mesoporous TiO2 photoelectrodes for perovskite solar cells (PSCs) is reported. The PSCs fabricated with TiO2-AuNSs photoelectrodes exhibited a device efficiency of up to 17.72%, while the control cells without AuNSs showed a maximum efficiency of 15.19%. We attribute the origin of increased device performance to enhanced light absorption and suppressed charge recombination...
July 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28722818/c-h-carboxylation-of-aromatic-compounds-via-co2-fixation
#12
Junfei Luo, Igor Larrosa
Carbon dioxide (CO2) represents the most abundant and accessible carbon source in Earth. Thus the ability to transform CO2 into valuable commodity chemicals via construction of C-C bonds is an invaluable strategy. Carboxylic acids and derivatives, the main products obtained by carboxylation of carbon nucleophiles by reaction of CO2, have wide application in pharmaceuticals and advanced materials. Among the variety of carboxylation methods currently available, the direct carboxylation of C-H bonds with CO2 has attracted much attention due to its advantages from a step- and atom-economical point of view...
July 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28722277/in-situ-growth-and-wrapping-of-aminoanthraquinone-nanowires-within-3d-graphene-framework-as-high-performance-foldable-organic-cathode-for-lithium-ion-batteries
#13
Guanhui Yang, Fanxing Bu, Yanshan Huang, Yu Zhang, Imran Shakir, Yuxi Xu
Small conjugated carbonyl compounds are intriguing candidates of organic electrode materials because of their abundance, high theoretical capacity and adjustable molecular structure. However, their dissolution in aprotic electrolytes and poor conductivity eclipse them in terms of practical capacity, cycle life and rate capability. Herein, we report a foldable and binder-free nanocomposite electrode consisting of 2-aminoanthraquinone (AAQ) nanowires wrapping within three-dimensional (3D) graphene framework, which is prepared through antisolvent crystallization followed by a facile chemical reduction and self-assembly process...
July 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28722326/a-hydroxamic-acid-anchoring-group-for-durable-dye-sensitized-solar-cells-with-a-cobalt-redox-shuttle
#14
Tomohiro Higashino, Yuma Kurumisawa, Ning Cai, Yamato Fujimori, Yukihiro Tsuji, Shimpei Nimura, Daniel Packwood, Jaehong Park, Hiroshi Imahori
A hydroxamic acid group has been employed for the first time as an anchoring group for cobalt-based dye-sensitized solar cells (DSSCs). The porphyrin dye YD2-o-C8HA with the hydroxamic acid anchoring group exhibited a power conversion efficiency (η) of 6.4%, which is close to that of YD2-o-C8, a representative porphyrin dye with a conventional carboxylic acid one. More importantly, YD2-o-C8HA was found to be superior to YD2-o-C8 in terms of both binding ability to TiO2 and durability of cobalt-based DSSCs...
July 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28719095/a-new-perspective-on-transparent-wood-lignin-retaining-transparent-wood
#15
Yuanyuan Li, Qiliang Fu, Ramiro Rojas, Min Yan, Martin Lawoko, Lars Berglund
Optically transparent wood, combining optical and mechanical performance, is an emerging new material for light transmitting structures in buildings with the aim of reducing energy consumption. One of the main obstacles for transparent wood fabrication is delignification, where around 30 wt% of wood tissue is removed to reduce light absorption and refractive index mismatch. This step is time consuming and not environmentally benign. Meanwhile, lignin removal weakens the wood structure, limiting the fabrication of large structure...
July 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28718226/in-situ-preparation-of-novel-layered-spinel-microsphere-reduced-graphene-oxide-heterostructured-cathode-for-ultrafast-charge-discharge-li-ion-batteries
#16
Dong Luo, Shaohua Fang, Li Yang, Shin-Ichi Hirano
Although Li-rich layered oxides (LLOs) have the highest capacity of any cathodes used at present, their current rate capability is far from meeting the requirements of electric vehicles and smart grids. Here, a novel layered-spinel-microsphere/rGO (LS@rGO) heterostructured cathode is prepared by in-situ technique. This cathode is composed of a spinel phase, two layered structures and a few of reduced graphene oxide (rGO, 1.08 wt% of carbon). It delivers a considerably competitive capacity (145 mA h g-1) at an ultrahigh charge-discharge rate of 60 C (12 A g-1)...
July 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28714576/metal-organic-framework-derived-feco-n-doped-hollow-porous-carbon-nanocubes-for-electrocatalysis-in-acidic-and-alkaline-media
#17
Xinzuo Fang, Long Jiao, Shu-Hong Yu, Hai-Long Jiang
Metal-organic frameworks (MOFs) are ideal precursors/ templates for porous carbons with homogeneous doping of active components for energy storage and conversion applications. Herein, metalloporphyrinic MOFs, PCN-224-FeCo, with adjustable molar ratio of Fe(II) /Co(II) alternatively residing inside the porphyrin center, were employed as precursors to afford FeCo-N-doped porous carbon (denoted as FeCo-NPC) by pyrolysis. Thanks to the hollow porous structure, the synergetic effect between highly dispersed FeNx and CoNx active sites accompanied with a high degree of graphitization, the optimized FeCo2 -NPC-900 obtained by pyrolysis at 900 °C exhibits more positive half-wave potential, higher diffusion-limited current density, and better stability than the state-of-the-art Pt/C, under both alkaline and acidic media...
July 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28714562/a-multi-objective-optimisation-including-results-of-life-cycle-assessment-in-developing-bio-renewables-based-processes
#18
Daniel Helmdach, Polina Yaseneva, Parminder K Heer, Artur M Schweidtmann, Alexei Lapkin
A decision support tool has been developed, which uses global multi-objective optimisation based on: (i) the environmental impacts, evaluated within the framework of full life cycle assessment, and (ii) process costs, evaluated using rigorous process models. This approach is particularly useful in developing the bio renewable-based energy solutions and chemicals manufacturing, where multiple criteria must be evaluated and where the optimisation-based decision making process is particularly attractive. The framework is demonstrated using a case study of conversion of terpenes derived from bio-waste feedstocks into reactive intermediates...
July 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28714295/one-step-cationic-grafting-of-4-hydroxy-tempo-and-its-application-in-a-hybrid-redox-flow-battery-with-a-crosslinked-pbi-membrane
#19
Zhenjun Chang, Dirk Henkensmeier, Ruiyong Chen
By using a one-step epoxide ring-opening reaction between 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (4-hydroxy-TEMPO) and glycidyltrimethylammonium cation (GTMA+), we synthesize a cation-grafted TEMPO (g+-TEMPO) and study its electrochemical performance against a Zn2+/Zn anode in a hybrid redox flow battery. To conduct Cl- counter anions, a crosslinked methylated polybenzimidazole (PBI) membrane was prepared and placed between the catholyte and anolyte. Compared to 4-hydroxy-TEMPO, the positively charged g+-TEMPO exhibits enhanced reaction kinetics...
July 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28707784/decorating-separator-with-macro-mesoporous-co-n-c-for-highly-efficient-polysulfides-confinement-and-reutilization-in-lithium-sulfur-batteries
#20
Wen Hu, Yuichiro Hirota, Yexin Zhu, Nao Yoshida, Manabu Miyamoto, Tao Zheng, Norikazu Nishiyama
A macro/mesoporous Co-N-C-decorated separator is proposed to confine and reutilize migrating polysulfides. Endowed with desirable structure and synchronous lithio/sulfiphilic chemistry, macro/mesoporous Co-N-C interface manipulates large polysulfides adsorption uptake, high polysulfides adsorption kinetics, reversible electrocatalysis toward anchored-polysulfides redox, and facile charge transport. It significantly boosts simple MWCNT/S-70wt% cathode achieving high initial capacities (e.g. 1406 mAh g-1 at 0...
July 14, 2017: ChemSusChem
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