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ChemSusChem

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https://www.readbyqxmd.com/read/28220997/highly-stable-sr-free-cobaltite-based-perovskite-cathodes-directly-assembled-on-a-barrier-layer-free-y2-o3-zro2-electrolyte-of-solid-oxide-fuel-cells
#1
Na Ai, Na Li, William D A Rickard, Yi Cheng, Kongfa Chen, San Ping Jiang
Direct assembly is a newly developed technique in which a cobaltite-based perovskite (CBP) cathode can be directly applied to a barrier-layer-free Y2 O3 -ZrO2 (YSZ) electrolyte with no high-temperature pre-sintering steps. Solid oxide fuel cells (SOFCs) based on directly assembled CBPs such as La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ show high performance initially but degrade rapidly under SOFC operation conditions at 750 °C owing to Sr segregation and accumulation at the electrode/electrolyte interface. Herein, the performance and interface of Sr-free CBPs such as LaCoO3-δ (LC) and Sm0...
February 21, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28218821/co2-catalysis
#2
EDITORIAL
Arjan W Kleij, Michael North, Atsushi Urakawa
Out of thin air: In this Editorial, the Guest Editors introduce a Special Issue on Carbon Dioxide Conversion Catalysis, discuss its importance in modern chemical processes, and highlight a few examples of its use in industry, such as the synthesis of cyclic carbonates and the conversion of CO2 into fuels.
February 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28218500/an-improved-strategy-for-the-synthesis-of-ethylene-glycol-via-oxamate-mediated-catalytic-hydrogenation
#3
Anilkumar Satapathy, Sandip T Gadge, Bhalchandra Mahadeo Bhanage
Present study reports an improved approach for the preparation of ethylene glycol (EG) by using carbon monoxide as C1 chemical via oxidative carbonylation and hydrogenation sequence. In the first step oxamates have been synthesized by oxidative cross double carbonylation of piperidine and ethanol using Pd/C catalyst under phosphine ligand-free conditions and subsequently hydrogenated by Milstein catalyst. The presented stepwise oxamate-mediated coupling provides the basis for a new strategy for synthesis of EG by selective upgrading of C1 chemicals...
February 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28199779/mechanoapi-ils-pharmaceutical-ionic-liquids-obtained-via-mechanochemical-synthesis
#4
Inês Martins, Conceição Oliveira, Hermínio Diogo, Luís Branco, Teresa Duarte
We report here, for the first time, an alternative, efficient and greener synthetic strategy for the preparation of pharmaceutical ionic liquids using mechanochemistry (MechanoAPI-ILs). Six new API-ILs based on gabapentin and L-glutamic acid were successfully synthesized and characterized pointing out that mechanochemistry is a challenging and very promising synthetic strategy. Results compare both the new and the classical approach and clearly show the advantages of the new method. This technique has shown to be faster, "solvent free", reproducible, selective and lead to higher yields...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28199064/systematic-molecular-design-of-ketone-derivatives-of-aromatic-molecules-for-lithium-ion-batteries-first-principles-density-functional-theory-modelling
#5
Jong Hoo Park, Tianyuan Liu, Ki Chul Kim, Seung Woo Lee, Seung Soon Jang
The thermodynamic and electrochemical redox properties for a set of ketones derivatives of phenalenyl and anthracene are investigated to assess their potential application for positive electrode materials in rechargeable lithium-ion batteries. Using the first-principles density functional theory (DFT) method, we find that 1) the thermodynamic stabilities of ketone derivatives are strongly dependent on the distribution of the carbonyl groups and 2) the redox potential is increased with increasing the number of the incorporated carbonyl groups: the highest values are 3...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28198594/interfacial-engineering-of-perovskite-solar-cells-by-employing-a-hydrophobic-copper-phthalocyanine-derivative-as-hole-transporting-material-with-improved-performance-and-stability
#6
Ze Yu, Xiaoqing Jiang, Jianbo Lai, Yuchen Zhang, Maowei Hu, Ning Lei, Dongping Wang, Xichuan Yang, Licheng Sun
In high-performance perovskite solar cells (PSCs), hole-transporting materials (HTMs) play important roles in extracting and transporting the photo-generated holes from the perovskite absrorber to the cathode, thus reducing unwanted recombination losses and enhancing the photovoltaic performance. Herein, solution-processable tetra-4-(bis(4-tert-butyl)phenyl)amino)phenoxy-substituted copper phthalocyanine (CuPc-OTPAtBu) has been synthesized and explored as a HTM in PSCs. The optical, electrochemical and thermal properties are fully characterized for this organic metal complex...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28198593/electrochemical-behavior-of-pedot-lignin-in-ionic-liquid-electrolytes-suitable-cathode-electrolyte-system-for-sodium-batteries
#7
Nerea Casado, Matthias Hilder, Cristina Pozo-Gonzalo, Maria Forsyth, David Mecerreyes
Biomass derived polymers, such as lignin, contain redox quinone/hydroquinone redox moieties that can be used to store charge. Composites based on the biopolymer lignin and several conjugated polymers have shown good charge storage properties. However, their performance has been just studied in acidic aqueous media limiting the applications mainly to supercapacitors. Here we show that PEDOT/Lignin biopolymers are electroactive in aprotic ionic liquids and we move a step further by assembling sodium full cell batteries using PEDOT/Lignin as electrode material and ionic liquid electrolytes...
February 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28195674/solvent-and-halogen-free-modification-of-biobased-polyphenols-to-introduce-vinyl-groups-versatile-aromatic-building-blocks-for-polymer-synthesis
#8
Antoine Duval, Luc Averous
Various biobased polyphenols (lignins and condensed tannins) were derivatized with vinyl ethylene carbonate, a functional cyclic carbonate, to obtain multifunctional aromatic polymers carrying vinyl groups. The reaction was optimized on a condensed tannin and soda lignin. In both cases, a full conversion of the phenol groups is achieved in only 1 h at 150 °C, without solvent and with K2CO3 as cheap and safe catalyst. This reaction was later applied to other condensed tannins and technical lignins (Kraft and organosolv), showing only little dependence on the chemical structure of the polyphenols...
February 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28195423/flexible-asymmetric-threadlike-supercapacitors-based-on-ternary-nico2se4-nanosheet-and-nico2o4-ppy-electrodes
#9
Qiufan Wang, Yun Ma, Yunlong Wu, Daohong Zhang, Menghe Miao
Flexible threadlike supercapacitors having improved performance are needed for many wearable electronics applications. Here we report a high performance flexible asymmetric all-solid-state threadlike supercapacitor with a NiCo2Se4 positive electrode and a NiCo2O4@PPy negative electrode. The as-prepared electrodes display outstanding volume specific capacitance (14.2 F/cm3) and excellent cycling performance (94% retention after 5000 cycles at 0.6 mA) owing to their nanosheet and nanosphere structures. The asymmetric all-solid-state threadlike supercapacitor expanded the voltage window from 0-1...
February 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28195433/enzyme-immobilized-nanoporous-carbons-derived-from-metal-organic-framework-a-new-support-for-biodiesel-synthesis
#10
Li-Hao Liu, Yung-Han Shih, Wan-Ling Liu, Chia-Her Lin, Hsi-Ya Huang
In this study, nanoporous carbon (NPC) derived from metal-organic framework (MOF) was used as support for the immobilization of Burkholderia cepacia lipase. The decorated aluminum oxide within the mesoporous NPC facilitated the enzyme loading efficiency as well as catalytic ability for transesterification of soybean oil thus making it green and sustainable technique for industrial application.
February 13, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28190293/a-simple-and-mild-approach-for-the-synthesis-of-p-xylene-from-bio-based-2-5-dimethyfuran-by-metal-triflates-in-ionic-liquids
#11
Lingli Ni, Jiayu Xin, Huixian Dong, Xingmei Lu, Xiaomin Liu, Suojiang Zhang
The production of aromatic platform chemicals from biomass-derived feedstocks is of great importance in biomass conversion. However, developments of effective routes with simple steps and mild conditions are still challenging. In this work, we reported a novel route to directly synthesize p-xylene from 2,5-dimethylfuran and acrylic acid by Sc(OTf)3 in [Emim]NTf2 at mild conditions, overall 63% selectivity of p-xylene and 78% selectivity of aromatics were obtained at 90% conversion of 2,5-dimethylfuran by enhancing the dehydration and introducing an extra one-pot decarboxylation process...
February 11, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28188690/interconnected-network-of-shell-core-co-bi-pi-cop-for-efficient-water-oxidation-electrocatalysis-under-near-neutral-conditions
#12
Xuping Sun
Developing earth-abundant electrocatalysts for efficient and stable water oxidation under near neutral conditions is of great importance but still remains a key challenge. In this Communication, we demonstrate the development of an interconnected network of shell-core Co-Bi-Pi@CoP via anodic polarization of CoP nanoarray in potassium borate aqueous electrolyte (KBi). This 3D Co-Bi-Pi@CoP exhibits super high catalytic activity for water oxidation at pH 9.2 and needs overpotential of only 410 mV to drive a geometrical catalytic current density of 10 mA cm-2, with a high turnover frequency of 819 h-1 at overpotential of 610 mV...
February 11, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28186391/a-sustainable-one-pot-two-enzymes-synthesis-of-naturally-occurring-arylalkyl-glucosides
#13
Ivan Bassanini, Jana Krejzova, Walter Panzeri, Daniela Monti, Vladimir Kren, Sergio Riva
A sustainable, convenient and scalable one-pot two-enzymes method for the glucosylation of arylalkyl alcohols has been developed. The reaction scheme is based on a transrutinosylation catalyzed by a rutinosidase from A. niger using the cheap commercially available natural flavonoid rutin as glycosyl donor, followed by a selective 'trimming' of the rutinoside unit catalyzed by a rhamnosidase from A. terreus. The process has been validated with the syntheses of several natural bioactive glucosides, that could be isolated in up to 75 % yield avoiding silica gel chromatography...
February 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28177581/harvesting-hydrogen-gas-from-air-pollutants-with-an-un-biased-gas-phase-photo-electrochemical-cell
#14
Sammy W Verbruggen, Myrthe Van Hal, Tom Bosserez, Jan Rongé, Birger Hauchecorne, Johan A Martens, Silvia Lenaerts
The concept of an all-gas-phase photo-electrochemical cell (PEC) producing hydrogen gas from volatile organic contaminated gas and light is presented. Without applying any external bias, organic contaminants are degraded and hydrogen gas is produced in separate electrode compartments. The system works most efficiently with organic pollutants in inert carrier gas. In the presence of oxygen gas, the cell performs less efficiently but still significant photocurrents are generated, showing the cell can be run on organic contaminated air...
February 8, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28177578/feasibility-of-a-supporting-salt-free-non-aqueous-redox-flow-battery-utilizing-ionic-active-materials
#15
Jarrod Milshtein, Sydney Fisher, Tanya Breault, Levi Thompson, Fikile Brushett
Non-aqueous redox flow batteries (NAqRFBs) are promising devices for grid-scale energy storage, however, high projected prices could limit commercial prospects. One price reduction route is to minimize or eliminate the expensive supporting salts typically employed in NAqRFBs. We demonstrate the feasibility of a flow cell operating in the absence of supporting salt, utilizing ionic active species. These ionic species possess high conductivities in acetonitrile (12 - 19 mS cm-1), and cycle at 20 mA cm-2 with energy efficiencies (> 75%) comparable to state-of-the-art NAqRFBs employing high concentrations of supporting salt...
February 8, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28169496/pdaucu-nanobranch-as-self-repair-electrocatalyst-for-oxygen-reduction-reaction
#16
Hongyu Gong, Xuecheng Cao, Fan Li, Yue Gong, Lin Gu, Rafael Gregorio Mendes, Mark H Rummeli, Peter Strasser, Ruizhi Yang
During start-up and shut-down operations of fuel cells, high potential is inevitably experienced at cathode, which leads to the deterioration of electrocatalyst for oxygen reduction reaction. The design of catalysts that can repair themselves under severe conditions has been identified as a primary challenge for fuel cells. Herein, self-supported PdAuCu branched nanostructure is synthesized by a hydrothermal method. By smartly utilizing the high potential treatment, the activity of PdAuCu is significantly enhanced due to the synergistic effect between the Pd and Cu (Ⅱ) generated by high potential treatment...
February 7, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28168850/predictive-guide-for-collective-co2-adsorption-properties-of-mg-al-mixed-oxides
#17
Hyuk Jae Kwon, Soonchul Kwon, Jeong Gil Seo, In Sun Jung, You-Hwan Son, Chan Hyun Lee, Ki Bong Lee, Hyun Chul Lee
Although solid adsorption process offers attractive benefits to reduce energy demands and penalties compared with liquid absorption process, there are still pressing needs of solid adsorbents for high adsorption capacity, thermal efficiency and energy-intensive regeneration in gas treatment processes. Here, we report a CO2 adsorption capacity for the layered double oxides (LDOs), as one of attractive solid adsorbents, with asymmetric volcano-type correlation with respect to the relative crystallinity. Furthermore, we propose new collective adsorption properties, which are adsorption capacity, adsorptive energy and charge transfer amount based on the adsorbent weight, driven from density functional theory (DFT) calculations and measured surface areas...
February 7, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28165202/supported-molybdenum-catalysts-for-the-deoxydehydration-of-1-4-anhydroerythritol-into-2-5-dihydrofuran
#18
Lennart Sandbrink, Klaus Beckerle, Isabell Meiners, Rebecca Liffmann, Khosrow Rahimi, Jun Okuda, Regina Palkovits
Efficient deoxygenation strategies are crucial for the valorization of renewable feedstocks. Deoxydehydration (DODH) enables the direct transformation of two adjacent hydroxyl groups into a double bond. Supported molybdenum-based catalysts were utilized for the first time in DODH. MoOx/TiO2 possesses superior catalytic activity compared to common molybdenum salts. The catalyst efficiently converted 1,4-anhydroerythritol into 2,5 dihydrofuran in the presence of 3-octanol as reducing agent showing high reproducibility and stability...
February 6, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28165200/selective-production-of-2-methylfuran-by-gas-phase-hydrogenation-of-furfural-on-copper-incorporated-by-complexing-to-mesoporous-silica-catalysts
#19
Carmen Pilar Jiménez-Gómez, Juan A Cecilia, Ramón Moreno-Tost, Pedro Maireles-Torres
Copper species have been incorporated to a mesoporous silica by complexing with amino group of dodecylamine molecules, used as structure-directing agent in the synthesis. A series of Cu/SiO2 catalysts, with copper loadings from 2.5 to 20 wt%, has been synthesized and evaluated in the gas phase hydrogenation of furfural. The most suitable catalytic performance, in terms of 2-methylfuran yield, has been found for intermediate copper content (10 wt%). In this sense, the 10Cu-MS catalyst, at a reaction temperature of 210ºC, after 5 h of time-on-stream, exhibits a 2-methylfuran yield higher than 95 mol%, with a H2:FUR molar ratio of 11...
February 6, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28165198/catalytic-biodiesel-production-mediated-by-amino-acid-based-protic-salts
#20
Jingbo Li, Zheng Guo
Hetero-/homo-geneous acid catalysts are effective catalysts for biodiesel produced from oils containing high free fatty acids. The protic salts synthesized from natural amino acids were examined for their catalytic activity and efficiency for esterification of oleic acid after structural identification and characterization. The melting points of the protic salts were measured. In the esterification reaction of oleic acid with methanol, [Asp][NO3] performed the best, correlating to its higher Hammett acidity...
February 6, 2017: ChemSusChem
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