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ChemSusChem

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https://www.readbyqxmd.com/read/28646521/enhancing-perovskite-electrocatalysis-of-solid-oxide-cells-through-controlled-growth-of-nanoparticles
#1
Bin Hua, Meng Li, Yi-Fei Sun, Jian-Hui Li, Jing-Li Luo
Perovskite oxides have received a great deal of attentions as promising electrodes in both solid oxide fuel cells (SOFCs) and solid oxide electrolyzer cells (SOECs) because of their reasonable reactivity, impurity tolerance, tunable property, etc. Particular explorations are still required for advancing the perovskite electrodes, which normally suffer from slow kinetics in electrocatalysis. In the past decades, several experimental studies have developed new classes of perovskites with advanced characteristics and electrode kinetics at technical levels...
June 24, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28644559/evaluating-dihydroazulene-vinylheptafulvene-photoswitches-for-solar-energy-storage-applications
#2
Zhihang Wang, Jonas Udmark, Karl Börjesson, Rita Rodrigues, Anna Roffey, Maria Abrahamsson, Mogens B Nielsen, Kasper Moth-Poulsen
Efficient solar energy storage is a key challenge in striving towards a sustainable future. For this reason, molecules capable of solar energy storage and release through valence isomerization, so-called Molecular Solar Thermal energy storage (MOST), have been investigated. Here, we evaluate the energy storage potential through the photoconversion of the dihydroazulene-vinylheptafulvene (DHA/VHF) photo-thermal couple. The robust nature of this system has been determined through multiple energy storage and release cycles at elevated temperatures in three different solvents...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28644517/quantitative-insights-into-the-fast-pyrolysis-of-extracted-cellulose-hemicelluloses-and-lignin
#3
Marion Carrier, Michael Windt, Bernhard Ziegler, Jörn Appelt, Bodo Saake, Dietrich Meier, Anthony Bridgwater
The transformation of lignocellulosic biomass into bio-based commodity chemicals is technically possible. Among thermochemical processes, fast pyrolysis, a relatively mature technology that has now reached the commercial level, produces a high yield of an organic-rich liquid stream. Despite the recent efforts in elucidating the degradation paths of biomass pyrolysis, the selectivity and recovery rates of bio-compounds remain low. In an attempt to clarify the general degradation scheme of biomass fast pyrolysis and provide a quantitative insight, this study has combined the use of fast pyrolysis micro-reactors, spectrometric techniques and mixtures of unlabelled and Carbon-13 enriched materials...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643934/comprehensive-insights-into-the-thermal-stability-biodegradability-and-combustion-chemistry-of-pyrrolidinium-based-ionic-liquids
#4
Gebrekidan Gebreselassie Eshetu, Sangsik Jeong, Pascal Pandard, Amandine Lecocq, Guy Marlair, Stefano Passerini
The use of ionic liquids (ILs) as advanced electrolytes components in electrochemical energy storage devices is one of the most appealing and emerging options. However, though ILs are hailed as safer and eco-friendly electrolytes, overcoming the limitations imposed by the highly volatile/combustible carbonate based electrolytes, the full scale and precise appraisal of their overall safety levels under abuse conditions still need to be fully addressed. With the aim of providing the entreated level of information on the thermal and chemical stabilities as well as actual fire hazards, we embarked on a detailed investigation of the short - and long - term thermal stabilities, bio-degradability and combustion behaviour of various pyrrolidinium ([Pyr1A] +)-based ILs, enlisting different alkyl chain lengths, [Pyr1A] + (A=3-10), counter-anions ([TFSI]-/[FSI]-/[BETI]-), cations (Pyr14+/Pyr12O1+) and the effect of doping with Li salts (e...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643864/hydroxyacetone-a-glycerol-based-platform-for-electrocatalytic-hydrogenation-and-hydrodeoxygenation-processes
#5
Waldemar Sauter, Olaf Lennart Bergmann, Uwe Schröder
Here we propose the use of hydroxyacetone, a dehydration product of glycerol, as a platform for the electrocatalytic synthesis of acetone, 1,2-propanediol and 2-propanol. 11 non-noble metals were investigated as electrode materials in combination with three different electrolyte compositions towards the selectivity, Coulomb efficiency (CE) and reaction rates of the electrocatalytic hydrogenation (formation of 1,2-propanediol) and hydrodeoxygenation (formation of acetone and propanol) of hydroxyacetone. With a selectivity of 84...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643863/design-of-iron-ii-pthalocyanine-fepc-derived-oxygen-reduction-electrocatalysts-for-high-power-density-microbial-fuel-cells
#6
Carlo Santoro, Rohan Gokhale, Barbara Mecheri, Alessandra D'Epifanio, Silvia Licoccia, Alexey Serov, Kateryna Artyushkova, Plamen Atanassov
Iron(II) Phthalocyanine (FePc) deposited onto two different carbonaceous supports was synthesized by the non-conventional pyrolysis-free method, studied in the reaction of oxygen reduction (ORR) in neutral media, incorporated in an air-breathing cathode structure and tested in operating microbial fuel cell (MFC) configuration. Rotating ring disk electrode (RRDE) analysis revealed high performances of the Fe-based catalysts compared with activated carbon (AC). It was shown that Black Pearls supported FePc (Fe-BP(N)) exhibits the highest performance in term of more positive onset, positive shift of half-wave potential and higher limiting as well as highest power density in operating MFC (243±7 μWcm-2) that was 33% higher than Fe-CNT(N) (182±5 μWcm-2)...
June 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28643471/molecular-self-assembly-fabrication-and-carrier-dynamics-of-stable-and-efficient-ch3nh3pb-1-x-snxi3-perovskite-solar-cells
#7
Jiandong Fan, Chong Liu, Hongliang Li, Cuilin Zhang, Wenze Li, Yaohua Mai
The Sn-based perovskite solar cells (PSCs) provide the possibility that swaps the Pb element toward toxic-free PSCs. Here, we innovatively employed a molecular self-assembly approach to obtain a series CH3NH3Pb(1-x)SnxI3 (0≤x≤1) perovskite thin films with full coverage. The optimized planar CH3NH3Pb0.75Sn0.25I3 PSCs with inverted structure was consequently realized with a maximum power conversion efficiency (PCE) over 14 %, which displayed a stabilized power output (SPO) over 12 % within 200 s at 0.6 V forward bias...
June 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28636780/nanoelectrical-and-nanoelectrochemical-imaging-of-pt-p-si-and-pt-p-si-electrodes
#8
Jingjing Jiang, Zhuangqun Huang, Chengxiang Xiang, Rakesh Poddar, Hans-Joachim Lewerenz, Kimberly M Papadantonakis, Nathan Lewis, Bruce Brunschwig
The interfacial properties of electrolessly deposited Pt nanoparticles (Pt-NP) on p-Si and p+-Si electrodes have been resolved on the nanometer scale using a combination of scanning probe methods. Atomic-force microscopy (AFM) showed highly dispersed Pt nanoparticles. Conductive AFM measurements showed that only about half of the particles exhibited measurable contact currents, with a factor of 10^3 difference in current. Local current-voltage measurements revealed a rectifying junction with a resistance of ≥ 10 MΩ at the Pt-NP/p-Si interface, while Pt-NP/p+-Si samples formed an Ohmic junction with a local resistance of ≥ 1 MΩ...
June 21, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28631405/a-perylene-based-polycyclic-aromatic-hydrocarbon-electron-donor-for-a-highly-efficient-solar-cell-dye
#9
Junting Wang, Heng Wu, Linrui Jin, Jing Zhang, Yi Yuan, Peng Wang
The continuing efforts of creating novel polycyclic aromatic hydrocarbons (PAHs) and exploiting them as the crucial building-blocks of organic donor-acceptor (D-A) dyes with excellent excited state features, should bring an unprecedented chance for the improvement of power conversion efficiency (PCE) of dye-sensitized solar cells (DSCs). In this paper we report a nonacyclic aromatic hydrocarbon, N-annulated benzoindenopentaphene (NBIP), which can be tethered with multiple solubilizing groups including one 2-hexyldecyl, one 2-hexyldecyloxy, and four 4-hexylphenyl substituents...
June 20, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28627762/quantitative-nmr-approach-to-optimize-the-formation-of-chemical-building-blocks-from-abundant-carbohydrates
#10
Sebastian Meier, Samuel Elliot, Søren Tolborg, Irantzu Sadaba Zubiri, Esben Taarning
The future role of biomass-derived chemicals relies on the formation of diverse functional monomers in high yields from carbohydrates. Recently, it has become clear that a series of α-hydroxy acids, esters and lactones can be formed from carbohydrates in alcohols and water using tin-containing catalysts such as Sn-Beta. These compounds are potential building blocks for polyesters with additional olefin and alcohol functionalities. We employ an NMR approach to identify, quantify and optimize the formation these building blocks in the chemocatalytic transformation of abundant carbohydrates by Sn-Beta...
June 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28627139/direct-electro-oxidation-of-dimethyl-ether-on-pt-cu-nanochains
#11
Bar Gavriel, Ronit Sharabi, Lior Elbaz
In this work, new catalyst for the direct electro-oxidation of dimethyl ether (DME) was synthesized and studied using an array of techniques. One of the most prominent catalysts for this reaction, platinum copper alloy (PtCu), was synthesized in an easy and low cost approach. Structural characterizations such as X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and elemental analysis revealed that the synthesized PtCu nanoparticles (3 nm on average), formed homogeneous NanoChains without aggregation of metallic platinum or copper...
June 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28627129/co-based-active-species-molecularly-immobilized-on-carbon-nanotubes-for-oxygen-reduction-reaction
#12
Sujin Kim, Dawoon Jang, Joonwon Lim, Junghoon Oh, Sang Ouk Kim, Sungjin Park
Hybrid systems that molecule-based active species are combined with nanoscale materials may offer valuable routes to enhance the catalytic performances for electrocatalytic reactions. Development of rationally designed, cost-effective efficient catalysts for oxygen reduction reaction (ORR) is a crucial challenge for fuel cell and metal-air battery applications. In this work, we report a novel hybrid ORR catalyst material synthesized by a well-defined reaction pathway between Co-based organometallic molecules and N-doped multiwalled carbon nanotubes (MWCNT) at room temperature...
June 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28621498/sustainable-production-of-o-xylene-from-biomass-derived-pinacol-and-acrolein
#13
Yancheng Hu, Ning Li, Guangyi Li, Aiqin Wang, Yu Cong, Xiaodong Wang, Tao Zhang
o-Xylene (OX) is a large-volume commodity chemical that is conventionally produced from fossil fuels. Herein, we report an efficient and sustainable two-step route to OX from biomass-derived pinacol and acrolein. In the first step, the phosphotungstic acid (HPW) catalyzed pinacol dehydration in 1-ethyl-3-methylimidazolium chloride ([Emim]Cl) selectively afforded 2,3-dimethylbutadiene. The high selectivity of this reaction can be ascribed to the H-bonding interaction between Cl- and the hydroxyl group of pinacol...
June 16, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28621064/sustainable-separations-of-c4-hydrocarbons-using-microporous-materials
#14
Stefania Tanase-Grecea, Mascha Gehre, Zhiyong Guo, Gadi Rothenberg
Petrochemical refineries must separate hydrocarbons mixtures on a large scale for the production of fuels and chemicals. Most often, these hydrocarbons are separated by distillation, which is extremely energy-intensive. This high energy cost can be mitigated by developing materials that can enable efficient adsorptive separation. In this critical review, we first outline the principles of adsorptive separation. We then examine the case for C4 separations using zeolites and metal-organic frameworks (MOFs). By analysing both experimental and theoretical studies, we outline the challenges and opportunities in C4 separation, with a focus on the separation mechanisms and structure-selectivity correlations...
June 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28618145/novel-solid-state-lithium-conductors-for-lithium-metal-batteries-based-on-electrospun-nanofibers-and-plastic-crystal-composites
#15
Yundong Zhou, Xiaoen Wang, Haijin Zhu, Masahiro Yoshizawa-Fujita, Yukari Miyachi, Michel Armand, Maria Forsyth, George W Greene, Jennifer M Pringle, Patrick Howlett
Organic ionic plastic crystals (OIPCs) are a class of solid-state electrolyte with good thermal stability, non-flammability, non-volatility and good electrochemical stability. When prepared in a composite with electrospun polyvinylidene fluoride (PVdF) nanofibers, a 1:1 mixture of the OIPC N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide and LiFSI produced a free-standing, robust solid state electrolyte. These high concentration Li-containing electrolyte membranes had a transference number of 0.37 (± 0...
June 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28613397/mechanochemical-ring-opening-polymerization-of-lactide-liquid-assisted-grinding-for-the-green-synthesis-of-poly-lactic-acid-with-high-molecular-weight
#16
Nuri Ohn, Jihoon Shin, Sung Sik Kim, Jeung Gon Kim
A mechanochemical polymerization of lactide is developed using ball milling. Mechanical energy from the collisions between the balls and the vessel efficiently promoted an organic-base-mediated metal- and solvent-free solid-state polymerization. Investigations on the parameters of the ball-milling synthesis revealed that the degree of lactide ring-opening polymerization could be modulated by the ball-milling time, vibration frequency, mass of the ball media, and liquid-assisted grinding. Especially, liquid-assisted grinding was found to be an important factor for achieving a high degree of mechanochemical polymerization...
June 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612980/copper-catalyzed-oxidative-dehydrogenative-c-sp3-h-bond-amination-of-cyclo-alkanes-using-nh-free-heterocycles-as-amine-sources
#17
Chang-Sheng Wang, Xiao-Feng Wu, Pierre H Dixneuf, Jean-Francois Soule
A copper-catalyzed oxidative C(sp3)-H/N-H coupling of NH-heterocycles with affordable (cyclo)alkanes was developed. This protocol involved C(sp3)-N bond formation via a radical pathway generated by a homolytic cleavage of di-tert-butyl peroxide and trapping of the radical(s) by copper catalysts. The reaction tolerated a series of functional groups, such as bromo, fluoro, ester, ketone, nitrile, methyl and methoxy. NH-free indoles, pyroles, pyrazoles, indazoles and benzotriazoles have been successfully N-alkylated...
June 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612494/enhanced-interfacial-charge-transfer-on-wo3-photoanode-by-molecular-iridium-catalyst
#18
Haili Tong, Yi Jiang, Qian Zhang, Jialing Li, Wenchao Jiang, Donghui Zhang, Na Li, Lixin Xia
The rational design of active photoanodes for photoelectrochemical (PEC) water splitting is crucial for future applications in sustainable energy conversion. A combination of catalysts with photoelectrodes is generally required to improve surface kinetics and suppress surface recombination. In this study, we present an iridium complex (Ir-PO3H2) modified WO3 photoanode (WO3+Ir-PO3H2) for PEC water oxidation. When the Ir-based molecular catalyst (Ir-PO3H2) is anchored to a WO3 electrode, the photoanode shows a significant improvement both in photocurrent and faradaic efficiency compared to bare WO3...
June 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612461/oxygen-vacancy-engineering-of-co3o4-nanocrystals-via-constructing-coupled-interface-with-metal-supports-for-promoting-water-oxidation-in-neutral-electrolyte
#19
Jun-Jun Zhang, Hong-Hui Wang, Tian-Jian Zhao, Ke-Xin Zhang, Xiao Wei, Xin-Hao Li, Shin-Ichi Hirano, Jie-Sheng Chen
Oxygen vacancies could help to capture oxygen-containing species and act as active centers for oxygen evolution reaction (OER). Unfortunately, effective methods for generating a rich amount of oxygen vacancies on the surface of various nanocatalysts are rather limited. In this work, we described an effective way to generate oxygen vacancy-rich surface of transition metal oxides, exemplified with Co3O4 here, simply by constructing highly coupled interface of ultra-fine Co3O4 nanocrystals and metallic Ti. Impressively, the amounts of oxygen vacancy on the surface of Ti@Co3O4 far surpassed the reported values of the Co3O4 modified even under highly critical conditions...
June 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612464/recent-advances-in-bismuth-based-nanomaterials-for-photoelectrochemical-water-splitting
#20
Swhetha S M Bhat, Ho Won Jang
In recent years bismuth based nanomaterials are drawing considerable interest as potential candidates for photoelectrochemical (PEC) water splitting due to their narrow band gap, nontoxicity and low cost. The unique electronic structure with well dispersed valance band comprising of Bi 6s and O 2p orbital in the bismuth based materials offers suitable band gap to harvest visible light. This review presents the significant advancements in exploiting bismuth based materials for solar water splitting. An overview of different strategies employed and new ideas adopted to improve the PEC performance are discussed for these materials...
June 13, 2017: ChemSusChem
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