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ChemSusChem

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https://www.readbyqxmd.com/read/30221836/detrimental-effect-of-sintering-additives-on-conducting-ceramics-yttrium-doped-barium-zirconate
#1
Donglin Han, Shigeaki Uemura, Chihiro Hiraiwa, Masatoshi Majima, Tetsuya Uda
Y-doped BaZrO3 (BZY) is currently the most promising proton conductive ceramic-type electrolyte, showing perspective application in electrochemical devices, including fuel cells, electrolyzer cells. However, due to its refractory nature, sintering additives, such as NiO, CuO or ZnO was commonly added to reduce its high sintering temperature from 1600 oC to around 1400 oC. And even without deliberately adding the sintering additive, the NiO anode substrate provides another source of the sintering additive; that is, during the co-sintering process, NiO diffuses from the anode into the BZY electrolyte layer...
September 17, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30221480/preparation-and-reactivity-of-biomass-derived-dihydro-dioxins
#2
Nicholas James Westwood, James Montgomery, Karl Kempf, Daniel Miles-Barrett, Oxana Kempf, Tomas Lebl
The depolymerisation of the biopolymer lignin can give pure aromatic monomers but selective catalytic approaches remain scarce. Here, an approach was re-routed to deliver an unusual phenolic monomer. This monomer's instability proved challenging but a degradation study identified strategies to overcome this. Heterocycles and a useful synthetic intermediate were prepared. The range of aromatics available from the b-O-4 unit in lignin was extended.
September 17, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30218551/hierarchical-cobalt-borate-mxenes-hybrid-with-extraordinary-electrocatalytic-performance-in-oxygen-evolution-reaction
#3
Jiapeng Liu, Tao Chen, Peng Juan, Wenchao Peng, Yang Li, Fengbao Zhang, Xiaobin Fan
Oxygen evolution reaction (OER) is a key reaction of many renewable energy storage and conversion techniques. Developing efficient non-precious metal electrocatalysts for OER has attracted increasing attentions. Herein, we report a fast strategy to fabricate the hierarchical cobalt borates/Ti3C2Tx MXene (Co-Bi/Ti3C2Tx) through fast chemical reactions at room temperature. This interesting hierarchical structure is beneficial for the Co-Bi/Ti3C2Tx hybrid to expose more active sites, shorten the mass diffusion and charge transfer pathway upon electrochemical reaction...
September 15, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30215886/efficient-photoelectrochemical-water-oxidation-on-hematite-with-dual-cocatalysts-of-fluorine-doped-feooh-and-feniooh
#4
Jiujun Deng, Qingzhe Zhang, Kun Feng, Huiwen Lan, Jun Zhong, Mohamed Chaker, Dongling Ma
Effective cocatalyst is usually highly required for improving the performance of photoelectrochemical (PEC) water splitting. Here we report a fluorine-doped FeOOH (F:FeOOH) cocatalyst on a hematite photoanode, which can lower the onset potential with a large value of 140 mV and thereby significantly improve the PEC performance. Moreover, a more effective dual cocatalytic system is formed with the subsequent loading of FeNiOOH cocatalyst, which further causes a remarkable negative shift of the onset potential by 270 mV...
September 14, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30212605/the-alcohol-to-jet-conversion-pathway-for-drop-in-biofuels-techno-economic-evaluation
#5
Scott Geleynse, Kristin Brandt, Michael Wolcott, Manuel Garcia-Perez, Xiao Zhang
Alcohol-to-jet (ATJ) is a process for the conversion of alcohols to an alternative jet fuel blendstock based on catalytic steps historically utilized by the petroleum refining and petrochemical industry. This pathway provides a means for producing a sustainable alternative jet fuel (SAJF) from a wide variety of resources, offering a near term opportunity for alcohol producers to enter the SAJF market and for the aviation sector to meet growing SAJF demand. In this article, we review the technical background and evaluate selected variations of ATJ processes...
September 13, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30211984/development-of-anions-mixed-photocatalysts-with-wide-visible-light-absorption-bands-for-solar-water-splitting
#6
Junyan Cui, Can Li, Fuxiang Zhang
The rapid fossil-fuel consumption, severe environmental concerns, and growing energy demands call for the exploitation of environmentally friendly, recyclable new energy. Fuel-producing artificial system that directly converts solar energy into fuels by mimicking natural photosynthesis, is expected to achieve this goal. Among them, the conversion of solar energy to hydrogen energy through photocatalytic water splitting process over a particulate semiconductor is one of the most promising routes due to the advantages such as simplicity, cheapness and ease for large-scale production etc...
September 13, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30207640/oxygen-vacancy-engineering-in-sno2-based-anode-materials-toward-advanced-sodium-ion-batteries
#7
Dingtao Ma, Yongliang Li, Peixin Zhang, Zhiqun Lin
The high theoretical capacity of ~1400 mAh g-1 makes the SnO2 becoming the promising anode material for sodium-ion batteries (SIBs). However, the large volume expansion, poor intrinsic conductivity, as well as sluggish reaction kinetics have greatly hindered its practical application. In view of the controlled creation of oxygen vacancies (OVs) defects paly an effective role in modulating the intrinsic properties of SnO2, and related works concerning about the SIBs are still lacking. In this minireview, we start with a discussion about the failure mechanism of SnO2 electrode, then present an overview of recent progress in general synthesis of OVs-containing SnO2 materials and feasible detection of OVs in SnO2, as well as the introduction of OVs-containing SnO2-based anode materials applied for SIBs...
September 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30207639/single-site-ruthenium-pincer-complex-knitted-in-porous-organic-polymers-for-green-dehydrogenation-of-formic-acid-in-aqueous-medium
#8
Kuo-Wei Huang, Xinbo Wang, Eleanor Ang, Chao Guan, Qinggang Zhang, Wenting Wu, Pengxin Liu, Nanfeng Zheng, Daliang Zhang, Sergei Lopatin, Zhiping Lai
Owing to its capacity for reversible hydrogen storage, formic acid (FA) holds great promise as an energy carrier alternative to conventional fossil fuels systems. While the decomposition of FA to hydrogen (H2) and carbon dioxide (CO2) through homogeneous catalysis has been well-established, the selective and efficient dehydrogenation of FA by a robust heterogeneous catalyst remains a challenge. Herein, a novel heterogeneous ruthenium-pincer framework with single-atomic sites was prepared in one step by the direct knitting of a phosphorous-nitrogen PN3P-pincer ruthenium complex in a porous organic polymer...
September 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30207431/fabrication-of-mo-doped-strontium-cobaltite-perovskite-hybrid-supercapacitor-cell-with-high-energy-density-and-excellent-cycling-life
#9
Raj K Sharma, Anuj Kumar Tomar, Gurmeet Singh
Enriched with oxygen vacancies Mo-doped strontium cobaltite (SrCo0.9Mo0.1O3-δ, SCM) is synthesized as an oxygen anion-intercalated type charge storage material through sol-gel method. Thanks to the supplemented oxygen vacancies, good electrical conductivity and high ion diffusion coefficient that bestow SCM electrode with excellent specific capacitance (1223.34 F g-1) and specific capacity (168.88 mAh g-1) at 1 A g-1. The decisive constant (b-value) deduced for charge storage mechanism (low scan rate region) is nearly 0...
September 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30207091/molybdenum-based-co-catalysts-in-photocatalytic-hydrogen-production-categories-structures-and-roles
#10
Baojun Ma, Dekang Li, Xiaoyan Wang, Keying Lin
Photocatalytic hydrogen production using solar energy has attracted great interest around the world. The main challenges are high cost of the photocatalyst and low efficiency of photocatalytic hydrogen production. Co-catalyst, as a crucial component of a photocatalyst, is usually used to stimulate the photo-excited electrons transfer from the light-absorber to surface, and catalyzes the proton reduction reaction to form H2 molecule in water. However, most of the co-catalysts used in photocatalytic hydrogen production are noble metals , which are expensive and contradict to the low-cost industry demand...
September 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30204941/novel-stimuli-responsive-tannin-fe-iii-hybrid-microcapsules-as-demonstrated-by-the-active-release-of-an-anti-tuberculosos-agent
#11
Elisavet D Bartzoka, Heiko Lange, Claudia Crestini
A simple and facile strategy for the creation of ferric tannin micro-capsules around a liquid, non-sacrificial core is described. The assembly of the capsules occurs rapidly once ferric tannin complexes are subjected to an ultrasonic treatment. The driving forces for the rapid capsule assembly resides on a strategy of adding ferric ions in the initial emulsion that promotes shell formation and stability via well-known complexation effects. This is the first time that microcapsule assemblies of monomeric tannins like epigallocatechin-3-O-gallate is demonstrated, reportedly unable to form dispersing microcapsules in the absence of a templating metal...
September 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30204304/environmentally-and-industrially-friendly-recycling-of-platinum-nanoparticles-through-electrochemical-dissolution-electrodeposition-in-acid-free-dilute-acidic-electrolytes
#12
Raghunandan Sharma, Sašo Gyergyek, Shuang Ma Andersen
A process to recycle platinum from industrial waste, for example, spent catalysts from polymer fuel cells and electrolyzers, through potentiodynamic dissolution along with potentiostatic electrodeposition in dilute acidic/acid-free baths has been explored. During potentiodynamic dissolution, owing to Ostwald ripening, redeposition of the dissolved Pt species on source nanoparticles becomes significant, leading to lower overall dissolution efficiency. Alternatively, high concentrations of Pt-complexing agents (e...
September 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30203918/biotic-and-abiotic-synthesis-of-renewable-aliphatic-polyesters-from-short-building-blocks-obtained-from-biotechnology
#13
Thibaud Debuissy, Eric Pollet, Luc Averous
Biobased polymers have seen their attractiveness increase in the last decades thanks to significant development of biorefineries allowing access to a wide variety of biobased building blocks. Polyesters are one of the best examples of the development of biobased polymers since most of them have (i) now their monomers produced from renewable resources and (ii) are biodegradable. Currently, these polyesters are mainly produced using traditional chemical catalysts and harsh conditions, but recently greener pathways using nontoxic enzymes as biocatalysts and mild conditions have shown a great potential...
September 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30199610/ultrahigh-content-nitrogen-doped-micropore-dominated-and-morphology-evolution-carbon-materials-as-high-performance-supercapacitor
#14
De-Gao Wang, Huan Wang, Yi Lin, Guipeng Yu, Min Song, Wenbin Zhong, Guichao Kuang
Nitrogen doped carbon-based materials including nanocarbons, graphene and conductive polymers are impressive in the application of supercapacitor electrodes. However, ultrahigh nitrogen contents, micropore dominated and morphology evolution carbonaceous electrodes have not achieved until now which are crucial for supercapacitor. Herein, we prepare a novel fumaronitrile (FUM) derived covalent triazine framework (FUM-CTF) and activated it by KOH at different temperature to obtain corresponding carbon materials, which were used as supercapacitor electrode materials...
September 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30198638/a-facile-route-toward-the-synthesis-of-ethyl-4-ethoxy-pentanoate-in-high-yield-reductive-etherification-of-ethyl-levulinate-in-ethanol-on-pd-sio2-c-catalysts
#15
Qianqian Cui, Yinshuang Long, Yun Wang, Haihong Wu, Yejun Guan, Peng Wu
Facile synthesis of biomass-derived ethers useful as biofuels or biofuel-additives has attracted great attention. We have recently reported the synthesis of a novel etherified ester ethyl-4-ethoxy pentanoate (EEP) from gamma-valerolactone (GVL) in ethanol catalyzed by H-Beta zeolite. In this continuous study, we report an alternative route to prepare EEP in high yield by reductive etherification of ethyl levulinate (EL) in ethanol at 140 °C under 0.5 MPa H2 with silica modified Pd/C catalyst. The ether production likely follows a tandem acetalization-hydrogenolysis process with ethyl-4,4-diethoxy pentanoate (EDEP) as intermediate...
September 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30193013/interface-engineered-li7la3zr2o12-based-garnet-solid-electrolytes-with-suppressed-li-dendrite-formation-and-enhanced-electrochemical-performance
#16
Zhaoshuai Zhang, Long Zhang, Yanyan Liu, Hongqiang Wang, Chuang Yu, Hong Zeng, Li-Min Wang, Bo Xu
Large grain boundary resistance, Li dendrite suppression, and interfacial resistance of electrode/Li are three major issues against garnet-based solid electrolytes. Herein, we propose an interfacial architecture engineering by incorporating BMP-TFSI ionic liquid into the garnet oxide. The "soft" consecutive BMP-TFSI coating layer with no added Li-salt raises a conducting network facilitating Li+ transport and thus changes the ion conduction mode from point contacts to face contacts; a compacted microstructure to suppress the Li dendrite growth; a good interfacial compatibility and interfacial wettability toward metallic Li...
September 7, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30191682/mechanistic-study-of-the-synergy-between-iron-and-transition-metals-towards-the-oxygen-evolution-reaction
#17
Luo Gong, Jia Rui Koh, Boon Siang Yeo
We present here a study of the synergy between Fe and six transition metals (Ti, Co, Ni, Cu, Ag, Au), and how their M-Fe oxides electrocatalyzed the oxygen evolution reaction (OER). Measurements were made using the metal disks as working electrodes, with Fe3+ ions added to the 1 M KOH electrolyte. The surfaces of the metal disks were found oxidized after OER. Fe interacted synergistically with all metal oxide layers, except for that of Ti, to give enhanced catalysis for OER. At an overpotential = 400 mV, the current densities exhibited by the Ni and Ag disks in Fe ions-spiked electrolyte increased by 253 and 132 times respectively, while it was 20-30 times for the Co and Cu disks (compared to OER in pure KOH at η = 400 mV)...
September 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30188012/an-energy-efficient-one-pot-swelling-esterification-method-to-prepare-cellulose-nanofiber-with-uniform-diameter
#18
Yang Song, Wei Chen, Xun Niu, Guigan Fang, Huihua Min, Hui Pan
An energy efficient method has been developed to prepare 3-5 nm wide carboxyl-functionalized cellulose nanofiber (CNF) from pulp fiber via a simple one-pot swelling followed by esterification process. Tetrabutylammonium acetate (TBAA)/dimethyl sulfoxide (DMSO) binary solvent is used as the swelling agent and the esterification medium admixed with maleic anhydride. All steps are performed under room temperature and no post-mechanical treatment is needed. The highly efficient defibrillation of pulp fiber to CNF is believed due to two factors: 1) swelling in TBAA/DMSO effectively loosens the structure of cellulose supermolecules by breaking the intra- and inter-hydrogen bonds between cellulose chains; and 2) the carboxyl groups grafted on the cellulose molecules by esterification prohibit the reformulation of hydrogen bonds between cellulose chains and therefore stabilize the disperse CNF with uniform diameter in the solution...
September 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30180302/electrode-edge-effects-and-failure-mechanism-of-lithium-metal-batteries
#19
Hongkyung Lee, Shuru Chen, Xiaodi Ren, Abraham Martinez, Vaithiyalingam Shutthanandan, Murugesan Vijayakumar, Kee Sung Han, Qiuyan Li, Jun Liu, Wu Xu, Ji-Guang Zhang
Lithium (Li) metal with very high specific capacity makes it one of the ideal anode for high energy batteries. However, Li dendrite growth and the formation of isolated (or "dead") Li during repeated Li plating/stripping processes lead to its low Coulombic efficiency (CE). In this work, we discovered for the first time that electrode edge effects play an important role on the failure of Li metal batteries. The "dead" Li formed on the edge of Cu substrate was systematically investigated through scanning electron microscopy, energy dispersive X-ray spectroscopy, and two-dimensional X-ray photoelectron spectroscopy...
September 4, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30180299/diverse-surface-functional-groups-and-electrochemical-behavior-in-dimethyl-sulfoxide-delaminated-ti3c2tx-mxene
#20
Aniu Qian, Jung Yong Seo, Hu Shi, Jin Yong Lee, Chan-Hwa Chung
Functionalized groups in two-dimensional Ti3C2Tx MXene are considered to be an important factor influencing electrochemical performance in many applications involving energy storage, electrochemical sensors, and water purifications. However, after the dimethyl sulfoxide (DMSO) delamination, the effect on surface structures of Ti3C2Tx are still unclear and no systematical reports on capacitive behavior. Herein, we performed the experiments and theoretical calculations to confirm the relationship among different surface structures, the DMSO-delamination effect, and electrochemical behaviors on the DMSO-delaminated Ti3C2Tx...
September 4, 2018: ChemSusChem
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