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ChemSusChem

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https://www.readbyqxmd.com/read/30006949/inexpensive-but-highly-efficient-co-mn-mixed-oxide-catalysts-prepared-by-simple-solid-state-mixing-for-selective-oxidation-of-5-hydroxymethylfurfural-to-2-5-furandicarboxylic-acid
#1
Chunbao Charles Xu, Tirumala Venkateswara Rao Kasanneni, Jennifer Lorraine Rogers, Sadra Souzanchi, Luna Dessbesell, Madhumita Ray
This work demonstrated high activity of inexpensive Co-Mn mixed oxide catalysts for selective oxidation of 5-hydroxymethylfurfural (HMF) into 2, 5-furandicarboxylic acid (FDCA) - a sustainable alternative to terephthalate. The Co-Mn mixed oxide catalysts with different Co/Mn mole ratios were prepared simply by solid-state grinding; a low-cost and greener catalyst preparation method. The activity of these catalysts was evaluated for selective aerobic oxidation of HMF into FDCA in water solvent. Under the best reaction conditions (i...
July 13, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29998552/enhanced-base-free-formic-acid-production-from-co2-on-pd-g-c3n4-by-tuning-of-the-carrier-defects
#2
Cecilia Mondelli, Begoña Puértolas, Miriam Ackermann, Zupeng Chen, Javier Pérez-Ramírez
CO2 hydrogenation attracts increasing attention as a sustainable route to produce formic acid, a commodity and potential energy vector. Here, bifunctional catalysts comprising metal nanoparticles deposited on bulk graphitic carbon nitride were assessed under base free conditions, identifying supported Pd as the best performer. The catalyst productivity was enhanced by maximizing the edge defects of the g-C3N4 carrier, amino groups able to activate CO2, and by generating well-dispersed 5-nm Pd particles, required to split H2...
July 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29998518/towards-high-efficiency-hydrogen-production-through-the-in-situ-forming-well-dispersed-rhodium-nanoclusters-on-carbon-during-the-reaction-processes
#3
Min Hu, Mei Ming, Caili Xu, Yi Wang, Yun Zhang, Daojiang Gao, Jian Bi, Guangyin Fan
Rhodium (Rh)-based materials have been emerged as potential candidates for hydrogen revolution from electrolyzing water or ammonia borane (AB) hydrolysis. Nevertheless, most of the catalysts still suffer from the complex synthetic procedures combined with limited catalytic activity. Additionally, the facile syntheses of Rh catalysts with high efficiencies for both electrochemical water splitting and AB hydrolysis are still challenging. Herein, we develop a simple, green and mass-producible ion-adsorption strategy to produce Rh/C pre-catalyst...
July 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29992768/a-direct-ammonia-microfluidic-fuel-cell-using-nicu-supported-on-carbon-nanotube-as-electrocatalysts
#4
Hui Min Zhang, Yi Fei Wang, Yu Ho Kwok, Zu Cheng Wu, De Hua Xia, Dennis Y C Leung
This work demonstrates the use of NiCu/carbon nanotube (CNT) electrocatalyst prepared by hydrothermal method with different Ni: Cu mass ratios (70:30, 50:50 and 30:70) supported on CNT, which was studied about the electrochemical behavior of ammonia oxidation reaction and direct ammonia microfluidic fuel cell (DAMFC) performance. XRD and SEM-EDX showed the formation of NiCu alloy while TEM showed the particles size between 15-20 nm. Cyclic voltammetry and chronoamperometry showed that NiCu had higher catalytic activity than pure Ni and pure Cu, and NiCu oxyhydroxides was the activated substance...
July 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29989384/mixed-ionic-electronic-conduction-in-nife2o4-ce0-8gd0-2o2-%C3%AE-nanocomposite-thin-films-for-oxygen-separation
#5
Cecilia Solis, Fidel Toldra-Reig, Maria Balaguer, Simona Somacescu, Julio Garcia-Fayos, Elena Palafox, Jose M Serra
NiFe2O4 - Ce0.8Gd0.2O2-δ (NFO/CGO) nanocomposite thin films were prepared by simultaneously r.f. magnetron sputtering of both, NFO and CGO, ceramic targets. The aim is the growth of CO2 stable composite layers that combine the electronic and ionic conduction of the separate NFO and the CGO phases for oxygen separation applications. The effect of the deposition temperature on the films microstructure was studied in order to obtain high quality composite thin films. The ratio of both phases was changed by applying different power to each ceramic target...
July 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29989337/conversion-of-lignin-models-via-photoredox-catalysis
#6
Jian Zhang
One prominent goal of the 21st century is to develop a sustainable carbon-neutral biorefinery. Lignin is an important component of lignocellulosic biomass; however, it is currently underutilized due to its highly crosslinked, complex and randomly polymerized composition that cause a significant challenge to its depolymerization and valorization. Chemical catalytic approaches based on transition metals represent the primary research area to drive the degradation reactions. Recently, alternative photocatalytic strategies that employ the sustainable solar energy to initiate the transformation of lignin have started to emerge...
July 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29989331/getting-closer-to-absolute-molar-masses-of-technical-lignins
#7
Grigory Zinovyev, Irina Sulaeva, Stepan Podzimek, Dierk Rössner, Ilkka Kilpelainen, Ivan Sumerskii, Thomas Rosenau, Antje Potthast
Determination of molecular weight parameters of native and, in particular, technical lignins are based on size exclusion chromatography (SEC) approaches. No matter whether either conventional SEC with a refractive index detector and columns calibration or multi-angle light scattering (MALS) detection at 488 nm, 633 nm, 658 nm, or 690 nm i sused, all variants can be severely erroneous. The lack of calibration standards with high structural similarity to lignin impairs the quality of the molar masses determined by conventional SEC, and the typical fluorescence of (technical) lignins renders the corresponding MALS data rather questionable...
July 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29984904/recent-progress-on-tio2-nanomaterials-for-photocatalytic-applications
#8
Maryline Nasr, Cynthia Eid, Roland Habchi, Philippe Miele, Mikhael Bechelany
Environmental and energy problems have drawn much attention due to the rapid population growth and the accelerated economic development. For instance, photocatalysis, "a green technology", plays an important role in solar energy conversion owing to its potential to solve energy and environmental problems. Recently, many efforts have been devoted to improve the visible-light photocatalytic activity using titanium dioxide as photocatalyst due to its wide range of applications in energy and environment fields...
July 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29981253/ultrasonic-assisted-wet-chemistry-synthesis-of-ultrafine-sno2-nanoparticles-for-electron-transport-layer-in-perovskite-solar-cells
#9
Haiquan Shan, Ehsan Rezaee, Xin Leng, Xiang Wang, Qian Chen, ZongXiang Xu
Tin oxide (SnO2) has been recently employed as an efficient electron-transport layer (ETL) in perovskite solar cells (PSCs) and high power conversion efficiencies (PCEs) have been reported. However, it is still challenging to apply it through facile solution-based synthesis at low enough temperature (<150°C) to be compatible with the largescale module fabrication, especially for flexible devices. Here, we report a low temperature solution-based method for preparation of Tin(IV) oxide (SnO2) nanoparticles...
July 7, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29981244/coo-co-activated-porous-carbon-cloth-cathode-for-high-performance-lithium-sulfur-batteries
#10
Wenchen Ren, Wei Ma, Malik Muhammad Umair, Shufen Zhang, Bingtao Tang
Lithium-sulfur batteries are one of the most promising candidates for the next generation batteries because of its high theoretical specific capacity of 1675 mAh g-1. However, the dissolution of polysulfide would cause severe capacity fading during cycling. Herein, a 3D CoO/Co activated free-standing porous carbon fiber cloth (CoO/Co@PCF) is designed to suppress the polylsulfide dissolution. The polar CoO can anchor polysulfide via the Co-S ionic bonding and the pores can provide abundant active sites for the electrochemical reactions...
July 7, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29981207/facilely-synthesized-spiro-fluorene-9-9-phenanthren-10-one-in-d-a-d-hole-transporting-materials-for-perovskite-solar-cells
#11
Yih-Chun Chen, Shao-Ku Huang, Shao-Sian Li, Yao-Yu Tsai, Chih-Ping Chen, Yuan Jay Chang
This is the first report on donor-acceptor-donor (D-A-D) hole-transporting materials (HTMs) with spiro linkages in perovskite solar cells (PSCs). We have demonstrated two novel D-A-D-type HTMs with spiro[fluorene-9,9'-phenanthren-10'-one] as the core structure, which can be synthesized via a low-cost process in high yield. Compared to the incorporation of the conventional hole transport layer (HTL) of spiro-OMeTAD, the synthesis process is greatly simplified for D-A-D HTL materials, including a minimum number of purification processes...
July 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29979491/semiconducting-synthetic-melanin-based-organic-inorganic-hybrid-photoanodes-for-solar-water-oxidation
#12
Cheolmin Lee, Dasom Jeon, Sanghyun Bae, Hyunwoo Kim, Yujin Han, Yang Woo Lee, Jungki Ryu
We report the development of semiconducting melanin-based organic/inorganic hybrid photoanodes for solar water oxidation. Synthetic melanin thin-film incorporating polyoxometalate (POM) water oxidation catalysts (WOCs) is readily deposited on the surface of various n-type inorganic semiconductors (e.g., Fe2O3, BiVO4, and TiO2) by electropolymerization. The deposition of melanin and POM hybrid (MP) thin-film results in the remarkably improved performance of an underlying semiconductor photoanode for solar water oxidation with a significantly increased photocurrent density and decreased onset potential for water oxidation through the formation of melanin-based p-n heterojunction structure...
July 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29978953/immobilization-of-a-full-photosystem-in-the-large-pore-mil-101-metal-organic-framework-for-co2-reduction
#13
Xia Wang, Florian M Wisser, Jérôme Canivet, Marc Fontecave, Caroline Mellot-Draznieks
A molecular catalyst [Cp*Rh(4,4'-bpydc)]2+ and a molecular photosensitizer [Ru(bpy)2(4,4'-bpydc)]2+ (bpydc = bipyridinedicarboxylic acid) were successfully co-immobilized into the highly porous metal-organic framework MIL-101-NH2 upon easy post-synthetic impregnation. The Rh-Ru@MIL-101-NH2 composite allows the reduction of CO2 under visible light, while exhibiting remarkable selectivity with the exclusive production of formate. This Rh-Ru@MIL-101-NH2 solid represents the first example of MOFs functionalized with both a catalyst and a photosensitizer in a non-covalent fashion...
July 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29975819/%C3%A3-cyclodextrin-as-template-free-precursor-to-prepare-holey-c-doped-g-c%C3%A2-n%C3%A2-nanosheets-with-improved-charge-separation-for-efficient-visible-light-photocatalytic-hydrogen-generation
#14
Eliana Sousa Da Silva, Nuno M M Moura, Ana Coutinho, Goran Goran Dražić, Bruno M S Teixeira, Nikolai A Sobolev, Cláudia G Silva, M Graça P M S Neves, Manuel Prieto, Joaquim L Faria
A green, template-free easy-to-implement strategy giving access to holey g-C₃N₄ nanosheets doped with carbon is described. The protocol involves heating dicyandiamide with β-cyclodextrin (βCD) prior to polymerization. By this approach, the local symmetry of g-C3N4 skeleton is broken, thus yielding CxGCN (x corresponds to the initial amount of βCD used) with porous and a distorted structure. The electronic, emission, optical and textural properties of the best-performing material, C2GCN, are thus greatly modified as compared to bulk g-C₃N₄ (GCN)...
July 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29975458/a-cobalt-based-metal-organic-framework-as-cocatalyst-on-bivo4-photoanode-for-enhanced-photoelectrochemical-water-oxidation
#15
Kun Zhou, Wang Zhang, Rui Li, Xin Zhao, Zhong Chen, Adrian Wing-Keung Law
A metal-organic framework (MOF)-modified bismuth vanadate (BiVO4) photoanode is fabricated by an ultrathin sheet-induced growth strategy, where ultrathin cobalt oxide sheets act as metal source for the in-situ synthesis of Co-based MOF (Co2(bim)4) nanoparticles on the surface of BiVO4. Co2(bim)4 with small particle size and high dispersion can serve as a promising cocatalyst to accept holes transferred from BiVO4 and boost surface reaction kinetics for photoelectrochemical (PEC) water oxidation. The photocurrent density of a Co2(bim)4-modified BiVO4 photoanode can achieve 3...
July 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29975011/biomass-derived-surfactant-molecules-by-reacting-hmf-glycerol-and-fatty-alcohols-in-one-pot-process-with-heterogeneous-acid-catalysts-of-controlled-polarity
#16
Avelino Corma, Andrea Garcia Ortiz, Karen Arias, MAria Jose Climent, Sara Iborra
A new type of biomass derived nonionic surfactants have been obtained by reacting hydroxymethylfurfural (HMF), glycerol and fatty alcohols. For instance, 5-(octyloxymethyl)furfural glyceryl acetal can be obtained in a one pot process by etherification of HMF with fatty alcohols followed by acetalization with glycerol. For a successful solid catalyst, acidity and polarity have to be optimized to improve conversion, selectivity and catalyst deactivation, owing to the different adsorption characteristics of the reactant molecules...
July 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29969535/a-solvent-free-synthesis-of-lignin-derived-renewable-carbon-with-tunable-porosity-for-supercapacitor-electrodes
#17
Hoi Chun Ho, Ngoc A Nguyen, Kelly M Meek, David Martin Alonso, Sikander H Hakim, Amit K Naskar
Synthesis of multiphase materials from lignin, a biorefinery coproduct, offers limited success due to the inherent difficulty in controlling dispersion of these renewable hyperbranched macromolecules in the product or its intermediates. Effective use of the chemically reactive functionalities in lignin, however, enables tuning morphologies of the materials. Here, we bind lignin oligomer with a rubbery macromolecule followed by thermal crosslinking to form a carbon precursor with phase contrasted morphology at submicron scale...
July 3, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29968282/highly-efficient-cost-effective-and-safe-sodiation-agent-for-high-performance-sodium-batteries
#18
Shanmukaraj Devaraj, Katja Kretschmer, Tuhin Sahu, Weizhai Bao, Teofilo Rojo, Guoxiu Wang, Michel Bernard Armand
The development of sodium-ion batteries has been hindered so far by large irreversible capacity of hard carbon anodes and other anode materials in the initial few cycles, as sodium emanating from cathode materials is consumed in the formation of solid electrolyte Interface (SEI) and irreversibly trapped in anodes. Herein we report the successful synthesis of an environmentally benign and cost effective sodium salt (Na2C4O4) that could be applied as additives in cathodes to solve huge irreversible capacity issues of anodes in sodium-ion batteries...
July 3, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29968345/effects-of-sugars-furans-and-their-derivatives-on-hydrodeoxygenation-of-biorefinery-lignin-rich-wastes-to-hydrocarbons
#19
Hongliang Wang, Yuhua Duan, Qiang Zhang, Bin Yang
Hydrodeoxygenation of biorefinery lignin-rich wastes to jet fuel hydrocarbons offers a significant opportunity for enhancing the overall operational efficiency, carbon conversion efficiency, economic viability, and sustainability of biofuels production. However, these wastes usually mainly contain lignin with sugars, furans, and their derivatives as "impurities". Although several factors, including reactant structure, solvents, or the decreased ratio of catalyst to reactant, could be responsible for the jet fuel hydrocarbons yield loss, we found evidence that glucose, xylose, and 5-hydroxymethylfurfural dramatically decreased conversion yields...
July 2, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29966036/crystal-face-tailored-graphitic-carbon-nitride-films-for-high-performance-photoelectrochemical-cells
#20
Wei Xiong, Shunwei Chen, Miaoyan Huang, Zhenyu Wang, Zhouguang Lu, Ruiqin Zhang
Graphitic carbon nitride has been widely studied as a promising candidate for water splitting, owing to its metal-free nature, moderate band gap, and low cost. However, its photocurrent density is still very low for photoelectrochemical cell applications. In this work, a crystal face tailored graphitic carbon nitride photoelectrode has been fabricated by a facile thermal vapor deposition method. We use the melamine formaldehyde resin as a new precursor and have successfully fabricated graphitic carbon nitride films...
July 2, 2018: ChemSusChem
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