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ChemSusChem

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https://www.readbyqxmd.com/read/30421574/fe-n-codoped-graphdiyne-displaying-efficient-oxygen-reduction-reaction-activity
#1
Wenyan Si, Ze Yang, Xin Wang, Qing Lv, Fuhua Zhao, Xiaodong Li, Jianjiang He, Yunze Long, Juan Gao, Changshui Huang
On account of the high-cost of platinum, researchers are working to develop a new catalyst which is cheaper and has a catalytic effect that is equivalent to platinum. Herein, owing to the unique acetylenic bonds in the graphdiyne, the iron-nitrogen-doped graphdiyne (Fe-N-GDY) as a new promising nonprecious metal catalyst is developed with just a small amount of iron precursor to substitute for Pt-based catalysts. The as-synthesized Fe-N-GDY composited catalyst shows excellent catalytic performance with the onset potential of 0...
November 13, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30418691/cobalt-catalyzed-reductive-alkylation-of-amines-with-carboxylic-acids
#2
Balakumar Emayavaramban, Priyanka Chakraborty, Basker Sundararaju
We report a direct reductive alkylation of amines with carboxylic acid using inexpensive, air-stable cobalt/triphos catalytic system with molecular hydrogen. This efficient protocol proceed through reduction, condensation followed reduction of in-situ generated imine into amine via green catalytic process.
November 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30414247/synthesis-of-g-c3n4-nanosheets-using-highly-condensed-lamellar-crystalline-melamine-cyanuric-acid-supramolecular-complex-for-enhanced-solar-hydrogen-generation
#3
Trong-On Do
Highly condensed lamellar melamine-cyanuric acid supramolecular (MCS) complex was synthesized in autoclave at high pressure as a precursor for synthesizing g-C3N4 nanosheets. Due to the distinctive properties of the prepared MCS complex, the efficient g-C3N4 nanosheets photocatalyst can be obtained by heating treatment of this MCS complex under argon followed by calcination in air at 400 ºC. The resulting nanosheets with in-plan nanoholes showed an extremely high specific surface area (~270 m2 g-1) and significantly enhanced light absorption in the visible region...
November 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30412343/high-selectivity-towards-formate-production-by-electrochemical-reduction-of-carbon-dioxide-at-copper-bismuth-dendrites
#4
Zachary B Hoffman, Tristan S Gray, Yin Xu, Qiyuan Lin, T Brent Gunnoe, Giovanni Zangari
The electrochemical reduction of CO2 provides an alternative carbon-neutral path for renewable synthesis of fuels and value-added chemicals. This work demonstrates that dendritic, bimetallic Cu-Bi electrocatalysts with nanometer-sized grains are capable of formate generation with a high selectivity. Optimizing composition of electrocatalyst could achieve a faradic efficiency of 90 % at -0.8 to -0.9 VRHE , and a partial current of more than 2 mA cm-2 . The combination of Cu with Bi enables modulation of the adsorption strength of intermediates...
November 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30407741/catalytic-upgrading-of-biomass-derived-sugars-with-acidic-nanoporous-materials-structural-role-in-carbon-chain-length-variation
#5
Jian He, Hu Li, Saravanamurugan Shunmugavel, Song Yang
Shifting from petroleum-based resources to non-edible biomass for the production of valuable chemicals and fuels is one of significant aspects in sustainable chemistry for realizing the sustainable development of our society. Various renowned biobased platform molecules, such as 5-hydroxymethylfurfrual, furfural, levulinic acid and lactic acid, are successfully accessible from the transformation of bio-based sugars. To achieve the specific reaction routes, heterogeneous nanoporous acidic materials have been served as promising catalysts for bio-sugars conversion in the past decade years...
November 8, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30403439/alcohol-amination-catalyzed-by-copper-powder-as-a-self-supported-catalyst
#6
Yajuan Wu, Yongji Huang, Xingchao Dai, Feng Shi
Catalytic alcohol amination is a sustainable reaction for N-alkyl amine synthesis. In the past research, homogeneous and supported copper catalysts have been extensively studied and nice resutls were obtained. In this work, we'd like to show that copper powder can behave as an active catalyst for the alcohol amination, and its catalytic performance was better than the oxides supported nano-copper catalysts. Catalyst characterizations suggested that the copper powder can be considered as the self-supported nano-copper, i...
November 7, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30398304/tuning-confined-nanospace-for-preparation-of-n-doping-hollow-carbon-spheres-with-high-supercapacitor-performance
#7
Juan Du, Lei Liu, Yifeng Yu, Zepeng Hu, Beibei Liu, Yue Zhang, Aibing Chen
The structure parameters and surface functionality of hollow carbon spheres are critical for their electrochemical performance. Herein, we prepared N-doping hollow carbon spheres (N-HCS) with tunable structure parameters and surface properties based on confined pyrolysis strategy, in which polystyrene/polyaniline (PSPAN) was pyrolysized in a confined environment with different degree of openness. PSPAN functioned as the core, carbon and nitrogen source, and silica shell coating on PSPAN provided tunable confined nanospace...
November 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30395417/neutron-scattering-investigations-of-hydride-species-in-heterogeneous-catalysis
#8
Felipe Polo-Garzon, Si Luo, Yongqiang Cheng, Katharine L Page, Anibal J Ramirez-Cuesta, Phillip F Britt, Zili Wu
In heterogeneous catalysis, hydrides on the surface or in the bulk play a critical role as either active components or reaction intermediates in many hydrogen-involved reactions. Yet characterization of the nature and structure of these hydride species remains challenging. Neutron scattering, extremely sensitivity to light elements such as hydrogen, has shown great potential in meeting this challenge. In this review, we surveyed recent advances in neutron studies of hydride species mainly over two most typical classes of catalysts, metals and oxides...
November 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30394695/air-pollution-in-europe
#9
Gadi Rothenberg, Cedric Koolen
In this short critical perspective, we outline the serious problems caused by air pollution in Europe. Using two types of metrics, the level assessment and the trend assessment, we quantify the contribution of ammonia, NOx, SOx, non-methane VOCs, and particulate matter in terms of years of life lost per capita, and explain the connection between the various pollutants and their effects on human health and the environment. This is done based on data collected by individual European Union member states as well as by the EU as a whole...
November 5, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30387918/the-influence-of-some-surface-related-phenomena-on-mechanism-selectivity-and-conversion-of-tio2-induced-photocatalytic-reactions
#10
Francesco Parrino, Claudio De Pasquale, Leonardo Palmisano
Heterogeneous photocatalysis is the result of an inextricable connection of several factors differently contributing to the overall process. Photon absorption is the "sine qua non" condition for the reaction to occur. In fact, photons can be considered as immaterial reactants and all of the phenomena related to the interaction light-matter play a prominent role. However, other factors contribute in a concerted way to address the reaction, so that the relative contribution of each of them is often difficult to be evaluated...
November 2, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30383321/ultrahigh-catalytic-activity-of-l-proline-functionalized-rh-nanoparticles-for-methanolysis-of-ammonia-borane
#11
Yi Wang, Wenxiu Luo, Wei Cheng, Min Hu, Qi Wang, Xia Cheng, Yun Zhang, Daojiang Gao, Jian Bi, Guangyin Fan
The synthesis of ultrafine and well-distributed rhodium nanoparticles (NPs) with high efficiency toward methanolysis of ammonia borane (AB) is crucially important but challenging. Herein, we developed a facile approach for synthesizing ultrafine and uniform Rh NPs deposited on carbon by using the small soluble organic molecular (SOM) of L-proline as capping agent (Rh-PRO/C). It was discovered that L-proline enriching N, O-coordination sites for metal precursor was the key to synthesize such Rh-PRO/C material...
November 1, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30381905/c-h-bond-carboxylation-with-carbon-dioxide
#12
Junting Hong, Man Li, Jianning Zhang, Beiqi Sun, Fanyang Mo
Carbon dioxide (CO2) is a nontoxic, renewable and abundant one-carbon (C1) source, while C-H bond functionalization represents one of the most important approaches to the construction of carbon-carbon bonds and carbon-heteroatom bonds in an atom- and step-economical manner. Merging the chemical transformation of CO2 with C-H bond functionalization is of great importance in the synthesis of carboxylic acids and their derivatives. The contents of this review are organized according to the type of C-H bond involved in carboxylation...
October 31, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30381898/highly-active-bi-functional-electrocatalysts-for-oxygen-evolution-and-reduction-in-zn-air-batteries
#13
Ji-Hyun Jang, Sung-Wook Kim, Yoonkook Son, Keunsu Choi, Sun-I Kim, Yeonguk Son, Joohyuk Park, Jun Hee Lee
To realize the full performance of Zn-air batteries, the co-presence of a highly efficient oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER) in the system is critical. Although copper and nickel are known to be bi-functional catalysts for ORRs and OERs, sluggish reactions due to the exceptionally strong O=O bond on the metal surface make it difficult to achieve the high system efficiency. In this study, we fabricated a metal-carbide layer (CuCx and NiCx) on dendritic copper and nickel via a facile electrodeposition process to provide efficient catalytic active sites with moderate binding energy for easy electron transfer in both the OER and the ORR...
October 31, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30376219/molten-salt-assisted-synthesis-of-hierarchical-porous-mno-biocarbon-composites-as-promising-electrode-materials-for-supercapacitors-and-lithium-ion-batteries
#14
Hai Zhang, Ze Zhang, Jindi Luo, Xingtao Qi, Ji Yu, Jianxin Cai, Zhenyu Yang
Biomass-derived carbon composites have been used as promising electrode materials for energy storage devices due to their natural abundance and simple preparation process. However, low loading content/ inhomogeneous distribution of active substances and efficient cracking of biocarbon are the intractable obstacles to impede the efficient utilization of biomass. In this paper, the hierarchical porous MnO/Bio-carbon composites have been prepared by molten-salt-assisted strategy based on the superior salt-water absorption ability of agaric...
October 30, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30376216/applications-of-polyaniline-for-li-ion-batteries-li-sulfur-batteries-and-supercapacitors
#15
Yani Luo, Ruisong Guo, Tingting Li, Fuyun Li, Zhichao Liu, Mei Zheng, Baoyu Wang, Zhiwei Yang, Honglin Luo, Yizao Wan
Conducting polyaniline (PANI) exhibits momentous properties, such as high conductivity, reversible convertibility between redox states and advantageous structural feature and therefore receives ever-increasing attention for various applications. This paper extensively reviews recent studies on applications of polyaniline for Li-ion batteries (LIBs), Li-sulfur batteries (LSBs) and supercapacitors (SCPs). The flexible polyaniline is crucial for cyclability especially for buffering the volumetric changes of electrode materials, in addition to enhancing the electron/ions transport...
October 30, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30375739/development-of-betaine-based-sustainable-catalyst-for-green-conversion-of-carbohydrates-and-biomass-into-5-hydroxymethylfurfural
#16
Yunchao Feng, Mengzhu Li, Zhebang Gao, Xin Zhang, Xianhai Zeng, Yong Sun, Xing Tang, Tingzhou Lei, Lu Lin
This work develops renewable and sustainable betaine-based catalysts (BX), which are derived from betaine sugar industry or ChCl, for the production of 5-hydroxymethylfurfural (HMF) from various carbohydrates. In particular, in these BX-based medium, HMF yields reached up to 88%, 66%, 37% and 53%, when conversing fructose, glucose, cellulose and lignocellulosic biomass respectively. In addition, choline-O-sulfate (ChOS) was synthesized and demonstrated as an efficient catalyst for the conversion of fructose to HMF...
October 30, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30375174/homochiral-asymmetric-shaped-electron-transporting-materials-for-efficient-non-fullerene-perovskite-solar-cells
#17
Su-Kyo Jung, Jin Hyuck Heo, Dae Woon Lee, Seung-Heon Lee, Seung-Chul Lee, Woojin Yoon, Hoseop Yun, Dongwook Kim, Jong H Kim, Sang Hyuk Im, O-Pil Kwon
We propose a design strategy for electron transporting materials (ETMs) with homochiral asymmetric-shaped groups for highly efficient non-fullerene perovskite solar cells (PSCs). The electron transporting N,N'-Bis((R)-1-phenylethyl)naphthalene-1,4,5,8-tetracarboxylic diimide (NDI-PhE) consists of two asymmetric-shaped chiral (R)-1-phenylethyl (PhE) groups which act as solubilizing groups by reducing molecular symmetry and increasing free volume. NDI-PhE exhibits excellent film-forming ability with high solubility in various organic solvents (e...
October 29, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30371020/modes-of-fe-incorporation-in-co-fe-oxy-hydroxide-oxygen-evolution-electrocatalysts
#18
Ting Zhang, Michael Nellist, Lisa Enman, Junhui Xiang, Shannon Boettcher
Ni/Fe (oxy)hydroxide and Co/Fe (oxy)hydroxide are among the most-active oxygen evolution reaction (OER) catalysts in alkaline media. Fe is essential for the high activity, but the details of how Fe incorporates in the Ni/Co (oxy)hydroxide structure and affects catalysis remain incompletely understood. Here we report two different modes of Fe incorporation to form Co(Fe)OxHy that both yield increased OER activity, but result in Fe and Co species that differ in chemical reactivity and electrochemical response...
October 29, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30362260/across-the-board-antonio-facchetti
#19
Antonio Facchetti
In this series of articles, the board members of ChemSusChem discuss recent research articles that they consider of exceptional quality and importance for sustainability. This entry features Prof. Dr. Antonio Facchetti, who discusses the use of organic photovoltaic (OPV) devices as a source of renewable energy, and challenges that must be met for OPVs to serve as a viable fully sustainable technology for future energy production, taking into account the components used in such devices and their stability and durability...
October 26, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30362263/recent-advances-on-development-of-5-hydroxymethylfurfural-oxidation-with-base-non-precious-metal-containing-catalysts
#20
Saravanamurugan Shunmugavel, Priyanka Pal
5-Hydroxymethylfurfural (HMF) is one of the versatile platform molecules can be derived from biomass and a promising starting substrate for producing 2,5-diformylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA). DFF is a platform chemical having applications in pharmaceuticals, macrocyclic ligands and functional polymeric materials. Importantly, FDCA is being considered as a potential alternative to replace terephthalic acid for producing bioplastic PEF (polyethylene furanoate), instead of PET, by blending with ethylene glycol...
October 25, 2018: ChemSusChem
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