ChemSusChem

Cover image for Vol. 8 Issue 8

Editor-in-Chief: Guido Kemeling; Editorial Board Chairs: Matthias Beller, Gabriele Centi, Licheng Sun

Impact Factor: 7.117

ISI Journal Citation Reports © Ranking: 2013: 17/148 (Chemistry Multidisciplinary)

Online ISSN: 1864-564X

Associated Title(s): Angewandte Chemie International Edition, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemCatChem, ChemElectroChem, ChemPhysChem, Energy Technology

8_08/2015Cover Picture: Mechanism of Brønsted Acid-Catalyzed Glucose Dehydration (ChemSusChem 8/2015)

The Front Cover picture presents the DFT-based microkinetic model for the Brønsted acid-catalyzed conversion of glucose to 5-hydroxylmethyl furfural (HMF), levulinic acid, and formic acid. Isotopic tracing coupled with kinetic experiments provides a quantitative method to assess the mechanism and to propose unknown pathways among numerous ones that could be studied using first principles methods. We reveal that glucose dehydrates through a cyclic path, whereas the rate-limiting step is the first dehydration of protonated glucose and that the majority of glucose is consumed via the HMF intermediate. More details can be found in the Full Paper by Yang et al. on page 1334 (DOI: 10.1002/cssc.201403264).

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8_08i/2015Inside Cover: From Lignocellulosic Biomass to Lactic- and Glycolic-Acid Oligomers: A Gram-Scale Microwave-Assisted Protocol (ChemSusChem 8/2015)

The Inside Cover picture shows the complementary action of different microwave reactors in destroying the polymer chains of lignocellulosic biomass and rebuilding oligomers from the recovered building blocks. We designed a “microwave factory in the lab” for a flash catalytic conversion of biomass to selective platform chemicals—a sustainable protocol carried out in a microwave flow reactor. Lactic and glycolic acids were efficiently reacted to synthesize oligomers via a solvent- and catalyst-free microwave-assisted process under vacuum. Enabling technologies play a important role in biomass valorization, from agricultural wastes to value-added products in agreement with modern biorefinery. More details can be found in the Full Paper by Carnaroglio et al. on page 1342 (DOI: 10.1002/cssc.2014003183).

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8_08c/2015Inside Back Cover: Silver Phosphate/Graphitic Carbon Nitride as an Efficient Photocatalytic Tandem System for Oxygen Evolution (ChemSusChem 8/2015)

The Inside Back Cover image shows the photo-oxidation of water using silver phosphate/carbon nitride (Ag3PO4/g-C3N4). While tremendous efforts into the development photocatalytically active materials afforded highly efficient H2 evolution catalysts, the complementary, water oxidation reaction (mechanistically more demanding) remains the major obstacle for overall water splitting. The composite material is superior in both efficiency and stability compared to pristine Ag3PO4 and C3N4. A detailed analysis of the reactions mechanism strongly implies the in situ formation of an effective Z-scheme (mimicking photosynthesis in nature) through formation of Ag nanoparticles at the material interface under illumination, which is different to the conventional charge transport through the interface; this opens a method for the preparation of catalysts for full water splitting systems and other uphill energy conversion reactions. More details can be found in the Full Paper by Yang et al. on page 1350 (DOI: 10.1002/cssc.201403168).

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8_08b/2015Back Cover: Enhancing the Performance of a Robust Sol–Gel-Processed p-Type Delafossite CuFeO2 Photocathode for Solar Water Reduction (ChemSusChem 8/2015)

The Back Cover picture shows a solution-processed thin film of semi-conducting CuFeO2 held in front of the sun. An impressive performance is reported using this material as a photocathode for the reduction of water molecules to hydrogen (as depicted in the bottom right corner) under solar radiation. In addition to being fully solution processable, the copper-based delafossite (crystal structure is shown in the top right corner) is a class of material known for being stable in aqueous environments. Moreover, it is only composed of earth-abundant materials, as suggested by the delafossite ore shown in the bottom right corner. Overall, these properties make p-type CuFeO2 a very attractive material in the quest for inexpensive, sustainable, and stable direct solar water splitting for the generation of carbon-free hydrogen. More details can be found in the Full Paper by Prévot et al. on page 1359 (DOI: 10.1002/cssc.201403146).

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