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ChemSusChem

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https://www.readbyqxmd.com/read/29345435/n-modified-nio-surface-for-superior-alkaline-hydrogen-evolution
#1
Le Zhang, Peng Fei Liu, Yu Hang Li, Meng Yang Zu, Xu Li, Zheng Jiang, Yun Wang, Huijun Zhao, Huagui Yang
Boosting the sluggish kinetics of hydrogen evolution reaction in alkaline environments is the key for large application of water-alkali and chlor-alkali electrolysis. Herein, for the first time, we use nitrogen atoms to precisely modulate electrochemical active sites on the surface of nickel oxide with low coordinated oxygen atoms, to achieve enhanced kinetics of alkaline hydrogen evolution. Theoretical and experimental results demonstrate that the surface charge redistribution after modulation simultaneously facilitates the initial water dissociation step, as well as the subsequent recombination of Had from low coordinated oxygen sites and desorption of OH-ad from nickel sites, thus accelerating the overall hydrogen evolution process...
January 18, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29345423/deep-eutectic-solvent-aqueous-solutions-as-efficient-media-for-the-solubilization-of-hardwood-xylans
#2
Eduarda S Morais, Patrícia V Mendonça, Jorge F J Coelho, Mara G Freire, Carmen S R Freire, João A P Coutinho, Armando J D Silvestre
This work contributes to the development of integrated lignocellulosic-based biorefineries by the pioneering exploitation of hardwood xylans by solubilization and extraction in deep eutectic solvents (DES). DES formed by choline chloride and urea or acetic acid were initially evaluated as solvents for commercial xylan as a model compound. The effects of temperature, molar ratio, and concentration of the DES aqueous solutions were evaluated and optimized by using a response surface methodology. The results obtained demonstrated the potential of these solvents, with 328...
January 18, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29336527/sustainable-synthesis-of-oxalic-and-succinic-acid-via-aerobic-oxidation-of-c6-polyols-by-using-m-cnt-ncnt-m-fe-v-based-catalysts-in-mild-conditions
#3
Angela Dibenedetto, Maria Ventura, David Williamson, Francesco Lobefaro, Matthew D Jones, Davide Mattia, Francesco Nocito, Michele Aresta
Sustainable chemical industry encompasses the shift from fossil carbon to renewable carbon. The synthesis of chemicals from non-edible biomass (cellulosic or oily) represents one of the key steps for "greening" the chemical industry. In this paper we report the aerobic oxidation-cleavage of C6 polyols (5-HMF, glucose, fructose, sucrose) in water to oxalic acid-OA (and succinic acid-SA) under mild conditions using M@CNT/NCNT (M=Fe, V; CNT=carbon nanotubes; NCNT= N-doped CNT), which, under suitable conditions, are recoverable and reusable without any loss of efficiency...
January 16, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29334177/polypropylene-nonwoven-fabric-poly-ionic-liquid-s-for-switchable-oil-water-separation-dye-absorption-and-antibacterial-applications
#4
Yongyuan Ren, Jiangna Guo, Dan Xu, Jing Qin, Qian Lu, Feng Yan
Pollutants in wastewater include oils, dyes, and bacteria, making wastewater cleanup difficult. Here, we propose the preparation of multifunctional wastewater treatment media, poly(ionic liquid) grafted polypropylene (PP) nonwoven fabrics (PP@PIL), prepared via a simple and scalable surface grafting process. The fabricated PP@PIL fabrics exhibited superior switchable oil/water separation (η > 99%) and dye absorption performance (q = 410 mg/g), as well as high antibacterial properties. The oil/water separation could be easily switched via anion-exchanging of PIL segments...
January 15, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29329485/photo-initiated-reduction-of-co2-by-h2-on-silica-surface
#5
Chao Liu, Justin M Notestein, Eric Weitz, Kimberly A Gray
The reduction of CO2 is a promising route to produce valuable chemicals or fuels and create C-neutral resource cycles. Many different approaches to CO2 reduction have been investigated, but the ability of vacuum UV (VUV) irradiation to cleave C-O bonds has remained largely unexplored for use in processes that convert CO2 into useful products. Compared with other photo-driven CO2 conversion processes, here we demonstrate that VUV-initiated CO2 reduction can achieve much greater conversion under common photochemical reaction conditions when H2 and non-reducible oxides are present...
January 12, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29327513/methanol-water-aqueous-phase-reforming-by-the-assistant-of-dehydrogenases-at-near-room-temperature
#6
Yangbin Shen, Yulu Zhan, Shuping Li, Fandi Ning, Ying Du, Yunjie Huang, Ting He, Xiaochun Zhou
As an excellent hydrogen storage medium, methanol has many advantages, such as high hydrogen content (12.6 wt%), low-cost and availability from biomass or photocatalysis. However, conventional methanol-water reforming usually proceeds at high temperature. In this research, we successfully designed a new effective strategy to generate hydrogen from methanol at near-room temperature. The strategy involves two main procedures, which are CH3OH→HCOOH→H2 and NADH→HCOOH→H2. The first procedure (CH3OH→HCOOH→H2) is performed by alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH) and the Ir-catalyst...
January 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29323463/ultrathin-bismuth-nanosheets-as-highly-efficient-electrocatalyst-for-co2-reduction
#7
Panpan Su, Wenbin Xu, Yanling Qiu, Taotao Zhang, Xianfeng Li, Huamin Zhang
Electrochemical reducing CO2 to value-added products is an important and challenging reaction for sustainable energy study. In this study, bismuth nanosheets with thickness of ~10 nm were successfully prepared via electrochemical reduction of Bi3+. Ultrathin Bi nanosheets with numerous low-coordination sites can efficiently reduce CO2 to formate in aqueous solution. During the potential range of - 0.9 V to - 1.2 V vs RHE, the faradaic efficiency of formate is over 90%, which is one of the best reported Bi catalysts...
January 11, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29319239/cellular-structure-fabricated-on-ni-wire-by-a-simple-and-cost-effective-direct-flame-approach-and-its-application-in-fiber-shaped-supercapacitors
#8
Zhihong Wang, Fenhui Cao, Kongfa Chen, Yingming Yan, Yifu Chen, Yaohui Zhang, Xingbao Zhu, Bo Wei, Yueping Xiong, Zhe Lv
Cellular metals with the large surface-to-volume ratios and excellent electrical conductivity are widely applicable and have thus been studied extensively. It is highly desirable to develop a facile and cost-effective process for fabrication of porous metallic structures, more so for micron/nano pores. Herein, we propose a novel direct-flame strategy for in-situ fabrication of micron cellular architecture on Ni metal precursor. The flame provides required heat, but also serves as a fuel reformer providing a gas mixture of H2, CO and O2 for redox treatment of Ni metals...
January 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29319232/methylation-of-polyols-with-trimethylphosphate-in-the-presence-of-a-lewis-or-br%C3%A3-nsted-acid-catalyst
#9
Marie-Christine Duclos, Aurélien Herbinski, Anne-Sophie Mora, Estelle Métay, Marc Lemaire
The alkylation of alcohols and polyols has been investigated with alkylphosphates in the presence of a Lewis or Brønsted acid catalyst. The permethylation of polyols was developed under solvent-free conditions at 100 °C with either iron triflate or Aquivion PW98, affording the isolated products in yields between 52 and 95 %. The methodology was also adjusted to carry out peralkylation with longer alkyl chains.
January 10, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316346/across-the-board-xinchen-wang
#10
Xinchen Wang
In this series of articles, the board members of ChemSusChem discuss recent research that they consider of exceptional quality and importance for sustainability. In this entry, Prof. Xinchen Wang discusses the investigations of a printable Z-scheme system for photocatalytic water splitting by the pioneer, Prof. Kazunari Domen, who has been constantly contributing to this field for about 40 years. The recent achievement of an overall water splitting system has exceeded the solar-to-hydrogen energy efficiency of 1% by integrating efficient hydrogen and oxygen evolution photocatalysts with charge-transport channel...
January 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316272/oxygen-reduction-reaction-for-generating-h2o2-via-piezo-catalytic-process-over-biocl
#11
Wenzhong Wang, Dengkui Shao, Ling Zhang, Songmei Sun
Oxygen reduction reaction (ORR) for generating H2O2 via green pathways have gained much attention in recent years. Herein, we introduce a piezo-catalytic approach to obtain H2O2 over BiOCl via ORR pathway. The piezoelectric response of BiOCl was directly characterized by piezoresponse force microscope (PFM). The BiOCl exhibits efficient catalytic performance for generating H2O2 (28 µmol/h ) only from O2 and H2O, which is above the average level of H2O2 produced by solar-to-chemical process. A piezo-catalytic mechanism was proposed: with ultrasonic waves, an alternating electric field will be generated over BiOCl, which can drive charge carriers (electrons) to interact with O2 and H2O, then to form H2O2...
January 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316263/pt-islands-on-3d-nut-like-ptag-nanocrystals-for-efficient-formic-acid-oxidation-electrocatalysis
#12
Hui Xu, Pingping Song, Bo Yan, Jin Wang, Caiqin Wang, Yukihide Shiraishi, Ping Yang, Yukou Du
Precise control of the structure offers a great opportunity to efficiently tune the catalytic performances of nanomaterials, enabling them enhancement in both activity and durability. We herein achieve a new class of Pt islands on 3D nut-like PtAg nanocrystals by exploiting the lower electronegativity of Ag and in conjunction with the galvanic replacement of catalytically active Pt to Ag tops. Those nanostructures with Pt nanoparticles coated, exposed facet, active surface composition enhance formic acid oxidation electrocatalysis with the optimized PtAg1 nuts achieved a factor of 4...
January 9, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316333/hybrid-organic-inorganic-anatase-as-a-bifunctional-catalyst-for-enhanced-production-of-hmf-from-glucose-in-water
#13
Carlos A S Lanziano, Silvia F Moya, Dean H Barrett, Reginaldo Guirardello, Felipe de Souto da Silva, Roberto Rinaldi, Cristiane Barbieri Rodella
Herein, we report a synthetic route for the preparation of hybrid-organic-inorganic anatase (hybrid-TiO2) via a facile hydrothermal synthesis method employing citric acid. The synthetic approach results in a high surface area nanocrystalline anatase polymorph of TiO2. The uncalcined hybrid-TiO2 is directly studied here as the catalyst for the conversion of glucose into HMF. In the presence of the hybrid-TiO2, HMF yields up to 45% at glucose conversions up to 75% were achieved in water at 130 oC in a monophasic batch reactor...
January 8, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316318/a-perspective-review-on-the-materials-and-mechanisms-of-photo-assisted-chemical-reactions-under-light-and-dark-can-it-be-called-as-day-night-photocatalysis
#14
Sakar Mohan, Nguyen Chinh-Chien, Vu Manh-Hiep, Trong-On Do
The photo-assisted catalytic reaction, conventionally known as photocatalysis, is blooming into the field of energy and environmental applications. It is widely known that the discovery of TiO2-assited photochemical reactions has led to achieve several unique applications such as degradation of pollutants in water and air, hydrogen production through water splitting, fuel conversion, cancer treatment, anti-bacterial activity, self-cleaning glasses and concrete, etc. These multifaceted applications of this phenomenon can be enriched and expanded further if this process is equipped with more tools and functions...
January 8, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316342/towards-sustainable-production-of-formic-acid-from-biomass-for-getting-hydrogen-and-fuels
#15
Dmitri Bulushev, Julian R H Ross
Formic acid is a widely used commodity chemical. It can be used as a safe, easily handled and transported source of hydrogen or CO for different reactions including those producing fuels. The review includes historical aspects of formic acid production. It shortly analyzes the production based on traditional sources such as CO, methanol and methane. However, the main emphasis is done to the sustainable production of formic acid from biomass and biomass-derived products via hydrolysis, wet and catalytic oxidation processes...
January 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316323/fabrication-of-cu2o-based-materials-for-lithium-ion-batteries
#16
Huan Pang, Qin Yuan Li, Li Zhang, Huai Guo Xue
The improvement of the performance of advanced batteries has played a key role in the energy research community since its inception. Therefore, it is necessary to explore excellent materials for applications in advanced batteries. Among the variety of materials applied in batteries, cuprous oxide and its composites stand out because of their specific characteristics (polymorphic forms, controllable structure, high cycling capacity, etc.). Thus, cuprous oxide and its composites will be fully introduced in this review for their applications in advanced batteries...
January 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29316308/bifunctional-pyridinium-based-ionic-liquid-immobilized-in2-dpa-3-1-10-phen-2-efficacy-of-supported-ionic-liquid-phase-metal-organic-framework-catalyst-for-co2-fixation-reactions
#17
Robin Babu, Jintu Francis Kurisingal, Jong-San Chang, Dae-Won Park
A pyridinium-based ionic liquid-decorated 1D MOF (IL-[In2(dpa)3(1,10-phen)2]) was developed as a bifunctional heterogeneous catalyst system for CO2-oxirane coupling reactions. An aqueous-microwave route was employed as competent with the hydrothermal pathway for the synthesis of [In2(dpa)3(1,10-phen)2] MOF, and the IL-[In2(dpa)3(1,10-phen)2] catalyst was synthesized using the covalent post functionalization method. Due to the synergetic effect of dual functional sites, including Lewis acid sites (coordinatively unsaturated indium sites) and I- ion in IL functional sites, IL-[In2(dpa)3(1,10-phen)2] displayed high catalytic activity for CO2-epoxide cycloaddition reactions under mild and solvent free conditions...
January 6, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29314643/mos2-moox-nanostructure-decorated-activated-carbon-cloth-for-enhanced-supercapacitor-performances
#18
Fitri Nur Indah Sari, Jyh-Ming Ting
MoS2/MoOx nanostructures have been grown on activated carbon cloth through a facile one-step microwaved-assisted hydrothermal. The growth of MoS2/MoOx on activated carbon cloth create a unique structure that favors ions intercalation. The conductive activated carbon cloth, MoO3-x, and monoclinic MoO2 provide fast electron transport while the MoS2 nanosheets/MoO3-x nanoparticles nanostructure improves the capacitance. As a result, MoS2/MoOx nanostructure decorated activated carbon cloth shows high specific capacitance of 230 F g-1 at a scan rate of 5 mV s-1 with low contact resistance ~1...
January 4, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29292866/a-co2p-wc-nano-heterojunction-covered-by-n-doped-carbon-as-high-efficient-electrocatalyst-for-hydrogen-evolution-reaction
#19
Yang-Guang Li, Ya Gao, Zhong-Ling Lang, Fei-Yang Yu, Hua-Qiao Tan, Gang Yan, Yong-Hui Wang, Yuan-Yuan Ma
Hydrogen evolution reaction (HER), which produces clean hydrogen through the electrochemical process, screams for more non-precious-metal electrocatalysts to lower the consumption of energy. Herein, we report a new Co2P/WC nano-heterojunction that consists of cobalt phosphide and tungsten carbide composite phases coated by few-layer N-doped graphitic carbon shells (abbr. Co2P/WC@NC). The composite was prepared by one-step annealing of the polyoxometalate Na9(NH4)5[{(B-α-PW9O34)Co3(OH) (H2O)2(Ale)}2Co]·35H2O (Co7P6W18) and dicyandiamide (DCA)...
January 2, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29292853/an-efficient-metal-free-catalyst-for-oxidative-dehydrogenation-reaction-activated-carbon-decorated-with-few-layer-graphene
#20
Yajie Zhang, Jiangyong Diao, Junfeng Rong, Jiayun Zhang, Jingxin Xie, Fei Huang, Zhimin Jia, Hongyang Liu, Dangsheng Su
Activated carbon (AC) has been widely used in catalysis field because of its low-cost, scalable production, high specific surface area and abundant exposed edge. Due to the amorphous structure, traditional AC is unstable in presence of O2 at high temperature, which hinders the application of AC catalysts in oxidative dehydrogenation (ODH) of alkanes. In this work, partially graphitic AC decorated with few-layer graphene is facilely fabricated by the simple high-temperature calcination. The graphitic transformation significantly enhances the anti-oxidation property, long-term stability of AC during the ODH reaction, and especially increases the graphitic edge areas where the active ketonic carbonyl groups are selectively formed in the ODH reactions...
January 2, 2018: ChemSusChem
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