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Zao Wang, Huitong Du, Zhiang Liu, Hui Wang, Abdullah M Asiri, Xuping Sun
It is of great importance to design and develop highly active electrocatalysts for the hydrogen evolution reaction (HER) under alkaline conditions. In this work, we report the development of a CeO2-Cu3P nanoarray supported on nickel foam (CeO2-Cu3P/NF) as an excellent HER catalyst with the demand of an overpotential of only 148 mV to deliver a geometrical catalytic current density of 20 mA cm-2 in 1.0 M KOH. Remarkably, this catalyst also shows strong long-term electrochemical durability for at least 100 h with nearly 100% Faradaic efficiency...
January 15, 2018: Nanoscale
Ahmed Naitabdi, François Rochet, Fabrice Bournel, Marco Bonato, Jean-Jacques Gallet, Federica Bondino, Elena Magnano
The patterning of silicon surfaces by organic molecules emerges as an original way to fabricate innovative nanoelectronic devices. In this regard, we have studied how a diamine, N,N,N',N'-tetramethylethylenediamine (TMEDA, (CH3)2N-[CH2]2-N(CH3)2), chelates the silicon dimers of the Si(001)-2 × 1 surface. Starting from very low coverage to surface saturation (at 300 K), we used real-time scanning tunneling microscopy (STM) in a scanning-while-dosing approach. The images show that the molecules can adopt two bonding configurations: the cross-trench (CT) configuration by bridging two adjacent dimer rows, and the end-bridge (EB) configuration by chelating two adjacent dimers in the same row...
January 15, 2018: Nanoscale
Maristella Alessio, Florian A Bischoff, Joachim Sauer
A hybrid QM:QM method that combines MP2 as high-level method on cluster models with density functional theory (PBE+D2) as low-level method on periodic models is applied to adsorption of methane and ethane on the MgO(001) surface for which reliable experimental desorption enthalpies are available. Two coverages are considered, monolayer (every second Mg2+ ion occupied) and one quarter coverage (one of eight Mg2+ ions occupied). Structure optimizations are performed at the hybrid MP2:(PBE+D2) level, with the MP2 energies and forces counterpoise corrected for basis set superposition error and extrapolated to the complete basis set limit...
January 15, 2018: Physical Chemistry Chemical Physics: PCCP
Shuangzhi Li, Lijun Liu, Qing Zhao, Chiyang He, Weikai Liu
Reducing Cr(vi) to Cr(iii) with formic acid is desirable for environmental protection, but the sluggish kinetics limits its practical application, which currently motivates the intensive study of efficient catalysts for this redox reaction. Here bimetallic PdCu nanoalloy (∼5 nm in size) supported by N-doped graphene was synthesized through a one-pot hydrothermal process. The catalytic activity of PdCu nanoalloy highly depends on the Pd/Cu atomic ratio and N-doped graphene support. The obtained Pd6Cu4/NG shows superior catalysis towards the Cr(vi) reduction by formic acid with a high kinetic constant (kn = 23...
January 15, 2018: Physical Chemistry Chemical Physics: PCCP
Yefei Li, Zhi-Pan Liu
Seeking for active MnOx material as artificial water splitting catalyst has been a long history since the discovery of PSII system in Nature. To date, the highest activity MnOx catalyst reported for oxygen evolution reaction (OER) is however not common MnO2 polymorphs (α-, β-, δ-MnO2), but nascent δ-MnO2 layer produced in situ from spinel under electrochemical conditions with unknown active site structure. Here with the stochastic surface walking (SSW) pathway sampling method, we for the first time resolve the atomic-level mechanism of spinel-to-layer Mn3O4 solid phase transition in aqueous electrolyte...
January 15, 2018: Journal of the American Chemical Society
Soojin Park, Sinho Choi, Dawei Su, Myoungsoo Shin, Guoxiu Wang
Porous materials have many structural advantages for energy storage and conversion devices such as rechargeable batteries, supercapacitors, and fuel cells. When applied as a host material in lithium-sulfur batteries, porous silica materials with a pomegranate-like architecture can not only act as a buffer matrix for accommodating a large volume change of sulfur, but also suppress the polysulfide shuttle effect. The porous silica/sulfur composite cathodes exhibit excellent electrochemical performances including a high specific capacity of 1450 mA h g-1, a reversible capacity of 82...
January 14, 2018: Chemistry, An Asian Journal
Zhenkun Lin, Yanfang Zhang, Yu Su, Jinxia Qi, Yinhang Jia, Changjiang Huang, Qiaoxiang Dong
One-monomer molecularly imprinted magnetic nanoparticles were prepared as adsorbents for selective extraction of bisphenol A from water in this study. A single bi-functional monomer was adopted for preparation of the molecularly imprinted polymer, avoiding the tedious trial-and-error optimizations as traditional strategy. Moreover, bisphenol F was used as the dummy template for bisphenol A to avoid the interference from residual template molecules. These nanoparticles not only showed large adsorption capacity and good selectivity to the bisphenol A, but also outstanding magnetic response performance...
January 15, 2018: Journal of Separation Science
Mingchuan Luo, Yingjun Sun, Xu Zhang, Yingnan Qin, Mingqiang Li, Yingjie Li, Chunji Li, Yong Yang, Lei Wang, Peng Gao, Gang Lu, Shaojun Guo
Selectively exposing active surfaces and judiciously tuning the near-surface composition of electrode materials represent two prominent means of promoting electrocatalytic performance. Here, a new class of Pt3 Fe zigzag-like nanowires (Pt-skin Pt3 Fe z-NWs) with stable high-index facets (HIFs) and nanosegregated Pt-skin structure is reported, which are capable of substantially boosting electrocatalysis in fuel cells. These unique structural features endow the Pt-skin Pt3 Fe z-NWs with a mass activity of 2.11 A mg-1 and a specifc activity of 4...
January 15, 2018: Advanced Materials
Ya-Qiong Su, Ivo A W Filot, Jin-Xun Liu, Emiel J M Hensen
Doping CeO2 with Pd atoms has been associated with catalytic CO oxidation, but current surface models do not allow CO adsorption. Here, we report a new structure of Pd-doped CeO2(111), in which Pd adopts a square planar configuration instead of the previously assumed octahedral configuration. Oxygen removal from this doped structure is favorable. The resulting defective Pd-doped CeO2 surface is active for CO oxidation and is also able to cleave the first C-H bond in methane. We show how the moderate CO adsorption energy and dynamic features of the Pd atom upon CO adsorption and CO oxidation contribute to a low-barrier catalytic cycle for CO oxidation...
January 5, 2018: ACS Catalysis
Jung Heon Lee, Gyu Sung Yi, Jin Woong Lee, Deug Joong Kim
Purpose: The physicochemical properties of a xenograft are very important because they strongly influence the bone regeneration capabilities of the graft material. Even though porcine xenografts have many advantages, only a few porcine xenografts are commercially available, and most of their physicochemical characteristics have yet to be reported. Thus, in this work we aimed to investigate the physicochemical characteristics of a porcine bone grafting material and compare them with those of 2 commercially available bovine xenografts to assess the potential of xenogenic porcine bone graft materials for dental applications...
December 2017: Journal of Periodontal & Implant Science
Na Guo, Kah Meng Yam, Xiaolu Wang, Chun Zhang
Recently, catalytic activity of atomically thin two dimensional (2d) materials has attracted great interests. In this paper, via first principles calculations, we show for the first time that N-doped 2d one-atom-thick ZnO nanosheets exhibit high catalytic activity towards CO oxidation. A pristine 2d ZnO nanosheet is chemically inert and as a result, CO and O2 molecules do not chemically bind on the nanosheet. Our calculations predict that the N doping activates the ZnO sheet, leading to strong CO and O2 adsorptions...
January 15, 2018: Nanotechnology
Ya-Ling Su, Shu-Hua Cheng
The toxicity of sulfa drugs has attracted great attention, and the reported electrochemical methods for sulfa drugs usually employ a high oxidation potential. In this work, a one-pot synthesized conducting polymer nanocomposite containing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 was cast on a screen-printed carbon electrode (SPCE), and the modified electrode showed superior electrochemical activity over a bare electrode for sulfamethazine (SMZ) determination. The SMZ detection was based on the electrochemical oxidation product, which showed an adsorptive property and exhibited a redox couple at 0...
April 1, 2018: Talanta
Jie Su, Xiwen He, Langxing Chen, Yukui Zhang
An efficient glycoproteins enrichment platform is one of vital preprocessing steps in biomarker research and in particular glycoproteomics. In this work, a well-defined boronic acid functionalized magnetic graphene oxide nanocomposite (Fe3O4-GO@PAAPBA) was synthesized for the selective enrichment of glycoproteins from complex biological samples via a novel strategy based on the "thiol-ene" click chemistry and surface initiated atom transfer radical polymerization (SI-ATRP). The initiator of ATRP was anchored to the surface of substrate through "thiol-ene" click reaction...
April 1, 2018: Talanta
Guihua Gao, Sijia Li, Shuo Li, Yudan Wang, Pan Zhao, Xiangyu Zhang, Xiaohong Hou
In this work, computational and experimental methods were used to study the adsorption of estrogens and glucocorticoids on metal-organic frameworks (MOFs). Computer-aided molecular simulation was applied to predict the adsorption of eight analytes on four MOFs (MIL-101(Cr), MIL-100(Fe), MIL-53(Al), and UiO-66(Zr)) by examining molecular interactions and calculating free binding energies. Subsequently, the four water-stable MOFs were synthesized and evaluated as adsorbents for the target hormones in aqueous solution...
April 1, 2018: Talanta
Tania Sierra, María Cristina González, Begoña Moreno, Agustin G Crevillen, Alberto Escarpa
Alpha-1-acid glycoprotein (AGP) or Orosomucoid is a serum glycoprotein which belongs to the group of acute phase proteins. It is a potential biomarker for inflammatory bowel diseases. In this sense, there is a need for developing fast and cheap analytical methods for diagnosis, prognosis and follow-up of these diseases. In this work, we propose a simple and cheap electrochemical method for total AGP determination using disposable carbon screen-printed electrodes (SPE) and using a selective acidic precipitation of the rest of proteins...
April 1, 2018: Talanta
Yi-Kun Li, Ting Yang, Ming-Li Chen, Jian-Hua Wang
Carbon dots were prepared via a one-pot hydrothermal route, and a new solid-phase extraction (SPE) adsorbent was developed by immobilizing the carbon dots on the microcarrier cytopore, shortly termed as C-dots@cytopore. The C-dots@cytopore composites were characterized by means of FT-IR, SEM, XPS and fluorescence spectrometry. The performance of the composites for the adsorption of heavy metals was thoroughly evaluated by using cadmium as a model. The binding of cadmium on C-dots@cytopore fits Langmuir adsorption, and the adsorption dynamic follows pseudo-second-order adsorption kinetics model...
April 1, 2018: Talanta
Hao Tian, Yan Jun Ma, Wan Yi Li, Jian Wen Wang
Triclosan (TCS), a widely used antimicrobial and preservative agent, is an emerging contaminant in aqueous and soil environment. Microbial degradation of TCS has not been reported frequently because of its inhibition of microbe growth. To explore the new microbial resources for TCS biodegradation, fungal endophytes were isolated and screened for the degradation potential. The endophytic strain B4 isolated from Artemisia annua L. showed higher degradation efficiency and was identified as Penicillium oxalicum based on its morphology and ITS sequences of ribosomal DNA...
January 13, 2018: Environmental Science and Pollution Research International
Songjian Zhao, Dongyao Chen, Haomiao Xu, Jian Mei, Zan Qu, Ping Liu, Yong Cui, Naiqiang Yan
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg0) in flue gas. Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg0 removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg0 adsorption capacity (3...
January 9, 2018: Chemosphere
Mohamed E M Ali, Azza M Abd El-Aty, Mohamed I Badawy, Rizka K Ali
Pharmaceutical compounds are considered emerging environmental pollutants that have a potential harmful impact on environment and human health. In this study, the biomass of alga (Scenedesmus obliquus) was modified using alkaline solution, and used for the biosorption of tramadol (TRAM) and other pharmaceuticals. The adsorption kinetics and isotherms were investigated. The obtained results reveal high adsorption capacity of tramadol over modified algal biomass (MAB) after 45min with removal percentage of 91%...
January 11, 2018: Ecotoxicology and Environmental Safety
Fan He, P M Biesheuvel, Martin Z Bazant, T Alan Hatton
Capacitive deionization (CDI) for water treatment, which relies on the capture of charged species to sustain the electrical double layers (EDLs) established within porous electrodes under an applied electrical potential, can be enhanced by the chemical attachment of fixed charged groups to the porous electrode electrodes (ECDI). It has recently been demonstrated that further improvements in capacity and energy storage can be gained by functionalization of the electrode surfaces with redox polymers in which the charge on the electrodes can be modulated through Faradaic reactions under different cell voltages in a capacitive process that can be called "Faradaic CDI" (FaCDI)...
January 3, 2018: Water Research
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