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https://www.readbyqxmd.com/read/30119007/facile-synthesis-of-znco-zifs-derived-zn-x-co-3-x-o-4-hollow-polyhedron-for-efficient-oxygen-evolution-reduction
#1
Lei Wang, Tianjiao Meng, Chunxia Chen, Yanwei Fan, Qianqian Zhang, Huan Wang, Yufan Zhang
The construction of highly active and stable non-noble metal electrocatalysts for oxygen evolution reaction (OER) is a crucial requirement for green energy utilization. Herein, we report a novel hybrid nanostructure of Zn/Co bimetallic oxide (Znx Co3-x O4 ) hollow polyhedron through a pyrolysis-oxidation strategy derived from bimetallic Zn, Co-zeolitic imidazolate frameworks (ZnCo-ZIFs) rhombic polyhedral. Benefiting from the synergistic effects between highly active metal oxide and the unique polyhedron structure, the Znx Co3-x O4 hollow polyhedron hybrid displayed outstanding electrocatalytic performances in alkaline media...
August 12, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30119005/two-dimensional-porous-co-ni-based-monometallic-hydroxides-and-bimetallic-layered-double-hydroxides-thin-sheets-with-honeycomb-like-nanostructure-as-positive-electrode-for-high-performance-hybrid-supercapacitors
#2
Biao Huang, Wensong Wang, Tao Pu, Jie Li, Jikui Zhu, Chenglan Zhao, Li Xie, Lingyun Chen
CoNi layered double hydroxides (LDH) and related monometallic hydroxides (Ni(OH)2 and Co(OH)2 ) were synthesized by a facile, simple and inexpensive method under mild condition (50 °C). The resulting products displayed a unique honeycomb-like nanoflakes array assembled two-dimensional (2D) thin sheets structure. Among them, CoNi-LDH thin sheets delivered higher specific capacity (394.5 C g-1 at 1 A g-1 ) with superior cyclic performance (92.3% capacity retention over 10,000 cycles) than Co/Ni monometallic hydroxides owing to the synergistic effect of cobalt and nickel...
August 9, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30118955/removal-of-tridecane-dicarboxylic-acid-in-water-by-nanoscale-fe-0-cu-0-bimetallic-composites
#3
Lishuo Chen, Rui Ni, Tengjie Yuan, Qinyan Yue, Baoyu Gao
In this study, nanoscale zerovalent Fe0 /Cu0 bimetallic composites were synthesized by liquid-phase reduction of Fe(II)/Cu(II) and applied for decomposition of tridecane dicarboxylic acid (DC13). The removal performance of Fe0 /Cu0 bimetallic composites for DC13 in terms of Fe/Cu ratios, addition amount, reaction time and initial pH were studied. The as-prepared nanoscale composites were characterized by a transmission electron micrographs (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), BET surface area, fourier transform infrared spectroscopy (FT-IR) and inductively coupled plasma-atomic emission spectrometry (ICP)...
August 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30118133/modular-bimetallic-complexes-with-a-sulfonamido-based-ligand
#4
Nathanael Lau, Yohei Sano, Joseph W Ziller, A S Borovik
A series of bimetallic complexes prepared with the ligands N,N,N',N'-tetramethylethane-1,2-diamine (TMEDA) and N,N',N''-[2,2',2''-nitrilotris(ethane-2,1-diyl)]tris(2,4,6-trimethylbenzenesulfonamido) ([MST]3-) is described. Four diiron compounds of the formulation (TMEDA)FeII(X)-(μ-OH)-FeIIIMST were prepared, in which the X- ligands are the anions OTf-, Br-, SCN-, or N3-. Additionally, two heterobimetallic compounds of the formulation (TMEDA)MII(OTf)-(μ-OH)-FeIIIMST (MII = CoII or NiII) were synthesized. All these compounds have similar spectroscopic and structural properties...
August 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30117656/cu-based-nanoparticles-as-emerging-environmental-catalysts
#5
REVIEW
Pangkita Deka, Biraj Jyoti Borah, Himadri Saikia, Pankaj Bharali
This account provides an overview of current research activities on nanoparticles containing the earth-abundant and inexpensive element copper (Cu) and Cu-based nanoparticles, especially in the field of environmental catalysis. The different synthetic strategies with possible modification of the chemical/ physical properties of these nanoparticles using such strategies and/or conditions to improve catalytic activity are presented. The design and development of support and/or bimetallic systems (e. g., alloys, intermetallic, etc...
August 17, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30113611/nanomaterial-based-electrochemical-sensors-for-the-safety-and-quality-control-of-food-and-beverages
#6
REVIEW
Venkatesh S Manikandan, BalRam Adhikari, Aicheng Chen
The issue of foodborne related illnesses due to additives and contaminants poses a significant challenge to food processing industries. The efficient, economical and rapid analysis of food additives and contaminants is therefore necessary in order to minimize the risk of public health issues. Electrochemistry offers facile and robust analytical methods, which are desirable for food safety and quality assessment over conventional analytical techniques. The development of a wide array of nanomaterials has paved the way for their applicability in the design of high-performance electrochemical sensing devices for medical diagnostics and environment and food safety...
August 16, 2018: Analyst
https://www.readbyqxmd.com/read/30110479/thickness-dependent-humidity-sensing-by-poly-vinyl-alcohol-stabilized-au-ag-and-ag-au-core-shell-bimetallic-nanomorph-resistors
#7
Parag Adhyapak, Rohini Aiyer, Sreekantha Reddy Dugasani, Hyeong-U Kim, Chung Kil Song, Ajayan Vinu, Venkatesan Renugopalakrishnan, Sung Ha Park, Taesung Kim, Haiwon Lee, Dinesh Amalnerkar
We herein report a simple chemical route to prepare Au-Ag and Ag-Au core-shell bimetallic nanostructures by reduction of two kinds of noble metal ions in the presence of a water-soluble polymer such as poly(vinyl alcohol) (PVA). PVA was intentionally chosen as it can play a dual role of a supporting matrix as well as stabilizer. The simultaneous reduction of metal ions leads to an alloy type of structure. Ag(c)-Au(s) core-shell structures display tendency to form prismatic nanostructures in conjunction with nanocubes while Au(c)-Ag(s) core-shell structures show formation of merely nanocubes...
June 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/30109776/folic-acid-derived-bimetal-doped-hollow-carbons-for-efficient-electrocatalytic-oxygen-evolution
#8
Junkuo Gao, Yuhang Wu, Mengting Lu, Yuwen Li, Panpan He, Sireesh Babu Maddine, Juming Yao
Hydrogen production is one of the most effective methods to combat the global energy crisis. However, improving the electrochemical performance of oxygen evolution catalysts is a significant challenge. In this paper, exceptionally active electrocatalysts for the oxygen evolution reactions (OERs) were successfully developed and characterized using SEM, TEM, XRD, XPS and BET measurements. The nitrogen doped hollow carbon encapsulated bi-metallic nanoparticles (NHCNPs) were prepared using folic acid coordination polymerization...
August 14, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/30109334/one-step-fabrication-of-bimetallic-ptni-mesoporous-nanospheres-as-an-efficient-catalyst-for-the-oxygen-reduction-reaction
#9
Hongjing Wang, Hongjie Yu, Shuli Yin, Yinghao Li, Hairong Xue, Xiaonian Li, You Xu, Liang Wang
The controlled synthesis of Pt-based bimetallic porous nanostructures is highly important for the design of electrocatalysts with high performance. Herein, we report a one-step method for the direct synthesis of well-dispersed bimetallic PtNi mesoporous nanospheres (PtNi MNs) at high yield. Benefitting from the synergistic effect of composition (bimetallic PtNi) and structure (mesoporous and highly open structure), the as-obtained PtNi MNs exhibit superior catalytic activity and stability for the oxygen reduction reaction...
August 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/30109043/bnpd-single-atom-catalysts-for-selective-hydrogenation-of-acetylene-to-ethylene-a-density-functional-theory-study
#10
Wanqi Gong, Lihua Kang
The mechanisms of selective hydrogenation of acetylene to ethylene on B11 N12 Pd single-atom catalyst were investigated through the density functional theory by using the 6-31++G** basis set. We studied the adsorption characteristics of H2 and C2 H2 , and simulated the reaction mechanism. We discovered that H2 underwent absolute dissociative chemisorption on single-atom Pd, forming the B11 N12 Pd(2H) dihydride complex, and then the hydrogenation reaction with C2 H2 proceeded. The hydrogenation reaction of acetylene on the B11 N12 Pd complex complies with the Horiuti-Polanyi mechanism, and the energy barrier was as low as 26...
July 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/30106082/low-valent-al-ii-al-ii-catalysts-as-highly-active-%C3%AE%C2%B5-caprolactone-polymerization-catalysts-indication-of-metal-cooperativity-through-dft-studies
#11
Olga V Kazarina, Christophe Gourlaouen, Lydia Karmazin, Alexander G Morozov, Igor L Fedushkin, Samuel Dagorne
The present study first describes the reactivity of low valent Al(ii) and Ga(ii) complexes of the type (dpp-bian)M-M(dpp-bian) (1, M = Al; 2, Ga; dpp-bian2- = 1,2-bis-(2,6-iPr2-C6H3)-acenaphthenequinonediamido) with cyclic esters/carbonates such as ε-caprolactone (CL) and trimethylene carbonate (TMC). CL and TMC both readily coordinate to the Al(ii) species 1 to form the corresponding bis-adducts (dpp-bian)Al(L)-(L)Al(dpp-bian) (3, L = CL; 4, L = TMC), which were structurally characterized confirming that the Al(ii)-Al(ii) dimetallic backbone retains its integrity in the presence of such cyclic polar substrates...
August 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30102004/sequential-transformation-of-zr-iv-mofs-into-heterobimetallic-mofs-bearing-magnetic-anisotropic-co-ii-centers
#12
Shuai Yuan, Jun-Sheng Qin, Jian Su, Bao Li, Jialuo Li, Wenmiao Chen, Hannah Drake, Peng Zhang, Daqiang Yuan, Jinglin Zuo, Hong-Cai Zhou
Heterometallic metal-organic frameworks (MOFs) allow the precise placement of various metals at atomic precision within a porous framework. This new level of control by MOFs promises fascinating advances in basic science and application. However, the rational design and synthesis of heterometallic MOFs remain a challenge due to the complexity of the heterometallic systems. Herein, we show that bimetallic MOFs with MX2(INA)4 moieties (INA = isonicotinate; M = Co2+ or Fe2+; X = OH-, Cl-, Br-, I-, NCS-, or NCSe-) can be generated by the sequential modification of a Zr-based MOF...
August 13, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30101581/engineering-of-hollow-pdpt-nanocrystals-via-reduction-kinetic-control-for-their-superior-electrocatalytic-performances
#13
Caihong Fang, Jun Zhao, Ruibin Jiang, Jing Wang, Guili Zhao, Baoyou Geng
Synthesis of hollow metal nanocrystals is greatly attractive for their high active surface areas, which gives rise to excellent catalytic activity. Taking PdPt alloy nanostructure as an example, we designed a synthetic tactic for the preparation of hollow metal nanostructures by delicate control over the difference in the reduction kinetic of metal precursors. At a high reduction rate difference, the Pd layer forms from the H2 PdCl4 and subsequently is etched, leading to the formation of a hollow space. A solid PdPt structure is achieved when reduction rate of Pd and Pt precursor is comparable...
August 13, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30096234/continuous-flow-production-of-succinic-anhydrides-via-catalytic-%C3%AE-lactone-carbonylation-by-co-co-4%C3%A2-cr-mil-101
#14
Hoyoung D Park, Mircea Dinca, Yuriy Roman-Leshkov
Industrial synthesis of succinic acid relies on hydrocarbon oxidation or biomass fermentation routes that suffer from energy-costly separation processes. Here we demonstrate an alternate route to succinic anhydrides via β-lactone carbonylation by heterogeneous bimetallic ion-pair catalysis in Co(CO)4 - -incorporated Cr-MIL-101 (Co(CO)4⊂Cr-MIL-101, Cr-MIL-101 = Cr3 O(BDC)3 F, H2 BDC = 1,4-benzenedicarboxylic acid). Postsynthetically introduced Co(CO)4 - facilitates CO insertion to β-lactone substrates activated by the Lewis acidic Cr(III) centers of the metal-organic framework (MOF), leading to catalytic carbonylation with activity and selectivity profiles that compare favorably to those reported for homogeneous ion-pair catalysts...
August 10, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30095414/stimulation-of-secondary-metabolites-by-copper-and-gold-nanoparticles-in-submerge-adventitious-root-cultures-of-stevia-rebaudiana-bert
#15
Bushra Ghazal, Sumaia Saif, Kashif Farid, Adnan Khan, Sapna Rehman, Ahmad Reshma, Hina Fazal, Mohammad Ali, Ashfaq Ahmad, Latifur Rahman, Nisar Ahmad
Nanotechnology is one of the advance technologies that almost found implications in every field of science. The importance is due to the unique properties of nanoparticles. In this study, bimetallic alloys of copper (Cu) and gold (Au) were tested in submerge root cultures of Stevia rebaudiana for production of biomass and secondary metabolites. A known amount of inoculum roots were submerged in liquid Murashige and Skoog medium containing combination of naphthalene acetic acid (NAA; 0.5 mg l-1 ) and different ratios of nanoparticles (NPs)...
August 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/30090301/high-performance-layer-by-layer-pt-3-ni-pt-skin-modified-pd-c-for-the-oxygen-reduction-reaction
#16
Jing-Fang Huang, Po-Kai Tseng
Bimetallic Pt-Ni with Pt on the outermost layer and an innermost layer enriched in Ni, referred to as Pt3 Ni(Pt-skin), is a promising configuration of an electrocatalyst for the oxygen reduction reaction (ORR) in fuel cells. We prepare a core (Pd)/shell (Pt3 Ni(Pt-skin)) catalyst (Pt3 Ni(Pt-skin)/Pd/C) from Zn underpotential deposition (UPD) on a Ni UPD modified Pd/C catalyst, facilitating Pt atomic layer-by-layer growth on the Ni surface through the galvanic replacement process. Pt3 Ni(Pt-skin)/Pd/C shows the best ORR performance, with a Pt specific activity of 16...
July 28, 2018: Chemical Science
https://www.readbyqxmd.com/read/30089361/formation-cum-intercalation-of-ni-and-its-alloy-nanoparticles-within-mesoporous-silica-for-robust-catalytic-reactions
#17
Bowen Li, Hua Chun Zeng
Intercalation of silica supported nickel nanoparticles within mesoporous silica has been achieved through chemical reduction of nickel silicate with mesoporous silica (mSiO2) coated on inner and outer surfaces. Formation of nickel nanoparticles was controlled at nickel silicate-silica interface and well confined by mSiO2 coating. Doping of other transition metals has been accomplished at the stage of nickel silicate formation, because of similarity in critical stability constants of respective metal salts. Doped nickel silicates were able to produce nickel based bimetallic and trimetallic alloy nanoparticles within the final dual shell configuration...
August 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30088850/mechanistic-investigation-into-dna-modification-by-a-ruii-rhiii-bimetallic-complex
#18
José Á Rodríguez-Corrales, Jing Wang, Brenda S J Winkel, Karen J Brewer
Despite significant progress in the treatment of cancer, there remains an urgent need for more effective therapies that also have less impact on patient wellbeing. Photodynamic therapy employs targeted light activation of a photosensitizer in selected tissues, thereby reducing off-target toxicity. Our group previously reported a RuII,RhIII bimetallic architecture that displays multifunctional covalent photomodification of DNA in the therapeutic window through an oxygen-independent manner, features essential for treating deep and hypoxic tumors...
August 8, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/30087976/bimetallic-pd-pt-alloy-nanocluster-arrays-on-graphene-rh-111-formation-stability-and-dynamics
#19
Fabian Düll, Udo Bauer, Florian Späth, Philipp Bachmann, Johann Steinhauer, Hans-Peter Steinrück, Christian Papp
Alloy catalysts have, in many cases, superior properties compared to their single metal counterparts. To gain deeper insights, we used graphene-supported bimetallic nanocluster arrays as a model system. We investigated the site occupation and the dynamic behavior of the metal distribution during adsorption and thermal treatment of CO layers on PdPt alloy nanocluster arrays supported on the graphene/Rh(111) Moiré. We find that the adsorption of CO combined with heating to 550 K leads to a rearrangement of the surface atoms, resulting in all the edge sites of the nanoclusters being occupied by Pd atoms...
August 8, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30087278/in-situ-conversion-of-zno-ni%C3%A2-znc-0-7-cnt-composite-from-nizn-bimetallic-mof-precursor-with-enhanced-electromagnetic-property
#20
Lina Huang, Shaolong Huang, Ziyu Yang, Ailun Zhao, Chengxiang Liu, Jianguo Lu, Shuangchen Ruan, Yu-Jia Zeng
ZnO/Ni₃ZnC0.7 /x% CNT (x = 0, 2, 5, 10) urchin-like structures have been synthesized using a facile method based on metal-organic frameworks (MOFs) and applied as the electromagnetic absorber. The results of the experiments demonstrate that the content of multi-wall carbon nanotubes (MWCNT) has a great influence on the absorbing performance of the hybrid material. Conduction loss, interfacial polarization and ferromagnetic resonance all contribute to the electromagnetic absorption. The urchin-like ZnO/Ni₃ZnC0...
August 7, 2018: Nanomaterials
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