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Lingling Zhang, Danhua Ge, Genlong Qu, Junwei Zheng, Xueqin Cao, Hongwei Gu
Herein, we have developed a facile and effective approach for synthesizing a novel kind of porous nitrogen-doped carbon-coated MnO nanosphere. The porous Mn2O3 nanospheres are initially obtained by the calcination treatment of a coordination self-assembled aggregation precursor (referred to as Mn(OAc)2-C-8). Then, MnO@N-doped carbon composites (MnO@NCs) are obtained by the calcination of the Mn2O3 nanospheres coated with polydopamine (Mn2O3@PDA). The MnO@NCs are evaluated as an anode for lithium ion batteries (LIBs), which exhibit high specific capacity, stable cycling performance (1096...
April 12, 2017: Nanoscale
Matthew D Sampson, Jonathan D Emery, Michael J Pellin, Alex B F Martinson
Atomic layer deposition (ALD) of several metal oxides is selectivity inhibited on alkanethiol self-assembled monolayers (SAMs) on Au, and the eventual nucleation mechanism is investigated. The inhibition ability of the SAM is significantly improved by the in situ H2-plasma pretreatment of the Au substrate prior to the gas-phase deposition of a long-chain alkanethiol, 1-dodecanethiol (DDT). This more rigorous surface preparation inhibits even aggressive oxide ALD precursors, including trimethylaluminum and water, for at least 20 cycles...
April 5, 2017: ACS Applied Materials & Interfaces
Ting Wang, Hangang Li, Shaojun Shi, Ting Liu, Gang Yang, Yimin Chao, Fan Yin
MnO as anode materials has received particular interest owing to its high specific capacity, abundant resources, and low cost. However, serious problems related to the large volume change (>170%) during the lithiation/delithiation processes still results in poor rate capability and fast capacity decay. With homogenous crystals of MnO grown in the network of carbon nanofibers (CNF), binding effect of CNF can effectively weaken the volume change of MnO during cycles. In this work, a CNF/MnO flexible electrode for lithium-ion batteries is designed and synthesized...
April 3, 2017: Small
María C Nevárez-Martínez, Marek P Kobylański, Paweł Mazierski, Jolanta Wółkiewicz, Grzegorz Trykowski, Anna Malankowska, Magda Kozak, Patricio J Espinoza-Montero, Adriana Zaleska-Medynska
Vertically oriented, self-organized TiO₂-MnO₂ nanotube arrays were successfully obtained by one-step anodic oxidation of Ti-Mn alloys in an ethylene glycol-based electrolyte. The as-prepared samples were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV-Vis absorption, photoluminescence spectroscopy, X-ray diffraction (XRD), and micro-Raman spectroscopy. The effect of the applied potential (30-50 V), manganese content in the alloy (5-15 wt. %) and water content in the electrolyte (2-10 vol...
March 31, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Wei Zhang, Jiannian Li, Jie Zhang, Jinzhi Sheng, Ting He, Meiyue Tian, Yufeng Zhao, Changjun Xie, Liqiang Mai, Shichun Mu
To overcome inferior rate capability and cycle stability of MnO-based materials as a lithium-ion battery anode associated with the pulverization and gradual aggregation during the conversion process, we constructed robust mesoporous N-doped carbon (N-C) protected MnO nanoparticles on reduced graphene oxide (rGO) (MnO@N-C/rGO) by a simple top-down incorporation strategy. Such dual carbon protection endows MnO@N-C/rGO with excellent structural stability and enhanced charge transfer kinetics. At 100 mA g(-1), it exhibits superior rate capability as high as 864...
March 31, 2017: ACS Applied Materials & Interfaces
Sajad Yazdani, Raana Kashfi-Sadabad, Alessandro Palmieri, William E Mustain, Michael Thompson Pettes
MnO is an electrically insulating material which limits its usefulness in lithium ion batteries. We demonstrate that the electrochemical performance of MnO can be greatly improved by using oxygen-functional groups created on the outer walls of multiwalled carbon nanotubes (MWCNTs) as nucleation sites for metal oxide nanoparticles. Based on the mass of the active material used in the preparation of electrodes, the composite conversion-reaction anode material Mn1-x Co x O/MWCNT with x = 0.2 exhibited the highest reversible specific capacity, 790 and 553 mAhg(-1) at current densities of 40 and 1600 mAg(-1), respectively...
April 18, 2017: Nanotechnology
Tyler E Stevens, Charles J Pearce, Caleah N Whitten, Richard P Grant, Todd C Monson
Many challenges must be overcome in order to create reliable electrochemical energy storage devices with not only high energy but also high power densities. Gaps exist in both battery and supercapacitor technologies, with neither one satisfying the need for both large power and energy densities in a single device. To begin addressing these challenges (and others), we report a process to create a self-assembled array of electrochemically active nanoparticles bound directly to a current collector using extremely short (2 nm or less) conductive tethers...
March 13, 2017: Scientific Reports
Vladislav Borisov, Sergey Ostanin, Ingrid Mertig
Magnetoelectric coupling and spin polarization at the multiferroic PbTiO3/La2/3Sr1/3MnO3 (PTO/LSMO) interface is studied from first principles in view of the recent experimental observation of the tunneling magnetoresistance sign inversion in Co/PZT/LSMO tunnel junctions (Pantel et al 2012 Nat. Mater. 11 289). Our results confirm the stabilization of the locally antiferromagnetic order in the manganite when the PTO polarization points away from the LSMO side, which changes the interface magnetization by 6.3-6...
May 4, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
David McNulty, Hugh Geaney, Colm O'Dwyer
We present the formation of a carbon-coated honeycomb ternary Ni-Mn-Co-O inverse opal as a conversion mode anode material for Li-ion battery applications. In order to obtain high capacity via conversion mode reactions, a single phase crystalline honeycombed IO structure of Ni-Mn-Co-O material was first formed. This Ni-Mn-Co-O IO converts via reversible redox reactions and Li2O formation to a 3D structured matrix assembly of nanoparticles of three (MnO, CoO and NiO) oxides, that facilitates efficient reactions with Li...
February 10, 2017: Scientific Reports
Lianyi Shao, Qing Zhao, Jun Chen
MnOOH nanorods, which were prepared using a hydrothermal method, have been used for the first time as anode materials for sodium ion batteries. The as-prepared MnOOH nanorods with lengths of 1.2-3.7 μm and diameters of 60-90 nm delivered high performance of reversible electrochemical Na/Na(+) storage such as an initial discharge capacity of 485.5 mA h g(-1) at 80 mA g(-1), a high initial Coulombic efficiency of 86.7% and a low average potential polarization of 0.36 V. Instrumental analyses with ex situ XRD, TEM and XPS show that the sodium storage mechanism in MnOOH can be related to the reversible formation of MnO and NaOH...
February 9, 2017: Chemical Communications: Chem Comm
Florence T Ling, Jeffrey E Post, Peter J Heaney, James D Kubicki, Cara M Santelli
The characterization of birnessite structures is particularly challenging for poorly crystalline materials of biogenic origin, and a determination of the relative concentrations of triclinic and hexagonal birnessite in a mixed assemblage has typically required synchrotron-based spectroscopy and diffraction approaches. In this study, Fourier-transform infrared spectroscopy (FTIR) is demonstrated to be capable of differentiating synthetic triclinic Na-birnessite and synthetic hexagonal H-birnessite. Furthermore, IR spectral deconvolution of peaks resulting from MnO lattice vibrations between 400 and 750cm(-1) yield results comparable to those obtained by linear combination fitting of synchrotron X-ray absorption fine structure (EXAFS) data when applied to known mixtures of triclinic and hexagonal birnessites...
January 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Shailesh Kharkwal, Yi Chao Tan, Min Lu, How Yong Ng
A novel microbial fuel cell (MFC)-based biosensor was designed for continuous monitoring of biochemical oxygen demand (BOD) in real wastewater. To lower the material cost, manganese dioxide (MnO₂) was tested as an innovative cathode catalyst for oxygen reduction in a single chamber air-cathode MFC, and two different crystalline structures obtained during synthesis of MnO₂ (namely β- and γ-MnO₂) were compared. The BOD sensor was studied in a comprehensive way, using both sodium acetate solution and real domestic wastewater (DWW)...
January 28, 2017: International Journal of Molecular Sciences
Li Zhou, Yifan Huang, Weiwen Qiu, Zhanxiang Sun, Zhongqi Liu, Zhengguo Song
There is a continuing need to develop effective materials for the environmental remediation of copper-contaminated sites. Nano-MnO₂-biochar composites (NMBCs) were successfully synthesized through the reduction of potassium permanganate by ethanol in a biochar suspension. The physicochemical properties and morphology of NMBCs were examined, and the Cu(II) adsorption properties of this material were determined using various adsorption isotherms and kinetic models. The adsorption capacity of NMBCs for Cu(II), which was enhanced by increasing the pH from 3 to 6, was much larger than that of biochar or nano-MnO₂...
January 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Chenglong Yu, Feng Chen, Lifu Dong, Xiaoqing Liu, Bichun Huang, Xinnan Wang, Shengbang Zhong
Manganese-rich MnSAPO-34 molecular sieves were prepared by one-pot synthesis method for NO x abatement using the ammonia-selective catalytic reduction (NH3-SCR) technology and characterized using ICP, BET, XRD, FE-SEM, H2-TPR, NH3-TPD, XPS, and DR UV-Vis analyses. The experimental results indicate that the Mn content and chemical state, as well as the surface acidity, of the MnSAPO-34 molecular sieves significantly enhance their DeNO x efficiency at low temperatures (ca. 200-300 °C). The manganese-rich MnSAPO-34 was synthesized using a combination of triethylamine and diisopropylamine as the structural directing agents and high Mn loading (n(MnO)/n(P2O5) = 0...
January 23, 2017: Environmental Science and Pollution Research International
Dan Sun, Yougen Tang, Delai Ye, Jun Yan, Haoshen Zhou, Haiyan Wang
Morphology controllable fabrication of electrode materials is of great significance but is still a major challenge for constructing advanced Li ion batteries. Herein, we propose a novel space constraint assembly approach to tune the morphology of Mn(terephthalic acid) (PTA)-MOF, in which benzonic acid was employed as a modulator to adjust the available MOF assembly directions. As a result, Mn(PTA)-MOFs with microquadrangulars, microflakes, and spindle-like microrods morphologies have been achieved. MnO/C hybrids with preserved morphologies were further obtained by self-sacrificial and thermal transformation of Mn(PTA)-MOFs...
February 2, 2017: ACS Applied Materials & Interfaces
Kyoungsuk Jin, Hongmin Seo, Toru Hayashi, Mani Balamurugan, Donghyuk Jeong, Yoo Kyung Go, Jung Sug Hong, Kang Hee Cho, Hirotaka Kakizaki, Nadège Bonnet-Mercier, Min Gyu Kim, Sun Hee Kim, Ryuhei Nakamura, Ki Tae Nam
The development of active water oxidation catalysts is critical to achieve high efficiency in overall water splitting. Recently, sub-10 nm-sized monodispersed partially oxidized manganese oxide nanoparticles were shown to exhibit not only superior catalytic performance for oxygen evolution, but also unique electrokinetics, as compared to their bulk counterparts. In the present work, the water-oxidizing mechanism of partially oxidized MnO nanoparticles was investigated using integrated in situ spectroscopic and electrokinetic analyses...
February 1, 2017: Journal of the American Chemical Society
Kamal Azadkish, Mohammad T Jafari, Hassan S Ghaziaskar
Trace amounts of oxygen was determined using negative corona discharge as an ionization source for ion mobility spectrometry. A point-in-cylinder geometry with novel design was used to establish the corona discharge without interferences of negative ions such as NOX(-). The desirable background spectrum shows only electrons peak, providing the instrument capable of trace analysis of oxygen in gaseous samples. The limit of detection and linear dynamic range with high coefficient of determination (r(2) = 0...
February 8, 2017: Analytica Chimica Acta
Wenlong Cai, Gaoran Li, Kailong Zhang, Jianbin Zhou, Yitai Qian, Jin Du
A novel MnO/graphene composite, used as an anode for lithium ion intercalation, was prepared via an in situ surfactant-free facile method by taking advantage of the byproduct Mn ion in the conventional fabrication of graphene oxide. The as-fabricated lithium ion batteries exhibited a long-term stable reversible capacity (603 mA h g(-1) after 350 cycles at 1 A g(-1) based on the composite, hereinafter the same) and superior rate performance (400 mA h g(-1) at 3 A g(-1)).
December 6, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Haroldo T Hattori, Abdul Khaleque, Liming Liu, Michael R Greck
Manganese dioxide (MnO<sub>2</sub>) is an abundant material that is widely used in many devices, such as alkaline batteries. At infrared frequencies, MnO<sub>2</sub> is lossy and strongly absorbs light. These characteristics make MnO<sub>2</sub> a potential candidate as a low-cost saturable absorber in Q-switched lasers. In this paper, we examine the performance of MnO<sub>2</sub> as a saturable absorber in an ytterbium-doped Q-switched fiber laser: we show that it can produce pulses with durations ranging from 300 to 1800 ns...
November 10, 2016: Applied Optics
Mengting Liu, Wenhe Xie, Lili Gu, Tianfeng Qin, Xiaoyi Hou, Deyan He
A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability...
2016: Beilstein Journal of Nanotechnology
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