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G Radhika, R Subadevi, K Krishnaveni, Wei-Ren Liu, M Sivakumar
Lithium-Sulfur (Li-S) batteries have been achieved great attention in recent years owing to its high theoretical capacity (1675 mAh/g) and energy density (2600 Wh/kg). PEG embedded MnO2/Sulfur composite was prepared via solid state reaction method. The composite was characterized by Transmission electron microscopy, scanning electron microscopy and X-ray diffractometer. MnO2 effectively suppress the diffusion of polysulfides and add a mechanical strength to the electrode. PEG binds the MnO2 and S, resulting in the minimization of active material loss and improves the electrochemical performance in lithium sulfur batteries...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Yu-Cheng Liu, Nae-Lih Wu, Wei-Ren Liu
Li-rich layered cathode materials, Li1.2Ni0.4-xAlxMn0.6O2.2-y Cly (0 ≤ x ≤ 0.03 and 0 ≤ y ≤ 0.03), were successfully synthesized through coprecipitation, and the effects of Al3+-Cl- co-substitution on their surface morphology, crystal structure, surface chemistry, and electrochemical performance were characterized through XRD, SEM, XPS, TEM, and electrochemical and charge-discharge cycling. Doping the cathodes with Al3+ and Cl- ions enhanced electrochemical performance at room temperature and at a high working temperature of 55 °C...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Gesche M Huebner, Ian Hamilton, Zaid Chalabi, David Shipworth, Tadj Oreszczyn
OBJECTIVES: We examine if temperatures in winter in English homes meet the recommendation of being at least 18°C at all times. We analyse how many days meet this criterion and calculate the hours per day and night being at/above 18°C. These metrics are compared between households with occupants aged above 64 years or having a long-term disability (LTD) and those younger and without disability. DESIGN: Cross-sectional, observational. SETTING: England...
May 14, 2018: BMJ Open
J Krishna Murthy, P S Anil Kumar
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
May 15, 2018: Scientific Reports
Jia-Jia Xu, Xiao-Ling Zhu, Qian-Qian Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Ying-Hong Zhu, Zheng-Quan Ji, Ren-Cun Jin
The long-term impacts of MnO2 on performance, sludge characteristics and microbial community of biogranule-based anaerobic ammonium oxidation (anammox) process were evaluated in an up-flow anaerobic sludge blanket reactor. It was found that the total nitrogen removal efficiency of reactor was fluctuated between 90%-93% at 1-200mgL-1 MnO2 . Notably, the specific anammox activity was increased to maximum value of 657.3±10.6mgTNg-1 VSSd-1 at 50mgL-1 MnO2 and then slightly decreased, but still higher than that achieved at 0-15mgL-1 MnO2 , which had similar variation trends to the content of heme c and extracellular polymeric substances in anammox granules...
August 15, 2018: Science of the Total Environment
Torstein Bolstad, Erik Lysne, Ingrid Hallsteinsen, Elke Arenholz, Ulf L Oesterberg, Thomas Tybell
Using strain, i.e. subtle changes in lattice constant in a thin film induced by the underlying substrate, opens up intriguing new way to control materials properties. We present a study of the effects of strain on structural and ferromagnetic properties of (111)pc-oriented La0.7Sr0.3MnO3 epitaxial thin films grown on NdGaO3, SrTiO3, and DyScO3 substrates. (The subscript pc denotes the pseudo-cubic symmetry.) The results show that La0.7Sr0.3MnO3 assumes a monoclinic unit cell on NdGaO3 and DyScO3 and a rhombohedral unit cell on SrTiO3...
May 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Junyong Wang, Qinglin Deng, Mengjiao Li, Cong Wu, Kai Jiang, Zhigao Hu, Junhao Chu
To overcome inferior rate capability and cycle stability of MnO-based anode materials for lithium-ion batteries (LIBs), we reported a novel 3D porous MnO@GS/CNT composite, consisting of MnO nanoparticles homogeneously distributed on the conductive interconnected framework based on 2D graphene sheets (GS) and 1D carbon nanotubes (CNT). The distinctive architecture offers highly interpenetrated network along with efficient porous channels for fast electron transfer and ionic diffusion as well as abundant stress buffer space to accommodate the volume expansion of the MnO nanoparticles...
May 14, 2018: Nanotechnology
Qaisar Nawaz, Muhammad Atiq Ur Rehman, Andreas Burkovski, Jochen Schmidt, Ana M Beltrán, Ameen Shahid, Nina K Alber, Wolfgang Peukert, Aldo R Boccaccini
Mesoporous bioactive glass (BG) nanoparticles based in the system: SiO2 -P2 O5 -CaO-MnO were synthesized via a modified Stöber process at various concentrations of Mn (0-7 mol %). The synthesized manganese-doped BG nanoparticles were characterized in terms of morphology, composition, in vitro bioactivity and antibacterial activity. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis confirmed that the particles had spherical morphology (mean particle size: 110 nm) with disordered mesoporous structure...
May 8, 2018: Journal of Materials Science. Materials in Medicine
Xiaotong Guo, Jianming Li, Xu Jin, Yehu Han, Yue Lin, Zhanwu Lei, Shiyang Wang, Lianjie Qin, Shuhong Jiao, Ruiguo Cao
Aqueous rechargeable zinc-manganese dioxide (Zn-MnO₂) batteries are considered as one of the most promising energy storage devices for large scale-energy storage systems due to their low cost, high safety, and environmental friendliness. However, only a few cathode materials have been demonstrated to achieve stable cycling for aqueous rechargeable Zn-MnO₂ batteries. Here, we report a new material consisting of hollow MnO₂ nanospheres, which can be used for aqueous Zn-MnO₂ batteries. The hollow MnO₂ nanospheres can achieve high specific capacity up to ~405 mAh g−1 at 0...
May 5, 2018: Nanomaterials
Xiaobing Hu, Daniil A Kitchaev, Lijun Wu, Bingjie Zhang, Qingping Meng, Altug S Poyraz, Amy C Marschilok, Esther S Takeuchi, Kenneth J Takeuchi, Gerbrand Ceder, Yimei Zhu
Polytypism, or stacking disorder, in crystals is an important structural aspect that can impact materials properties and hinder our understanding of the materials. One example of a polytypic system is todorokite MnO2 , which has a unique structure among the transition metal oxides, with large ionic conductive channels formed by the metal-oxide framework that can be utilized for potential functionalization, from molecular/ion sieving to charge storage. In contrast to the perceived 3×3 tunneled structure, we reveal a coexistence of a diverse array of tunnel sizes in well-crystallized, chemically-homogeneous one-dimensional todorokite-MnO2 ...
May 7, 2018: Journal of the American Chemical Society
Shi-Yuan Liu, Shu-Jin Li, Shun Wu, Li-Jun Wang, Kuo-Chih Chou
Vanadium slag is a by-product from steelmaking process of vanadium-titanium magnetite, which mainly contains FeO, MnO, V2 O3 , and Cr2 O3 , The elements Fe and Mn are major components of Mn-Zn ferrite. The elements V and Cr are major components of V-Cr alloy. In view of the potential application in these study, a Mn0.8 Zn0.2 Fe2 O4 of high saturation magnetization (Ms = 68.6 emu/g) and low coercivity (Hc = 3.3 Oe) was successfully synthesized from the leaching solutions of vanadium slag by adding appropriate chemical reagents, ZnCl2 and MnCl2 ·4H2 O, via roasting at 1300 °C for 1 h...
April 25, 2018: Journal of Hazardous Materials
Weiren Xia, Heng Wu, Piaojie Xue, Xinhua Zhu
We report on microstructural, magnetic, and optical properties of Pr-doped perovskite manganite (La1 - x Prx )0.67 Ca0.33 MnO3 (LPCMO, x = 0.0-0.5) nanoparticles synthesized via sol-gel process. Structural characterizations (X-ray and electron diffraction patterns, (high resolution) TEM images) provide information regarding the phase formation and the single-crystalline nature of the LPCMO systems. X-ray and electron diffraction patterns reveal that all the LPCMO samples crystallize in perovskite crystallography with an orthorhombic structure (Pnma space group), where the MnO6 octahedron is elongated along the b axis due to the Jahn-Teller effect...
May 4, 2018: Nanoscale Research Letters
Wenxin Huang, Jun Li, Yunhe Xu
Porous MnO₂ was uniformly electrodeposited on nickel foam in MnSO₄ solution, which was applied as the electrode of supercapacitors. The nucleation/growth mechanisms of porous MnO₂ were investigated firstly. Then two kinds of electrochemical measuring technologies, corresponding to the cycle voltammetry (CV) and galvanostatic charge-discharge, were adopted to assess the electrochemical performance of MnO₂ electrodes. The results demonstrated that the deposition of MnO₂ on nickel foam included four stages...
May 2, 2018: Materials
Aiyun Meng, Liuyang Zhang, Bei Cheng, Jiaguo Yu
Photocatalytic CO2 conversion into solar fuels has an alluring prospect. However, the rapid recombination of photogenerated electron-hole pairs for TiO2 -based photocatalyst hinders its wide application. To alleviate this bottleneck, a ternary hybrid TiO2 -MnO x -Pt composite is excogitated. Taking advantage of the surface junction between {001} and {101} facets, MnO x nanosheets and Pt nanoparticles are selectively deposited on each facet by a facile photodeposition method. This design accomplishes the formation of two heterojunctions: p-n junction between MnO x and TiO2 {001} facet and metal-semiconductor junction between Pt and TiO2 {101} facet...
May 2, 2018: ACS Applied Materials & Interfaces
Prachi Sharma, Donald G Truhlar, Laura Gagliardi
No abstract text is available yet for this article.
April 28, 2018: Journal of Chemical Physics
Guifa Li, Pengsen Zhao, Haizhong Zheng, Lixia Yang, Shiqiang Lu, Ping Peng
Although previous papers have reported the desorption process of antimony (Sb) ions adsorbed on α-MnO2 nanomaterials, some trace Sb(OH)4 - molecular observed in experiments have not been understood clearly. Using two models as popular bulk surface and new microfacet, several parameters, such as adsorption energy, bond length, total density of state (TDOS) and activation energy, were calculated to research and analyze the catalytic reaction of Sb oxides on α-MnO2 . The results show that the bulk surface model has the "mirror effect" in revealing the catalytic property of α-MnO2 nanorods...
April 24, 2018: Journal of Hazardous Materials
Qun-Zheng Zhang, Dian Zhang, Zong-Cheng Miao, Xun-Li Zhang, Shu-Lei Chou
With the serious impact of fossil fuels on the environment and the rapid development of the global economy, the development of clean and usable energy storage devices has become one of the most important themes of sustainable development in the world today. Supercapacitors are a new type of green energy storage device, with high power density, long cycle life, wide temperature range, and both economic and environmental advantages. In many industries, they have enormous application prospects. Electrode materials are an important factor affecting the performance of supercapacitors...
April 30, 2018: Small
Zhenhua Zhou, Waqas Qamar Zaman, Wei Sun, Li-Mei Cao, Muhammad Tariq, Ji Yang
Here, we report an effective strategy to lower Ir consumption and boost the OER performance in acid by loading IrO2 onto MnO2, in which the IrO2 crystals are well dispersed and undergo a so-called z-extension Jahn-Teller distortion in the octahedral structure. Compared with IrO2, the mass activity and intrinsic activity for IrO2/MnO2 were largely increased.
April 27, 2018: Chemical Communications: Chem Comm
Dan Zhang, Liping Li, Guangshe Li, Jianming Fan, Baoyun Li
The practical applications of Mn3O4 in lithium ion batteries are greatly hindered by fast capacity decay and poor rate performance resulting from the significant volume change and low electrical conductivity. It is believed that the synthesis of nano-scaled Mn3O4 combined with carbonaceous matrix will lead to a better electrochemical performance. Herein, we report a convenient route for the synthesis of Mn3O4 nanoparticles grown in situ on hollow carbon nanofiber (denoted as HCF/Mn3O4). The small size of Mn3O4 particles combined with HCF can significantly alleviate volume change and elevate electrical conductivity; the strong chemical interaction between HCF and Mn3O4 would improve the reversibility of conversion reaction for MnO to Mn3O4 and accelerate the charge transfer...
April 26, 2018: Chemistry: a European Journal
A Krichene, W Boujelben, S Mukherjee, N A Shah, P S Solanki
In this paper, we have investigated the electrical and magnetic response of a La0.4Gd0.1Ca0.5MnO3 polycrystalline sample. This sample seems to exhibit fascinating phenomena like charge ordering, magnetic phase separation, training effects and kinetic arrest. It also shows colossal values of negative magnetoresistance (∼91.7% at 96 K under 1 T applied magnetic field), which raises the possibility of using this sample for technological applications. We have also proposed, in this work, a new empirical model to describe the evolution of resistivity and magnetoresistance as a function of magnetic field...
April 25, 2018: Physical Chemistry Chemical Physics: PCCP
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