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Mrinal Kumar Sarma, Mohd Golam Abdul Quadir, Rupam Bhaduri, Sharbani Kaushik, Pranab Goswami
Combined power generation and waste degradation through microbial fuel cell (MFC) technology is emerging as an attractive solution for controlling pollution in water bodies. Cyanobacteria as fuel cell catalysts for such shared energy activities are not well studied even though these possess robust metabolic systems supporting exo-electrogenicity, biodegradation of toxic compounds, and their survival under wide environmental conditions. Herein, a dual chambered (50 ml each) MFC assembled with Synechococcus sp...
July 31, 2018: Biosensors & Bioelectronics
Dengjie Zhong, Xinrong Liao, Yaqi Liu, Nianbing Zhong, Yunlan Xu
It is of significant importance to simultaneously shorten the start-up time and enhance the electricity generation performance for practical application of microbial fuel cell (MFC). In this paper, the polydiallyldimethylammonium chloride (PDDA) modified carbon felt (PDDA-CF) electrode was prepared and used as the anode of PDDA-MFC. The anode significantly enhanced the start-up speed and electricity generation and dye wastewater degradation performances of the PDDA-MFC. The start-up time of PDDA-MFC is only 9 h, which is only 7...
August 1, 2018: Biosensors & Bioelectronics
Akihiro Okamoto, Annette Rowe, Xiao Deng, Kenneth H Nealson
Anaerobic respiration coupled with electron transport to insoluble minerals (referred to as extracellular electron transport [EET]) is thought to be critical for microbial energy production and persistence in many subsurface environments, especially those lacking soluble terminal electron acceptors. While EET-capable microbes have been successfully isolated from various environments, the diversity of bacteria capable of EET is still poorly understood, especially in difficult-to-sample, low energy or extreme environments, such as many subsurface ecosystems...
July 24, 2018: Journal of Visualized Experiments: JoVE
Beidou Guo, Liangqiu Tian, Wenjing Xie, Aisha Batool, Guancai Xie, Qin Xiang, Saad Ullah Jan, Rajender Boddula, Jian Ru Gong
Because of inefficient charge utilization caused by localized π-electron conjugation and large exciton binding energy, the photoelectrochemical water-splitting efficiency of organic polymers is seriously limited. Taking the graphitic carbon nitride (g-CN) polymer as an example, we report a novel photoanode based on a vertically aligned g-CN porous nanorod (PNR) array prepared in situ, using a thermal polycondensation approach, with anodic aluminum oxide as the template. The g-CN PNR array exhibits an excellent photocurrent density of 120...
August 13, 2018: Nano Letters
Kento Sakai, Yuki Kitazumi, Osamu Shirai, Kenji Kano
No abstract text is available yet for this article.
August 10, 2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Dzmitry Melnikau, Saioa Elcoroaristizabal, Alan George Ryder
The accurate fluorescence analysis of complex, multi-fluorophore containing proteins requires the use of multi-dimensional measurement techniques. For the measurement of intrinsic fluorescence from tyrosine (Tyr) and tryptophan (Trp) one needs tunable UV excitation and for steady-state measurements like Excitation Emission Matrix (EEM) simple pulsed Xe lamps are commonly used. Unfortunately, simultaneous multi-dimensional wavelength and time resolved measurement of intrinsic protein fluorescence in the 260 to 400 nm spectral range are challenging and typically required the use of very complex tunable laser systems or multiple single excitation wavelength sources...
August 13, 2018: Methods and Applications in Fluorescence
Juanhong Wang, Chen Song, Zhiwei He, Chaohuang Mai, Gancheng Xie, Lan Mu, Yangke Cun, Jiali Li, Jian Wang, Junbiao Peng, Yong Cao
All-solution-processed pure formamidinium-based perovskite light-emitting diodes (PeLEDs) with record performance are successfully realized. It is found that the FAPbBr3 device is hole dominant. To achieve charge carrier balance, on the anode side, PEDOT:PSS 8000 is employed as the hole injection layer, replacing PEDOT:PSS 4083 to suppress the hole current. On the cathode side, the solution-processed ZnO nanoparticle (NP) is used as the electron injection layer in regular PeLEDs to improve the electron current...
August 12, 2018: Advanced Materials
Sebastian H Doeltgen, Lakkari Rigney, Charles Cock, Taher Omari
BACKGROUND: Anodal transcranial direct current stimulation (tDCS) has demonstrated effects on corticobulbar excitability and swallowing function as assessed via clinical rating scales in stroke cohorts. Biomechanical effects of anodal tDCS on swallowing remain largely unexplored. We investigated how anodal tDCS applied over the floor of mouth (FOM) representation on the primary motor cortex affects swallowing biomechanics in healthy participants. METHODS: Anodal and sham tDCS were applied for 20 minutes at 1...
August 13, 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
Yu-Han Hsieh, Ming-Yuan Lee, Ching-Chou Wu
A simple and fast one-step electrooxidative method has been developed to monolithically produce a copper phosphate (Cu3 (PO4 )2 ) compound on a disposable copper tape, which can be integrated with high performance liquid chromatography (HPLC) for the estimation of fish freshness. The Cu3 (PO4 )2 compound of flake-like nanostructures was formed by applying a first anodic peak potential at the copper tape for 10 min in a 1 M sodium dihydrogen phosphate (NaH2 PO4 ) (pH 5.0) solution. The Cu3 (PO4 )2 electrodes can detect the oxidative reaction of histidine and histamine in 20 mM NaH2 PO4 solutions with pH 5...
December 15, 2018: Food Chemistry
Asael Gonzalez, Stephane Vidal, Maurizio Ugliano
Chemical and electrochemical changes associated with controlled oxidation were measured in thirteen commercial white wines, in order to evaluate the potential of linear sweep voltammetry to provide relevant information on the oxidative behavior of individual wines. For a given amount of oxygen consumed, substantial diversity of oxidative behaviors was observed. A good correlation (R2  = 0.69) was observed between the rate of O2 consumption of individual wines and the total charged passed during linear sweep voltammetry, but not with their Folin-Ciocalteu values...
December 15, 2018: Food Chemistry
Jing Huang, Xuekun Tang, Zishun Li, Kun Liu
We report a metal-organic framework-derived Co9 S8 nanoflakes on reduced graphene oxide sheet composites as an advanced sodium-ion battery anode. Using a galvanostatic intermittent titration technique, we reveal that the sodium diffusion coefficient of the composite is higher than that of its counterpart. Ex-situ scanning electron microscopy images suggest the excellent mechanical stability of Co9 S8 nanoflakes on the reduced graphene oxide sheet electrode during cycling, thereby facilitating cyclic stability...
August 4, 2018: Journal of Colloid and Interface Science
Fatemeh Yavari, Christoph van Thriel, Michael A Nitsche, Min-Fang Kuo
Toluene is a well-known neurotoxic organic solvent and a major component of many industrial and commercial products such as adhesives, paint thinners and gasoline. Many workers are regularly exposed to toluene in their working environment and occupational exposure limits (OELs) have been set to avoid adverse health effects. These OELs or short-term exposure limits vary from 14 to 300 ppm across countries partly due to heterogeneity of the findings from animal and human studies about its neurotoxic effects and the evaluation of the adversity of the underlying mechanisms...
August 10, 2018: Archives of Toxicology
Peng Cheng, Rui Shan, Hao-Ran Yuan, Li-Fang Deng, Yong Chen
In this study, a trehalose lipid was added to a Rhodococcus pyridinivorans-inoculated MFC to improve the power output by enhancing electron transfer. Upon trehalose lipid additions of different concentrate from 0 to 20 mg/L, the maximum power density increased from 54.7 mW/m2 to 324.4 mW/m2 (5.93 times) while the corresponding current density was 3.66 times increased from 0.35 A/m2 to 1.28 A/m2 . Cyclic voltammetry analysis revealed that the addition of trehalose lipid increased the electron transfer performance, while electrochemical impedance spectroscopy results proved a decrease in internal resistance...
August 4, 2018: Bioresource Technology
Kyungho Kim, Geoffrey Daniel, Vadim G Kessler, Gulaim A Seisenbaeva, Vilas G Pol
Nano α-MnO₂ is usually synthesized under hydrothermal conditions in acidic medium, which results in materials easily undergoing thermal reduction and offers single crystals often over 100 nm in size. In this study, α-MnO₂ built up of inter-grown ultra-small nanoflakes with 10 nm thickness was produced in a rapid two-step procedure starting via partial reduction in solution in basic medium subsequently followed by co-proportionation in thermal treatment. This approach offers phase-pure α-MnO₂ doped with potassium (cryptomelane type K0...
August 9, 2018: Nanomaterials
Naresh Mameda, Hyeona Park, Kwang-Ho Choo
Versatile electrochemical reactions are effective for removing a wide range of water contaminants. This study focuses on the development and testing of bifunctional electrocatalytic filter anodes as reactive and separating media for the simultaneous removal of refractory dissolved organic and particulate contaminants from real wastewater effluents. The results show that the TiO2 particle interlayers formed between the Ti fiber support and the top composite metal oxide catalyst layers assist in reducing filter pores to an effective size range that enables removal of most particulates within the wastewater...
August 4, 2018: Water Research
Yu Wang, Yuhong Jin, Chenchen Zhao, Erzhuang Pan, Mengqiu Jia
SnO2 is considered as one of the most promising alternative anode materials for lithium ion batteries (LIBs) and sodium ion batteries (SIBs) due to high specific capacity, low discharge voltage plateau and environmental friendliness. In this work, 1D ultrafine SnO2 nanorods anchored on 3D graphene aerogel (SnO2 NRs/GA) composite is prepared through a simple reduction-induced self-assembly method in the solution of graphene oxide (GO), Vitamin C and SnO2 nanoparticles. Vitamin C plays an important role in the reduction of GO...
August 6, 2018: Journal of Colloid and Interface Science
Jun Yano, Kenta Suzuki, Chikara Tsutsumi, Michiaki Mabuchi, Nobuki Hayase, Akira Kitani
Both light and a redox mediator riboflavin (RF) were utilized to promote the electro-oxidation of an NADH model compound (1-benzyl-1,4-dihydronicotinamide, BNAH), which is a key process for enzymatic biofuel cells to obtain a high performance. At the cathode, H+ ions were simultaneously reduced to produce H2 gas. To elucidate the cell reactions of this photogalvanic cell, which is significant information about the fabrication of enzymatic biofuel cells with a high performance, the effect of the BNAH and RF concentrations on the cell current, the light wavelength dependence on the current, and reduction of the RF concentration were evaluated...
August 10, 2018: Bioscience, Biotechnology, and Biochemistry
Pai Li, Zhenyu Li, Jinlong Yang
Alkali metal atom adsorption energy is an important descriptor for anode material design. In this study, an energy decomposition model is developed to provide valuable insights in understanding how the adsorption behavior can be tuned. As an example, Li adsorption on graphene enhanced by a tensile strain is analyzed based on this model. Such an analysis then motivates us to find a system with similar electronic structure but larger lattice parameter compared to graphene as an anode material. Our first principles calculations indicate that B2S, as an isoelectronic system of graphene, is a good candidate...
August 10, 2018: Journal of Physical Chemistry Letters
Rosy Sharma, Sabine Akabayov, Michal Leskes, Malachi Noked
Out of many challenges in the realization of lithium-O2 batteries (LOB), the major is to deal with the instability of the electrolyte and the cathode interface under the stringent environment of both oxygen reduction and evolution reactions. Lithium nitrate was recently proposed as a promising salt for LOB, due to its capability to stabilize lithium anode by formation of solid electrolyte interphase (SEI), its low level of dissociation in aprotic solvents and its catalytic effect towards OER in rechargeable LOB...
August 10, 2018: ACS Applied Materials & Interfaces
Chong Yan, Yu-Xing Yao, Xiang Chen, Xin-Bing Cheng, Xue-Qiang Zhang, Jia-Qi Huang, Qiang Zhang
Lithium metal anode is strongly regarded as a promising candidate in next-generation energy storage devices. Lithium nitrate (LiNO3) is widely applied as an effective additive in ether electrolyte to increase the interfacial stability in batteries with lithium metal anodes, however, LiNO3 is rarely involved in high-voltage-window carbonate electrolyte for its poor solubility. Herein, we realize the dissolution of LiNO3 in carbonate electrolyte through an effective solvation regulation strategy. LiNO3 can be directly dissolved in ethylene carbonate/diethyl carbonate electrolyte by adding trace amounts of copper fluoride as a dissolution promoter...
August 10, 2018: Angewandte Chemie
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