scholarly journals STABILITY ENHANCEMENT OF ALUMINUM-AIR BATTERY

2021 ◽  
Vol 16 (10) ◽  
Author(s):  
Syed Mazhar Shah
Keyword(s):  
Pure Aluminum ◽  
Reduction Reaction ◽  
Oxidation Reduction ◽  
Air Supply ◽  
Room Condition ◽  
Carbon Coated ◽  
Coated Cell ◽  
Air Battery ◽  
The Stability ◽  
Stability Enhancement

A comparative analysis is presented for an aluminum-air battery with a carbon-coated and non-coated anode made of 4N pure aluminum with the purpose to enhance the stability of the battery. The carbon coating was proven to be quite effective which lasted almost two times more than the non-coated cell with little to almost no effect on the electrochemical behavior. A method was also proposed to limit the self-discharge electrode corrosion of the aluminum-air battery by limiting the oxygen supply to the cell from atmospheric air. The blockage of the air supply limits the oxidation-reduction reaction necessary for cell operation. For that purpose, the cell was tested in vacuum condition for 25 days which showed quite impressive results when compared with the cell kept in a non-vacuum room condition. It had retained its potential as well as resisted the corrosion quite well with almost negligible weight loss and byproduct accumulation

scholarly journals Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1160
Author(s):  
Mohammad Ali Dashtaki ◽  
Hamed Nafisi ◽  
Amir Khorsandi ◽  
Mojgan Hojabri ◽  
Edris Pouresmaeil
Keyword(s):  
Harmonic Distortion ◽  
Synchronous Generator ◽  
Voltage Source ◽  
Small Signal ◽  
Voltage Source Inverter ◽  
Nonlinear Loads ◽  
Virtual Inertia ◽  
The Stability ◽  
Stability Enhancement ◽  
Oscillation Damping

In this paper, the virtual synchronous generator (VSG) concept is utilized in the controller of the grid-connected dual two-level voltage source inverter (DTL VSI). First, the topology of the VSG and the DTL VSI are presented. Then, the state-space equations of the DTL VSI and the grid-connected two-level voltage source inverter (TL VSI), regarding the presence of the phase-locked loop (PLL) and the VSG, are given. Next, the small-signal modeling of the DTL VSI and the TL VSI is realized. Eventually, the stability enhancement in the DTL VSI compared with the TL VSI is demonstrated. In the TL VSI, large values of virtual inertia could result in oscillations in the power system. However, the ability of the DTL VSI in damping oscillations is deduced. Furthermore, in the presence of nonlinear loads, the potentiality of the DTL VSI in reducing grid current Total Harmonic Distortion (THD) is evaluated. Finally, by using a proper reference current command signal, the abilities of the DTL VSI and the TL VSI in supplying nonlinear loads and providing virtual inertia are assessed simultaneously. The simulation results prove the advantages of the DTL VSI compared with the TL VSI in virtual inertia emulation and oscillation damping, which are realized by small-signal analysis.

Nitrogen and phosphorus co-doped ultrathin carbon nanosheets as superior cathode catalysts of Zn-air battery.

2021 ◽  
Author(s):  
Aling Chen ◽  
Qingfeng Yi ◽  
Kuang Sheng ◽  
Yuebing Wang ◽  
Jiangchuan Chen ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Oxygen Reduction Reaction ◽  
Reduction Reaction ◽  
Nitrogen And Phosphorus ◽  
Carbon Nanosheets ◽  
Cathode Catalysts ◽  
Metal Free ◽  
Air Battery ◽  
Storage Technologies ◽  
Co Doped

Exploring efficient metal-free electrocatalyst for oxygen reduction reaction (ORR) plays a significant role in a variety of storage technologies and renewable energy conversion. In this work, we firstly compounded a...

scholarly journals Superior FexN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

2020 ◽  
Vol 9 (1) ◽  
pp. 843-852
Author(s):  
Hunan Jiang ◽  
Jinyang Li ◽  
Mengni Liang ◽  
Hanpeng Deng ◽  
Zuowan Zhou
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Active Sites ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Acidic Media ◽  
Onset Potential ◽  
Acidic And Alkaline Media ◽  
The Stability

AbstractAlthough Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

The Stability Enhancement of Nitrile Hydratase from Bordetella petrii by Swapping the C-terminal Domain of β subunit

2015 ◽  
Vol 178 (8) ◽  
pp. 1481-1487 ◽  
Author(s):  
Weifeng Sun ◽  
Longbao Zhu ◽  
Xianggui Chen ◽  
Lunjie Wu ◽  
Zhemin Zhou ◽  
...  
Keyword(s):  
Nitrile Hydratase ◽  
Β Subunit ◽  
Terminal Domain ◽  
The Stability ◽  
Stability Enhancement

Pseudomonas aeruginosa transition from environmental generalist to human pathogen

2021 ◽  
Vol 13 (1) ◽  
pp. 11
Author(s):  
Gabriela Vasco ◽  
Gabriel Trueba
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Human Body ◽  
Biofilm Formation ◽  
Reduction Reaction ◽  
Human Pathogen ◽  
Opportunistic Bacteria ◽  
Oxidation Reduction ◽  
Mammalian Tissues ◽  
Oxidation Reduction Reaction ◽  
Source Sink

Opportunistic bacteria Pseudomonas aeruginosa is one of the major concerns as an etiological agent of nosocomial infections in humans. Many virulence factors used to colonize the human body are the same as those used by P. aeruginosa to thrive in the environment such as membrane transport, biofilm formation, oxidation/reduction reaction, among others. P. aeruginosa origin is mainly from the environment, the adaptation to mammalian tissues may follow a source-sink evolution model; the environment is the source of many lineages, some of them capable of adaptation to the human body. Some lineages may adapt to humans and go through reductive evolution in which some genes are lost.  The understanding of this process may be critical to implement better methods to control outbreaks in hospitals.

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