Use of a zeolite slurry to increase the charge retention of a low-cost aqueous supercapacitor

<p>To increase the viability of renewable energy technology, improvements must be made to existing energy storage devices. One such device is the supercapacitor, which is able to store energy like a battery, but with faster charge-discharge times and increased cyclability. The two main factors limiting the widespread use of supercapacitor technology are the high component cost and high rate of self-discharge. In this project, both of these aspects were addressed, and a supercapacitor was successfully constructed using a carbon black slurry containing zeolitic structures with a pore size of 4 Å to accommodate the electrolyte ions of potassium and chloride. Low-cost materials and production methods were used to create a supercapacitor with a measured capacitance of 17.25 F g⁻¹ and a coulombic efficiency of 100% determined by galvanostatic charge-discharge curve measurements.</p>

Use of a zeolite slurry to increase the charge retention of a low-cost aqueous supercapacitor

<p>To increase the viability of renewable energy technology, improvements must be made to existing energy storage devices. One such device is the supercapacitor, which is able to store energy like a battery, but with faster charge-discharge times and increased cyclability. The two main factors limiting the widespread use of supercapacitor technology are the high component cost and high rate of self-discharge. In this project, both of these aspects were addressed, and a supercapacitor was successfully constructed using a carbon black slurry containing zeolitic structures with a pore size of 4 Å to accommodate the electrolyte ions of potassium and chloride. Low-cost materials and production methods were used to create a supercapacitor with a measured capacitance of 17.25 F g⁻¹ and a coulombic efficiency of 100% determined by galvanostatic charge-discharge curve measurements.</p>

Debit Puncak Harian Tahunan Metode HSS Nakayasu dan Debit Terukur di DAS Muke Kabupaten TTSS SERVICES-CURVE NUMBER DAN DEBIT TERUKUR DI DAERAH ALIRAN SUNGAI MUKE KABUPATEN TIMOR TENGAH SELATAN

The Muke River is prone to flooding. flooding is caused by conversion in land use due to the migrating plantation system. In the Muke river, it is necessary to analyze the discharge estimation to determine the potential of water in the Muke river. In this study, the authors performed peak discharge calculation using measured calculation model and calculate. Measured calculations using discharge’s curve and calculated by using hydrographic method of synthetic unit namely Nakayasu. The results of the analysis for the calculation of discharge on the Muke river using the discharge curve obtained that the peak discharge occurred in 2012 with Qmax = 99.41 m3/s and the smallest discharge occurred in 2010 with Qmin = 13.19 m3/s, the results of the analysis for the calculation of discharge on the Muke river using the Nakayasu method obtained peak discharge occurred in 2010 with Qmax= 184.74 m3/s and the smallest discharge occurred in 2014 with Qmin = 94.33 m3/s.

Dissolution and Reprecipitation of Sulfur on Carbon Surface

Further understanding of the redox process of lithium polysulfides (PSs) on carbon surface is helpful to design Li/S batteries with better performance. “Shuttle mechanism” can explain the low coulomb efficiency and self-discharge of a Li/S battery, but it cannot explain the fact that battery performance is closely affected by electrolyte volume and sulfur load. This paper aims to reveal main redox process of PSs on surface of carbon by examining cathodic behavior with different electrolyte volume and sulfur load. SEM photos and Impedance Spectra of cathode before and after 1st discharge were compared, it was found that the discharge process is the continuous dissolution of sulfur composited with carbon into the electrolyte to form PSs, at the same time, PSs re-precipitates sulfur on the surface of cathode through disproportionation reaction to form a solid film. CV curves showed that the solid film passivates electrode, and the electrode is activated only when potential sweeps negatively and Li2S is generated. When lean electrolyte is used, there is fluctuation in CV curves, which proves that the dissolution-reprecipitation of sulfur is the main process of cathode. The discharge-charge curves of cathodes with different sulfur load were compared, it was found that there is wavy fluctuation in the discharge curve with high sulfur load, which proves again that the sulfur reaction dominates the electrode process.

Using Machine Learning for the Classification of the Remaining Useful Cycles in Lithium-Ion Batteries

In order to keep up with the increasing focus on renewable energy, the demand for new battery technology and peripherals has likewise increased greatly. Given the relatively slow rate of change of new battery chemistry and technology, it is the peripherals to the batteries that are often relied upon to provide this necessary increase in performance. The 18650 battery with Lithium-Ion internal chemistry is one of the most widely used batteries and is depended upon in many industries to provide power portability and storage. Using an extensive freely available dataset compromising of the charge cycles of 121 18650 batteries, this paper evaluates multiple algorithms’ effectiveness at predicting the remaining useful cycles of a battery from a single discharge curve. Upon evaluation of the algorithms, ‘Weighted K Nearest Neighbours’ was shown to be the most accurate model and was further improved to ensure that the maximum accuracy was acquired. Finally, a user interface was created to allow for the demonstration of a potential use case for the model. This model and user interface show the potential for easy testing of batteries to determine the number of remaining useful cycles. This makes the possibility of re-purposing or extending the initial purpose of these batteries much greater, which is preferable from both an economic standpoint and an ecological one.

Water Quality Mixing Model (WQMM) for Environmental Flow Release Monitoring

&lt;p&gt;Environmental Flow Release monitoring can be an expensive undertaking in active watercourses normally suitable for run-of-river hydropower projects.&amp;#160; In order to attain acceptable (&lt;10%) uncertainty in the derived flow series, it is necessary for a Qualified Professional (QP) to make several site visits to measure a range of flows in order to calibrate a stage-discharge (rating) curve.&amp;#160; With climate change, the need to measure drought conditions and respond appropriately is crucial for habitat health and to prevent fish stranding.&amp;#160; The current study employs a Water Quality Mixing Model (WQMM) to estimate flows at a downstream site from an existing hydropower plant using a modified constant rate mixing model.&amp;#160; This is an independent estimate of flow entirely distinct from the stage-discharge curve.&amp;#160; The method can be employed anywhere there is a sufficient mixing length and sufficiently distinct WQ traits.&amp;#160; The method can reduce both maintenance costs and flow uncertainty where Environmental Flow Release Monitoring is required.&lt;/p&gt;