Regulatory Mechanisms in Biosystems (E-Journal - Dnipro National University)
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Bobby Galvan at Sembradores de Amistad
No full textBobby Galvan speaking at the poduim at the Sembradores de Amista
The impacts of meditation vs mindfulness on stress levels of nurses in the hospitals post-COVID-19
No full textDue to the concerns regarding mental health awareness and increasing burnout from COVID-19 within the nursing field, the question was raised: how does a group activity like practicing mindfulness for 15min/day or meditation for 15min/day affect fatigue and ultimately, patient outcomes
Rafael Galvan Sr. as young man
No full textRafael Galvan, Sr. as young man posed staning behind a chai
Topic 4.5: Static and finals
No full textIn this module, you will learn about:
Static Class Attributes,
Static Methods,
Final Class Attribute
Elizabeth Goad at Autorama
No full textElizabeth Goad smiling at the Autorama posing while sitting in a ca
Ralph Galvan and Orchestra at the Hamilton Hotel
No full textRalph Galvan and Orchestra playing at the Hamilton Hote
Improving the voltage and lifetime of aqueous redox flow batteries utilizing the organometallic catholyte iron (II/III) Tris-2,2’-Bipyridine
No full textA Thesis Submitted In Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE in Chemistry Department of Environmental Science from Texas A&M University-Corpus Christi.Renewable energy, such as solar and wind, helps move away from the reliance on fossil fuels, which causes the significant issue of atmospheric carbon dioxide and greenhouse gas emissions. One of the biggest challenges of renewable energy is the lack of storage options so it can be readily available when it is inaccessible (i.e., when environmental conditions change, and solar and wind energy are not accessible). Of the potential energy storage options, electrochemical storage, specifically battery storage, has become popular because of the potential for long-term storage they provide. Some examples of battery storage include lithium-ion and redox flow. While redox flow batteries (RFBs) are an attractive option for long-term energy storage, a lack of suitable high-potential catholyte species hinders the development. Hydrolysis of the charged (oxidized) form typically occurs when the catholyte’s redox potential approaches that of water, leading to performance degradation. Here we show that hydrolysis of an oxidized (charged) organometallic catholyte, which normally leads to severe voltage losses, can be curtailed through interactions with oxidized carbon surfaces. We discovered that the addition of activated carbon cloth (ACC) to the reservoir of low-cost, high-potential iron (II/III) tris-2,2’-bipyridine ([Fe(bpy)3]2+/3+) catholyte-limited aqueous redox flow batteries extends their lifetime and boosts discharge voltage. A similar effect is observed when the cathode is electrochemically oxidized (overcharged) on the first cycle and by modifying electrolyte pH. Oxidized carbons appear to modify the structure of the charged catholyte’s hydrolysis product, the dimer µ-O-[FeIII(bpy)2(H2O)]24+, and/or change the solution pH, permitting its reduction at a more favorable redox potential than in the ACC-free catholyte. Near-neutral-pH RFBs employing 1,1?-bis(3-sulfonatopropyl)-4,4?- bipyridinium ((SPr)2V) anolyte in excess and the with the [Fe(bpy)3]2+/3+ catholyte containing ACC exhibited high-voltage discharge for 600 cycles (41 days) with no discernable capacity fade. We also demonstrate that a zero-pot, solvent-free synthetic method yields long-lived [Fe(bpy)3]2+/3+-based RFBs when employing the novel voltage-boosting methods.ChemistryCollege of Scienc
