{Current|Present|Existing} {methods|techniques|strategies|approaches|procedures|solutions} for CO2 capture and concentration (CCC) are {energy|power} intensive {due to|because of|as a result of|on account of|resulting from|as a consequence of} their reliance on thermal cycles, {which are|that are} intrinsically Carnot {limited|restricted} in efficiency. In contrast, electrochemically driven CCC (eCCC) can operate at {much|a lot|significantly|considerably|substantially|a great deal} {higher|greater|larger} theoretical efficiencies. {However|Nevertheless|Nonetheless|Even so|On the other hand|Having said that}, most reported systems are sensitive to O2, precluding their {practical|sensible} use. {In order to|To be able to|As a way to|In an effort to|So as to|So that you can} {achieve|attain|accomplish|obtain|realize|reach} O2 {stable|steady} eCCC, we pursued the {development|improvement} of molecular redox carriers with reduction potentials {positive|good|optimistic|constructive} {of the|from the|in the|on the|with the|of your} O2/O2- redox couple. Prior efforts to chemically modify redox carriers to operate at milder potentials resulted {in a|inside a|within a} loss in CO2 binding. To overcome these limitations, we {used|utilized|employed|utilised|applied|made use of} {common|typical|frequent|widespread|prevalent|popular} alcohols additives to anodically shift the reduction {potential|possible|prospective} of a quinone redox carrier, {2|two},{3|three},{5|five},6-tetrachloro-p-benzoquinone (TCQ), by {up to|as much as} 350 mV, conferring O2 stability. Intermolecular hydrogen-bonding interactions {to the|towards the|for the} dianion and CO2-bound {forms|types} of TCQ {were|had been|have been} correlated to alcohol pKa to {identify|determine|recognize} ethanol {as the|because the} optimal additive, {as it|because it|since it} imparts {beneficial|advantageous|helpful|useful|valuable|effective} {changes|modifications|adjustments|alterations} to {both|each} the reduction {potential|possible|prospective} and CO2 binding {constant|continuous|continual}, the two {key|important|crucial|essential} properties for eCCC redox carriers. We demonstrate a {full|complete} cycle of eCCC in aerobic simulated flue gas {using|utilizing|making use of|employing|working with|applying} TCQ and ethanol, two commercially {available|accessible|obtainable|offered|readily available|out there} compounds. {Based on|According to|Depending on|Determined by} the {system|method|program|technique} properties, an estimated minimum of 21 kJ/mol is {required|needed|necessary|essential|expected} to concentrate CO2 from 10% to 100%, or twice as {efficient|effective} as state-of-the-art thermal amine capture systems {and other|as well as other|along with other|and also other} reported redox carrier-based systems. {Furthermore|Moreover|In addition|Additionally}, this {approach|method|strategy} of {using|utilizing|making use of|employing|working with|applying} hydrogen-bond donor additives is {general|common|basic} {and can|and may} be {used|utilized|employed|utilised|applied|made use of} to tailor the redox properties of other quinones/alcohol combinations for {specific|particular|certain|distinct|precise} CO2 capture applications. Price of 19715-49-2 Tributyl-2-thiazolylstannane uses PMID:24190482
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