High electrochemical activity of Li2S2 linking two-dimensional tungsten boride nanosheet enables high-loading and long-lasting lithium-sulfur batteries

Atomically Dispersed Fe–N4 and Ni–N4 Independent Sites Enable Bidirectional Sulfur Redox Electrocatalysis

“…Theoretical simulation on Ti, V, Cr, and Mn with four nitrogen atom coordination (M–N 4 ) showed strong SAC–S bonds and simultaneously weakened S–S bonds in LiPSs . Apart from the LiPSs shuttling suppression, the reaction rate for the charging process is highly determined by the oxidation of insulating Li 2 S. An insufficient catalytic effect will cause surface passivation and lower the sulfur utilization. , Progress has been achieved in enhancing the catalytic activity (especially for sulfur reduction) by regulating the coordinated ligands or controlling the distance of the SAC sites. − Nevertheless, achieving a fast bidirectional sulfur conversion process by using a single metal atom catalyst is challenging. Recently, constructing dual-atom catalysts (DACs) also has been reported as an effective strategy to propel the kinetics of oxygen reduction reaction and polysulfides conversion by tailoring the electronic structure of metal centers. , Compared with coordination engineering of the SACs and electron structure modulation of the DACs, the appropriate selection of independent dual single atoms to separate sulfur oxidation and reduction could offer a viable approach toward a high catalytic effect, which has not been reported.…”

“…20 Apart from the LiPSs shuttling suppression, the reaction rate for the charging process is highly determined by the oxidation of insulating Li 2 S. An insufficient catalytic effect will cause surface passivation and lower the sulfur utilization. 21,22 Progress has been achieved in enhancing the catalytic activity (especially for sulfur reduction) by regulating the coordinated ligands or controlling the distance of the SAC sites. 23−25 Nevertheless, achieving a fast bidirectional sulfur conversion process by using a single metal atom catalyst is challenging.…”

CDs “inserted” abundant FeB-based electrode via “local photothermal effect” strategy toward efficient overall seawater splitting

“…Due to their abundant oxygen-containing groups, carbon quantum dots (CDs) are particularly conducive to the adsorption, migration and dissociation of H + and H 2 O and effectively realize efficient hydrogen production in electrolyzed water. 12,13 Carbon quantum dots abandon (CDs): the characteristics of ordinary carbon-based materials are that they are difficult to dissolve in water, while CDs not only have good water solubility but also good light absorption and excellent photothermal control. 14 Mao et al designed CoRu/CDs catalysts with different Ru content, and the incorporation of CDs and Ru greatly changed the electronic structure of Co, thereby achieving the perfect coordination of electrical activity and H adsorption strength, ensuring the efficient generation of hydrogen.…”

Tailoring WB morphology enables d-band centers to be highly active for high-performance lithium-sulfur battery

“…Next, the migration of polysulfide moves to the lithium anode side to passivate the anode surface ("shuttle" effect) [18]. To address these shortages, these typically strategies show the use of functional materials to physically wrap and/or electrostatically anchor the polysulfides in the interior and surface of the electrode structure [1][2][3][4][5][18][19][20][21][22]. Nevertheless, the electrochemical processes of polysulfides are still unimproved, where the soluble polysulfides in electrolytes cause the insoluble final products on the anode, resulting in the exacerbation of the shuttling effect and rapid failure of Li-S batteries [8,23].…”