We present a promising approach in synthetic chalcogel chemistry that is extendable to a broad variety of inorganic spacers. Polychalcogenide aerogels with ion-exchange properties are demonstrated in cobalt polysulfide. The new materials show a broad range of pore sizes and high surface area of 483 m(2)/g.
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January 2025
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
The electrocatalytic conversion of 16-electron multistep polysulfides is crucial for lithium-sulfur batteries, while it is hard to achieve compatibility between intricate sulfur reduction processes and appropriate catalysts. Herein, a tandem conversion strategy is reported to boost multi-step intermediate reactions of polysulfides transformation by designing an electrocatalyst featuring cobalt and zinc sites (Co/Zn), where the Zn serve as sites for the conversion of long-chain lithium polysulfides (LiPSs), promoting the transformation of S to LiS; the Co sites accelerate the kinetics of the subsequent reduction of LiS. This tandem catalysis method not only enhances the conversion of the initial reactants but also provides additional support for the intermediates, thereby facilitating subsequent reactions to maximize capacity.
View Article and Find Full Text PDFChem Commun (Camb)
January 2025
Department of Chemical and Materials Engineering, University of Alberta, Edmonton Alberta T6G 2 M9, Canada.
An N skeleton substituent on cobalt phthalocyanine (CoPc) was meticulously studied to redistribute the charge in phthalocyanine, improve the mass diffusion, and promote the redox kinetics of polysulfides (LiPS), resulting in a significant ultra-low capacity decay of 0.11% at 5C over 500 cycles.
View Article and Find Full Text PDFJ Colloid Interface Sci
February 2025
CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China; National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China.
Lithium-sulfur batteries (LSBs), with their high theoretical energy density and specific capacity, are considered optimal candidates for next-generation energy storage systems. However, significant challenges remain in their cycle life and efficiency for practical applications, primarily due to the shuttle effect of lithium polysulfides (LiPSs) and the poor electrical conductivity of sulfur materials. The key to addressing these challenges lies in designing materials with excellent dispersion, good electrical conductivity, and high catalytic activity.
View Article and Find Full Text PDFRSC Adv
November 2024
School of Chemical, Marine and Life Sciences, Dalian University of Technology Dalian 116023 China
Lithium-sulfur batteries (LSBs) with metal lithium as the anode and elemental sulfur as the cathode active materials have attracted extensive attention due to their high theoretical specific capacity (1675 mA h g), high theoretical energy density (2600 W h kg), low cost, and environmental friendliness. However, the discharge intermediate lithium polysulfide undergoes a shuttle side reaction between the two electrodes, resulting in low utilization of the active substances. This limits the capacity and cycle life of LSBs and further delays their commercial development.
View Article and Find Full Text PDFACS Nano
November 2024
Catalonia Institute for Energy Research─IREC, Sant Adrià de Besòs, Barcelona 08930, Spain.
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