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Guest Post by Willis Eschenbach A short post. I came into my obsession with the climate by a side door. Back around the turn of the century, I read that the global average surface temperature was in danger of going through the roof because of increasing CO2. But when I got to thinking about it,…
FijiWillis-eschenbachLe-chatelierPacific-oceanGuest-postThe activity of electrocatalysts for the sulfur reduction reaction (SRR) can be represented using volcano plots, which describe specific thermodynamic trends. However, a kinetic trend that describes the SRR at high current rates is not yet available, limiting our understanding of kinetics variations and hindering the development of high-power Li||S batteries. Here, using Le Chatelier’s principle as a guideline, we establish an SRR kinetic trend that correlates polysulfide concentrations with kinetic currents. Synchrotron X-ray adsorption spectroscopy measurements and molecular orbital computations reveal the role of orbital occupancy in transition metal-based catalysts in determining polysulfide concentrations and thus SRR kinetic predictions. Using the kinetic trend, we design a nanocomposite electrocatalyst that comprises a carbon material and CoZn clusters. When the electrocatalyst is used in a sulfur-based positive electrode (5 mg cm−2 of S loading), the corresponding Li||S coi
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