Establishing generic catalyst design principles by identifying structural features of materials that influence their performance will advance the rational engineering of new catalytic materials. In this study, by investigating metal-substituted manganese oxide (spinel) nanoparticles, Mn O :M (M=Sr, Ca, Mg, Zn, Cu), we rationalize the dependence of the activity of Mn O :M for the electrocatalytic oxygen reduction reaction (ORR) on the enthalpy of formation of the binary MO oxide, Δ H°(MO), and the Lewis acidity of the M substituent. Incorporation of elements M with low Δ H°(MO) enhances the oxygen binding strength in Mn O :M, which affects its activity in ORR due to the established correlation between ORR activity and the binding energy of *O/*OH/*OOH species. Our work provides a perspective on the design of new compositions for oxygen electrocatalysis relying on the rational substitution/doping by redox-inactive elements.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10108258 | PMC |
http://dx.doi.org/10.1002/anie.202217186 | DOI Listing |
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