Oh, Si Hyoung Adams, Brian D. Lee, Boeun Nazar, Linda F. 2024-01-20T07:04:54Z 2024-01-20T07:04:54Z 2021-09-04 2015-04-14 0897-4756 https://pubs.kist.re.kr/handle/201004/125550 Mesoporous, nanocrystalline metallic lead ruthenium oxide (a pyrochlore) was syntheSized through the formation of a mesostructured cohydroxide network via liquid crystal templating, and subsequent soft chemical oxidation that Crystallizes the oxide at low temperature. The stable S+I- interaction chemistry responsible for the templating methodology is elucidated. The formation of a disordered mesopotous structure with a pore volume of 0.18 cm(3)/g and walls comprised of nanocrystallites was confirmed by X-ray diffraction and conductivity, N-2 isotherm measurements, and TEM observations. The resistivity of mesopotous oxide at room temperature was 0:046 Omega.cm, only 2 orders of magnitude less than the single crystal; value, and one of the only two porous metallic oxides that are known to date. The electrocatalytic properties Of this material for oxygen reduction and evolution in aqueous and nonaqueous media were evaluated by cyclic vatarnmetry, chronoariaperometty, and linear sweep vdltarninetry. These techniques show that the synthesized pyttichlore lowers the overall oxidation voltage by 0.7 relative to carbon m nonaqueous, Li+ containing electrolyte. This is the result of its ability to both completely oxidize Li2O2 (at a relatively low potential) and electrocatalytically oxidize all known side products formed from electrolyte decomposition in the Li-O-2 battery. This further helps to explain the nature of "electrOcatalysis" in this system. English AMER CHEMICAL SOC NONAQUEOUS LI-O-2 BATTERIES LITHIUM-OXYGEN BATTERIES OXIDE PYROCHLORES MESOSTRUCTURED MATERIALS FUEL-CELLS TIN OXIDE REDUCTION ELECTRODE ELECTROCATALYSIS PB2RU2O6.5 Direct, Soft Chemical Route to Mesoporous Metallic Lead Ruthenium Pyrochlore and Investigation of its Electrochemical Properties Article 10.1021/cm5034904 1 CHEMISTRY OF MATERIALS, v.27, no.7, pp.2322 - 2331 CHEMISTRY OF MATERIALS 27 7 2322 2331 scie scopus 000353176100010 2-s2.0-84927722360 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article NONAQUEOUS LI-O-2 BATTERIES LITHIUM-OXYGEN BATTERIES OXIDE PYROCHLORES MESOSTRUCTURED MATERIALS FUEL-CELLS TIN OXIDE REDUCTION ELECTRODE ELECTROCATALYSIS PB2RU2O6.5 Li-air batteries catalyst pyrochlore soft templting