Bjorgvinsdottir, SnaedisMoutzouri, PinelopiBerruyer, PierrickHope, Michael A.Emsley, Lyndon2020-08-272020-08-272020-08-272020-07-3010.1021/acs.jpcc.0c05105https://infoscience.epfl.ch/handle/20.500.14299/171143WOS:000558662500030Solid-state NMR spectroscopy is a widely used method for investigating structural and electronic properties of inorganic materials, but its use is often limited by low sensitivity. Here, we show how solvent-generated dynamic nuclear polarization can be used to efficiently hyperpolarize the surface and bulk of lithium-containing inorganic materials, through impregnation with a radical-containing solution and transfer of hyperpolarization to lithium nuclei in the materials. This is demonstrated on two lithium titanates, Li2TiO3 and Li4Ti5O12, resulting in improved sensitivity of both Li-7 and Li-6 NMR spectra of the compounds. We also show that hyperpolarization is relayed from the surface toward the bulk for both Li-7 and Li-6 and demonstrate an overall gain in sensitivity of a factor similar to 90 for the bulk spectrum of Li-6 in Li4Ti5O12. The method can in principle be applied to increase sensitivity in the surface and bulk spectra of other inorganic lithium oxides.Chemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials Sciencedynamic nuclear-polarizationanode materialshyperpolarizationspectroscopydiffusiontext::journal::journal article::research article