Recent electrochemical studies involving in situ Mössbauer spectroscopy are reviewed. The principal application has been the development of new electrodes for lithium-ion batteries, where Mössbauer spectroscopy plays an important complementary role to XRD in characterizing, and usually identifying, nanocrystalline and intermediate phases of iron and tin. Other applications include the crystallography of Prussian Blue, taken using a recently developed spectrometer for acquiring multiple spectra during continuous cyclic voltammetry, valence interconversion in clay minerals and electrochemical oxygen reduction.
