Electrodeposition of Mn-Co/Polypyrrole Nanocomposites: An Electrochemical and In Situ Soft-X-ray Microspectroscopic Investigation

Abstract

Abstract:Understanding the lateral variations in the elemental and chemical state of constituents induced by electrochemical reactions at nanoscales is crucial for the advancement of electrochemical materials science. This requires in situ studies to provide observables that contribute to both modeling beyond the phenomenological level and exactly transducing the functionally relevant quantities. A range of X-ray coherent diffraction imaging (CDI) approaches have recently been proposed for imaging beyond the diffraction limit with potentially dramatic improvements in time resolution with chemical sensitivity. In this paper, we report a selection of ptychography results obtained in situ during the electrodeposition of a metal-polymer nanocomposite. Our selection includes dynamic imaging during electrochemically driven growth complemented with absorption and phase spectroscopy with high lateral resolution. We demonstrate the onset of morphological instability feature formation and correlate the chemical state of Mn with the local growth rate controlled by the current density distribution resulting from morphological evolution.

Opposite Effects of SiO2 Nanoparticles on the Local α and Larger-Scale α’ Segmental Relaxation Dynamics of PMMA Nanocomposites

“…Compared with the traditional polymer composites, polymer nanocomposites produced by adding various nanoparticles to polymer matrices have received much attention due to their significantly improved physicochemical properties, such as mechanical performance or electrical conductivity [1,2,3]. To date, a number of studies on modifications of nanoparticles such as size, fraction, and surface decoration have been performed to reveal the effect of nanoparticles and uncover the mechanisms of the properties’ enhancement of polymer nanocomposites.…”

Synchrotron radiation based operando characterization of battery materials

“…Among them, fluorescence detection results in elemental and chemical analysis with the best sensitivity and it is therefore often used as a complementary technique to simultaneous STXM. 133 Another advantage of STXM is that since there are no lenses placed after the sample all the photons that reach it contribute to the image formation. This minimizes the necessary total dose delivered to the sample to achieve an acceptable signal-to-noise ratio and contrast, but not the resulting dose per unit time, which has to be always taken into account in the STXM scheme to consider possible beam damage of the sample.…”

What Happens to MnO2 When It Comes in Contact with Zn2+? An Electrochemical Study in Aid of Zn/MnO2‐Based Rechargeable Batteries

“…is reached: this behavior is common in the literature on ORR electrocalalysts by manganese oxide-based materials, and has been attributed to the presence of a multiplicity of catalytic sites. [77][78][79] The fact that the same material yields a well-defined limiting current in alkaline electrolyte, but not in the neutral sulfate one, is a clear indication of the difference in ORR mechanism in the two ambients. The number of transferred electrons n was estimatedwithin experimental and fitting errorsto be %4, in accord with.…”