Investigation of periodically driven systems by x-ray absorption spectroscopy using asynchronous data collection mode

Abstract

We report the development, testing, and demonstration of a setup for modulation excitation spectroscopy experiments at the Inner Shell Spectroscopy beamline of National Synchrotron Light Source - II. A computer algorithm and dedicated software were developed for asynchronous data processing and analysis. We demonstrate the reconstruction of X-ray absorption spectra for different time points within the modulation pulse using a model system. This setup and the software are intended for a broad range of functional materials which exhibit structural and/or electronic responses to the external stimulation, such as catalysts, energy and battery materials, and electromechanical devices.

Identification of dopant site and its effect on electrochemical activity in Mn-doped lithium titanate

“…In pristine LTO, tetrahedral 8 a sites are believed to be occupied by Li + ions, while the octahedral 16 d sites are randomly occupied by Li + and Ti 4+ ions with a 1:5 ratio [26]. Since Li + ions migrate through the LTO lattice via tetrahedral/octahedral sites, the occupancy of these sites by dopants should have an important effect on Li ion transport and thus electrochemical properties of LTO electrodes [8,9,11,27]. For example, the doping on the tetrahedral (8 a ) site is expected to be detrimental for Li ion conductivity due to the blocking of Li ion diffusion pathways [13].…”

Harnessing photo/electro-catalytic activityvianano-junctions in ternary nanocomposites for clean energy

“…106 In another example, 1at.% doped Mn in lithium titanate showed ~ 20 % change in the electrochemical performance due to Mn 2+ occupation in tetrahedral (8a) sites. 107 Furthermore, various charge transfer pathways in such sophisticated designed systems such as mediator-induced interfacial charge transfer 108,109 can be probed by synchrotron radiation-based technologies as it has turned out to be an effective tool with remarkably high spatial/temporal-resolution, 110,111 thanks to its energy tunability and high brilliance. Thus, the elusive contact mechanism between active photocatalyst and co-catalyst can be revealed via simultaneous spectro-microscopic determinations empowered by synchrotron-based advanced methods for investigating the structure-property-function relationships.…”

The Inner Shell Spectroscopy beamline at NSLS-II: a facility for in situ and operando X-ray absorption spectroscopy for materials research

“…With the open architecture of the asynchronous DAQ system, data from the in situ reaction environment can be also captured and correlated with the XAS measurements para-meters, allowing for complex experimental schemes (Singh et al, 2018;Qu et al, 2021).…”