1 research outputs found
Distortion of Ions in Nanoporous Electrodes Revealed by in Situ X‑ray Absorption Spectroscopy
The
local structure of an electrolyte ion, AsF<sub>6</sub><sup>–</sup>, in a nanoporous carbon electrode was investigated
by in situ X-ray absorption spectroscopy (XAS), which was conducted
at the
As K-edge with a transmission method and a novel sample current method.
In the transmission spectra, the absorption decreased with decreasing
electrode potential, indicating the contribution of AsF<sub>6</sub><sup>–</sup> ions in and out of the nanopores. Differential
transmission spectra demonstrated that AsF<sub>6</sub><sup>–</sup> ions in the nanopores exhibit the white line at lower photon energy
compared to free ions, which was clearly demonstrated by the sample
current spectra. The change in the absorption energy was explained
by the deformation of ions in the nanopores with an assistance of
FEFF calculation