RESEARCH / A0321
Ca2+-Preintercalated V2O5 as a Dual-Function Cathode Additive for Polyiodide Anchoring in Zn–I2 Batteries
Read the original paper · 10.1021/acsnano.5c07460 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 1. (a) TEM image of CaVO nanobelts. (b) HRTEM image of CaVO. The inset shows the corresponding FFT pattern. (c) Detailed HRTEM images of CaVO nanobelts. (d) XRD patterns of VO, NaVO, and CaVO. (e) High-resolution O 1s and V 2p XPS spectra of VO and CaVO. (f) Experimental K-edge XANES V spectra of VO, CaVO, and reference samples (V foil, VO2, and V2O5). (g) FT of the EXAFS spectra in R-space. (h) WT-EXAFS plots of CaVO. (i) WT-EXAFS plots of V foil, VO2, V2O5, and VO.
Figure 5. (a) V K-edge XANES spectra of CaVO before and after I2 loading. (b,c) V K-edge in situ XANES spectra of the CaVO cathode during discharging (b) and charging (c). (d) In situ Raman spectra of CaVO/AC@I2 and AC@I2 electrodes during the charging/discharging processs. (e) Ex situ UV−vis spectra for the electrolyte during the charging process with the CaVO/AC@I2 cathode. (f) Ex situ XPS spectra of the CaVO/AC@I2 cathode at different charging/discharging states. (g) Ex situ XRD patterns of the CaVO/AC@I2 hybrid cathode during the first cycle at different discharge and charge potentials. (h) Calculated binding energies for Zn-ion inserted in V2O5 and CaVO. (i) Zn K- edge XANES spectra of the CaVO/AC@I2 cathode at the full discharge state. (j) FT of the EXAFS spectra in R-space.