Fig. 4: Product analysis for the electrochemical reduction of U(VI) by Ga-Nx-C in solutions containing selected secondary metal ions.
From: Secondary metal ion-induced electrochemical reduction of U(VI) to U(IV) solids
a Photograph showing no solids were generated through electrocatalysis on Ga-Nx-C in ~100 ppm uranium-spiked sodium nitrate solution. b, c U L3-edge XANES and EXAFS spectra of Ga-Nx-C after electrocatalytic uranium extraction in the presence of Na+, K+, or Cs+ ions (b inset: expanded view showing the U valence states). d PXRD pattern of the electrocatalytically generated products in ~100 ppm uranium-spiked cadmium nitrate solution. e U L3-edge XANES spectra of Ga-Nx-C after electrocatalytic uranium extraction in the presence of Mg2+, Ca2+, Sr2+, Ba2+, Cd2+, or Pb2+ ions (inset: expanded view showing the U valence states). f U L3-edge EXAFS curves and fitting results for Ga-Nx-C after uranium extraction in ~100 ppm uranium-spiked cadmium nitrate solution. g PXRD pattern of electrocatalytically generated Ce0.8U0.2O2. h HRTEM image of electrocatalytically generated Ce0.8U0.2O2 (inset: expanded view showing the lattice spacing). i U L3-edge EXAFS curves and fitting results for electrocatalytically generated Ce0.8U0.2O2. The reference data for UO2 and UO2(NO3)2·6H2O in (b, c) were taken from our previous work28.
