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Unveiling Pseudocapacitive Charge Storage Behavior in FeWO 4 Electrode Material by Operando X‐Ray Absorption Spectroscopy

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Academic year: 2021

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Figure  2:  Cyclic  voltammogram  of  the  iron  tungstate  electrode  cycled  at  10  mV.s -1   in  5M  LiNO 3   aqueous  electrolyte  (reference  electrode  Ag/AgCl;  counter  electrode:  platinum  wire)
Figure  3:  (a)  Operando  Fe  K-edge  XANES  spectra  for  the  FWO  electrode,  compared  to  reference  samples  (NH 4 ) 2 Fe(SO 4 ) 2   (Fe 2+ ,  teal),  Fe 3 O 4   (Fe 2.67 +,  light  blue)  and  Fe 2 O 3   (Fe 3+ ,  grey)
Figure 4: Evolution of the operando XANES spectra for the FWO electrode at (a) Fe K-edge  and (b) W L 3 -edge during 9 cycles between 0 V vs
Figure 5: Evolution of the (a) Fe K-edge energy and mean Fe oxidation state and (b) W L 3 - -edge as a function of electrode potential when cycled between 0 V vs
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