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Ex situ XPS analysis of HE‐PBA‐based electrodes before/after cycling. Comparison of the Fe 2p, Mn 2p, Ni 2p, Cu 2p, and Co 2p core‐level spectra for the material in the pristine (in cyan), fully desodiated (charged to 4.2 V, in brown), and resodiated (discharged to 2.0 V, in black) states.
