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a) Multirate galvanostatic cycling of electrodes based on HE‐PBA (in black), ME‐PBA(‐Fe) (in red), ME‐PBA(‐Mn) (in blue), ME‐PBA(‐Ni) (in green), ME‐PBA(‐Co) (in dark yellow), or ME‐PBA(‐Cu) (in purple). Specific discharge capacities versus the cycle number are shown. b) The linear response of specific peak current as function of the square root of the sweep rate for determining the apparent sodium‐ion diffusion coefficient (see the Supporting Information for more details).
