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(a) CV curves of α-Fe2O3 electrode at 2 mV s−1. (b) XRD patterns of the electrodes before activation (black line), after activation in charge state (red line), and after activation in discharge state (blue line). (c) TEM image of FeOOH nanoparticles. Scale bar, 100 nm. (d) HRTEM images of FeOOH nanoparticles. Scale bar, 5 nm. (e,f) Fe2p and O 1s XPS core-level spectra of FeOOH nanoparticles.
