The discharge profiles at 0.5 mA cm −2 show an increasing trend of the discharge plateau at 2.2 V versus Zn 2+ /Zn from the first to seventh cycle, using a constant voltage of 2.8 V for charging ( Fig. 1D ).
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Activating the Mn<sup>2+</sup>/Mn<sup>7+</sup> redox for a neutral Zn||Mn-compound battery with 2.2-V discharge plateau.
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The sentences
The peak strength of MnO 4 − in the 500- to 600-nm range shows a decreasing trend from the 1.3-mmol KMnO 4 solution, 40% EG PAM@DM, PAM@DM to P(S- co -M) ( 4 ).