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(a) A representative SEM image of MnNiOx sample deposited on Au-Si3N4(b) Cyclic voltammograms of electrodeposited MnNiOx (blue), MnOx (red), NiOx (green), and blank Au-Si3N4 (black) in 0.1 M KOH. Data was collected at a sweep rate of 20 mV·s−1.
