Electrochimica Acta p. 124 - 131 (2012)
Update date:2022-08-30
Topics:
Chu, Yi-Hsuan
Hu, Chi-Chang
Chang, Kuo-Hsin
In this work, the electrochemical behavior and the corresponding mass variation of amorphous manganese oxide (denoted as a-MnOx) are examined simultaneously in a neutral electrolyte containing 10 mM Na 2SO4 without or with NaHCO3 or Na 2HPO4 by cyclic voltammetry with a quartz crystal microbalance (QCM). a-MnOx was anodically deposited onto the gold-sputtered quartz electrode by means of a potentiostatic method at 1.0 V for 60 s. The morphology and microstructure of a-MnOx with different potential windows of CV cycling in the above electrolyte were examined by means of the scanning electron microscopy (SEM). From this EQCM study, a-MnO x is unstable between 1.0 and 1.2 V in 10 mM Na2SO 4 because of significant dissolution of a-MnOx. The repeated potential cycling promotes the electrocatalytic activity of a-MnO x for oxygen evolution, which also enhances the dissolution of a-MnOx. The dissolution phenomenon and oxygen evolution are successfully suppressed by the formation of insoluble manganese carbonate or the adsorption of phosphate by adding NaHCO3 or Na2HPO 4 in the Na2SO4 electrolyte, enlarging the potential window for the charge/discharge of a-MnOx.
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