Reversible Redox Transition and Pseudocapacitance of Molybdenum/Surface Molybdenum Oxides

다국어 초록 (Multilingual Abstract)

<P>Redox transitions and superior pseudocapacitance are two typical characteristics in the electrochemical behavior of metallic Mo (with surface Mo oxides) and bulk Mo oxides; both of which were attributed to the participation of H<SUP>+</SUP>/cations. The effects of different electrolyte anions (Cl<SUP>−</SUP>, SO<SUB>4</SUB><SUP>2−</SUP> and ClO<SUB>4</SUB><SUP>−</SUP>) on redox transition and pseudocapacitance of thin-film ‘Mo/Mo oxides’ electrodes were assessed in this work through DC and AC electrochemical experiments. Voltammetric peak potentials and currents and potential-dependent pseudocapacitance were strongly dependent on the electrolyte's anion. The variations were tested at different electrolyte pH levels and using different electrolyte cations (Li<SUP>+</SUP>, Na<SUP>+</SUP> and K<SUP>+</SUP>). The results were correlated with those obtained using a Se<SUP>4+</SUP> based electrolyte. The findings reported here are expected to aid the applicability of Mo and its oxides in electrocatalysis, electrodeposition, supercapacitor, display, corrosion control and solar cells.</P>