Data for journal article: Stability of electrodeposited manganese oxide films under electrochemical carbon dioxide reduction conditions
<p dir="ltr">This is the data from the paper: Stability of electrodeposited manganese oxide films under electrochemical carbon dioxide reduction conditions. </p><p dir="ltr">Paper abstract: Electrodeposition of manganese oxide onto a boron-doped diamond electrode substrate was carried out, to explore the application of the films as an electrocatalyst for CO<sub>2</sub> reduction. The films were characterized as δ-MnO<sub>2</sub> using Raman spectroscopy and x-ray photoelectron spectroscopy. The films were found to remain intact but to undergo partial reduction to Mn<sub>3</sub>O<sub>4</sub> at -1.0 V in N<sub>2</sub>-saturated 0.1 M KHCO<sub>3</sub> electrolyte. However, when the solution was saturated with CO<sub>2</sub> the δ-MnO<sub>2</sub> film underwent significant dissolution, indicating the formation of solution Mn(II) products. This result was attributed to the more acidic pH of the CO<sub>2</sub> saturated solution. Given that such Mn oxide materials have been reported as successful CO<sub>2</sub> reduction electrocatalysts under identical conditions, this result was unexpected, but could be explained by a decreased kinetic stability of the electrodeposited film compared to Mn oxide materials prepared by other methods. Some mitigation approaches to improve the stability of the electrodeposited films are therefore proposed.</p>
