Influence of sodium dodecylbenzene sulfonate on hydrogen peroxide synthesis from fuel cell

Three kinds of oxygen electrodes were prepared by modifying carbon black materials with different mass concentrations of sodium dodecylbenzene sulfonate (SDBS) as surfactant. The electrocatalytic activity of the electrodes was investigated by using polarization curve test. The results show that oxygen reduction is increased when SDBS is added with suitable mass concentration. The influence on hydrogen peroxide synthesis can be further studied by putting them in the fuel cell reactor. The results indicate the output of hydrogen peroxide is reduced by adding excessive mass concentration of SDBS. The maximum current and higher output of hydrogen peroxide are produced, the concentration of hydrogen peroxide approaches 226 mmol/L when SDBS is added with suitable mass concentration. And every current efficiency of three electrodes is 100%. The analysis of impedance spectra shows that adding suitable mass concentration of SDBS to the system can decrease the charge transfer resistance and chemical reaction resistance, but the catalytic mechanism is not changed.