A dendritic palladium electrode for a hydrogen peroxide sensor fabricated by electrodeposition on a dynamic hydrogen-bubble template and dealloying

A dendritic Pd-Cu electrode has been prepared by co-electrodeposition of palladium and copper with high cathodic over-potentials, in which hydrogen evolution occurred. The dendritic Pd-Cu was electrochemically de-alloyed to selectively remove copper. This de-alloyed Pd-(Cu) electrode has a dramatically increased surface-area that is appropriate for electrochemical sensor applications. Electrode characteristics for use as a non-enzymatic sensor were monitored by cyclic voltammetry and amperometry, in which detection signals for hydrogen peroxide (H₂O₂) were precisely measured. The prepared dendritic Pd-(Cu) electrode demonstrated outstanding electrocatalytic activity for H₂O₂ reduction with a detection limit of 1.78 × 10^-8 M, a wide dynamic range of 50 μM to 10 mM, and high sensitivity of 915.25 μA cm^-2 mM^-1.