Nitrogen-doped 3D hierarchical ordered mesoporous carbon supported palladium electrocatalyst for the simultaneous detection of ascorbic acid, dopamine, and glucose

In the present work, nitrogen-doped three-dimensional (3D) hierarchical ordered mesoporous carbon supported palladium (Pd 20 wt%/N-3D) electrocatalyst was successfully synthesized with the nanocasting method. The as-prepared material was physicochemically and electrochemically characterized. It is found that the as-prepared electrocatalyst exhibits a hierarchically porous structure with interconnected walls, which permits the exposure of more active sites to the respective reactant. Due to its special structure, the electrocatalyst (i) is highly poison-tolerant to the intermediates of glucose electrooxidation reaction, (ii) presents high activity for ascorbic acid electrooxidation, and (iii) exhibits a moderate activity to dopamine electrooxidation reaction. The as-prepared electrocatalyst displayed a relatively good stability behavior. Its sensitivity range is reported to be 0.990 μA μM−1 cm−2, 0.38 μA μM−1 cm−2, and 0.09 μA μM−1 cm−2 for ascorbic acid, dopamine, and glucose, respectively.