▎ 摘　　要

Porous bimetallic alloyed palladium silver (PdAg) nanoflowers supported on reduced graphene oxide (PdAg NFs/rGO) were prepared via a facile and simple in situ reduction process, with the assistance of cetyltrimethylammonium bromide as a structure directing agent. The as-prepared nanocomposite modified glassy carbon electrode (PdAg NFs/rGO/GCE) showed enhanced catalytic currents and enlarged peak potential separations for the oxidation of ascorbic acid (AA), dopamine (DA), and uric acid (UA) as compared to those of PdAg/GCE, rGO/GCE, commercial Pd/C/GCE, and bare GCE. The as-developed sensor can selectively detect AA, DA, and UA with a good anti-interference ability, wide concentration ranges of 1.0 mu M-2.1 mM, 0.4-96.0 mu M, and 1.0-150.0 mu M, respectively, together with low detection limits of 0.057, 0.048, and 0.081 mu M (S/N = 3), respectively. For simultaneous detection of AA, DA, and UA, the linear current-concentration responses were observed from 1.0 mu M-4.1 mM, 0.05-112.0 mu M, and 3.0-186.0 mu M, with the detection limits of 0.185, 0.017, and 0.654 mu M (S/N = 3), respectively.