▎ 摘　　要

Three-dimensional graphene foams (3D-GFs), composed of two hierarchical pore morphologies, were prepared by a facile soft foam templating strategy, and served as building blocks to construct a metal-free multi -compo-nent electrochemical sensing platform for sensitive discrimination of dopamine (DA) and uric acid (UA) in the coexistence of high concentration of ascorbic acid (AA). In virtue of the effective foam template and directional freezing, the formed quasi-spherical macropores and irregular minor pores between adjacent macropores in 3D-GFs could provide multiple electron transfer pathways and more exposed electroactive sites for the evident distinction of three analytes. When 500 uNI AA coexisted in the ternary mixture, well-resolved current responses and desirable linear relationships of DA and UA were obtained after the synchronous change of their levels, and the corresponding concentration ranges and detection limits were determined to be 1-80 uNI and 0.21 uNI for DA and 5-500 uNI and 1.27 uNI for UA, respectively. The 3D-GFs-based metal-free electrochemical sensor was further applied to monitor DA and UA in medical dopamine injections and human urine specimens with satisfactory results, which demonstrates that 3D-GFs is expected to become a promising electrode material candidate in multi-component sensitive discriminations.