Porous Cu_xO/Ag_2O (x = 1, 2) nanowires anodized on nanoporous Cu-Ag bimetal network as a self-supported flexible electrode for glucose sensing

摘要

At present, it is of great significance to develop novel free-standing electrode materials with high porosity and excellent glucose electrocatalytic performance for glucose detection. Herein, we synthesize two types of self-supported electrodes with CuxO or CuxO/Ag2O (x = 1, 2) nanowires grown on the nanoporous substrate via dealloying of Cu50-xZr50Agx (x = 0 and 7.5 at%) metallic glasses, followed by anodizing and calcination. The effects of adding Ag element into Cu-50 Zr-50 MG precursor on the morphology and electrochemical performance of electrodes are systematically investigated. Compared with cluster-like copper monometallic oxide nanowire on nanoporous Cu (CuxO@NPC, x = 1, 2) electrode, the in-situ grown copper-silver bimetallic oxide nanowire on nanoporous Cu-Ag (CuxO/Ag2O@NP-CuAg) electrode with tip convergence and hierarchical porous structure possesses better electrooxidation performance for glucose. The newly developed CuxO/Ag2O@NP-CuAg electrode exhibits a high sensitivity of 1.31 mA mM(-1) cm(-2) and wide linear range up to 15 mM, outstanding anti-interference ability and stability. The enhanced electrocatalytic performance is mainly due to the synergistic effect of Cu and Ag elements as well as unique structural characteristics. Meanwhile, the possible glucose electrocatalytic mechanism of CuxO/Ag2O@NP-CuAg electrode is proposed. The as-developed materials with good glucose sensing performance and flexibility will be highly promising in wearable glucose sensors.