Premium
Electrochemical Biosensor Based on Nanoporous Au/CoO Core–Shell Material with Synergistic Catalysis
Author(s) -
Zhang Chao,
Huang Bin,
Qian Lihua,
Yuan Songliu,
Wang Shuai,
Chen Rong
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500854
Subject(s) - nanoporous , biosensor , electrochemistry , catalysis , nanotechnology , chemistry , chemical engineering , electrocatalyst , core (optical fiber) , bioelectrochemistry , materials science , electrode , organic chemistry , composite material , engineering
An ultrathin CoO layer is deposited on the skeleton surfaces of a nanoporous gold (NPG) film by using atomic layer deposition, creating a flexible electrode. Detailed characterization demonstrates the superior performance of the flexible NPG/CoO hybrids for electrochemical catalysis. The NPG/CoO hybrid not only achieves high catalytic activity for glucose oxidation and H 2 O 2 reduction, but also exhibits a linear dependence of the electrical signal on the concentration of glucose and H 2 O 2 molecules in the electrolyte. Meanwhile, the sensitivity for H 2 O 2 reduction can be as high as 62.5 μA m m −1 cm −2 with linear dependence on the concentration in the range of 0.1–92.9 m m . The high sensitivity is proposed to result from the synergistic effect of Au and CoO at the interfaces, and the high conductivity of the gold skeleton with a large surface area. The superior electrochemical performance of this hybrid electrode is promising for future potential applications in various transitional‐metal‐oxide‐based electrochemical electrodes.