1 research outputs found
High-Performance Photoelectrochemical Enzymatic Bioanalysis Based on a 3D Porous Cu<sub><i>x</i></sub>O@TiO<sub>2</sub> Film with a Solid–Liquid–Air Triphase Interface
The accurate detection of H2O2 is
crucial
in oxidase-based cathodic photoelectrochemical enzymatic bioanalysis
but will be easily compromised in the conventional photoelectrode–electrolyte
diphase system due to the fluctuation of oxygen levels and the similar
reduction potential between oxygen and H2O2.
Herein, a solid–liquid–air triphase bio-photocathode
based on a superhydrophobic three-dimensional (3D) porous micro–nano-hierarchical
structured CuxO@TiO2 film that
was constructed by controlling the wettability of the electrode surface
is reported. The triphase photoelectrochemical system ensures an oxygen-rich
interface microenvironment with constant and sufficiently high oxygen
concentration. Moreover, the 3D porous micro–nano-hierarchical
structures possess abundant active catalytic sites and a multidimensional
electron transport pathway. The synergistic effect of the improved
oxygen supply and the photoelectrode architecture greatly stabilizes
and enhances the kinetics of the enzymatic reaction and H2O2 cathodic reaction, resulting in a 60-fold broader linear
detection range and a higher accuracy compared with the conventional
solid–liquid diphase system