Binary metal oxides with carbon nanocomposites have received
extensive
attention as research hotspots in the electrochemistry field owing
to their tunable properties and superior stability. This work illustrates
the development of a facile sonochemical strategy for the synthesis
of a copper bismuthate/graphene (GR) nanocomposite-modified screen-printed
carbon electrode (CBO/GR/SPCE) for the electrochemical detection of
catechol (CT). The formation of an as-prepared CBO/GR nanocomposite
was comprehensively characterized. The electrochemical behavior of
the CBO/GR/SPCE toward CT was investigated by voltammetry and amperometry
techniques. The fabricated CBO/GR/SPCE manifests an excellent electrocatalytic
performance toward CT with a lower peak potential and a higher current
value compared to those of CBO/SPCE, GR/SPCE, and bare SPCE. It is
attributed to enhanced electro-catalytic activity, synergetic effects,
and good active sites of the CBO/GR nanocomposite. Under the electrochemical
condition, the CBO/GR/SPCE displayed a wide linear sensing range,
trace-level detection limit, acceptable sensitivity, and excellent
selectivity. Furthermore, our proposed CBO/GR electrode was employed
successfully for CT detection in water samples.