posted on 2023-11-10, 05:03authored byXiumin Yang, Sijia Lv, Liyong Gan, Chun Wang, Zhi Wang, Zhonghai Zhang
A single-atom
catalyst (Fe SAs/–N-C) with excellent stability
and conductivity was strategically fabricated via high-temperature
calcination using the NiFe layered double hydroxide (LDH)/ZIF-8 composite
as precursors. With the help of Ni as a catalyst, a great number of
carbon nanotubes were produced whereby the isolated carbon bulks were
interconnected to form an “island-bridge”-like 3D network
structure, which greatly enhanced the exposure of active sites and
the electron transfer. Accordingly, caffeic acid (CA) with versatile
biological and pharmacological activities was chosen as the model
analyte. The Fe SAs/–N-C with Fe–N4 as the
catalytic active site was employed to establish the electrochemical
sensing of CA with satisfactory sensitivity, selectivity, and long-term
stability. This work expands the application range of single-atom
catalysts and contributes a significant reference for the synthesis
of hybrid double-atom catalysts.