Ag Nanoparticles-Modified 3D Graphene Foam for Binder-Free Electrodes of Electrochemical Sensors.
Ag nanoparticles-modified 3D graphene foam was synthesized through a one-step in-situ approach and then directly applied as the electrode of an electrochemical sensor. The composite foam electrode exhibited electrocatalytic activity towards Hg(II) oxidation with high limit of detection and sensitivity of 0.11 μM and 8.0 μA/μM, respectively. Moreover, the composite foam electrode for the sensor exhibited high cycling stability, long-term durability and reproducibility. These results were attributed to the unique porous structure of the composite foam electrode, which enabled the surface of Ag nanoparticles modified reduced graphene oxide (Ag NPs modified rGO) foam to become highly accessible to the metal ion and provided more void volume for the reaction with metal ion. This work not only proved that the composite foam has great potential application in heavy metal ions sensors, but also provided a facile method of gram scale synthesis 3D electrode materials based on rGO foam and other electrical active materials for various applications.
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. wuwg2010@163.com.
Tao
T
Han
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. jianjl2017@126.com.
Jianli
J
Jin
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. congxw2017@163.com.
Congxu
C
Wang
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. syyi@pku.edu.cn.
Youyi
Y
Sun
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. yhe_zh@163.com.|Nanotechnology Department, Helmholtz Association, Hamburg 21502, Germany. yhe_zh@163.com.
Yinghe
Y
Zhang
Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, China. lyqzgz2010@163.com.
Yaqing
Y
Liu
in‐situ approach;  Ag nanoparticles;  electrochemical detection;  heavy metal  ion;  rGO foam