Ag Nanoparticles‐Modified 3D Graphene Foam for Binder‐Free Electrodes of Electrochemical Sensors

Abstract

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.

Free-standing Three Dimensional Graphene Incorporated with Gold Nanoparticles as Novel Binder-free Electrochemical Sensor for Enhanced Glucose Detection

“…In this regard, the content of Au in hybrid was found to be around 9.7 wt%, 19.8 wt%, and 30.1 wt% for 3D-GF@Au-3, 3D-GF@Au-5, and 3D-GF@Au-7, respectively. The formation of continuous 3D GR network with good dispersion of Au NPs can provide an effective pathway for charge transfer, more channels and active surface area to accelerate the interfacial reaction [24]. In addition, the penetration of Au NPs into GR struc-Scheme 1.…”

Graphene nanocrystals in CO2photoreduction with H2O for fuel production

“…This process initiates the electron-hole pair charge separation between the metal oxide and graphene. 43,96,101,112,148 Graphene is a potential electron acceptor and possesses a two-dimensional p-conjugation structure, which effectively suppresses the recombination of photogenerated e Àh + pairs. 49 Jiang et al synthesized a novel ternary SnO 2 /Cu/graphene composite by a one-pot selective reduction method, in which N 2 H 4 $H 2 O was used as a reductant to realize a selective reduction fabrication process because its reduction strength falls in between these two components.…”

“…Han and co-workers modied a graphene foam electrode with Ag 2+ NPs for detecting Hg using cyclic voltammetry (CV), and the limitation and sensitivity were 0.11 mM and 8.0 mA mM À1 , respectively. 43 In addition, the composites containing graphene and Ag NPs can be explored for use as glucose and quercetin sensors. 44,45…”

Flower-like Bismuth Metal-Organic Frameworks Grown on Carbon Paper as a Free-Standing Electrode for Efficient Electrochemical Sensing of Cd2+ and Pb2+ in Water

“…35 In addition, there may be also new penalties arising from supplementary interfaces between the current collector and active material, as well as active materials themselves. 36,37 These high contact resistance and insufficient interactions will greatly decrease sensitivity. In this context, it is of great significance to develop freestanding electrodes consisting of electroactive materials being directly grown on three-dimensional (3D) conductive and robust substrates.…”