Novel porous gold-palladium nanoalloy network-supported graphene as an advanced catalyst for non-enzymatic hydrogen peroxide sensing

Abstract

In an effort to develop electrocatalysts associated with effective design, testing, and fabrication, novel porous gold-palladium nanoalloy network-supported graphene (AuPd@GR) nanohybrids were successfully synthesized via electroless deposition followed by a chemical vapor deposition (CVD) method for the first time. The AuPd@GR nanohybrids were obtained as a continuous, porous, transparent, bendable, and ultrathin film with good assembly of the AuPd nanoalloy particles (<10nm) within the GR. The AuPd@GR nanohybrids exhibited excellent catalytic activity towards H2O2 detection with a wide detection range (5μM-11.5mM), high sensitivity (186.86μAmM(-1)cm(-2)), low limit of detection (1μM), fast response (3s), and long-term working stability (2500s). Furthermore, the AuPd@GR nanohybrids demonstrated outstanding durability, along with negligible interference from ascorbic acid, dopamine, uric acid, urea, potassium ions, chloride ions, and glucose. These findings open a new pathway to fabricate electrocatalysts for application in high performance electrochemical sensors and bioelectronics.

Keywords: Chemical vapor deposition; Electrocatalyst; Gold-palladium nanoalloy; Graphene; Hydrogen peroxide sensors; Nanoporous network.