title: Interlocked graphene-Prussian blue hybrid composites enable multifunctional electrochemical applications.
abstract: There has been increasing interest recently in mixed-valence inorganic nanostructure functionalized graphene composites, represented by Prussian blue, because they can cost-effectively apply to biosensors and energy devices. In this work, we present a one-pot green method to synthesize interlocked graphene-Prussian Blue hybrid composites as high-performance materials for biosensors and supercapacitor electrodes. Given the fact that graphene oxide (GO) can act as an electron acceptor, we used iron(II) and glucose as co-reducing agents to reduce GO under mild reaction conditions without introducing toxic agents. High quality Prussian blue nanocubes with no or little coordinated water were generated simultaneously. Reduced graphene oxide (rGO) was thus functionalized by Prussian blue nanocubes via chemical bonding to form a kind of interlocked microstructure with high stability and good conductivity. The as-synthesized composites were tested for biosensing of hydrogen peroxide (H2O2) and as supercapacitor electrode materials. The specific capacitance of the microcomposite based electrodes can reach 428Fg-1, with good cycling stability. The microcomposite also displays high performance catalysis towards electroreduction of H2O2with a high sensitivity of 1.5Acm-2M-1.
authors.affiliation: Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Minwei
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Chengyi
authors.initials: C
authors.lastname: Hou
authors.affiliation: Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Arnab
authors.initials: A
authors.lastname: Halder
authors.affiliation: Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors.forename: Jens
authors.initials: J
authors.lastname: Ulstrup
authors.affiliation: Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark. Electronic address: cq@kemi.dtu.dk.
authors.forename: Qijin
authors.initials: Q
authors.lastname: Chi
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation; D025802:Electric Capacitance; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D005295:Ferrocyanides / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D055772:Green Chemistry Technology; D006861:Hydrogen Peroxide / Q000032:analysis*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry
chemical_list: D005295:Ferrocyanides; D010087:Oxides; D006108:Graphite; D006861:Hydrogen Peroxide; C000170:ferric ferrocyanide
keywords: Biosensor; Graphene; One-pot synthesis; Prussian blue; Supercapacitor