Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 15, Pages 12808-12814Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am502791h
Keywords
three-dimensional graphene networks; glucose/O-2 biofuel cell; laccase; dopamine; oxygen reduction
Funding
- NSFC [21305041, 21175042, 20975038, 21275052]
- Scientific Research Fund of Hunan Provincial Education Department [13B063]
- Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Start-Up Fund for Young Teachers in Hunan Normal University
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We report here three-dimensional graphene networks (3D-GNs) as a novel substrate for the immobilization of laccase (Lac) and dopamine (DA) and its application in glucose/O-2 biofuel cell. 3D-GNs were synthesized with an Ni2+-exchange/KOH activation combination method using a 732-type sulfonic acid ion-exchange resin as the carbon precursor. The 3D-GNs exhibited an interconnected network structure and a high specific surface area. DA was noncovalently functionalized on the surface of 3D-GNs with 3,4,9,10-perylene tetracarboxylic acid (PTCA) as a bridge and used as a novel immobilized mediating system for Lac-based bioelectrocatalytic of oxygen. The 3D-GNs-PTCA-DA nanocomposite modified glassy carbon electrode (GCE) showed stable and well-defined redox current peaks for the catechol/o-quinone redox couple. Due to the mediated electron transfer by the 3D-GNs-PTCA-DA nanocomposite, the Nafion/Lac/3D-GNs-PTCA-DA/GCE exhibited high catalytic activity for oxygen reduction. The 3D-GNs are proven to be a better substrate for Lac and its mediator immobilization than 2D graphene nanosheets (2D-GNs) due to the interconnected network structure and high specific surface area of 3D-GNs. A glucose/O-2 fuel cell using Nafion/Lac/3D-GNs-PTCA-DA/GCE as the cathode and Nafion/glucose oxidase/ferrocence/3D-GNs/GCE as the anode can output a maximum power density of 112 mu W cm(-2) and a short-circuit current density of 0.96 mA cm(-2). This work may be helpful for exploiting the popular 3D-GNs as an efficient electrode material for many other biotechnology applications.
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