Fig. 4 | Nature Communications

Fig. 4

From: High-power hybrid biofuel cells using layer-by-layer assembled glucose oxidase-coated metallic cotton fibers

Fig. 4

Linker type-dependent biofuel cell anodes. a Field-emission scanning electron microscopy (FE-SEM) images and illustrated top views of (glucose oxidase (GOx)/poly(ethylenimine) (PEI))30 and GOx/tris-(2-aminoethyl)amine (TREN)m multilayer-coated metallic cotton fibers (MCFs). The scale bars indicate 100 µm. Inset: Schematic diagram showing the difference of the insulating polymer linker (PEI) and small-molecule linker (TREN), which is related to the internal distance (right). In glucose oxidase, flavin adenine dinucleotide (FAD) acts as an electron acceptor. b Anodic current density curves of 30-GOx/20-MCF electrodes prepared from (GOx/PEI)30 and (GOx/TREN)30 in the absence and presence of glucose (300 mmol L−1). c Nyquist plots for the 30-bilayered GOx/TREN multilayer-coated MCF (i.e., 30-GOx/20-MCF) anodes prepared using PEI and TREN linkers. The equivalent series resistance (ESR) values of the PEI- and TREN-based 30-GOx/20-MCF anodes were 62 and 40 Ω, respectively, in phosphate-buffered saline (PBS) containing 300 mmol L−1 glucose

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