Fig. 5 | Nature Communications

Fig. 5

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

Fig. 5

Enhancement of the power output of a metallic cotton fiber-based biofuel cell. a Complete metallic cotton fiber-based biofuel cells (MCF-BFCs) with a constant anode (30-bilayered glucose oxidase (GOx)/tris-(2-aminoethyl)amine (TREN)) multilayer-coated MCF (i.e. 30-GOx/20-MCF) and cathodes with a controlled number of bilayers n (n-bilayered metallic cotton fiber, n-MCF). b Cathodic current curves for n-MCF cathodes as a function of n. c Nyquist plots of the MCF cathodes depending on n. In this case, the equivalent series resistance (ESR) values for n= 20, 50, 70, 90, and 120 were approximately 24, 22, 17, 16, and 13 Ω, respectively. d Power output of the MCF-BFCs (an n-MCF cathode and a 30-bilayered GOx/TREN multilayer-coated 20-bilayered MCF anode) with external resistors (1 kΩ~10 MΩ) as a function of n-MCF. e Power outputs of one and two MCF-BFCs composed of the 120-MCF cathode and the 30-GOx/20-MCF anode. In these cases, the two MCF-BFCs were connected with each other in series, and its power output was also measured with current output through operating a cell potential by an external resistor. The error bars (d, e) show the standard deviation from the mean value of power densities for 3−5 independent experiments

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