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. 2012 Jun 12;7(6):e38436. doi: 10.1371/journal.pone.0038436

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Steady-state output power of the fuel cell exhibits characteristic second-order dependence on the magnitude of the resistive load. A 1 mm² device achieves maximum steady-state power output of 3.4 µW cm⁻² when driving a load of 550 kΩ. (Blue curve, lower horizontal axis, linear scale; red curve, upper horizontal axis, logarithmic scale.).