InN/InGaN quantum
dots (QDs) are introduced as an efficient photoanode
for a novel abiotic one-compartment photofuel cell (PFC) with a Pt
cathode and glucose as a biofuel. Due to the high catalytic activity
and selectivity of the InN/InGaN QDs toward oxidation reactions, the
PFC operates without a membrane under physiologically mild conditions
at medium to low glucose concentrations with a noble-metal-free photoanode.
A relatively high short-circuit photocurrent density of 0.56 mA/cm
2
and a peak output power density of 0.22 mW/cm
2
are achieved under 1 sun illumination for a 0.1 M glucose concentration
with optimized InN/InGaN QDs of the right size. The super-linear dependence
of the short-circuit photocurrent density and the output power density
as a function of the logarithmic glucose concentration makes the PFC
well suited for sensing, covering the 4–6 mM range of glucose
concentration in blood under normal conditions with good selectivity.
No degradation of the PFC operation over time is observed.
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