Abstract
We have searched for chemicurrent generation in Pt/GaN nanodiodes during catalytic CO oxidation and observe a reaction-induced current that scales with reaction rate. But after considering (1) how the reaction-induced current depends on diode shunt resistance, (2) calculations of the Pt surface temperature rise during reaction, (3) direct experimental measurements of the Pt surface temperature rise during reaction, and (4) direct experimental measurements of the lateral temperature gradient during reaction, and thus the consequent thermoelectric current it produces, we conclude that the reaction-induced current is generated entirely from a thermoelectric voltage and is not true chemicurrent.
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