To simplify the miniature fuel cell structure and flow mode, we report here a microfluidic fuel cell running on H 2 O 2 as both fuel and oxidant under acidic conditions. Prussian blue coating on carbon paper serves as the cathode side while the anode is made of three-dimensional flow-through Ni foam. The fuel cell achieves a power density in excess of 0.58 ± 0.13 W m −2 at a current density of 3.68 ± 0.1 A m −2 , and an open circuit potential of 0.65 V. Importantly, the Ni foam shows a corrosion in H 2 O 2 -catalyzing after a long-term operation, which is seriously neglected by most of previous H 2 O 2 -running fuel cells. SEM images and XPS spectra demonstrate a gradient corrosion occurs in the three-dimensional flow-through porous Ni-foam electrode. The corrosion degree of Ni foam gradually aggravates along the vertical direction, which is caused by the gradient accumulation of H 2 O in the porous electrode. The protection methods including surface coating a protection layer and doping some more reactive metals have been proposed to improve the system commercialization.
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