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One way to address the cost issue of polymer electrolyte membrane fuel cells (PEMFCs) is to reduce the amount of platinum used in the cathode catalyst layers (CLs). The oxygen mass transfer resistance of the cathode CLs is the main bottleneck limiting the polarization performance of low Pt-loading membrane electrodes at high current densities. Pt n...
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Molecular catalysts dispersed on nanocarbon substrates represent a unique class of single atom catalysts (SACs) for their well-defined active sites and tailorable structures, and are promising substitutes to precious metals for catalyzing the technologically important oxygen reduction reaction (ORR). Herein, we develop a highly active ORR catalyst...
Citations
Microbial fuel cells (MFC) are technologies that use microorganisms that transfer electrons to the anode, which flows to the cathode to find a final electron acceptor. Oxygen (O2) is the most widely used electron acceptor as it can diffuse through air–cathodes in single–chamber MFCs. However, microorganisms need neutral to slightly acid pH to survive, which is detrimental to the oxygen reduction reaction (ORR). Therefore, catalysts are needed at the air–cathodes to sustain a stable operation of single–chamber MFCs. Here, we report that the use of small amount (0.15 mg cm⁻²) of a Fe–N–C catalyst with carbon black in air–cathodes promote the ORR in neutral media and can sustain a stable MFC operation, keeping cell voltages of 0.3 V for 8 days.
