The Solid-Phase Synthesis of an Fe-N-C Electrocatalyst for High-Power Proton-Exchange Membrane Fuel Cells

摘要

The environmentally friendly synthesis of highly active Fe-N-C electrocatalysts for proton-exchange membrane fuel cells (PEMFCs) is desirable but remains challenging. A simple and scalable method is presented to fabricate Fe-II-doped ZIF-8, which can be further pyrolyzed into Fe-N-C with 3wt% of Fe exclusively in Fe-N-4 active moieties. Significantly, this Fe-N-C derived acidic PEMFC exhibits an unprecedented current density of 1.65 A cm(-2) at 0.6V and the highest power density of 1.14 W cm(-2) compared with previously reported NPMCs. The excellent PEMFC performance can be attributed to the densely and atomically dispersed Fe-N-4 active moieties on the small and uniform catalyst nanoparticles.