FeNi Nanoparticles Embedded in Porous Nitrogen-Doped\nGraphene for Electrocatalytic Evolution of Hydrogen and Oxygen

Abstract

The\nthermal annealing method is regarded as a general and promising\nmethod for preparation of carbon-based electrocatalysts. However,\nthis method always suffers from complex and harsh preparative conditions,\nsuch as high pyrolysis temperature, protective gas environment, and\nlong synthesis period. Herein, a laser engraving method is introduced\nfor preparation of porous nitrogen-doped graphene layer-enclosed FeNi\nnanoparticles (FeNi/PNGs), starting with metal organic frameworks\n(MOFs) as precursors. All the steps were quickly achieved at room\ntemperature and in air environment. Another attractive feature of\nthis method is that FeNi/PNG supported on polyamide (PI) film could\ndirectly act as electrocatalytic electrode for hydrogen (HER) and\noxygen evolution reaction (OER) without the involvement of dispersion\nand drop-casting of electrocatalyst ink. The FeNi/PNG shows overpotentials\nof 132 and 353 mV with Tafel slope of 94 and 80 mV dec^–1 for HER and OER catalyses, respectively. This simple and convenient\nmethod could be extended to other catalytic systems with carbon-based\nmaterials as electrocatalysts.