The role of Fe-Nx/N/V3C2 nanoelectrocatalyst based on organometallic framework in oxygen reduction activity

Abstract

In the contemporary era, it is imperative to advance the creation of supremely efficient electrocatalysts  for the oxygen reduction reaction (ORR) that utilize readily available, frequent, and economically viable elements. Organometallic frameworks (MOFs), which have the ability to adjust the pore size, have been considered in various research fields, including catalysts. Significantly, a considerable array of materials derived from or founded on MOFs have been utilized for ORR as a result of their expansive surface area, adjustable components, and manageable pore size. In this research, the novel material Fe-Nx/N/V3C2 was prepared using a straightforward synthesis method. V3C2, when utilized as a conductive substrate, has the capability to hinder the degradation and buildup of the Fe-N-C structure during the pyrolysis process, thereby providing stabilization to the electrocatalyst. The cooperative interactions between Fe-Nx and the V3C2 substrate enhance the electron-ion transfer mechanism within the nanocomposite,  ultimately establishing a four-electron pathway. Finally, due to the uniform dispersion of Fe-Nx on the V3C2 porous substrate, the electrode produced from the nanocomposite showed good ORR catalytic activity with limiting current density (JD), half-wave potential (E1/2) and n values of 4.5 mA cm−2, 0.896 V and 3.98, respectively.