In Situ Modified Nitrogen-Enriched ZIF-67 Incorporated ZIF-7 Nanofiber: An Unusual Electrocatalyst for Water Oxidation.

One-dimensional (1D) based carbonaceous materials have wider applicability owing to flexibility over their properties. Electrospinning is one of the pioneering techniques that is being utilized predominantly for the synthesis of fibers. Fibrous material has their own advantages like, high porosity over its surface, mechanical stability and fascinating physicochemical properties. With these many advantages, herein we have synthesized a distinctive nanofiber from a zeolite imidazolate framework (ZIF) based material. This powder has been mixed with PAN (polyacrylonitrile) which act as both a heteroatom source and a precursor material in the making of a fibrous material via electrospinning. The synthesized nitrogen-enriched ZIF-67 incorporated ZIF-7 microfibers were prepared under two different conditions (room temperature and N2 atmosphere) and labeled as CoZn-ZIF-RT and CoZn-ZIF-500, respectively. The newly developed materials were assessed for the first time in electrocatalytic oxygen evolution reaction (OER) studies have been carried out in a 1 M KOH electrolyte. CoZn-ZIF-500 delivered superior activity at a current density of 10 mA cm-2 with a kinetically facile Tafel slope and explicitly showed good long-term stability.