Direct Use of 3d-Transition Metal Organic Framework as Catalyst for Oxygen Evolving Reaction (OER) and Hydrogen Evolving Reaction (HER)

Abstract

High-purity hydrogen can be produced using an effective process known as electrochemical water splitting to provide environmentally acceptable fuels. The advancement of affordable, earth-rich catalysts is the fundamental obstacle to electrochemical water splitting’s wide-scale industrial applications. Oxygen evolving reactions (OERs) and hydrogen evolving reactions (HERs) are two of the processes involved in electrochemical water splitting. Widespread interest has been shown in creating efficient first-row transition metal electrocatalysts that can take the role of platinum-based electrocatalysts for both oxygen and hydrogen evolving reactions. A family of crystalline porous materials made from organic ligands and metal ions are known as metal organic frameworks (MOFs). A promising family of novel materials called MOFs has been developed for high-efficiency OER and HER electrocatalysts. Direct MOF catalysts and MOF-derived catalysts are the two divisions of MOF-based catalysts. The following are examples of MOF-derived catalysts: (i) guest@ MOF composites; (ii) hybrid materials produced by pyrolyzing MOFs; and (iii) hybrid materials created from MOFs. The best direct catalysts for OER and HER are reportedly nickel/cobalt monometallic MOF and iron-nickel/iron-cobalt heterometallic MOF. According to one theory, the breakdown of organic ligands and the formation of molecules based on water-oxidizing oxides may be a result of first-row transition MOFs being exposed to the hostile HER and OER conditions. The most recent advancements in first-row transition MOFs as direct catalysts of OER and HER are outlined in this article.