Recent Progress on NiFe‐Based Electrocatalysts for the Oxygen Evolution Reaction

Abstract

are required. [2a,b,3] Among the various sustainable energy candidates, hydrogen fuel has garnered significant attention owing to its natural advantages. Hydrogen is typically a nontoxic and environmentally friendly power source that can be produced from water, which is an earth-abundant reactant, and produces no CO 2 emissions when converted into other energy forms. [4-6] In addition, due to its high mass-specific energy density, hydrogen can be efficiently used in mobile applications. Moreover, hydrogen can be used in combustion engines and fuel cells. Hence, the development of efficient hydrogen-based energy systems is necessary. [7-9] Producing hydrogen by electrolytic water splitting is considered a promising approach to resolve the current environmental crisis and has been extensively investigated with emphasis on availability and sustainability. [10,11] During water electrolysis, the cathodic hydrogen evolution reaction (HER) [12] and the anodic oxygen evolution reaction (OER) occur simultaneously, as exemplified by the following equations

Engineering Ultrafine NiFe‐LDH into Self‐Supporting Nanosheets: Separation‐and‐Reunion Strategy to Expose Additional Edge Sites for Oxygen Evolution

“…These technologies can provide a zero-carbon solution to convert intermittent renewable energy, including solar and wind power, into chemical energy stored in fuels or chemicals, thereby reducing our dependence on fossil fuels. Unfortunately, OER remains a major bottleneck for practical application due to its sluggish kinetics involving four-electron transfer, [1] although various electrocatalysts, including some noble metal oxides (RuO 2 and IrO 2 ), [2] layered double (oxy) hydroxides, [3] and perovskites, [4] have been developed to facilitate the electron transfer. Compared with other catalysts, Ni-Fe layered double hydroxide (NiFe-LDH) has a competitive advantage because of the high availability on the earth and the high activity in alkaline electrolytes, [5] but the deficiency in rational design for exposing more active sites greatly hinders the further improvement of its OER performance.…”

Amorphous heterogeneous NiFe-LDH@Co(OH)2 supported on nickel foam as efficient OER electrocatalysts

“…On the other hand, it has been reported that the interlaminar basal plane of bulk NiFe-LDH is conducive to OER activity. However, the slow diffusion of proton receptors (such as OH − ) in the interlaminar NiFe-LDH during the OER process leads to the dissolution of NiFe-LDH, thus reducing OER activity over time [26,29]. Therefore, exposing more active specific surface areas and improving the stability of NiFe-LDH are effective methods to further enhance their catalytic activity.…”

Controllable Synthesis of Graphene-Encapsulated NiFe Nanofiber for Oxygen Evolution Reaction Application

“…Oxygen evolution reaction (OER) is one of the most basic and important electrochemical reactions for the production of renewable energy, which can be used in many green energy systems such as water splitting, fuel cells and metal-air batteries [1,2]. The multi-electron transfer reaction mechanism makes it challenging to develop such highly efficient catalysts [3,4]. Noble metals oxides (RuO 2 /IrO 2 ) have been used as OER catalysts in practical applications [5,6].…”