Au Promoted Nickel–Iron Layered Double Hydroxide Nanoarrays: A Modular Catalyst Enabling High-Performance Oxygen Evolution

Abstract

Oxygen evolution reaction (OER) plays a key role in various energy conversion and storage technologies, such as water electrolysis, regenerative fuel cells, and rechargeable metal-air batteries. However, the slow kinetics of OER limit the performance and commercialization of such devices. Herein, we report on NiFe LDH@Au hybrid nanoarrays on Ni foam for much enhanced OER. By hybridization of electronegative Au and NiFe LDH with intrinsic remarkable OER catalytic activity, this modular electrode could drive an overall ultrahigh-performance and robust OER in base with the demand of overpotentials of only 221, 235, and 270 mV to afford 50, 100, and 500 mA cm, respectively. Also, it exhibits superior catalytic activity and durability toward OER in 30 wt % KOH.

A review of transition metal‐based bifunctional oxygen electrocatalysts

“…Au nanostructure‐decorated catalysts have been proposed to be able to enhance electrocatalytic activities through the formation of favorable local catalyst‐gold interfacial interactions due to Au being the most active for ORR in alkaline media, despite poor performances in acidic media . For example, Wang and coworkers studied the influence of embedding NiFe‐LDH electrocatalysts with polyatomic Au and reported that the polyatomic Au distribution on the surface of NiFe‐LDH can exhibit higher activities with a current density of ~500 mA/cm and higher stability than pristine samples. Zhang et al synthesized single atom Au‐decorated NiFe‐LDHs as efficient OER catalysts and found that by downsizing the particles from the nanometer scale to single atoms, Au usage can be effectively reduced and atomic utilization can be maximized.…”

NiFeCo oxide as an efficient and sustainable catalyst for the oxygen evolution reaction

“…Mixed metal alloys and layered double hydroxides (LDHs) have recently demonstrated outstanding electrochemical properties for the OER and HER . Other methodologies have also been employed to enhance the electrocatalytic performance of electrode materials, such as morphological engineering, hybrid composite synthesis, and doping . Binary oxides and there complex systems have been developed with metals that are abundant in the earth's crust for effective water catalytic activity.…”

Electrochemical Cathodic Treatment of Mild Steel as a Host for Ni(OH)2 Catalyst for Oxygen Evolution Reaction in Alkaline Media

“…In practice, overall process require excessive overpotential (η; 400–500 mV) from the theoretical potential of 1.23 V in association with kinetics of OER and HER, electrode, electrolyte and ohmic resistance . The kinetics of η was minimised and efficiency of water splitting process was increased by appropriate electrocatalysts on anode (IrO 2 and RuO 2 ) and cathode (Pt/C) in acidic medium . Higher cost and low availability of these noble metal based catalysts minimize the widespread commercialization of electrochemical water splitting process.…”

“…[2,3] It offers storage of renewable energy in the grid scale as well as high pure chemical fuel of H 2 and O 2 for fuel cell and other industrial needs. [4][5][6] In the electrochemical water splitting process, 4e À transfer anodic oxygen evolution reaction (OER; 4OH À !2H 2 O + O 2 + 4e À ) is energy intensive and plays a critical role than compared to 2e À transfer hydrogen evolution reaction (HER; 2H 2 O + 2e À !H 2 ). In practice, overall process require excessive overpotential (η; 400-500 mV) from the theoretical potential of 1.23 V in association with kinetics of OER and HER, electrode, electrolyte and ohmic resistance.…”

“…[7,8] The kinetics of η was minimised and efficiency of water splitting process was increased by appropriate electrocatalysts on anode (IrO 2 and RuO 2 ) and cathode (Pt/C) in acidic medium. [4,9] Higher cost and low availability of these noble metal based catalysts minimize the widespread commercialization of electrochemical water splitting process. Replacement of noble metal based catalysts by earth abundant transition metal based catalysts offer widespread commercialization of electrochemical water splitting process in alkaline medium.…”