Abstract
Active and stable electrocatalysts are the key to water electrolysis for hydrogen production. This paper reports a facile direct growth method to synthesize NiFe-layered double hydroxides (LDHs) on nickel foil as an electrocatalyst for the oxygen evolution reaction. The NiFe-LDH is synthesized by a galvanic process at room temperature without any additional energy for synthesis. The synthesized NiFe-LDH is a karst landform with abundant active sites and efficient mass diffusion. The NiFe-LDH with an oxygen defect show excellent electrocatalytic performance for the OER, with a low overpotential (272 mV at 10 mA/cm2), a small Tafel slope (43 mV/dec), and superior durability. Direct growth synthesis provide excellent electrical conductivity as well as strong bonding between the catalyst layer and the substrate. In addition, this synthesis process is simple to apply in the fabrication of a large size electrode and is believed to be applicable to commercialized alkaline water electrolysis.
Highlights
Electrocatalytic water splitting (H2O → 1/2 O2 + H2) for hydrogen generation is considered a clean and efficient hydrogen production approach
The HER is a fundamental reaction for hydrogen production, the OER is more important in the overall water splitting reaction because the OER, which requires four electrons, involves more electrons than the HER, which requires two electrons (Jang et al, 2020)
When Fe(NO3)3 as a precursor is dissolved in deionized water (DI), Fe3+ ions having higher reduction potential (Fe3+ + e− → Fe2+; 0.77 V) than Ni (Ni2+ + 2e− → Ni; −0.26 V) are formed
Summary
Electrocatalytic water splitting (H2O → 1/2 O2 + H2) for hydrogen generation is considered a clean and efficient hydrogen production approach. Precious-metal-based electrocatalysts, such as IrO2 and RuO2, are considered the ideal electrocatalyst for the OER owing to their high activity and superior durability (Fabbri et al, 2014; Jang et al, 2020; Choi et al, 2018). The complex processes lead to many variables in the development of large scale These faults are a serious obstacle to the application of LDHs as an OER electrocatalyst to commercial water electrolysis systems. NiFeLDH has excellent electrical conductivity between the NF and NiFe-LDH catalyst layer and a strong physical bond because it was grown directly on NF. This synthesis process is simple to apply to the fabrication of large size electrode and is considered to be applicable to commercialized alkaline water electrolysis
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