Room-Temperature Synthesis FeNiCo Layered Double Hydroxide as an Excellent Electrochemical Water Oxidation Catalyst

Abstract

Layered double hydroxides (LDH) have attracted tremendous attention in a variety of areas, including catalysis, energy storage, drug delivery, etc. Herein, we report a simple coprecipitation method to prepare highly active electrochemical catalysts of FeNiCo LDH at room temperature. In alkaline media, the as-obtained FeNi2Co2 LDH shows superior electrocatalytic activity toward water oxidation with an overpotential of 232 mV at 10 mA/cm2 and a low Tafel slope of 48 mV/dec, comparable to most of the reported noble-metal free OER catalysts. The suitable electronic structures as well as reduced charge transfer resistance that promote the electrons transfer during the OER process are proposed to be the two critical factors that lower the overpotential of the catalytic reaction.

TM LDH Meets Birnessite: A 2D‐2D Hybrid Catalyst with Long‐Term Stability for Water Oxidation at Industrial Operating Conditions

“…Firstly,the ECSA was estimated by the simple CV method (Figure S15). [18] Thec alculated double layer capacitance, which is linearly related to ECSA, was close to each other for the two birnessites (Figure 3G), in accordance with their similar atomic structure (SEM, XRD and TEM). This suggests that ECSA would not be the major factor for the distinctly different OER performance between LDH-Bir and K-Bir.…”

Dispersing transition metal vacancies in layered double hydroxides by ionic reductive complexation extraction for efficient water oxidation

“…The oxygen evolution reaction (OER) that involves a four-proton-coupled electron transfer process and one oxygen-oxygen double bond formation is regarded as the rate-determining half reaction of water splitting, highlighting the importance of OER catalysts, especially the non-noble metal ones. 1 Among noble-metal free OER catalysts, transition metal based layered double hydroxides (TM LDHs), [2][3][4] especially nickel-based LDHs such as NiFe LDH, [5][6][7] NiV LDH, 8,9 NiCr LDH, 10 NiCoFe LDH, 11,12 etc., exhibit the most efficient performance toward water oxidation. 3,13,14 However, little research has been done on NiCu LDH for the OER, due to the low catalytic activity of Cu ions and the weak synergistic effects between Ni and Cu.…”

Synthesis and Characterization of Layered Double Hydroxides as Materials for Electrocatalytic Applications

“…Furthermore, the third metal could also increase the available catalytic sites if the synthesis leads to porous structures or thinner sheets, and allow the generation of high-valence metal centers. Many attempts have been made to incorporate Co into Ni/Fe LDHs with the aim to reduce the thickness of the nanosheets [ 68 ] and to introduce high valence metal centers [ 69 ]. The addition of V to Ni/Fe LDHs guarantees a lower energy barrier for the step going from OH* to O* and the presence of a higher number of active centers on the catalyst surface [ 70 ].…”