Electrochemical oxidation of boron-doped nickel–iron layered double hydroxide for facile charge transfer in oxygen evolution electrocatalysts

Abstract

An electrochemically oxidized boron-doped NiFe LDH electrocatalyst was prepared and the electrocatalyst showed improved water oxidation performance.

Impact of Catalyst Reconstruction on the Durability of Anion Exchange Membrane Water Electrolysis

“…The results show that after the stability test, a trace amount of metal elements (Ni, Fe, Co) can be detected in the anolyte (Figure a, insert form). The detected concentration of Ni (0.39 ppm) was several times higher than those of Fe (0.07 ppm) and Co (0.06 ppm), indicating that Ni is easier to leach out from the catalyst in KOH than Fe and Co. Other than that, the B concentration (6.44 ppm) was 1–2 orders of magnitude higher than the three metal elements, which indicates that inorganic elements are more prone to loss under this operation condition. − XPS (Figure S4a–d) results show that after the stability test, the signal peaks of Ni 0 , Fe 0 , Co 0 , and B 0 on the catalyst’s surface all disappeared, and the signal peaks of Ni 2+ , Fe 3+ , Co 2+ , and B x+ all increased, indicating that the elements changed from the zero valence state to the oxidation state during the cell operation. , These oxidized elements can be unstable and may leach out from the catalyst surface under local pH change during electrolysis. ,− The local pH of the anode has been shown to be significantly lower than the bulk pH. − …”

Controlled synthesis of trimetallic nitrogen-incorporated CoNiFe layered double hydroxide electrocatalysts for boosting the oxygen evolution reaction

“… 27 Joo et al suggested that the addition of gaseous boronization into NiFe-LDH enhances the OER electrocatalytic activity. 29 This strategy increases the oxyhydroxides ratio of LDHs, which has a positive effect on the OER performance. 29 On the other hand, because of the poor electrical conductivity of the LDHs, carbon materials, including graphene oxide (GO) and carbon nanotubes, doped with heteroatoms, such as B, N, S, and P have been demonstrated to be electrochemically active.…”

“… 29 This strategy increases the oxyhydroxides ratio of LDHs, which has a positive effect on the OER performance. 29 On the other hand, because of the poor electrical conductivity of the LDHs, carbon materials, including graphene oxide (GO) and carbon nanotubes, doped with heteroatoms, such as B, N, S, and P have been demonstrated to be electrochemically active. Sun et al prepared vertically aligned ternary NiCoFe-LDHs on defect-rich and N-doped crumpled GO by in situ routes.…”

A comprehensive review on the electrochemical parameters and recent material development of electrochemical water splitting electrocatalysts

“…In-Kyoung Ahn et al reported boron-doped nickel-iron layered double hydroxide to facilitate charge transfer in oxygen evolution electrocatalysts. 173 B:NiFe LDH had 281 mV at 10 mA cm −2 which was further reduced to 229 mV through the electrochemical oxidation, maximizing the doing effect and activating the catalyst. EIS measurements confirmed that doping as well as activation reduced the charge transfer resistance.…”