Oxygen Corrosion Engineering of Nonprecious Ternary Metal Hydroxides toward Oxygen Evolution Reaction

Abstract

Facile electrocatalyst development with minimum energy consumption is highly beneficial for practical water splitting. Scale up of lab-scale active catalysts presents challenges to this end. Here, we take advantage of the spontaneous corrosion electrochemistry to make nonprecious multi-metallic hydroxides for efficient oxygen evolution reaction in alkaline electrolytes. Ternary FeNiCr and FeCoCr hydroxides are developed by oxygen- and sulfate-mediated corrosion engineering of macroporous Fe foam substrates. Cr doping is successfully achieved for regulating and accelerating the in situ phase transformation of Ni active sites into oxyhydroxide active phase to afford high intrinsic electrocatalytic activity and surface-intermediate interactions. Low overpotentials of 323 and 329 mV are achieved for delivering a large current density of 500 mA cm–2 using FeNiCr and FeCoCr electrocatalysts, respectively. Long-term stability at large current densities, reproducible performance, and facile scale up obtained suggests a great potential of designing highly efficient multi-metal electrocatalysts for water electrolysis technologies by corrosion engineering.

Cooperative Boron and Vanadium Doping of Nickel Phosphides for Hydrogen Evolution in Alkaline and Anion Exchange Membrane Water/Seawater Electrolyzers

“…The peaks at 380 and 700 cm −1 correspond to the Fe-O bond in the FeOOH, and those at 470 and 550 cm −1 correspond to the NiO bond in the NiOOH. [36] These results confirm that the catalyst is NiFeOOH. The XRD pattern of NiFeOOH is shown in Figure S24b, Supporting Information.…”

Decoupling the contributions of industrially relevant conditions to the stability of binary and ternary FeNi-based catalysts for alkaline water oxidation

“…In this study, the binary FeNi and ternary FeNiCr hydroxides are firstly prepared over Fe foams (FeNi/FF and FeNiCr/FF) via a corrosion engineering approach reported in our previous study. 28 To monitor the catalyst degradation during the stability performance under simulated operation conditions in AWEs, a home-made three-electrode half-cell with independent control over current density, temperature, and electrolyte concentration is used (Fig. 1a).…”

“…According to these observations, several factors negate the synergistic effect of Cr on Fe and Ni active sites and contribute to the inferior performance of the ternary FeNiCr under the simulated industrial electrolytic conditions, i.e. , the significant Cr loss within the first 24 h, unfavourable phase transformation to a mixed state of γ- and β-NiOOH at the surface compared to the dominant β-NiOOH phase in FeNiCr under standard conditions, 28 and severe morphology change and physical loss of the catalyst. To further understand the impact of industrial conditions on the stability performance of FeNiCr/FF, the contribution of each industrial condition was decoupled, and independent long-term stability tests were carried out to investigate the extent to which varying current densities, temperatures, and electrolyte concentrations affect the degradation of ternary FeNiCr hydroxides.…”

Preparation of NiFeCoMnCr Hydroxide on Nickel Foam by Corrosion Method and its Enhanced Electrochemical Performance in Oxygen Evolution Reaction

“…Additionally, it facilitates direct growth of the catalyst on the support, crucial for minimizing contact resistance in electrochemical catalysts. Notable advancements include Xiaoge Li et al's rapid synthesis of NiFe LDH via ambient corrosion [22], Juan Luo et al's preparation of FeCo-(oxy)hydroxide through oxygen corrosion for OER [23], and Yang Xiao et al's simple creation of ternary FeNiCr and FeCoCr hydroxide using Fe foam as a substrate [24].…”