Rapid “self-healing” behavior induced by chloride anions to renew the Fe–Ni(oxy)hydroxide surface for long-term alkaline seawater electrolysis

Abstract

Due to the surface adsorption and interlayer insertion behavior of chloride anions, Fe-Ni(oxy)hydroxide catalytic surface is easily destroyed, making it difficult to be used for long-term seawater electrolysis. Here, we...

Construction of desert rose flower-shaped NiFe LDH-Ni3S2 heterostructures via seawater corrosion engineering for efficient water-urea splitting and seawater utilization

“…19,20 However, pristine LDH catalysts with loose hierarchical structure are prone to surface adsorption and interlamellar insertion of chloride ions, blocking the active catalytic centers. 21 Several strategies have been exploited to functionalize LDH to improve the catalyst performance in alkaline seawater. Fan et al developed an anodic corrosion strategy to in situ construct a chrysanthemum shaped Fe–Ni(oxy), disclosing superior catalytic activity in long-term alkaline seawater electrolysis.…”

Defect-Rich NiFeAl-Layered Double Hydroxide Nanosheets for Efficient Electrocatalytic Oxygen Evolution Reaction

“…Hence, low-cost and high-performance catalytic electrodes for the OER should be explored. Abundant and low-cost transition metal oxides, hydroxides, chalcogenides, and phosphates are promising alternatives to electrocatalysts based on noble metals. , As transition metal-based electrocatalysts, NiFe-layered double hydroxides (NiFe-LDHs) are considered promising OER electrocatalysts . However, the poor conductivity of NiFe-LDHs nanosheets and the inherent low catalytic activities of reaction sites usually inhibit OER performance enhancement.…”

“…9,10 As transition metal-based electrocatalysts, NiFe-layered double hydroxides (NiFe-LDHs) are considered promising OER electrocatalysts. 11 However, the poor conductivity of NiFe-LDHs nanosheets and the inherent low catalytic activities of reaction sites usually inhibit OER performance enhancement. To overcome these shortcomings, many researchers have constructed efficient OER electrocatalysts by element doping, 12,13 crystal engineering, 14−16 and defect engineering.…”

Highly efficient and stable oxygen evolution from seawater enabled by a hierarchical NiMoSx microcolumn@NiFe-layered double hydroxide nanosheet array

“…4 Direct electrolysis of seawater has become increasingly appealing due to the abundant seawater resource on our planet. [5][6][7][8][9][10] However, the abundant chloride ions (Cl − ) in seawater can gradually corrode the electrode and directly lead to undesirable but kinetically quick chlorine evolution reaction (CER) at the anode, which significantly inhibits the development of seawater electrolysis technology. [11][12][13] Both chlorine gas and hypochlorite can be generated from the CER at high oxidation potentials, competing with the oxygen evolution reaction (OER) and causing severe anode corrosion.…”