Anionic formulation of electrolyte additive towards stable electrocatalytic oxygen evolution in seawater splitting

Anion Exchange Membrane Water Electrolyzer: Electrode Design, Lab-Scaled Testing System and Performance Evaluation

“…Since the dissolved Cltriggers a competitive chloride oxidation reaction (ClOR), which would release undesired chlorine-containing byproducts (e.g., Cl 2 , HClO), Yu et al screened out an anionic electrolyte additive that can facilitate a stable OER under seawater electrolyte. It revealed that phosphate ions promoted excellent performance stability, which resulted from repelling Cland preventing transition metal dissolution alleviating catalyst degradation, and serving as a local pH buffer to compensate for the rapid OHdepletion under high current electrolysis [215]. These results open a new research possibility in the alkalinized seawater electrolysis.…”

New age chloride shielding strategies for corrosion resistant direct seawater splitting

“…Having said that, the corrosion inhibition efficiency of the electrode against chlorides can be controlled by changing the nature of the electrolyte solution as well as tuning the electronic structure of the catalyst. 41,42 The incorporation of inhibitors into the electrolyte solution is considered as promising preventive agents against the corrosive nature of the electrode surface and offers a new pathway to prohibit the corrosion during seawater electrolysis. 43,44 Realizing the importance, the effectiveness of the inhibitors as well as electrocatalyst modifications toward the corrosion inhibition mechanism have been discussed in detail in the next sections.…”

“…The strength of the adsorptive interaction amongst the inhibitors and the electrocatalyst surface is influenced by the inherent properties of the inhibitor, such as electronic charges, polarizability, ionic potential, molecular structure, molecular volume, and HOMO-LUMO energy gap (DE), as evaluated from the quantum chemical and molecular dynamics simulation process. 30,38,42,45,46 The adsorptive interaction between the inhibitor molecule and the metal surface can be either physisorption or chemisorption in nature depending on the nature of the inhibitors, i.e., organic or inorganic. In case of the organic inhibitor (e.g., thiosemicarbazone derivatives, triazole-theophylline, and benzotriazole), the inhibitors have significant polar capacities containing electronegative functional groups and heteroatoms (N, S, O) that act as the adsorption center, which leads to electron donation to the unoccupied d orbitals of the metals in the electrode-forming coordination bonds.…”

“…45,46 On the other hand, the inorganic inhibitors generally form a negative charge layer at the anode surface mostly by the physisorption interaction amongst the metals and anions of the electrolyte by Coulombic force, preventing the approach of Cl À ions toward the anode via electrostatic repulsion. 42,43 Inorganic inhibitor. Very recently, Yu and his coworkers revealed the dynamic anticorrosion properties of phosphate inhibitor (inorganic) in highly alkaline seawater electrolysis based on the theoretical simulation calculation as well as in situ experimental studies.…”

Design Strategy of Corrosion-Resistant Electrodes for Seawater Electrolysis

“…To explore the resistance mechanism for Cl − using polyanions and the rejection effect of different polyanions, Yu et al [ 98 ] inserted corresponding anionic additives in the preparation process of NiFe-LDH and obtained a series of comparable samples. The electrochemical test showed that PO 4 3− had ideal ionic potential.…”