Durable Seawater Electrolysis through the Synergistic Effect of Oxidized MXene/Nickel Ferrite Composite Electrocatalyst.

Seawater electrolysis is a promising approach for sustainable and environmentally friendly hydrogen production, primarily because it has zero carbon emissions and mitigates freshwater resource scarcity. However, seawater electrolysis requires high selectivities for both the oxygen and hydrogen evolution reactions in an environment characterized by a high concentration of impurity ions, particularly Cl. In addition, the corrosion resistance of materials to byproducts is essential.

Intramolecular Double Activation by Biligands Sharing a Single Metal Atom for Preferred Two-Electron Oxygen Reduction.

It is challenging to selectively promote the two-electron oxygen reduction reaction (2e-ORR) since highly ORR-active electrocatalysts are not satisfied with 2e-ORR and are most likely to go all the way to 4e-ORR, completely reducing dioxygen to water. Recently, however, the possibility of a 2e-ORR preference over 4e-ORR was raised by extensively considering multiple ORR mechanisms and employing a potential-dependent activity measure for constructing volcano plots. Here, we realized the preferred 2e-ORR via an intramolecular double activation of the peroxide intermediate (*OOH) by allowing the intermediate to be easily desorbed before proceeding to 4e-ORR.

Low-Voltage Hydrogen Production via Hydrogen Peroxide Oxidation Facilitated by Oxo Ligand Axially Coordinated to Cobalt in Phthalocyanine Moiety.

A cobalt phthalocyanine having an electron-poor CoN (+δ) in its phthalocyanine moiety was presented as an electrocatalyst for hydrogen peroxide oxidation reaction (HPOR). We suggested that hydrogen peroxide as an electrolysis medium for hydrogen production and therefore as a hydrogen carrier, demonstrating that the electrocatalyst guaranteed high hydrogen production rate by hydrogen peroxide splitting. The electron deficiency of cobalt allows CoN to have the highly HPOR-active monovalent oxidation state and facilitates HPOR at small overpotentials range around the onset potential.

Bifunctional hydrous RuO nanocluster electrocatalyst embedded in carbon matrix for efficient and durable operation of rechargeable zinc-air batteries.

Ruthenium oxide (RuO) is the best oxygen evolution reaction (OER) electrocatalyst. Herein, we demonstrated that RuO can be also efficiently used as an oxygen reduction reaction (ORR) electrocatalyst, thereby serving as a bifunctional material for rechargeable Zn-air batteries. We found two forms of RuO (i.