Cation vacancy driven efficient CoFe-LDH-based electrocatalysts for water splitting and Zn–air batteries

Abstract

Rational design of multifunctional electrocatalysts can optimize the mutual conversion of water and oxygen. CoFe-LDH-based electrocatalyst with highly tunable electronic, component, and catalytic properties have attracted considerable attention. Herein, we...

C≡N vacancy engineering of Prussian blue analogs for the advanced oxygen evolution reaction

“…Ni3S4 [37], Co3O4/NF [38], B-Co3O4/NF [39], Mo-NiCo2O4/Co5.47N/NF [40], CoFe LDH [41], Co0.7Fe0.3P3 [42], NiS/NF [43], Fe-Co-S/Cu2O/Cu [44], Co0.89Fe0.11O-N [45],…”

Enhancing the Surface-Active Sites of Bimetallic 2D Hydroxide Materials by Introducing Fe2+ Ions toward Effective Hydroxide Adsorption for the Water Oxidation Reaction

“…The host layer consists of mainly the active sites which are made of edge-sharing octahedral MO 6 units . Among the transition metals, particularly, Co-, Fe-, and Ni-based LDH materials are the most assuring metals for water electrolysis, although they have a less conductive nature due to their semiconducting or insulating nature, which affects the electron transfer process. − Again, in particular, recent research demonstrated that a CoFe-based LDH in alkaline electrolytes exhibits enhanced OER performance due to its strong synergistic effect between Fe and Co ions, creating a favorable electronic structure and local coordination atmosphere. Here also, the working of the CoFe-LDH is still limited by its sluggish water dissociation process and low electrically conductive nature. ,− However, for practical application, an increase in the catalytic efficiency of this electrocatalyst was very much needed.…”

Pentlandite Compound-Anchored CuSCN as a Stable Electrocatalyst in Highly Alkaline Solutions

“…30,31 Also, the metal vacancies may provide adhesion sites for externally induced metal ions (in the case of intercalation) and therefore may enhance the intrinsic properties by synergic effect. 32,33 • Currently, metal-sulfide-based catalysts encounter many challenges such as surface oxidation, change in metal valence state, material dissolution, and phase transition in highly basic electrolytes under oxidation potential. Surface oxidation is one of the major issues while using alkaline electrolytes like KOH (pH = 14) where sulfides react with oxygen to form S�O bonds, leaving a metallic bond.…”

“…However, bulk CuSCN has poor charge-transport properties, which can be overcome by elemental doping, structural defects, and suitable interface engineering. , The intrinsic acceptor property of CuSCN is associated with a copper deficiency. Thus, the formation of copper deficiency (vacancy) might induce charge-transfer properties by acting as an active site and promoting contact with the intermediate species of HER. , Also, the metal vacancies may provide adhesion sites for externally induced metal ions (in the case of intercalation) and therefore may enhance the intrinsic properties by synergic effect. , ·…”