Atomic iridium@cobalt nanosheets for dinuclear tandem water oxidation

Abstract

Atomic Ir@Co nanosheets were synthesized by an atomically confined alloying strategy for effectively catalyzing the OER via a new dinuclear cooperative mechanism.

Recent progress on precious metal single atom materials for water splitting catalysis

“…Owing to the potential in large‐scale application, wet chemistry method has been widely employed in the synthesis of single atom materials. The wet chemistry method includes ion exchange, 84 impregnation, 85–87 coprecipitation, 88–90 chemical reduction, 91–93 etc. The ion‐exchange approach based on the different migration rates of metal ions, which known as kirkendall effect, can be referred to synthesize the isolated metal atom catalysts with high loading amounts.…”

“…As a result, the electrocatalysts with excellent activity and stability are urgent demanded to overcome such problem. In order to efficiently improve the intrinsic catalytic activity of OER, the electronic structure of active centers has been specifically tailored through the interactions between single precious metal atoms and supports 69,83,85,89,114–117 . There are two strategies to enhance the OER performance of SACs: incorporating new active sites and enhancing the activity of original active sites.…”

“…In addition, the OER activity of PMSACs could be enhanced through both two strategies. An electrocatalyst with Ir single atoms anchored on Co nanosheets displayed a low overpotential of 267 mV at 10 mA/cm 2 in 1 M KOH 89 . The Ir–Co dinuclear sites was considered as the active centers, in which hydroxyl group tends to adsorb on Co sites and dissociates into adsorbed O*, then further transfer to Ir–O* via a Co–O–Ir intermediate subsequently.…”

Recent developments in the use of single-atom catalysts for water splitting

“…These metal substrates are considered to provide surface defects which fix the foreign metal atoms, while modulating the electronic structure of the foreign metal atoms via ligand effects and strain effects. After doping other metal atoms into metal substrates, these catalysts are translated to alloys, which combine the properties for alloy catalysts and SACs, leading to remarkable activities that are significantly higher than those of typical alloy catalysts [76,82,106,[110][111][112][113]. For HER, Pt-based catalysts are regarded as the most effective catalysts.…”

Profuse Surface Activation of Ir‐Dispersed Titanium Nitride Bifunctional Electrocatalysts

“…[ 22 ] For instance, Dickson et al, provided excellent OER performance in cobalt nanosheets with single‐atom iridium trapping. [ 23 ] Similarly, in IrNi‐mixed oxide nanostructures, the bimetallic effect resulted in a clear improvement toward OER catalysis. [ 24,25 ] Furthermore, Ir‐based nanoparticles have been reported as an excellent alternative with improved hydrogen evolution reaction (HER) efficiency in acidic media.…”