Cobalt Assisted Synthesis of IrCu Hollow Octahedral Nanocages as Highly Active Electrocatalysts toward Oxygen Evolution Reaction

Abstract

Development of oxygen evolution reaction (OER) catalysts with reduced precious metal content while enhancing catalytic performance has been of pivotal importance in cost‐effective design of acid polymer electrolyte membrane water electrolyzers. Hollow multimetallic nanostructures with well‐defined facets are ideally suited for saving the usage of expensive precious metals as well as boosting catalytic performances; however, Ir‐based hollow nanocatalysts have rarely been reported. Here, a very simple synthetic scheme is reported for the preparation of hollow octahedral nanocages of Co‐doped IrCu alloy with readily tunable morphology and size. The Co‐doped IrCu octahedral nanocages show excellent electrocatalytic activity and long‐term durability for OER in acidic media. Notably, their OER activity represents one of the best performances among Ir‐based acidic OER catalysts.

Ni@Ru and NiCo@Ru Core–Shell Hexagonal Nanosandwiches with a Compositionally Tunable Core and a Regioselectively Grown Shell

“…Ru‐ and Ir‐based catalysts have demonstrated promising electrocatalytic activity for the OER, yet these precious metal catalysts are expensive and scarce. As a means of reducing the usage of precious metals, Ru‐ or Ir‐based nanocage and nanoframe structures have been investigated for the OER . They have shown enhanced OER activities as a result of their enlarged catalytically active surface areas per unit mass.…”

Iridium‐Based Multimetallic Porous Hollow Nanocrystals for Efficient Overall‐Water‐Splitting Catalysis

“…[26][27][28] This effect has been rationalized by d-band center theory, a descriptor for the relationship between the distribution of d-band electron and adsorption energy. [32][33][34] By exposing the high-density external and internal surfaces to reactants, collision frequency between reaction sites and active species can be increased, leading to the enhanced catalytic performance. Nanocrystals of hollow feature such as nanoframes and nanocages can reduce the amount of expensive precious metals and expose more active surface area.…”

Hierarchical Hollow Nanoprisms Based on Ultrathin Ni‐Fe Layered Double Hydroxide Nanosheets with Enhanced Electrocatalytic Activity towards Oxygen Evolution

“…[34,[36][37][38][39] Compared with the bulk solid counterparts,h ollow configurations with larger surface areas usually endow catalysts with ah igher density of surface-exposed active sites.Moreover,their large void space could effectively reduce ionic transport resistance and the ion diffusion lengths for surface reactions. [34] Very recently,afew pioneering studies have described the successful generation of hollow nanostructured (oxy)hydroxides towards water oxidation with encouraging results.…”

“…[34] Very recently,afew pioneering studies have described the successful generation of hollow nanostructured (oxy)hydroxides towards water oxidation with encouraging results. [37,38,[40][41][42][43][44][45][46] Forexample,Y an and co-workers have reported the synthesis of a-Ni(OH) 2 hollow nanospheres through at emplate-free method. [40] Thea s-obtained hierarchical hollow nanospheres displayed enhanced OER activity compared with b-Ni(OH) 2 nanoplates/nanoparticles.S hi et al have reported the preparation of VOOH hollow nanospheres through as imilar hydrothermal strategy.…”