Hierarchical Architecture of Well‐Aligned Nanotubes Supported Bimetallic Catalysis for Efficient Oxygen Redox

Abstract

Rational design of efficient non‐precious materials for oxygen redox electrocatalysis is currently a critical obstacle for rechargeable zinc‐air batteries. Herein, this work presents a strategy to modulate the activity and mass transfer performance for advanced bifunctional electrocatalysts. This is achieved via a prior vacuum heat treatment‐assisted pyrolysis approach, obtaining atomically disperse Fe/Co sites and alloy nanoparticle composites rooted in the unique well‐aligned nanotubes hierarchical architecture. The design of multiple metal active species and hierarchically porous structure facilitates the bifunctional activity and accessibility of the active sites, respectively, which affords the catalyst enhanced performance in rechargeable zinc‐air batteries, outperforming the commercial Pt/C‐Ir/C benchmarks. This work provides a new avenue to improve activity and accessibility together with single atomic catalysts as advanced bifunctional air cathodes for efficient oxygen redox electrocatalysis.

Multifunctional metal-phosphide-based electrocatalysts for highly efficient solar hydrogen production integrated devices

“…Those results indicate that the sufficient active components and the hierarchically porous structure are critical for the excellent ORR activity. 42 The corresponding Tafel plots in Fig. 3c reveal the lower Tafel slope for NiFeP@p-NPCF, suggesting the favorable reaction kinetics toward ORR.…”

In situspace-confined growth of Co3O4nanoparticles inside N-doped hollow porous carbon nanospheres as bifunctional oxygen electrocatalysts for high-performance rechargeable zinc–air batteries

“…Generally, the density ratio of the D-to G-bands (I D /I G ) is used to measure the degree of disorder and graphitization for carbon materials and the smaller the I D /I G value, the higher the graphitization degree. [51][52][53] As the mass ratios of the Co to C elements in the precursors increase from 0%, 5%, 10% to 15%, the I D /I G values were calculated to be 1.26, 1.23, 1.19 and 1.17, suggesting that the introduction of more catalytic Co sites is conducive to the ordered arrangement of the graphite lattice. Moreover, the high I D /I G values surpassing 1 for all samples indicate the existence of sufficient structural defects, which conduces to the improvement of the oxygen electrocatalytic reaction.…”

An Ultrastable Bifunctional Electrocatalyst Derived from a Co2+-Anchored Covalent–Organic Framework for High-Efficiency ORR/OER and Rechargeable Zinc–Air Battery

“…with benefits from their high energy efficiency and eco-friendliness, − which can be influenced largely from the efficiency of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Their sluggish reaction kinetics requires efficient electrocatalysts to promote the reaction processes. − The Pt-, Ir-, and Ru-based noble-metal catalysts have been acknowledged with high catalytic activities, which however exhibit several intrinsic limitations, including the monofunctional activity, inferior durability, and low abundance. − Despite tremendous efforts that have been devoted so far, developing high-performance non-noble oxygen electrode catalysts remains a great challenge.…”