High‐Performance Platinum‐Perovskite Composite Bifunctional Oxygen Electrocatalyst for Rechargeable Zn–Air Battery

Abstract

Constructing highly active electrocatalysts with superior stability at low cost is a must, and vital for the large‐scale application of rechargeable Zn–air batteries. Herein, a series of bifunctional composites with excellent electrochemical activity and durability based on platinum with the perovskite Sr(Co0.8Fe0.2)0.95P0.05O3−δ (SCFP) are synthesized via a facile but effective strategy. The optimal sample Pt‐SCFP/C‐12 exhibits outstanding bifunctional activity for the oxygen reduction reaction and oxygen evolution reaction with a potential difference of 0.73 V. Remarkably, the Zn–air battery based on this catalyst shows an initial discharge and charge potential of 1.25 and 2.02 V at 5 mA cm−2, accompanied by an excellent cycling stability. X‐ray photoelectron spectroscopy, X‐ray absorption near‐edge structure, and extended X‐ray absorption fine structure experiments demonstrate that the superior performance is due to the strong electronic interaction between Pt and SCFP that arises as a result of the rapid electron transfer via the PtOCo bonds as well as the higher concentration of surface oxygen vacancies. Meanwhile, the spillover effect between Pt and SCFP also can increase more active sites via lowering energy barrier and change the rate‐determining step on the catalysts surface. Undoubtedly, this work provides an efficient approach for developing low‐cost and highly active catalysts for wider application of electrochemical energy devices.

Facilitating Oxygen Redox on Manganese Oxide Nanosheets by Tuning Active Species and Oxygen Defects for Zinc‐Air Batteries

“…The performance and stability were also compared with Pt/C+IrO 2 catalyst (both 3 mg cm −2 ). Though the Pt/C+IrO 2 catalyst demonstrated better PPD (224 mW cm −2 ) (Figure 3b) and lower Δ V (0.72 V) than Co−MnO 2 (Figure 3c), it presented inferior cycling stability (Figure 3d), which was also reflected by other previous reports [27,67] . As displayed in Figure 3e, Co−MnO 2 also showed decent high‐rate performance with Δ V of ∼0.6 and ∼1.0 V at 1 and 30 mA cm −2 , respectively.…”

d-Orbital steered active sites through ligand editing on heterometal imidazole frameworks for rechargeable zinc-air battery

“…echargeable Zn-air batteries (ZABs) with four-time higher theoretical energy density, better safety, and lower cost are commonly considered as one of the most promising replacements for Li-ion batteries [1][2][3][4][5] . These superiorities mainly originate from oxygen-based electrochemistry in aqueous systems, but their full potential has yet to be realized because of high polarization and short lifespan at the air cathodes [6][7][8] . As such, the core of ZABs development lies in exploring air cathodes that are capable of efficiently catalyzing both oxygen reduction (ORR) and evolution reactions (OER) for long working periods [9][10][11][12] .…”

A Function‐Separated Design of Electrode for Realizing High‐Performance Hybrid Zinc Battery

“…On the other hand, the Ni x Co 1− x S 2 may provide a redox‐active surface for facilitating the redeposition of the dissolved Mn species. [ 62 ] The above excellent high‐rate galvanostatic charge–discharge performance and good cycling stability of the function‐separated MnS–Ni x Co 1− x S 2 electrode are better than most advanced cathodes for hybrid Zn batteries [ 15–18,23,26,29 ] and for Zn–air batteries, [ 31,63–72 ] as compared in Table S1 (Supporting Information).…”