Facile Synthesis of Vertical Layered Double Hydroxides Nanosheets on Co@Carbon Nanoframes as Robust Bifunctional Oxygen Electrocatalysts for Rechargeable Zn–Air Batteries

• DOI: 10.1002/sstr.202300111
• Publication Date: 2023-10-06T17:31:31Z
• Authors: Fangfang Chang; Hongnan Du; Panpan Su; Yanhui Sun; Runping Ye; Qiang Tian; Guoxin Zhang; Haitao Li; Jian Liu
• Keywords: Layered double hydroxides; Overpotential; Oxygen evolution; Bifunctional catalyst; Carbon fibers; Hydrotalcite

The development of efficient and low‐cost bifunctional catalysts for oxygen reduction reaction (ORR) evolution (OER) is imperative but remains challenging in rechargeable zinc–air batteries. Herein, a metal oxidation‐assisted approach developed the facile synthesis highly catalyst (Co@NC@LDHs) which composed layered double hydroxides (LDHs) nanosheets situ vertically grown on surface hollow carbon nanoframes encapsulating Co nanoparticles (Co@NC). Specifically, vertical LDHs distributing ensure maximized number accessible active sites interaction between with matrix. hierarchically structured Co@NC@LDHs display an overpotential 0.33 V at 10 mA cm −2 OER half‐wave potential 0.88 ORR. gap (Δ E ) calculated to be 0.68 V, outperforming mixed Pt/C + RuO 2 = 0.77 V), manifesting its superior electrocatalysis performance. Moreover, Zn–air batteries based electrocatalyst exhibit high peak power density (185.2 mW excellent durability (5.0 over 500 h). This work may provide strategy fabrication substrate, acting as broad energy‐related applications.