Constructing Ag Single Atoms and Nanoparticles Co‐Decorated CoO(O)H as Highly Active Electrocatalyst for Oxygen Evolution Reaction under Large Current Density

• DOI: 10.1002/adfm.202316539
• Publication Date: 2024-04-04T03:21:40Z
• Authors: Xiaoyan Guo; Huimin Zhang; Wei Xia; Mengyao Ma; Dong Cao; Daojian Cheng
• Keywords: Oxygen evolution

Abstract Developing highly active and stable electrocatalysts is essential for the large‐scale production of hydrogen from alkaline water. In this work, Ag single atoms nanoparticles co‐decorated Co hydro(oxy)oxide (Ag SAs&NPs@CoO(O)H) synthesized by a facile one‐step approach. Notably, overpotential SAs&NPs@CoO(O)H 200 mV at current density 50 mA cm −2 during oxygen evolution reaction (OER). Meanwhile, it can display mass activity 637.47 A g −1 under 300 mV, which 212.49 times higher than that commercial IrO 2 . Moreover, assembled Pt/C // system only requires 1.9 V to reach an industrial 1000 in water electrolyzer exhibits excellent stability large Furthermore, situ Raman spectroscopy analysis coupled with theoretical calculations reveals novel site switching mechanism found on SAs&NPs@CoO(O)H. Specifically, O* preferentially generates NPs then switches toward 3+ CoO(O)H produce OOH* O SAs lattice exert inhibitory force reconstruction process CoOOH Co(OH) , resulting anti‐dissolution stability.