Ultrathin Iron‐Cobalt Oxide Nanosheets with Abundant Oxygen Vacancies for the Oxygen Evolution Reaction

Electrochemical water splitting is a promising method for storing light/electrical energy in the form of H 2 fuel; however, it is limited by the sluggish anodic oxygen evolution reaction (OER). To improve the accessibility of H 2 production, it is necessary to develop an efficient OER catalyst with large surface area, abundant active sites, and good stability, through a low‐cost fabrication route. Herein, a facile solution reduction method using NaBH 4 as a reductant is developed to prepare iron‐cobalt oxide nanosheets (Fe x Co y ‐ONSs) with a large specific surface area (up to 261.1 m 2 g −1 ), ultrathin thickness (1.2 nm), and, importantly, abundant oxygen vacancies. The mass activity of Fe 1 Co 1 ‐ONS…

• AR
  Australian Research Council

  Awards: DP130102151, DP170103317