Abstract
Recently, single-atom catalysts (SACs) have been found to be one of the promising candidates for oxygen electrocatalysis in rechargeable lithium-oxygen batteries (LOBs), owing to their high oxygen electrocatalytic activity and high stability originated from their unique coordination environments and electronic properties. As a new type of catalysts for LOBs, the advancements have never been reviewed and discussed comprehensively. Herein, the breakthroughs in the design of various types of SACs as the cathode catalysts for LOBs are summarized, including Co-based, Ru-based, and other types of SACs. Moreover, considerable emphasis is placed on the correlations between the structural feature of the SAC active sites and the electrocatalytic performance of LOBs. Finally, perspective and challenges of SACs for practical LOBs are also provided. This review could provide an intensive understanding of SACs for designing efficient oxygen electrocatalysis and offers a useful guideline for the development of SACs in the field of LOBs.
Heme biomolecule as redox mediator and oxygen shuttle for efficient charging of lithium-oxygen batteries