General Design Concept of High-Performance Single-Atom-Site Catalysts for H<sub>2</sub>O<sub>2</sub> Electrosynthesis.
basic_science · Level V
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- Also identified by DOI 10.1002/adma.202314340.
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Abstract
Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) as a green oxidizing agent is widely used in various fields. Electrosynthesis of H<sub>2</sub>O<sub>2</sub> has gradually become a hotspot due to its convenient and environment-friendly features. Single-atom-site catalysts (SASCs) with uniform active sites are the ideal catalysts for the in-depth study of the reaction mechanism and structure-performance relationship. In this review, the outstanding achievements of SASCs in the electrosynthesis of H<sub>2</sub>O<sub>2</sub> through 2e<sup>-</sup> oxygen reduction reaction (ORR) and 2e<sup>-</sup> water oxygen reaction (WOR) in recent years, are summarized. First, the elementary steps of the two pathways and the roles of key intermediates (*OOH and *OH) in the reactions are systematically discussed. Next, the influence of the size effect, electronic structure regulation, the support/interfacial effect, the optimization of coordination microenvironments, and the SASCs-derived catalysts applied in 2e<sup>-</sup> ORR are systematically analyzed. Besides, the developments of SASCs in 2e<sup>-</sup> WOR are also overviewed. Finally, the research progress of H<sub>2</sub>O<sub>2</sub> electrosynthesis on SASCs is concluded, and an outlook on the rational design of SASCs is presented in conjunction with the design strategies and characterization techniques.