Switching the adsorption sites of PMS on SrCoO2.52 to enhance catalytic performance

Abstract

The strong adsorption of the exsolved A-site of SrCoO_2.52 (SC) perovskite with peroxymonosulfate (PMS) makes the effective activation of PMS challenging. A surface reconstruction strategy has been applied to enhance direct electron transfer from the active B-site to PMS. Thus, an interface architecture of Co₃O₄ nanoparticles in situ growing on the SC perovskite [SrCoO_3−δ@Co₃O₄ (SCC-2)] was developed, which exhibited enhanced catalytic activity. It was found that the surface reconstruction process not only transferred the adsorption site of PMS from the Sr to the Co site, but also enhanced the electron transfer ability of SCC-2. The formed Co–O metal–oxygen bridge facilitated the electron transfer from the bulk SrCoO_3−δ to the Co sites of surface Co₃O₄, thus enhancing the Co²⁺/Co³⁺ redox cycle. Compared with pristine SC, the PMS activation improved by 13.1%, and ENR degradation boosted by 1.23 times for SCC-2. This study can provide guidelines to design superior catalysts by surface reconstruction.