Modulating Anion Defect in La0.6sr0.4co0.8fe0.2o3-Δ for Enhanced Catalytic Performance on Peroxymonosulfate Activation: Importance of Hydrated Electrons and Metal-Oxygen Covalency

The Co d-band center modulation of LaCoO3−δfor improved peroxymonosulfate activation

“…2e) show that Co (III) and Co (II) coexist in LCO and LC 0.8 P 0.2 O, corresponding to the signals of ∼780 eV and ∼782.5 eV, respectively. 14 The Co (II) / Co (III) atomic ratio of LC 0.8 P 0.2 O is larger than that of LCO (Fig. 2f), suggesting that the mean valence state of Co decreases after P doping.…”

“…In our previous work, we reported the catalytic ability and mechanism of chlorine-or fluorine-doped La 0.6 Sr 0.4 Co 0.8 Fe 0.2 -O 3−δ in the PMS activation towards the degradation of bisphenol A (BPA). 14 The valence states of B-site cations and the content of oxygen vacancies have been positively changed for the activation. Furthermore, cation doping in A-or B-sites is widely accepted to alter the catalytic performance by adjusting the valence states of cations and the concentration of oxygen defects.…”

“…23 Similarly, we previously found that the B-site metal-oxygen covalency in La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3 may be the critical factor in the PMS activation. 14 Miao et al established a 'volcano-shaped' correlation between the catalytic PMS activation and e g electron filling of Co in LaCo 1−x Mn x O 3+δ . 24 It was also found that the high spin state of M-N moieties (M: Co, Fe, Mn, or Ni) in the transition metals on carbon matrices was beneficial for the electron transfer between PMS and catalysts, and positively related to the catalytic activity.…”