Overturned Loading of Inert CeO₂to Active Co₃O₄for Unusually Improved Catalytic Activity in Fenton‐Like Reactions

Abstract

In the past decades, numerous efforts have been devoted to improving the catalytic activity of nanocomposites by either exposing more active sites or regulating the interaction between the support and nanoparticles while keeping the structure of the active sites unchanged. Here, we report the fabrication of a Co3O4−CeO2 nanocomposite via overturning the loading direction, i.e., loading an inert CeO2 support onto active Co3O4 nanoparticles. The resultant catalyst exhibits unexpectedly higher activity and stability in peroxymonosulfate‐based Fenton‐like reactions than its analog prepared by the traditional impregnation method. Abundant oxygen vacancies (Ov with a Co⋅⋅⋅Ov⋅⋅⋅Ce structure instead of Co⋅⋅⋅Ov) are generated as new active sites to facilitate the cleavage of the peroxide bond to produce SO4.− and accelerate the rate‐limiting step, i.e., the desorption of SO4.−, affording improved activity. This strategy is a new direction for boosting the catalytic activity of nanocomposite catalysts in various scenarios, including environmental remediation and energy applications.

Boosted N2 Activation through 4f–2p–3d Orbital Hybridization for Efficient Nitrate Electrosynthesis

“…43‐1003). [ 16,18,20,23 ] Notably, the XRD patterns of Ce–Co 3 O 4 also exhibit diffraction peaks at 28.55°, consistent with the (111) planes of the CeO 2 phase (JCPDS No. 43‐1002).…”

“…43‐1002). [ 20,23 ] The diffraction peaks of Ce–Co 3 O 4 display a slight shift toward lower angles compared to those of Co 3 O 4 , implying enlarged lattice spacings in Ce–Co 3 O 4 upon the introduction of Ce. Collectively, these findings confirm the successful incorporation of Ce atoms into the Co 3 O 4 crystal lattice.…”

Highly Efficient Peroxymonosulfate Activation on Electron‐Enriched Ruthenium Dual‐Atom Sites Catalysts for Enhanced Water Purification

“…To identify the main reactive species, methanol (MeOH, radical scavenger for •OH and •SO 4 − ), ethanol (EtOH, radical scavenger for •OH), β ‐carotene (radical scavenger for 1 O 2 ), p‐benzoquinone ( p ‐BQ, a scavenger for •O 2 − ) are used as Fenton‐like reactions radical scavengers. [ 40 ] With the addition of EtOH and MeOH (Figure 3f), the degradation rate of NPX decreased sharply in both the Ru 2 N 6 ‐C/PMS system and the FeN 4 ‐C/PMS system. However, when β ‐carotene and p ‐BQ are used as quenchers, the degradation efficiency of NPX decreased slowly.…”

Atomically Dispersed Pt‐Doped Co3O4 Spinel Nanoparticles Embedded in Polyhedron Frames for Robust Propane Oxidation at Low Temperature

“…[41] Two major peaks in the O 1s spectra, located at around 529.75 and 530.81 eV (Figure 1f; and Figure S7d, Supporting Information), can be attributed to surface lattice oxygen species (O 2− , termed as O latt ) and surface-adsorbed oxygen species (such as O − and O 2 − , denoted as O ads ). [42,43] It is generally acknowledged that O ads species have far better reactivity and higher mobility, contributing more to the full oxidation of propane. [44] Based on the corresponding peak areas, the associated O ads species proportions in various catalysts were estimated, and the results revealed that Pt-Co 3 O 4 NPs/PFs catalysts had an O ads species ratio that was much greater than that of Co 3 O 4 NPs/PFs catalyst.…”