Layer‐by‐Layer Electrodeposition of FTO/TiO₂/Cu_xO/CeO₂ (1 <x< 2) Photocatalysts with High Peroxidase‐Like Activity by Greatly Enhanced Singlet Oxygen Generation

Abstract

Scheme 1. Schematic illustration of the layer-by-layer and the following surface etching process to prepare FTO/TiO 2 /Cu x O/CeO 2 : (Step I) electrodeposition of Cu 2 O on FTO/TiO 2 , (Step II) the controllable etching of Cu 2 O in the presence of NH 3 • H 2 O and Ce(NO 3 ) 3 .

Au/CeO2 NR Restricted Inside Cu-MOFs: A Three-in-One Artificial Enzyme with Synergistically Enhanced Peroxidase-Like Activity for Dual-Mode Sensing of Multiple Biomarkers

“…Especially, CeO 2 nanomaterials have captured great attention due to their adjustable morphologies, profuse oxygen vacancies and structure defects, and easily reversible oxidation states of CeO 2 (Ce 3+ /Ce 4+ ), which make them typical and prospective peroxidase mimics. , However, compared with natural peroxidases, such as horseradish peroxidase (HRP), the peroxidase-like activity of bare CeO 2 nanomaterial still remains to be improved . To date, diverse efforts have been devoted to ameliorate the peroxidase-like performance of CeO 2 -based nanomaterials, such as the adjustment of morphologies and crystal phases, the introduction of external environment stimuli (e.g., light), and the modification with other nanomaterials (e.g., noble metals and metal oxides). , Among these strategies, loading noble metals on CeO 2 surface to improve its catalytic performance is a promising strategy since introducing suitable heterogeneous atoms onto nanomaterials will commonly produce more surface defects . For example, the decoration of Pt nanoparticles on the surface of CeO 2 nanorods (CeO 2 NR) can facilitate the peroxidase-like activity clearly, which is mainly ascribed to the strong interaction between Pt nanoparticles and CeO 2 NR .…”

“…15 To date, diverse efforts have been devoted to ameliorate the peroxidase-like performance of CeO nanomaterials, such as the adjustment of morphologies and crystal phases, 14 the introduction of external environment stimuli (e.g., light), 16 and the modification with other nanomaterials (e.g., noble metals and metal oxides). 17,18 Among these strategies, loading noble metals on CeO 2 surface to improve its catalytic performance is a promising strategy since introducing suitable heterogeneous atoms onto nanomaterials will commonly produce more surface defects. 19 For example, the decoration of Pt nanoparticles on the surface of CeO 2 nanorods (CeO 2 NR) can facilitate the peroxidase-like activity clearly, which is mainly ascribed to the strong interaction between Pt nanoparticles and CeO 2 NR.…”