Dual‐Atomic‐Site Catalysts for Molecular Oxygen Activation in Heterogeneous Thermo‐/Electro‐catalysis

Abstract

Efficient molecular oxygen activation (MOA) is the key to environmentally friendly catalytic oxidation reactions. In the last decade, single-atomic-site catalysts (SASCs) with nearly 100 % atomic utilization and unique electronic structure have been widely investigated for MOA. However, the single active site makes the activation effect unsatisfactory and difficult to deal with complex catalytic reactions. Recently, dual-atomic-site catalysts (DASCs) have provided a new idea for the effective activation of molecular oxygen (O 2 ) due to more diverse active sites and synergetic interactions among adjacent atoms. In this review, we systematically summarized the recent research progress of DASCs for MOA in heterogeneous thermo-and electrocatalysis. Finally, we look forward to the challenges and application prospects in the construction of DASCs for MOA.

Improved redox synthesis of Mn–Co bimetallic oxide catalysts using citric acid and their toluene oxidation activity

“…Similarly, in the field of catalytic oxidation, the activation of molecular oxygen is an extremely important step, and the construction of a catalytic surface for the activation of molecular oxygen is essential. 37 Gu et al 38 verified that a small amount of water enhances the catalytic oxidation of VOCs to transition metal oxides by activating lattice oxygen in the catalyst and forming hydroxyl species to attack the electron-deficient carbon in VOC. Montemore et al 39 have addressed the process of oxygen activation on metal surfaces is a critical process for multiphase catalysis.…”

Layer Growth Inhibiting Strategy for Superior-Loading Atomic Metal Sites on Ultrathin Layered Double Hydroxides as the Efficient Chemiluminescence Probes

“…Due to the uniform active sites and outstanding catalytic practicability, single-atom catalysts (SACs) have emerged as the new-generation enzyme mimics. − Isolated metal atoms with high Gibbs free energy were anchored and stabilized on various supports to form homogenous SACs through many techniques including coordination binding, defect design, and spatial limitation. − The isolated metal sites endow SACs with the maximal atomic utilization rate and thus eminent catalytic properties. , Note that the loading amount of active metal sites is the vital aspect of the catalytic capability of typical atomic-scale catalysts. In order to advance the loading effectiveness of metal centers on atomic catalysts, many efforts have been made to investigate the site categories on loading efficiency, including dual atomic sites, multiple active centers, and synergistic cluster/nanoparticle-assisted atomic moieties. − Unfortunately, the loading quantity of active centers of homogenous SACs or their composite counterparts hardly surpasses 5 wt %, which inevitably obstructs the further catalysis enhancement of atomic-scale catalysts. − Owing to the strict maintenance of the atomic dispersion states, it is difficult to prevent the aggregation of metal atoms in a high loading proportion. It is worth noting that Pt SACs with a loading efficiency of 41.8 wt % were obtained on the basis of the formation of high defect density by a laser-planting strategy.…”

Electron Donation from Boron Suboxides via Strong p–d Orbital Hybridization Boosts Molecular O2 Activation on Ru/TiO2 for Low-Temperature Dibromomethane Oxidation

“…Activation of molecular oxygen is of prime importance in a heterogeneous catalytic oxidation process . The generated reactive oxygen species (ROS) are directly involved in VOC oxidation and are the key to realizing total oxidation at low temperatures.…”

“…Activation of molecular oxygen is of prime importance in a heterogeneous catalytic oxidation process. 12 The generated reactive oxygen species (ROS) are directly involved in VOC oxidation and are the key to realizing total oxidation at low temperatures. However, molecular O 2 with a spin-forbidden nature restrains its activation under wild conditions (i.e., need high temperature or with the help of photo/electro energy), thus effective O 2 activation has been a long-term challenge for low-temperature catalytic oxidation.…”