Modulating paired Ir–O–Ir via electronic perturbations of correlated Ir single atoms to overcome catalytic selectivity

Abstract

The active center of a paired Ir–O–Ir structure was generated via electronic perturbations of correlated Ir single atoms on Co3O4 nanosheets, and the O atom of which functioned as the main active site for the selective electrocatalysis of As(iii).

Electrochemical fabrication of multi-crystalline-amorphous heterogeneous single-atom electrocatalysts for alkaline oxygen evolution reaction

“…4c), three peaks (O 1 , O 2 and O 3 ) correspond to the lattice oxygen, the adsorbed oxygen on the surface and hydroxyl groups (–OH), respectively. 39 The O 1 binding energy shifts negatively after the CV electrodeposition, which is closely related to Co oxidation for forming amorphous CoO x , resulting in partial electron transfer from Co to O, creating electron-rich lattice oxygen. 34 According to the literature, the lattice oxygen can enhance the OER kinetics greatly based on the lattice oxygen mechanism.…”

“…The reduction of Ir valence states in CoP 2 @CN–Ir(300) weakens Ir–O–Co bonding and is not conducive to the improvement of OER activity. 39 Therefore, the introduction of Ir atoms during electrodeposition can affect the redox process, thus reconstructing the electronic structure of CoO x . By changing the electrodeposition conditions of Ir atoms, the number of oxygen atoms absorbed on the electrode surface can be fine-tuned, and the Co valence state of the substrate can be regulated.…”

Biocompatible Folic-Acid-Strengthened Ag–Ir Quantum Dot Nanozyme for Cell and Plant Root Imaging of Cysteine/Stress and Multichannel Monitoring of Hg2+ and Dopamine

“…Inspired by the plenitudinous –NH and –OH groups or aromatic heterocyclic rings of highly bioactive folic acid (FA), , and also the superior catalytic activity of Ag , and Ir, , folic-acid-strengthened Ag–Ir quantum dots (FA@Ag–Ir QDs) were constructed as an example in this work. The basic strategy was to controllably modify moderate FA onto the surface of Ag–Ir bimetal quantum dots via strong coordination between electron-rich O and N atoms or aromatic rings in FA and blank d orbitals of Ag or Ir atoms.…”

Highly-selective oxidation of benzyl alcohol to benzaldehyde over Co1/NC catalysts

“…In recent years, single atom catalysts (SACs) have emerged as a new and hot research frontier owing to the definite coordination structures and highly exposed active sites. 21–24 To date, various M–N–C (M typically refers to Fe, Co, Mn, Cu, Ni) catalysts with metal–N x sites have shown excellent selectivity in many fields, such as electro-catalytic, 25,26 organic-catalytic, 27,28 photo-catalytic 24,29 and so on. 30 Cobalt, as an earth-abundant transition metal, can exhibit various oxidation states (+3, +2, and 0), thus providing an adjustable coordination environment and promoting electron transfer, which has been widely used in heterogeneous catalysis.…”