Advances in Synthesis and Applications of Single-Atom Catalysts for Metal Oxide-Based Gas Sensors

Abstract

As a stable, low-cost, environment-friendly, and gas-sensitive material, semiconductor metal oxides have been widely used for gas sensing. In the past few years, single-atom catalysts (SACs) have gained increasing attention in the field of gas sensing with the advantages of maximized atomic utilization and unique electronic and chemical properties and have successfully been applied to enhance the detection sensitivity and selectivity of metal oxide gas sensors. However, the application of SACs in gas sensors is still in its infancy. Herein, we critically review the recent advances and current status of single-atom catalysts in metal oxide gas sensors, providing some suggestions for the development of this field. The synthesis methods and characterization techniques of SAC-modified metal oxides are summarized. The interactions between SACs and metal oxides are crucial for the stable loading of single-atom catalysts and for improving gas-sensitive performance. Then, the current application progress of various SACs (Au, Pt, Cu, Ni, etc.) in metal oxide gas sensors is introduced. Finally, the challenges and perspectives of SACs in metal oxide gas sensors are presented.

Selectively activated suppressed quantum networks in self-assembled single-atom Ag catalyst-based room-temperature sensors for health monitoring

“…The monodispersion of Ag atoms was confirmed by extended X-ray absorption fine structure (EXAFS) analyses. 67 The absorption threshold of Ag K-edge from X-ray absorption near-edge spectra (XANES) (see ESI† for the K-edge absorption spectra of Ag foil, Ag 2 O and Ag@ n -octanol(ox)@CdS-QD_1) reveals that the oxidation state of Ag in –O − Ag δ + lies between 0 and 1. 68 This suggests a strong electrostatic interaction between O − and Ag δ + ionic species.…”

Waste Plastic-Supported Pd Single-Atom Catalyst for Hydrogenation

“…Catalysts with high efficiency, particularly single-atom catalysts (SACs), have become critical in modern energy and chemical industries, showcasing significant catalytic performance in various key industrial reactions such as selective hydrogenation [1][2][3][4][5][6], selective oxidation [7][8][9], dehydrogenation [10], hydrogen production [11,12], various coupling reactions [13][14][15], and classic electrochemical processes [16][17][18][19]. SACs, with high atomic utilization (~100%) and well-defined electronic geometric structures [20][21][22][23][24][25], are suitable for investigating the catalytic mechanisms and bridging the gap between homogeneous and heterogeneous catalysis [26]. In catalytic hydrogenation, catalysts with metals such as Pd, Pt, Au, and Ru, alongside metal oxide materials like TiO2, Cu2O, and CeO2 [27], display a broad range of applicability and notable advantages.…”