Emerging Xene‐Based Single‐Atom Catalysts: Theory, Synthesis, and Catalytic Applications

Abstract

In recent years, the emergence of novel two‐dimensional monoelemental materials (Xenes), e.g., graphdiyne, borophene, phosphorene, antimonene, bismuthene, and stanene, has exhibited unprecedented potentials for their versatile applications as well as addressing new discoveries in fundamental science. Owing to their unique physicochemical, optical and electronic properties, emerging Xenes have been regarded as promising candidates in the community of single‐atom catalysts (SACs) as single‐atom active sites or support matrixes, for significant improvement in intrinsic activity and selectivity. In order to comprehensively understand the relationships between structure and property of Xene‐based SACs, this review represents a comprehensive summary from theoretical predictions to experimental investigations. Firstly, theoretical calculations regarding both the anchoring of Xene‐based single‐atom active sites on versatile support matrixes and doping/substituting heteroatoms at Xene‐based support matrixes are briefly summarized. Secondly, controlled synthesis and precise characterization are presented for Xene‐based SACs. Finally, current challenges and future opportunities for the development of Xene‐based SACs are highlighted.This article is protected by copyright. All rights reserved

Reveal Ultrafast Electron Relaxation across Sub-bands of Tellurium by Time- and Energy-Resolved Photoemission Microscopy

“…Elemental two-dimensional (2D) materials, such as borophene, silicene, stanene, phosphorene, and tellurene, have attracted great attention in recent years owing to their exotic electronic and optoelectronic properties and wide range of application prospects. − Although composed of a single element, elemental 2D materials exhibit multiple stable phases and novel electronic structures, − which are considered as appealing platforms to study electronic transport and topological physics. Among them, the newly discovered 2D tellurium evokes enormous interest for its excellent properties, such as ultrahigh carrier mobility, high on/off ratio, air-stability, great light absorption, and large thermoelectric coefficient at room temperature. − The unique chiral helix-chain structure of Te gives rise to its characteristic electronic energy bands and topological features. − Up to now, many effective strategies have been applied to improve the optoelectronic performance and stability of Te and analogous monoelemental materials (Xenes), such as element doping and heterostructure constructing. − Te-based high-performance optoelectronic devices have been realized, such as field-effect transistors, modulators, etc. For these new functional materials, understanding their carrier dynamics plays an important role in both fundamental research and practical applications.…”

A 2D-0D-2D Sandwich Heterostructure toward High-Performance Room-Temperature Gas Sensing

“…Compared with bulk BP and WS 2 , the slight blue shift of these modes for exfoliated BP and WS 2 can be attributed to the decrease in the number of layers (Figure S5 in the Supporting Information). ,, The intensity ratios of A 1 g /A 2 g and B 2g / A g 2 of BP for the exfoliated BP are obviously decreased compared with those for bulk BP (Figure S5b in the Supporting Information), indicating that the BP is partially oxidized during the exfoliation process. , However, the intensity ratio of B 2g / A g 2 of BP for the WS 2 -Au-BP-0.5 heterostructure is closer to that for bulk BP, indicating that the intercalation of a small amount of Au can inhibit the oxidation of few-layer BP. Additionally, the weak peak at 324 cm –1 corresponds to the bending vibrational frequency of bridging oxygen O–W–O, indicating that the exfoliated WS 2 is more likely to be oxidized due to the decreased number of layers . Actually, all the characteristic peaks of WS 2 and BP are also observed for WS 2 -BP-0.5 and WS 2 -Au-BP-0.5 heterostructures, and an obvious blue shift of these modes occurs due to the electron transfer between WS 2 and BP (Figure b), implying the formation of the heterostructure.…”

Fluorescence-Recovered Wearable Hydrogel Patch for In Vitro Detection of Glucose Based on Rare-Earth Nanoparticles

“…Together with the IVD detection development, the sensitive materials, structural design, hardware system, and software platform of sweat sensors have been studied by many teams worldwide. − Some heterostructure-related work devices have been developed. − Various strategies including electrochemical detection, colorimetric detection, and fluorescence detection have been used in sweat analysis. − Glucose molecules are detected in sweat by these strategies, which can infer the blood glucose level and calorie consumption of the human body. The output current of the sensor is detected by the electrochemical reaction of substances on the electrode surface by the method of electrochemical detection of glucose, and the concentration of the measured substances can be digitally demonstrated and realized. − There are many advantages using the electrochemical detection method, while this method has complicated structure, low portability, and some harm to the blood capillary.…”