“…Copyright 2019, Springer Nature. (D) Schematic illustration of the formation of Au SAs on ZnO. Source : Reproduced with permission 208. Copyright 2020, Elsevier B.V…”
Section: Strategies For Fabrication Of Smacsmentioning
confidence: 99%
“…Through engineering of the step edge density, the mass loading of isolated SAs improved remarkably and the catalytic reactivity maximized 204 . Recently, Wu et al developed a ladder‐like ZnO with substantial step edge defects by accurately controlling the nucleation and growth rate to efficiently capture Au SAs (Figure 1d), showing an excellent sensing behavior for NO 2 gas 208 …”
Section: Strategies For Fabrication Of Smacsmentioning
confidence: 99%
“…In this case, the metal atoms' concentration, immobilization, and catalytic performance are significantly dependent on the density and stability of defects. Till now, several typical defects, such as anion defects including oxygen, 43,[176][177][178][179][180][181] carbon, 44,177,[182][183][184][185][186][187][188][189] and sulfur [190][191][192] vacancies, cation vacancies (like Ce, 193 Mo, [194][195][196][197] Ni, 45,198 Ti, [199][200][201] Co 127 ), coordinated-unsaturated metal sites 202,203 and even step edge, 177,[204][205][206][207][208] have been widely investigated and reported to be effective sites to synthesize SMACs.…”
Section: Defect Anchoringmentioning
confidence: 99%
“…204 Recently, Wu et al developed a ladder-like ZnO with substantial step edge defects by accurately controlling the nucleation and growth rate to efficiently capture Au SAs (Figure 1d), showing an excellent sensing behavior for NO 2 gas. 208 Overall, defect engineering is effective for synthesizing a number of SMACs, since isolated metal atoms could be well stabilized on defect sites due to the enhanced charge transfer and the strong metal-support interaction. Moreover, rationally tuning the defect concentration is able to alter the loading of metal SAs.…”
Single-metal-atom catalysts (SMACs) with the merits of maximum atom utilization, peculiar electronic structure, and adjustable coordination environment, have emerged as the rising stars. They are not only regarded as the promising electrocatalysts, but also show unconventionally excellent alkali storage, thus enabling them for energy devices. In this work, we review the up-to-date progress of single metal atom catalysts including the detailed synthetic strategies and all sorts of applications in energy storage and conversion. In addition, we also discuss intrinsic catalytic effects, degradation mechanism, modulation approaches, support structure design, current challenges, and potential development trends. This work may shed light on developing high-performance SMACs using a variety of strategies for catalytic and energy applications.
“…Copyright 2019, Springer Nature. (D) Schematic illustration of the formation of Au SAs on ZnO. Source : Reproduced with permission 208. Copyright 2020, Elsevier B.V…”
Section: Strategies For Fabrication Of Smacsmentioning
confidence: 99%
“…Through engineering of the step edge density, the mass loading of isolated SAs improved remarkably and the catalytic reactivity maximized 204 . Recently, Wu et al developed a ladder‐like ZnO with substantial step edge defects by accurately controlling the nucleation and growth rate to efficiently capture Au SAs (Figure 1d), showing an excellent sensing behavior for NO 2 gas 208 …”
Section: Strategies For Fabrication Of Smacsmentioning
confidence: 99%
“…In this case, the metal atoms' concentration, immobilization, and catalytic performance are significantly dependent on the density and stability of defects. Till now, several typical defects, such as anion defects including oxygen, 43,[176][177][178][179][180][181] carbon, 44,177,[182][183][184][185][186][187][188][189] and sulfur [190][191][192] vacancies, cation vacancies (like Ce, 193 Mo, [194][195][196][197] Ni, 45,198 Ti, [199][200][201] Co 127 ), coordinated-unsaturated metal sites 202,203 and even step edge, 177,[204][205][206][207][208] have been widely investigated and reported to be effective sites to synthesize SMACs.…”
Section: Defect Anchoringmentioning
confidence: 99%
“…204 Recently, Wu et al developed a ladder-like ZnO with substantial step edge defects by accurately controlling the nucleation and growth rate to efficiently capture Au SAs (Figure 1d), showing an excellent sensing behavior for NO 2 gas. 208 Overall, defect engineering is effective for synthesizing a number of SMACs, since isolated metal atoms could be well stabilized on defect sites due to the enhanced charge transfer and the strong metal-support interaction. Moreover, rationally tuning the defect concentration is able to alter the loading of metal SAs.…”
Single-metal-atom catalysts (SMACs) with the merits of maximum atom utilization, peculiar electronic structure, and adjustable coordination environment, have emerged as the rising stars. They are not only regarded as the promising electrocatalysts, but also show unconventionally excellent alkali storage, thus enabling them for energy devices. In this work, we review the up-to-date progress of single metal atom catalysts including the detailed synthetic strategies and all sorts of applications in energy storage and conversion. In addition, we also discuss intrinsic catalytic effects, degradation mechanism, modulation approaches, support structure design, current challenges, and potential development trends. This work may shed light on developing high-performance SMACs using a variety of strategies for catalytic and energy applications.
“…One frontier in the synthesis of single-atom site catalysts consists in locating highly distributed metal atoms onto the desired positions, forming site-special geometric framework to improve the intrinsic activity of metal sites [1][2][3][4][5][6] . For example, in the case of transition metal dichalcogenides (TMDs) materials that comprising active edges and inert basal plane, selectively modifying the single metal atoms into the edge or in-plane sites is pronouncedly crucial for their catalytic performance, due to differences in coordinated environment and steric configuration of metal sites.…”
Engineering the local three-dimensional structure of metal sites has important effect to maximize the activity and selectivity of single-atom site catalysts. Here, we engineer a strain-assisted single Pt sites structure on highly curved MoS 2 surface to enhance the H 2 S sensor property. Through introducing N-methyl-2-pyrrolidone (NMP) as guiding molecules, a multilayer MoS 2 structure with bending base planes is achieved. This bending behavior can not only inject uniform in-plane strain into the original inert MoS 2 basal plane but also introduce sufficient accessible sites to anchor Pt monomers. Further experimental and theoretical results show that the high-curvature MoS 2 surface endows 0.8% stretch strain onto the low-coordinated single Pt sites with a unique "tip" effect, which will lead to more accumulation of electrons around the Pt species, thus accelerating the electric transfer process between H 2 S and supports. The final catalyst delivers the pronouncedly enhanced H 2 S
Chemiresistive sensing is one of the most promising technologies for portable and miniaturized chemical sensing, with applications ranging from air quality monitoring to explosive detection and medical diagnostics. Recently, there have been growing efforts in developing microchip based chemical sensors operating at room temperature with high sensitivity, selectivity, spatial and temporal resolution, long‐term stability, and cost‐effectiveness. Here, the engineering of highly performing miniaturized gas sensors consisting of chemiresistive vertical indium phosphide nanowire (NW) arrays is reported for the first time, and their potential for the selective detection of nitrogen dioxide (NO2), a major air pollutant, is demonstrated. By carefully engineering the NW geometry (i.e., diameter and pitch), a superior sensing performance than those previously reported semiconductor‐based NO2 sensors is achieved, obtaining a limit of detection of 3.1 ppb at room temperature, with outstanding selectivity, and long‐term stability. Kinetic analysis and electrical simulation further reveal the array geometry correlated sensing mechanism, providing insights for the design of future NW array‐based devices. These findings indicate that, owing to their unique nanoscale structures, material properties, and CMOS compatible manufacture processes, III‐V compound semiconductor NW arrays present a new and promising chemical sensing platform for development of future high performance, miniaturized on‐chip sensing system.
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