Research Progress and Application of Single-Atom Catalysts: A Review

He, He; Wang, Hudson Haocheng; Liu, Junjian; Liu, Xujun; Li, Weizun; Wang, Yannan

doi:10.3390/molecules26216501

Cited by 40 publications

(29 citation statements)

References 122 publications

(125 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To carry out the CO oxidation reaction, different strategies have been studied, the vast majority of which use an inorganic structure decorated with noble metals such as Pd, Pt, and Rh. [12][13][14][15][16][17][18][19] Among the most studied materials, cerium dioxide (CeO 2 ) stands out because of its excellent physicochemical properties, oxygen exchange capability, the possible creation of oxygen vacancies, and its redox characteristics. The application of ceria-based materials is determined by the electronic configuration of cerium and the high stability of its two valence states.…”

Section: Introductionmentioning

confidence: 99%

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

et al. 2022

View full text Add to dashboard Cite

One of the alternatives to decrease the concentration of CO is its oxidation reaction to CO 2 , which can be made more efficient using catalysts. In this work, it is shown that pyrochlore structures are a promising candidate to act as heterogeneous catalysts due to their chemical and physical properties. For use as a catalyst in this reaction, the Pr 2 Zr 2−x Fe x O 7±δ (x = 0, 0.05, 0.10, and 0.15) system was synthesized by the solvothermal method, firing the powder obtained at temperatures of 1200 and 1400 • C. The diffraction patterns confirmed the pyrochlore structure as the single phase in all the nominal compositions. The Brunauer-Emmett-Teller method and dynamic light-scattering analysis showed an increase in the particle size and a decrease in the specific surface area when increasing the iron concentration and increasing the calcination temperature. The compositions that presented the best catalytic activity were the samples with the highest iron concentration. Moreover, these samples were able to convert all the CO oxidation reactions in a narrower temperature range than a conventional CeO 2 sample. The presence of vacancies and the redox behavior of the elements present are the key factors for the catalysis of this system in the CO oxidation reaction.

show abstract

Section: Introductionmentioning

confidence: 99%

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

et al. 2022

View full text Add to dashboard Cite

show abstract

“…A defect-rich surface can aid the stable anchoring of metal SAs on support. Chang et al researched the anchoring of Pt SAs to a TiO 2 (110) surface. [152] Their theoretical and experimental investigations revealed that among five different sites on TiO 2 available for Pt adsorption, basal V O s most strongly bind Pt SAs, improving the interaction between Pt and TiO 2 .…”

Section: Active Sites and Co 2 Adsorption/activationmentioning

confidence: 99%

“…Several studies have been conducted to understand and improve the interaction between catalysts and H 2 O molecules. For instance, Pertik et al investigated H 2 O adsorption on V O -rich rutile TiO 2 (110). [158] Their experimental and theoretical investigations revealed that V O s in TiO 2 dissociate H 2 O by transferring a proton to a neighboring oxygen atom, resulting in the formation of two hydroxyl groups at each vacancy.…”

Section: Role Of H 2 O Moleculesmentioning

confidence: 99%

See 1 more Smart Citation

Single‐Atom Catalysts (SACs) for Photocatalytic CO₂ Reduction with H₂O: Activity, Product Selectivity, Stability, and Surface Chemistry

Hiragond

Powar

Lee

et al. 2022

Small

View full text Add to dashboard Cite

electrochemical, [7][8][9] thermo-, [10,11] and biocatalysis. [12,13] Converting CO 2 using readily available sunlight and water is one of the most promising strategies due to the following advantages: i) it utilizes solar light, a renewable energy, to drive the reduction of CO 2 , ii) it can convert CO 2 into valuable carbonaceous products like CO, CH 4 , C 2 H 6 , and CH 3 OH, iii) it operates under atmospheric conditions, iv) it is a controllable process, and v) it is scalable for industrial application. [14,15] Thus, converting undesirable CO 2 into value-added chemicals using artificial photosynthesis is a plausible way to address the current environmental and energy issues associated with the burning of fossil fuels. [16] Given the significance of photocatalytic CO 2 conversion, researchers have extensively researched various catalysts, such as metal oxides, alloys, chalcogenides, carbon-based structures, organic polymers, inorganic complexes, and MXenes. [17][18][19][20][21][22][23][24][25][26] However, low productivity, poor product selectivity, poor long-term stability, sluggish mechanisms, and economic unviability limit the application of these conventional catalysts. Furthermore, the solar to fuel conversion efficiency of most reported catalysts is less than 1%, which is insufficient for large-scale applications. Accordingly, the need for high-performance and economically viable catalysts has prompted research organizations to design and synthesize a range of materials that can advance CO 2 reduction technology and its commercial viability.It has been recognized that the downsizing of nanoparticles (NPs) of a catalyst exposes more active sites, leading to the optimization of its electronic properties. [27] Recently, catalysts based on size-and shape-controlled, atomically dispersed metals have garnered the attention of the scientific community for various energy and environmental applications. [28,29] Single-atom (SA) catalysts (SACs) are obtained once the size and aggregation of metal particles are reduced to isolated metal atoms, which form low coordination states and enable the use of almost 100% of active metal sites; the electronic properties of metal SAs differ from those of corresponding bulk materials. [30,31] In nature, the magnesium porphyrin complex in chlorophyll has an SA-like structure necessary for photosynthesis; the iron porphyrin complex in cytochrome has a similar SA-like structure which plays a vital role in the molecular transfer of CO 2 . [32][33][34] In recent years, single-atom catalysts (SACs) have attracted the interest of researchers owing to their suitability for various catalytic applications. For instance, their optoelectronic features, site-specific activity, and costeffectiveness make SACs ideal for photocatalytic CO 2 reduction. The activity, product selectivity, and photostability of SACs depend on various factors such as the nature of the metal/support material, the interaction between the metal atoms and support, light-harvesting ability, charge separation behavior, ...

show abstract

“…However, due to the accumulation of active centers, their catalytic effect is often not as good as natural enzymes . Since single-atom (SAs) materials were reported, more and more researchers have been attracted by the high atom utilization and extraordinary catalytic performance of SAs, , and they are committed to developing the unique value of SA materials in electrocatalysis . Many studies have shown that the development of SA catalytic materials in electrochemical detection applications has obvious potential value .…”

Section: Introductionmentioning

confidence: 99%

Fe Single-Atom Electrochemical Sensors for H₂O₂ Produced by Living Cells

Liang

Zhao

Zheng

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Reasonable sensor construction for precisely realtime detecting H 2 O 2 produced from living cells has always been of great significance and challenges. Due to the excellent catalytic efficiency and unparalleled peroxidase-like activity, single-atomic catalysts with Fe-N x active sites show great potential in H 2 O 2 detection. These special atomic active sites make it easier for the Fenton reaction to occur, which provides basic support for H 2 O 2 sensors. Their application in the in situ real-time detection of H 2 O 2 has important market prospects. Herein, single-atomic Fe catalysts with distorted graphitic carbon are obtained through a simpler preparation method. A precursor hemin@zeolitic imidazolate framework-8 (hemin@ZIF-8) is calcined at a high temperature and carbonized to get the nitrogen-carbon codoped Fe single atoms (Fe SAs-N/C) and then successfully prepare a H 2 O 2 electrochemical sensor by modifying it on a glassy carbon electrode (GCE). Its peroxidase activity is calculated by enzymatic kinetics, which shows a better peroxidase activity compared with horseradish peroxidase and other reported single-atom (SA) materials. Moreover, the electrocatalytic kinetics is explained by Laviron calculation, which more directly confirms that it has a faster electron transfer rate. Importantly, Fe SAs-N/C@GCE has a wider linear range than sensors combined with other SA materials and a low detection limit of 0.34 μM. It is an attractive design of H 2 O 2 sensors and single-atomic catalysts with superior substrate affinity that are novel alternatives to natural enzymes.

show abstract

Research Progress and Application of Single-Atom Catalysts: A Review

Cited by 40 publications

References 122 publications

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

Single‐Atom Catalysts (SACs) for Photocatalytic CO₂ Reduction with H₂O: Activity, Product Selectivity, Stability, and Surface Chemistry

Fe Single-Atom Electrochemical Sensors for H₂O₂ Produced by Living Cells

Contact Info

Product

Resources

About

Research Progress and Application of Single-Atom Catalysts: A Review

Cited by 40 publications

References 122 publications

The catalytic activity of the Pr2Zr2−xFexO7±δ system for the CO oxidation reaction

The catalytic activity of the Pr2Zr2−xFexO7±δ system for the CO oxidation reaction

Single‐Atom Catalysts (SACs) for Photocatalytic CO2 Reduction with H2O: Activity, Product Selectivity, Stability, and Surface Chemistry

Fe Single-Atom Electrochemical Sensors for H2O2 Produced by Living Cells

Contact Info

Product

Resources

About

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

The catalytic activity of the Pr₂Zr₂₋_xFe_xO_7±_δ system for the CO oxidation reaction

Single‐Atom Catalysts (SACs) for Photocatalytic CO₂ Reduction with H₂O: Activity, Product Selectivity, Stability, and Surface Chemistry

Fe Single-Atom Electrochemical Sensors for H₂O₂ Produced by Living Cells