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Single‐atom catalysts (SACs) are attractive candidates for oxygen reduction reaction (ORR). The catalytic performances of SACs are mainly determined by the surrounding microenvironment of single metal sites. Microenvironment engineering of SACs and understanding of the structure–activity relationship is critical, which remains challenging. Herein, a self‐sacrificing strategy is developed to synthesize...
Electrochemical synthesis of hydrogen peroxide (H2O2) via the 2‐electron oxygen reduction reaction (ORR) has emerged as a promising alternative to the energy‐intensive anthraquinone process and catalysts combining high selectivity with superior activity are crucial for enhancing the efficiency of H2O2 electrosynthesis. In recent years, single‐atom catalysts (SACs) with the merits of maximum atom utilization...
In the past decade, atomically dispersed Fe active sites (coordinated with nitrogen) on carbon materials (FeNC) have emerged rapidly as promising single‐atom catalysts (SACs) for the oxygen reduction reaction (ORR) to substitute precious group metal (PGM) catalysts, owing to their earth abundance and low cost. Nonetheless, the production of highly active FeNC SACs is largely restricted by material...
Oxygen Reduction
In article number 2104934, Xiaohua Yang, Long Zhao, Shuhui Sun, Jianming Zhang, and co‐workers describe an in‐situ silica xerogel synthetic strategy of an Fe‐N‐C single atom catalyst for the oxygen reduction reaction in metal‐air‐batteries. The silica xerogel, formed in‐situ with the Fe, N and C precursors, encourages the emergence of unique porosity and homogeneous protection to...
Atomically dispersed iron embedded carbon is a promising bifunctional catalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), but its exposed iron sites must be increased. Herein, the authors propose a double steric hindrance strategy by using zeolitic imidazolate frameworks‐8 as the first barrier skeleton and encapsulated phenylboronic acid as the second space obstruction...
Metal nanoparticles (NPs) with <10 nm have demonstrated many novel applications including surprisingly low melting point, astonishing liquid‐like pseudoelasticity, and outstanding hydrogen evolution performance. Here, a nanoscale self‐wetting driven monatomization of Ag NPs with <5 nm on carbon nitride (CN) to fabricate Ag single‐atom catalyst (Ag1/CN SAC) is demonstrated, and a thermodynamic...
The electrochemical dinitrogen (N2) reduction reaction (NRR) under ambient conditions has gained significant interest as an environmentally friendly alternative to the traditional Haber–Bosch process for the synthesis of ammonia (NH3). However, up to now, most of the reported NRR electrocatalysts with satisfactory catalytic activities have been hindered by the large overpotential in N2 activation...
CO2 Reduction
In article number 2107799, Wenyu Huang, Sen Zhang, Long Qi, and co‐workers achieve a benchmark study of various single‐atom transition metal catalysts for electrochemical reduction of CO2 to CO. The single‐atom Ni anchored on ordered mesoporous nitrogen assembly carbon catalyst, Ni‐NAC, possesses not only high CO selectivity and current density, but also high durability in a broad potential...
The electrochemical carbon dioxide reduction reaction (CO2RR) is a transformative technology to reduce the carbon footprint of modern society. Single‐site catalysts have been demonstrated as promising catalysts for CO2RR, but general synthetic methods for catalysts with high surface area and tunable single‐site metal composition still need to be developed to unambiguously investigate the structure–activity...
Single‐atom catalysts (SACs) hold the promise of utilizing 100% of the participating atoms in a reaction as active catalytic sites, achieving a remarkable boost in catalytic efficiency. Thus, they present great potential for noble metal‐based electrochemical application systems, such as water electrolyzers and fuel cells. However, their practical applications are severely hindered by intrinsic complications,...
Atomically dispersed metal catalysts often exhibit high catalytic performances, but the metal loading density must be kept low to avoid the formation of metal nanoparticles, making it difficult to improve the overall activity. Diverse strategies based on creating more anchoring sites (ASs) have been adopted to elevate the loading density. One problem of such traditional methods is that the single...
Single‐Atom Catalysts
The low loading of single‐atom catalysts makes it difficult to improve their overall activity. In article number 2200073, Ang Li, Erjun Kan, Li Song, Jinlong Gong, and co‐workers report a chemical scissors strategy to saturate the anchoring sites for single atoms, which elevates the loading of Pd single atoms even on bare substrate with only a few anchoring sites.
Single‐atom sites can not only act as active centers, but also serve as promising catalyst regulators and/or promoters. However, in many complex reaction systems such as electrochemical CO2 reduction reaction (CO2RR), the introduction of single‐atom regulators may inevitably induce the competitive hydrogen evolution reaction (HER) and thus reduce the selectivity. Here, the authors demonstrate that...
Nanostructured carbon materials with high porosity and desired chemical functionalities are of immense interest because of their wide application potentials in catalysis, environment, and energy storage. Herein, a top‐down templating strategy is presented for the facile synthesis of functional porous carbons, based on the direct carbonization of diverse organic precursors with commercially available...
Photocatalytic CO2 Reduction
SACs (single‐atom catalysts) have recently gained a lot of attention for their potential in various catalytic applications. In article number 2201428, Su‐Il In and co‐workers review the recent development of SACs for photocatalytic CO2 reduction, particularly focusing on performance challenges and strategies to achieve high catalytic activity, product selectivity, and...
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 cost‐effectiveness make SACs ideal for photocatalytic CO2 reduction. The activity, product selectivity, and photostability of SACs depend on various factors such as the nature...
Fe‐N‐C single‐atom catalysts (SACs) are emerging as a promising class of electrocatalysts for the oxygen reduction reaction (ORR) to replace Pt‐based catalysts. However, due to the limited loading of Fe for SACs and the inaccessibility of internal active sites, only a small portion of the sites near the external surface are able to contribute to the ORR activity. Here, this work reports a metal–organic...
Single‐atom catalysts (SACs) have attracted tremendous research interest due to their unique atomic structure, maximized atom utilization, and remarkable catalytic performance. Among the SACs, the carbon‐supported SACs have been widely investigated due to their easily controlled properties of the carbon substrates, such as the tunable morphologies, ordered porosity, and abundant anchoring sites. The...
Regulating the catalytic pathways of single‐atom sites in single atom catalysts (SACs) is an exciting debate at the moment, which has redirected the research towards understanding and modifying the single‐atom catalytic sites through various strategies including altering the coordination environment of single atom for desirable outcomes as well as increasing their number. One useful aspect concerning...
The improvement of lithium–sulfur batteries is still impeded by notorious shuttling effect and sluggish kinetics on the S cathode, and rampant Li dendrite formation on the Li anode makes it worse. Herein, a type of single‐atom dispersed Mo on nitrogen‐doped graphene (Mo/NG) with a distinctive Mo‐N2O2‐C coordination structure first serving as a multifunctional material is designed by a structure‐oriented...
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