candidates for energy conversion and storage systems [2] (hybrid/electric vehicles, portable and wearable devices, and seismic telemetry) due to their high theoretical energy density (1086 Wh kg −1 ), low cost, safety, and environment-friendliness. [3] However, the sluggish kinetics of the reversible oxygen reduction and oxygen evolution reaction (OER) involving air cathode restrict their practical applications. [4] Therefore, rational design of highly efficient and low-cost bifunctional electrocatalysts is essential to facilitate large-scale commercialization of rechargeable ZABs.Single atom catalysts (SACs) have drawn broad attentions in energy conversion devices due to their unique electronic structure, quantum size effect, and maxi mum atomic utilization. [5] Recently, SACs are extensively used in catalyzing oxygen reduction reaction (ORR), [6] but their catalytic abilities to reverse OER is not satisfactory, which brings enormous challenges for synthesis of efficient ORR/OER bifunctional SACs. [7] Dual SACs (DACs) with multiple metal sites can optimize the electronic structure of the active centers and induce more complex reactions. [8] However, almost all the reported DACs are co-existing on the same side of carbon layers with random distribution, which may lead to possible mutual interference between two different single atoms (SAs) and competition of rate-limiting steps (RDSs) during ORR and OER. [9] Although synergistic effects of DACs have been demonstrated, the reaction mechanisms for boosting reversible ORR/OER are still unclear, [10] and precise synthesis and identification of the DACs for the specific reactions remain ambiguous. [11] Therefore, accurate construction of DACs with highly efficient ORR and OER still faces many challenges.Janus composite materials possess extensive applications in optical imaging, [12] emulsion stabilizer, [13] catalysis, [14] and drug delivery. [15] Recently, Janus nanomaterials exhibit various applications in the catalytic fields, such as two-phase catalysis, photocatalysis, and biocompatible catalysis. [16,17] The coupling interface of Janus structure can provide general principles for the design of electrocatalysts. 1) Janus structure can possess diversiform catalytic properties with the addition of bifunctional or Dual single atoms catalysts have promising application in bifunctional electrocatalysis due to their synergistic effect. However, how to balance the competition between rate-limiting steps (RDSs) of reversible oxygen reduction and oxygen evolution reaction (OER) and fully expose the active centers by reasonable structure design remain enormous challenges. Herein, Fe/N 4 and Ni/N 4 sites separated on different sides of the carbon nanosheets with Janus structure (FeNi jns /NC) is synthesized by layer-by-layer assembly method. Experiments and calculations reveal that the side of Fe/N 4 is beneficial to oxygen reduction reaction (ORR) and the Ni/N 4 side is preferred to OER. Such Janus structure can take full advantage of two separate-sides of carbon na...
By exploring liquid-phase exfoliation in imidazolium ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6), with the help of a two-step ultrasonic, the high-yield few-layered black phosphorus (BP) flake with 1.3-1.75 nm in thickness...
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