Hydrogen-substituted graphdiyne-assisted ultrafast sparking synthesis of metastable nanomaterials

A Library of High-Entropy-Alloy Nanocrystals with Controlled Surface Atomic Arrangements for Catalysis

“…High-entropy alloys (HEA) have shown unique properties with rich possibilities in many fields, which have become emerging areas in science and engineering [1][2][3] . While extensive studies have been focused on the fabrication of bulk and thin-film HEA, the recent advances in synthesizing HEA nanocrystals have expanded their applications in catalysis, environmental and energy-related applications [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] . Alloying multiple metallic elements into nanoparticles without a phase separation provides the promise of material properties that are inaccessible to each constituent, which has shown great scientific and technological potential.…”

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High-entropy-alloy (HEA) nanocrystals consisting of a minimum of five elements have recently emerged as a versatile family of catalysts due to immense chemical space and tunability 1-3 . However, there are no effective strategies for synthesizing libraries of HEA nanocrystals with controlled surface atomic structures of exposed facets for boosting catalytic performance [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] . Due to the distinct nucleation and growth kinetics of constituent metals and their distinctive crystal structures, it is incredibly challenging to confine five or more different metal species situated on the nanocrystal surface with a specific arrangement but also in a high-entropy random mixing state.

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A novel method for synthesizing one or two-dimensional metal oxide (hydroxide) nanomaterials using deep eutectic solvents

“…Nanomaterials are widely used in many fields due to their superior performance over bulk materials. [1][2][3][4] The process of obtaining nanoscale materials generally involves the use of various surfactants in order to prevent the nanocrystals from aggregating and growing too large during the reaction process. 5 It is, however, difficult to completely remove these surfactants from the surface of nanoparticles when using the washing method due to their strong adsorption ability.…”

Ni Anchored to Hydrogen-Substituted Graphdiyne for Lithium Sulfide Cathodes in Lithium–Sulfur Batteries

“…After evaporation of the solvent, the NiCl 2 /HGDY aerogel is touched on a hot plate (set to 450 °C) in an argon-filled glovebox, and a sparking reaction occurs, yielding Ni@HGDY (Figures 2a and S3). Our previous work suggests this ultrafast sparking synthesis, without further oxidizers, can reach 1600 K in 40 ms. 36 When the aerogel contacts the hot plate, the sparking reaction propagates throughout HGDY, reducing the Ni precursor and releasing chlorine (Figure S4). The entire aerogel changes from brown to black upon sparking, while preserving its shape.…”

“…The HGDY has larger pores (16.3 Å between opposing acetylene linkages) compared to traditional graphene-derived supports, allowing for superior ion transport while also providing good electronic conductivity from its π-conjugated network . Its high surface area also provides a high density of active centers . Furthermore, previous studies have indicated that the conjugated system of HGDY contributes to polysulfide trapping that would mitigate the shuttle effect. , Ni has shown great promise as a single-atom catalyst in Li–S batteries in Ni-N 3 , Ni-N 4 , and Ni-N 5 configurations and as nanoparticles. ,, Yet, we have seen few Li–S studies featuring Ni clusters or single atoms bound directly to carbon, particularly to HGDY and its acetylene linkages.…”