Ultrafastly Interweaving Graphdiyne Nanochain on Arbitrary Substrates and Its Performance as a Supercapacitor Electrode

A moderate method is first developed here for superfast (in seconds) growth of an ultrafine graphdiyne (GDY) nanochain on arbitrary substrates in the atmosphere. This is an environmentally friendly and metal-catalyst-free method, efficiently eliminating extraneous contaminations for the carbon materials. The seamless GDY coating on any substrates demonstrates that an all-carbon GDY possesses outstanding controllability and processability, perfectly compensating for the drawbacks of prevailing all-carbon materials. After the decoration of 3D GDY nanostructures, the substrates become superhydrophobic with contact angles high up to of 148° and can be used as outstanding frameworks for storing organic pollution. Because of the reasonable porous and 3D continuous features, the as-prepared samples can be applied as high-performance binder-free supercapacitor electrodes with high area capacitance of up to 53.66 mF cm ^–2, prominent power performance, and robust long-term retention (99% after 1300 cycles)

Graphdiyne Sponge for Direct Collection of Oils from Water

Although several sponge-like sorbents have been developed to treat oil spills and chemical leakages, under harsh conditions (e.g., strong acid or alkali; oils on the sea) their efficiencies can be rather limited. Herein, we provide a graphdiyne sponge that is capable of collecting oil pollution effectively. This graphdiyne sponge exhibits excellent adsorption capacity (up to 160 times its own weight), robust stability (even when immersed in strong acid and alkali for 7 days), and remarkable recyclability (up to 100 times). These features suggest that this new adsorbent material might find applicability in the cleanup of oil spills and many organic pollutants under realistic conditions

Grape-Like Fe₃O₄ Agglomerates Grown on Graphene Nanosheets for Ultrafast and Stable Lithium Storage

An in situ simple and effective synthesis method is effectively exploited to construct MOF-derived grape-like architecture anchoring on nitrogen-doped graphene, in which ultrafine Fe₃O₄ nanoparticles are uniformly dispersed (Fe₃O₄@C/NG). In this hybrid hierarchical structure, new synergistic features are accessed. The graphene oxide plane with functional groups is expected to alleviate the aggregation problem in the MOFs’ growth. Moreover, the morphology and size of iron-based MOFs and carbon content are conveniently controlled by controlling the solution concentration of precursor. Through making use of in situ carbonization of the organic ligands in MOFs, Fe₃O₄ subunits are effectively protected by 3D interconnected conductive carbon at microscale. Consequently, when applied as anode materials, even as high as 10 A g^–1 after 1000 cycles, Fe₃O₄@C/NG still maintains as high as 458 mA h g^–1

Graphdiyne Sponge for Direct Collection of Oils from Water

Although several sponge-like sorbents have been developed to treat oil spills and chemical leakages, under harsh conditions (e.g., strong acid or alkali; oils on the sea) their efficiencies can be rather limited. Herein, we provide a graphdiyne sponge that is capable of collecting oil pollution effectively. This graphdiyne sponge exhibits excellent adsorption capacity (up to 160 times its own weight), robust stability (even when immersed in strong acid and alkali for 7 days), and remarkable recyclability (up to 100 times). These features suggest that this new adsorbent material might find applicability in the cleanup of oil spills and many organic pollutants under realistic conditions

Controlled Synthesis of a Three-Segment Heterostructure for High-Performance Overall Water Splitting

Developing earth-abundant, highly active, and robust electrocatalysts capable of both oxygen and hydrogen evolution reactions is crucial for the commercial success of renewable energy technologies. Here we demonstrate a facile and universal strategy for fabricating transition metal (TM) sulfides by controlling the atomic ratio of TM precursors for water splitting in basic media. Density functional theory calculations reveal that the incorporation of Fe/Co can significantly improve the catalytic performance. The optimal material exhibits extremely small overpotentials of 208 mV for oxygen evolution and 68 mV for hydrogen evolution at 10 mA cm^–2 with robust long-term stability. The optimized material was used as bifunctional electrodes for overall water splitting, which delivers 10 mA cm^–2 at a very low cell voltage of 1.44 V with robust stability over 80 h at 100 mA cm^–2 without degradation, much better than the combination of Pt and RuO₂ as benchmark catalysts. The excellent water-splitting performance sheds light on the promising potential of such sulfides as high activity and robust stable electrodes

Interfacial Synthesis of Conjugated Two-Dimensional N‑Graphdiyne

We explored the interfacial synthesis of 2D N-graphdiyne films at the gas/liquid and liquid/liquid interfaces. Triazine- or pyrazine-based monomers containing ethynyl group were polymerized through the Glaser coupling reactions at interfaces. Several layered, highly ordered and conjugated 2D N-graphdiyne were obtained. Their structures were characterized by TEM, SEM, AFM, XPS, and Raman spectra. Thin films with minimum thickness of 4 nm could be prepared