Single layered TiC(OH) nanosheets have been successfully fabricated by etching its TiAlC precursor with KOH in the presence of a small amount of water. The OH group replaced the Al layer within the TiAlC structure during etching, and TiC(OH) nanosheets could be easily and efficiently achieved through a simple washing process. The delaminated single-layered nanosheets are clearly revealed by atomic force microscopy to be several micrometers in lateral size. Interestingly, the exfoliated TiC(OH) nanosheets could be restacked to form a new layer-structured material after drying. When redispersing this restacked TiC(OH) materials in water again, it could be re-delaminated easily only after shaking for several hours. The easy delamination and restacking properties, coupled with intrinsic metallic conductivity and hydrophilicity, make it an ideal two-dimensional building block for fabricating a wide variety of functional materials.
All aglow: Both a fluorescent biosensor, composed of a circularly permuted yellow fluorescent protein (cpYFP), and a small‐molecule fluorescent probe (1) for the detection of CO in living cells have been recently reported. Though different these novel probes were designed based on the unique binding ability of CO to transition‐metal ions.
Electrolyte-accessibly porous yet densely packed MXene composite electrodes with high ion-accessible surface and rapid ion transport rate have shown exceptional promise for high-volumetric-performance supercapacitors (SCs), but they are largely limited by the insufficient rate capability and poor electrochemical cyclability, in association with the instability in mechanical robustness of the porous network structures. Taking advantage of chemical bonding design, herein a black phosphorus (BP)@MXene compact film of 3D porous network structure is successfully made by in situ growth of BP nanoparticles on crumbled MXene flakes. The strong interfacial interaction (Ti−O−P bonds) formed at the BP− MXene interfaces not only enhances the atomic charge polarization in the BP−MXene heterostructures, leading to efficient interfacial electron transport, but also stabilizes the 3D porous yet dense architecture with much improved mechanical robustness. Consequently, fully packaged SCs using the BP@MXene composite films with a practical-level of mass loading (∼15 mg cm −2 ) deliver a high stack volumetric energy density of 72.6 Wh L −1 , approaching those of lead-acid batteries (50−90 Wh L −1 ), together with a long-term stability (90.58% capacitance retention after 50000 cycles). The achievement of such high energy density bridges the gap between traditional batteries and SCs and represents a timely breakthrough in designing compact electrodes toward commercial-level capacitive energy storage.
Two-dimensional (2D) crystalline carbon nitrides (CxNy) with graphene-like atomic structures but semiconducting nature are new appealing materials, and increasing interest has been garnered on their synthesis, properties, and applications. Apart...
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