Carbon doping can induce unique and interesting physical properties in hexagonal boron nitride (h‐BN). Typically, isolated carbon atoms are doped into h‐BN. Herein, however, the insertion of nanometer‐scale graphene quantum dots (GQDs) is demonstrated as whole units into h‐BN sheets to form h‐CBN. The h‐CBN is prepared by using GQDs as seed nucleations for the epitaxial growth of h‐BN along the edges of GQDs without the assistance of metal catalysts. The resulting h‐CBN sheets possess a uniform distrubution of GQDs in plane and a high porosity macroscopically. The h‐CBN tends to form in small triangular sheets which suggests an enhanced crystallinity compared to the h‐BN synthesized under the same conditions without GQDs. An enhanced ferromagnetism in the h‐CBN emerges due to the spin polarization and charge asymmetry resulting from the high density of CN and CB bonds at the boundary between the GQDs and the h‐BN domains. The saturation magnetic moment of h‐CBN reaches 0.033 emu g−1 at 300 K, which is three times that of as‐prepared single carbon‐doped h‐BN.
Schematic of the magnetic proximity effect in a van der Waals heterostructure formed by a graphene monolayer, induced by its interaction with a two-dimensional ferromagnet (CrBr3) for designing a single-gate field effect transistor.
Improved efficiency of N‐doped graphene in van der Waals heterostructure (vdW) for hydrogen evolution reaction (HER) can complement future hydrogen economy. The local electronic environment of layered graphene/MoS2 interface is significantly influenced by doping with foreign atoms. Moreover, electrochemical robust hydrogen evolution at basal planes of vdW heterostructure and the underneath atomic‐scale reaction mechanism is yet to be realised. We have investigated the mechanism of substitutional N‐doping and its catalytic efficiency towards HER process on the basis of density functional theory. By analysing the electronic structure, free‐energy diagrams, Volmer reaction paths and volcano plot analysis, it is inferred that nitrogen doping on graphene layer significantly modulate the hydrogen binding energies resulting in numerous orders of magnitude enhancement in HER activity. This study shows an optimal way to tune hydrogen binding on graphene/MoS2 heterostructure, an efficient electrocatalyst tending towards the value gained by platinum.
Schematic description of graphitic-C3N4@FeNi3 (pseudocapacitive FeNi3 and electrochemical double layer g-C3N4) heterostructure having energy density and quantum storage capacity for in-plane micro-supercapacitor application.
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