MXene quantum dots (QDs) are emerging 0D nanomaterials. Here, a new heterostructure is developed based on a 1D photoactive semiconductor and a 0D MXene QD for improved photocatalytic reduction of CO 2 into methanol. Specifically, Ti 3 C 2 QDs are incorporated onto Cu 2 O nanowires (NWs) through a simple self-assembly strategy. It is demonstrated that Ti 3 C 2 QDs not only significantly improve the stability of Cu 2 O NWs but also greatly improve their photocatatlytic performance by enhancing charge transfer, charge transport, carrier density, light adsorption, as well as by decreasing band bending edge and charge recombination. The energy level diagram derived from both experimental measurements and theoretical calculations provide further insights of such hierarchical photocatalysis system.

Ultrathin Co3S4/CoMo2S4 nanosheets vertically aligned on rGO sheets are prepared through a facile one-step hydrothermal method for supercapacitors.

Van der Waals heterojunctions (vdWHs) formed between 2D materials have attracted tremendous attention recently due to their extraordinary properties which cannot be offered by their individual components or other heterojunctions. Intriguing electronic coupling, lowered energy barrier, intimate charge transfer, efficient exciton separation occurring at the atomically sharp interface promise their applications in catalysis which, however, are largely unexplored. Herein, we demonstrate a 0D/2D vdWH between 0D graphene quantum dots (GQDs) and 2D pristine graphene sheets, simply prepared by ultrasonication of graphite powder using GQDs as intercalation surfactant. And such allcarbon Schottky-diode-like 0D/2D vdWH is employed for the emerging photoelectrochemical catalysis (water splitting) with high performance. The demonstrated low-cost and scalable bottom-up growth of heteroatom-doped GQDs shall greatly promote their widespread applications. Moreover, the mechanisms underlying GQD growth and heterojunction mediated catalysis are revealed both experimentally and theoretically.