掺氮石墨烯/富碳氮化碳/掺氮石墨烯量子点多功能光助电催化剂的制备及其性能研究

istinctive electronegativity and similar atomic radius for elements of C and N afford their allotropic substances composed of these two elements with excellent photo- and electro- chemical performance for energy conversion. To explore the synergism of allotropic substances, carbon-rich C3N4 (CCN) is in-situ hydrothermally synthesized with the N-doped graphene (NG) grown by chemical vapor deposition (CVD) as the template to prepare the NG/CCN composite. Then, nitrogen-doped graphene quantum dots (N-GQDs), another material containing C and N elements, was combined with NG/CCN via in-situ hydrothermal method to synthesize NG/CCN/N-GQDs. Compared to the NG and CCN, NG/CCN/N-GQDs composite exhibits the remarkable enhancement of catalytic activities toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Particularly, visible light irradiation can significantly improve the catalytic performance of NG/CCN/N-GQDs toward the above three reactions. The results concluded from the Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and UV-visible absorption spectroscopy (UV-vis) confirm the successful preparation of NG/CCN/ N-GQDs composites, and it exhibits the improved light-harvesting ability, effective separation of electron-hole pairs, and interfacial charge transfer as compared to the NG, CCN and N-GQDs, beneficial to photo-promoted electrochemical catalysis. In summary, our elucidation on the synergism between NG, CCN, and N-GQDs facilitates to pave their promising applications in microelectronic devices, dual-photoelectric fuel cells, wearable devices, photoelectrochemical batteries, sensors and other fields.