Abstract
Recently, the issue of energy crisis were raised the attention of which looking for developing new, clean, efficient, and sustainable resources of renewable energy, as well as new technologies associated with energy conversion and storage. For this end, green energy applications for energy generation (DSSCs) and energy storage devices (Supercapacitors) have been promising candidates for the energy requirement. In the first part of this thesis, we developed the directly synthesis of carbon nanotubes (CNTs) on FTO glass at low temperature via the low pressure chemical vapor deposition (LPCVD) method. The specimens were further underwent an electrochemical deposition process to decorate layed-MoS2 nano-catalyst and construct a 3D hybrid nanostructure as counter electrode (C.E.) materials for DSSCs. The DSSC assembled with MoS2/CNTs C.E. exhibiting the photoconversion efficiency value of 7.83 %, which was 9.5 % higher than that of the Pt film. Our findings demonstrated that the MoS2/CNTs hybrid nanostructure is a promising candidate for application as a highly efficient and low-cost C.E. material in Pt-free DSSCs. In the second part, we fabricated the full-carbon hybrid nanoarchitecture of carbon nanofibers/3D graphene (CNFs/3DG), this directly growth of binder-free CNFs/3DG hybrid nanoarchitecture provides strong adhesion to the substrate, low internal resistance, and excellently vertical and horizontal electron transmission ability for electron collection for supercapacitors application. In the third part, we provide an economic strategy of facile transition process of carbon nanomaterials surface from hydrophobic to hydrophilic by Ethanol-treatment process. Moreover, the CV-acid treatment further improve the ELDC by actived meso-/micro-pore structure at the electrode/electrolyte interface and introduced the pseudocapacitance by decorated surface oxygen-containing groups. This method remarkably enhanced the capacitance, energy density, and could be a promising candidate in high-performance supercapacitor applications.