Studies On The Syntheses And Electrochemical Performances Of Metal Sulfides Nanostructures

Sustainable and clean energy sources have captured considerable research efforts to deal with the ever-increasing energy depletion and environmental pollution.Hydrogen energy has been considered as the most promising clean and renewable energy source considering the fossil fuel exhaustion and environmental pollution.Electrochemical water splitting is one of the effective solutions for sustainable hydrogen production,which consists of cathodic hydrogen evolution reaction（HER）and anodic oxygen evolution reaction（OER）..In this thesis,based on the transition metal sulfide,we mainly focus on the desining and assembling transition metal sulfide nanostructures through template method,and then investigating their electrochemical catalysis behavious.The main research and results are summaried as following:1)we report,for the first time,the successful synthesis of hierarchical MoCoS₃nanotubes constructed of 2D ultrathin nanosheet subunits,using a self-sacrifice templatemethod that starts from CoMoO₄ nanorods.We believe that the present synthesis method may pave a way to the fabrication of hollow and/or hierarchical metal sulfide-based architecture using nanostructured metal oxides as precursors for energy conversion and storage applications.2)we first demonstrate the synthesis of NiMoS₃ nanorods via a hydrothermal method with NiMoO₄ nanorods as a self-template.Guaranteed by the synergistic effect of Ni-Mo-S and the structural advantages,NiMoS₃ nanorods are endowed with advantages to function as the efficient and stable catalysts for electrochemical HER in acidic solution and alkaline media.3)The transition metals of Co and Ni are selected as active centers for the synthesis of Prussian blue analogues as novel electrocatalysts for OER,including Co₃[Fe（CN）₆]₂（Co PB）and Ni₃[Fe（CN）₆]₂（Ni-PB）nanocubes.Our present catalyst synthesis strategy can be extended to prepare hybrid catalysts of Pt or other noble metals with MOFs for applications in sustainable energy storage and conversion systems.