Synthesis And Electrochemical Performance Of Low-dimensional Nanocomposites

Low-dimensional carbon nanoparticles and their composites have become a research hotspot for the design and synthesis of electrocatalytic materials due to their excellent electron conduction and ionic mobility,large specific surface area and chemical stability.In this paper,low-dimensional carbon nanocomposites such as zero-dimensional metal nanoparticles,one-dimensional carbon nanofibers and carbon nanotubes,and two-dimensional nanosheets were synthesized on the basis of electrospinning and guanosine supramolecular gels by different synthetic strategies.Their electrocatalytic performance for hydrogen evolution(HER),oxygen evolution(OER)and oxygen reduction(ORR)reactions was investigated.Their main contents are as follows:(1)A new Co P/CNFs bifunctional catalyst was successfully developed by in situ growth of two-dimensional Co(OH)₂ nanosheets on one-dimensional CNFs substrates obtained by electrostatic spinning and high-temperature carbonization,and after low-temperature oxidation and phosphorylation,its electrochemical properties were tested and its all-decomposed water composite electrocatalytic performance was effectively evaluated.(2)A unique synthetic strategy was developed to obtain B,N-doped carbon nanotubes(Ni Fe/B,N-CNT)loaded with Ni Fe alloy nanoparticles by simple supramolecular gel(GSMG)nanofiber self-template transformation,and the structure of the gel-derived catalyst was controllably transformed from metal-constrained carbon nanofibers(M/CNF)to hollow metal-constrained carbon nanotubes(M/CNT).Based on the synergistic effect of the highly active Ni Fe alloy and hollow CNT,Ni Fe/B,N-CNT exhibited high oxygen electrocatalytic activity.(3)An efficient bifunctional electrocatalyst consisting of Ni Fe alloy nanoparticles embedded with B,N-doped carbon nanofibers(Ni Fe/B,N-CNFs)was prepared by a unique self-template transformation design and synthesis of guanosine-based supramolecular hydrogels.The supramolecular gel-derived CNFs became a uniformly distributed substrate for the Ni Fe alloy nanoparticles,resulting in materials with excellent ORR and OER.