Preparation Of Nanocomposite Materials And Research On Electrocatalysis

Functionalised porphyrins have attracted considerable attention owing to their ability to coordinate with numerous metal ions.Such porphyrins can afford stable complexes in the design of highly efficient catalytic materials with potential atomically dispersed active sites.We design and synthesize a novel composite system based on functionalized Pt(II)-porphyrin and multiwalled carbon nanotubes(Pt-TPP@MWCNTs)for hydrogen evolution reaction(HER)electrocatalysis.Rather than qualitatively integrating porphyrin with carbon nanotubes,the optimized Pt-TPP loading and precisely morphology control could be fine-tuned and quantitatively premeditated by using fluorescence and UV-vis titration based on the unique self-assembly behavior of the porphyrin for the first time.Compared with a commercial platinum-carbon catalyst,the as-prepared composites exhibit superior HER catalytic activity with an overpotential of 35m V versus a reversible hydrogen electrode for an electrocatalytic current density of j=-10 m A/cm~2 and a Tafel slope of32.3m V/dec.To our best knowledge,this is the best performanced HER catalyst among the porphyrin@carbon nanotube hybrids materials.Moreover,such catalysts do not exhibit observable activity decay after a 1000-cycle stability test,thus demonstrating their excellent durability.Additionally,to further reduce Pt loading to achieve cost efficiency,we develop a Pt-Co bimetallic HER catalyst with an ultra-low platinum content through a straight forward synthesis pathway with high catalytic activity and stability.This study provides a new approach for preparing a highly active and stable HER catalyst,which could potentially be extended to other reactions and catalysts and improve the utilization efficiency of precious metal catalysts for HER.