Study On The Preparation Of Iron-based Oxygen (phosphorus) Compounds By Phthalocyanine Pyrolysis And Its Electrocatalytic Water Decomposition

In this paper,three unsubstituted iron-series metal phthalocyanines?MPc?,vizcobalt?II?phthalocyanine?CoPc?,iron?III?phthalocyanine?FePc?and nickel?II?phthalocyanine,were synthesized by template-reaction method at the present of 1,8-diazabicyclo[5,4,0]undec-7-ene.Then iron-series metalphthalocyanine/reduced graphene oxide?MPc/RGO?and iron-series metalphthalocyanine/reducedcarbon paper oxide?MPc/RCPO?were prepared via?-?stacking interactionbetween MPc and carbon material.The iron-series metal oxide nanosheens?M_xO_y NS?andiron-series metal oxide/reducedcarbon paper oxide?M_xO_y/RCPO?precursor were obtained by a simple pyrolysis after a calcination treatment?400oC?in air.Then the iron-series metal phosphide nanosheens?M_xP NS?and the iron-series metal phosphide?M_xP/RCPO?through low temperature phosphidation of isM_xO_y NS and M_xO_y/RCPO.The products were characterized by TGA,XRD,BET,Raman,XPS,SEM and TEM,respectively.Electrocatalytic water splitting cells were build with iron-series metal oxide?phosphide?catalysts,and their electrocatalytic water splitting activity were investigated.Both of the M_xO_y NS and M_xP NS exhibited a representative laminated nanosheets structure.The M_xO_y NS and M_xP NS as a non-noble-metal catalyst exhibits excellent electrocatalytic water splitting performance under alkaline conditions.Taking into account the practical application,The M_xP/RCPO electrodewe prepared exhibited excellent electrocatalytic water splitting performance under alkaline conditions.The cobalt oxide nanosheets?Co₃O₄ NS?had a small onset overpotential of 1.53 V,a low Tafel slope of 64.4 mV dec^-1 for OER.The cobalt phosphide nanosheets?CoP NS?has a small onset overpotential of-64 mV,a low Tafel slope of 123.9 mV dec^-1for HER.