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 viaπ-πstacking 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.