The Investigation Towards Electrochemical Performance Of Transition Metal-based Nano Materials Derived From CoFE-PBA

Prussian blue analogy is a kind of organic polymer compound that was reported in early age.The simply synthesis,large surface area,as well as the diversity of pore size,endow PBA with the widespread application in the field of electrochemical oxygen revolution reaction,Na-ion battery and gas storage.However,the natural shortage of inferior conductivity and low density of active sites limit their performance.Hence,based on the template of PBA and different dispose approach,we have obtained various materials,which exhibit superior catalytic activities in the present work.?1?We propose a facile strategy for synthesis of oxygen-incorporated amorphous Co S_x porous nanocubes(A-CoS_4.6O_0.6 PNCs),which was implemented by ionic exchange reaction on Prussian Blue Analogue?PBA?with S_2-replacing Fe?CN?₆^3-.The anionic exchange reaction endows the A-CoS_4.6O_0.6 PNCs with porous structure consisting of a large amount of defect sites.Moreover,the A-CoS_4.6O_0.6 PNCs tend to generate more active Co-S dangling bond with introducing oxygen into hosts,dramatically strengthening the O* adsorption that can promote water oxidation reaction with low overpotential and high activity.Specifically,A-CoS_4.6O_0.6 PNCs exhibit a polarization current density of 4.59 m A cm^-1 at 1.8 V in neutral solution and offer a current density of 10 m A cm^-2 at a potential of 1.52 V,which are superior to RuO₂.?2?Fe Co alloy nanoparticles embedded in nitrogen-doped carbon are synthesized through a simple thermal decomposition of Co-Fe Prussian Blue Analogue?Co Fe-PBA?in Ar atmosphere,during which the organic ligand of CN-in Co Fe-PBA provides both carbon and nitrogen sources for forming nitrogen-doped carbon and Fe Co alloy nanoparticles,and thus producing a core-shell structure?FeCo@NC?.According to a set of electrochemical tests,the obtained Fe Co@NC can function as a Janus to drive OER and ORR with desirable activities and stabilities in alkaline media.Specifically,the Fe Co@NC presents an onset-potential of 1.45 V,a potential of 1.49 V at 10 m A cm^-2,a Tafel slope of 62 m V de^-1 as OER catalyst,and an onset potential of 0.94 V,a halfwave potential of 0.8 V as ORR catalyst.The performance is comparable to those of precious metal based electrocatalysts,making it possible for potential application in the renewable energy devices,especially Zn-air battery.