The Application Of Organometallic Framework-derived Porous Materials In Electroanalysis

Recently,due to the diversified morphologies and tunable structure,MOFs have received great attention in many fields.Meanwhile,MOF-derived nanomaterials have become research hotspot in functional materials owing to their unique properties.Through the selection of metal nodes and organic ligands,we can prepare various MOFs derivatives,such as heteroatom doped porous carbons,metal/carbon composites and so on.Therefore,the preparation of MOF-derived nanomaterials is significant for developing electrochemical sensing with large specific surface area,high catalytic activity and conductivity.The main contents of this paper are as follows:We proposed a method to synthesize N-doped porous carbon?Z-1000?with high graphitization by ZIF-8.In argon,Z-1000 was obtained by catalytic pyrolyzing ZIF-8under 1000?.Due to the orderly arrangement of imidazolyl ligands in ZIF-8,nitrogen was evenly doped in Z-1000,which greatly improves the electrochemical performance.In addition,the ordered porous structure with high graphitization promotes the electron transfer and plays the role of molecular sieve.It is important to improve the conductivity and selectivity of detection platform.For the detection of various biomolecules,Z-1000has shown an ideal electrochemical performance as detection platform.We proposed a method of preparing N-doped carbon nanomaterials by using MOFs with rich imidazolium as precursor.Firstly,we prepared high N-doped porous carbon?NC-800?through carbonization of N-MOF.Then,solvent exfoliation was used to improve the conductivity and electrochemical activity of NC-800 and ENC-800 was obtained.On the one hand,the organic ligands of N-MOF make ENC-800 possess massive C-N active sites.On the other hand,solvent exfoliation increases the specific surface area and active sites of ENC-800.Therefore,ENC-800 electrochemical sensor has shown high catalytic activity and specificity for the detection of chloramphenicol.We proposed a method of in situ growing transition metal phosphide on graphene?Ni₂P/G?with MOF-74 as precursor.Owing to the substantial existence of open metal sites of MOF-74,MOF-74 is an ideal precursor to synthesize uniform Ni₂P nanoparticles.In addition,the introduction of graphene makes the material possess high electrocatalytic and stability.In the alkaline environment,the Ni₂P/G glucose sensor has shown excellent electrochemical performance for glucose.