Study on the Electrochemical Oxidation Performance of MOF-derived Pyrite Nano-electrocatalysts
The large-scale use of electrolytic water as an energy conversion technique is contingent upon the carefully managed production of non-precious metal electrocatalysts that are affordable,effective and long-lasting.MIL-101(Fe)was synthesized via a hydrothermal method and employed as a precursor for the production of iron carbon-based metal-organic frameworks(MOFs)through pyrolysis.This iron carbon compound was further transformed into a nano pyrite-type catalyst(MIL-101(Fe)-D-FeS2)through in-situ sulfurization reduction.The sample was characterized through X-ray diffraction(XRD),field-emission scanning electron microscopy(SEM)and high-resolution X-ray photoelectron spectroscopy(XPS).The analysis revealed uniform distribution of FeS2 nanospheres on the octahedral carbon framework derived from the precursor.Cyclic voltammetry(CV)and linear sweep voltammetry(LSV)were utilized to assess the reversibility and activity of MIL-101(Fe)-D-FeS2 in electrochemical reactions.The overpotentials of the material at current densities of 10 mA/cm2 and 100 mA/cm2 were measured at 260 mV and 307 mV,respectively.Notably,the double-layer capacitance was determined to be 3.82 mF/cm2,with a Tafel slope of 48.4 mV/dec.When compared to commercial pyrite powder and the conventional commercial e-lectrode RuO2,the novel catalyst demonstrated better performance metrics.Furthermore,long-term stability is preserved in MIL-101(Fe)-D-FeS2 at high current densities.The combination of MOFs and FeS2 material,which raises the catalyst active site's exposure and enhances the catalyst's overall activity and conductivity,is responsible for this remarkable activity.The findings demonstrate that a novel strategy for the synthesis and investigation of electrocatalysts is provided by the creation of the MIL-101(Fe)-D-FeS2 catalyst.
pyriteMOFsoxygen evolution reactionelectrolysis of waterelectro-catalysis
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