رويا پوررضا

Among transition metal nitrides, molybdenum nitride has a favorable activity in the hydrogen evolution reaction and is known as a superconducting material. Due to the various applications of this material, attention has been drawn to molybdenum nitride and the purpose of this research is to use an easy and practical method for the synthesis of molybdenum nitride, examine the synthesis parameters and try to improve the electrocatalytic performance of this material. undoped and copper doped molybdenum nitrides were synthesized by a low temperature pyrolysis method with using of ammonium molybdate and hexamine precursors at 750℃. Also, the effect of level of dopant, on the structure, phase, microstructure, changes in specific surface area and porosities and catalysis performance of the samples was investigated. Molybenum nitride's structure can be described as a face centered cubic array of Mo atoms with N atoms randomly occupying one half of the octahedral interstices of the host metal. Phase characterization of the samples were done by X-ray diffraction analysis. And this analyze, confirmed the formation of molybdenum nitride. The elements of samples were identified by EDS analysis . Bonding properties of the materials were eva‎luated With the help of infrared Fourier transform spectroscopy.The morphology was attained from the field emission scanning electron microscopy (FESEM). It was observed that the structure of undoped materials was block-like, and by dopping, the surface of the materials becomes puffy . The electrocatalytic performance of the samples were eva‎luated by linear sweep voltammetry, chronoamperometry and Nyquist curves. It was observed that, level of dopant had effect on surface area of samples. by increasing the dopant level, the specific surface area first increases and then decreases. The highest value of the specific surface area (78 m2⁄g ) was obtained for the sample with 0.5%wt cu. The electrocatalytic behavior of the synthesized molybdenum nitrides also showed that the sample with a higher specific surface area, had the best performance for the hydrogen evolution reaction and it's polarization resistance was the lowest value and is equal to 4Ω.

نيتريدموليبدن , گرماكافت , الكتروكاتاليزگر , واكنش آزادسازي هيدروژن

Molybdenum nitride , Pyrolysis , Electrocatalyst , hydrogen evolution reaction

Roya Poor Reza

Dr. Sarpoolaki