Fe_(2)N纳米颗粒的制备及其电催化性能的研究

Preparation and Electrocatalytic Properties of Fe_(2)N Nanoparticle Catalysts

以尿素、FeCl_(3)和NaCl混合物为原材料,无水乙醇作为溶剂,经过干燥后采用一锅合成法制备了高性能的氧气还原反应(ORR)催化剂Fe_(2)N@g-C_(3)N_(4)。通过TEM测试,Fe_(2)N纳米颗粒被封装在g-C_(3)N_(4)纳米管中,这种结构保护了活性颗粒,提升了材料的稳定性。通过计时电流法测试,电化学活性在60000 s模拟反应后仅衰减3%。ORR动力学分析表明,催化剂在高电位下的Tafel斜率为80 mV·dec^(-1),在低电位下为125 mV·dec^(-1),与市售参考催化剂的数值非常接近,表明它们的反应机理相似。

A high performance oxygen reduction reaction(ORR)catalyst Fe_(2)N@g-C_(3)N_(4)was prepared by one pot synthesis method,using urea,FeCl_(3)and NaCl mixture as raw materials,anhydrous ethanol as solvent.The structure,morphology and electrocatalytic properties of the catalyst materials were studied.Through TEM test,Fe_(2)N nanoparticles were encapsulated in g-C_(3)N_(4)nanotubes.The active particles was protected from corrosion and the stability of the material was improved.Through the chronoamperometric test,the electrochemistry property showed only 3%attenuation after 60000 s of simulated reaction process.The onset potential was up to 0.89 V,which was 10 mV negative shift compared to the commercial Pt/C catalyst.The Tafel slope of the catalyst was 80 mV·dec^(-1)at high potential and 125 mV·dec^(-1)at low potential,which was very close to the value of commercial reference catalyst,indicating their similar reaction mechanism.