Evaluation of the influence of using reduced graphene oxide (RGO) on improvement of Cu-MOF performance as electrocatalyst for oxygen reduction reaction in fuel cells

Subject Areas :

mehdi mehrpouya ¹ , seyed ali mousavi ²

1 - دانشیار، دانشکده علوم و فنون نوین، دانشگاه تهران، تهران، ایران
2 - دانشجوی دکتری مهندسی سیستم‌های انرژی، دانشکده علوم و فنون نوین، دانشگاه تهران، تهران، ایران

Received: 2019-11-12 Accepted : 2020-10-08 Published : 2021-05-22

Keywords: fuel cell, Metal Organic Framework, Oxygen Reduction Reaction, Electrocatalyst, Non- metallic base,

Abstract :

The main target of this investigation is to synthesis and introduce several non-metallic electro catalysts with desirable performance and suitable price, for oxygen reduction reaction at cathode side. For this purpose, five electrocatalysts including graphene oxide (GO), nitrogen and sulfur doped graphene oxide (NS-RGO), copper metal organic framework (Cu-MOF), 6% GO-Cu-MOF, and 8% NS-RGO-Cu-MOF are synthesized by hydrothermal method. In continue, in order to investigate the structure, activity, and performance of synthesized electro catalysts, physical and electrochemical tests are employed, and obtained results are compared to the commercial 20% Pt/C. According to the physical tests outcomes, the structure of the synthesized electrocatalysts is uniform, and the layering is correctly performed.  As well as, it was found that the size of electrocatalysts is in the range of nanometer. Based on the electrochemical tests, amongst the synthesized electrocatalysts, 8% NS-RGO-Cu-MOF has the best chemical activity. The onset potential of this catalyst is obtained by -0.06 V vs Ag/AgCl. Also, the peak associated with oxygen reduction reaction is shown in -0.08 V, which the current density in this voltage is -4.8 mA/cm2. Besides, the electron transferred number (n) for 8% NS - RGO - Cu- MOF is computed with the value of 3.53, which it indicates the reaction occurred near to the 4 electron pathway. The onset potential of 6% GO-Cu-MOF is gained by -0.11 V vs Ag/AgCl.

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