| Synthesis and electrochemical evaluation of a Ir-Ru binary oxide for the O2 evolution reaction in acidic media |
| کد مقاله : 1030-CNF (R1) |
| نویسندگان |
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هایده بلالی دهکردی *1، محمد ژیانی2، محمد محمدی2، پردیس نادراصلی3، مرضیه دریانورد1 1دانشگاه صنعتی اصفهان 2انجمن 3دانشگله صنعتی اصفهان |
| چکیده مقاله |
| Water electrolysis is an important method for hydrogen production. Safety, high energy density and low maintenance requirement are some advantages of water electrolyzers. However, despite the feasibility of using such systems, the slow kinetics of the OER in the anode is an issue which requires efficient electrocatalysts. In this way, development of highly active and durable oxygen-evolving elecrtcatalysts in acid media is a major challenge to design proton exchange membrane water electrolysis cell for producing pure hydrogen. For this purpose, many researchers have developed the OER reaction using materials such as oxides of transition metals such as Pd, Ir, Ru, Rh, Au, Re, Os, Ta, and Mo as electrocatalysts. It was observed that the use of these materials as electrocatalysts decreases the overpotential applied to carry out the OER, also generating a higher current density. This paper presents the preliminary results obtained from the synthesis and electrochemical half-cell characterization of IrO2, IrO2 and binary metal oxide of IrOx:RuOy 60:40 (catalytic activity and chemical stability) as electrocatalysts for the oxygen evolution reaction (OER). The catalysts were prepared by using modified Adams fusion method and compared with commercial IrO2 and commercial RuO2. Half-cell electrochemical evaluation was carried out in glassy carbon electrode (A=0.0314 cm2) substrate, Pt wire as counter electrode and a reference electrode Ag/AgCl in 0.5 M H2SO4. Cyclic, linear voltammetry and chronopotentiommetric were performed in order to characterize the electrochemical behavior of the material, its activity against the oxygen evolution reaction and stability respectively. Results show an onset potential 1.57 V, 1.54 V and 1.55 V vs. RHE and current density of 40 mA cm-2, 65 mA cm-2 and 60 mA cm-2 at 1.71 V vs. RHE for IrO2, RuO2 and IrOx:RuOy 60:40, respectively. The electrochemically active surface area values were obtained for the IrO2, RuO2 and IrOx:RuOy 60:40 samples equal to 81.96, 190.24 and 47.04 m2/gr, respectively. The present study demonstrates that IrOx:RuOy 60:40 electrocatalyst is an excellent catalyst for the oxygen evolution, because in addition to maintaining efficiency and activity, the process of oxygen evolution in the acid media can be more cost-effective. |
| کلیدواژه ها |
| Water electrolysis, Oxygen evolution reaction, Acidic media, Catalyst, Noble metal oxide |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |