The oxygen reduction activity of Ru/C and RuSey/C electrocatalyst in the presence of phosphoric acid
- The oxygen reduction activity of Ru/C and RuSey/C electrocatalyst in the presence of phosphoric acid
- 장종현; 박희영; 유성종; 이국승; 함형철; 김수길; 황승준; 김형준; 조은애; 헨켄스마이어디억; 남석우; 임태훈
- PEMFC; catalyst; non-platinum; high temperature; PBI; Se-modified-Ru catalyst; Oxygen reduction reaction; Phosphoric acid
- Issue Date
- 10th Japan-Korea Symposium on Materials & Interface
- The high temperature polymer electrolyte membrane fuel cells (HT-PEMFC), which is operated between 120 and 180oC, have higher volume and cost efficiency compared to conventional PEMFCs, because water management and fuel processing can be simplified. In addition, catalytic activities are also expected to be enhanced at higher temperature, resulting in large decrease in platinum loading. However, when phosphoric acid-doped polybenzimidazole (PBI) membranes are utilized as polymer electrolyte membranes, with phosphoric acid doping, the platinum surface is strongly adsorbed by phosphate ions and catalytic activity becomes very low [1-2].
As a non-platinum electrocatalyst, carbon-supported Se-modified-Ru catalysts (RuSey/C) were synthesized. The ORR activity of an unmodified Ru/C catalyst decreased by 26.8% with phosphoric acid addition, but the activity of the Se-modified Ru catalysts (RuSey/C) was enhanced by 63.8% (RuSe1.56/C). In-situ X-ray absorption spectroscopy (XAS) analyses were carried out at 600 mV and changes in the oxidation states and metal-oxygen interaction were analysed to provide possible mechanism of activity enhancement with phosphoric acid addition.
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