Combinatorial high-throughput optical screening for optimum composition of highly active ruthenium based ternary catalysts in oxygen reduction reaction. (21st September 2015)

• Record Type: Journal Article
• Authors: Koh, Jaekang; Park, Sung Hyeon; Kim, Hyeon Woo; Kim, Yegeun; Kang, Junha; Park, Juseong; Woo, Seong Ihl
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 35(2015)
• Page Start: 11615
• Page End: 11624
• Publication Date: 2015-09-21
• Subjects: Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.03.037
• Languages: English
• ISSNs: 0360-3199

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">A series of combinatorial optical screening analysis was operated, first for the selection of metal candidates for the ternary Ru-based catalyst and later for the selection of optimized compositions with high performance towards ORR. Among the binary Ru-based catalysts, combinations with Co and Se exhibited the highest performance towards ORR. To investigate a possible synergic effect from the selected metals, the ternary Ru-based combinatorial optical screening was preceded. Among the various combinations and compositions, the optimum composition towards ORR for ternary Ru–Se–Co based catalyst was chosen at 73:12:15 = Ru:Se:Co at. % (named RSC-1). The RSC-1 catalyst measured a current density of −1.28 mAcm⁻² at 0.75 V (<italic>vs</italic>. RHE), which was about 5 times higher than that of Ru/C (−0.26 mA cm⁻²). The mass activity of RSC-1 (12.20 mA mg⁻¹) had an enhanced performance of about 6.8 times than that of Ru/C (1.78 mA mg⁻¹) at 0.75 V (<italic>vs</italic>. RHE). It was deduced that a synergic effect between the repulsion of oxy-species on the Ru atoms by Se and the alternation of electron configuration by Co, the adequate amounts of Co and Se in the ternary Ru–Se–Co based catalyst could have induced the enhanced ORR performance of the RSC-1 catalyst.</p> </sec> </abstract>