121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-321
Subject An Effective Way to Improve the Electrocatalytic Activity of α-MnO₂ Nanowire by the Tuning of Chemical Bonding Nature
Authors Tae-Ha Gu, Xiaoyan Jin, Seong-Ju Hwang*
Center for Hybrid Interfacial Chemical Structure (CICS), Department of Chemistry and Nanoscience, Korea
Abstract The efficient manganese oxide-based electrocatalysts for oxygen reduction reaction (ORR) are synthesized by a simple one-pot hydrothermal method with the anchoring of selenate anion (SeO₄2-). The anchoring of highly oxidized selenate clusters on the surface of α-MnO₂ nanowire is quite effective in weakening of (Mn-O) bond with the lowering of Mn oxidation state. Since the resulting elongation of (Mn-O) bond distance facilitates the binding of reactant oxygen species for α-MnO₂, the anchoring of selenate cluster is advantageous in improving the ORR electrocatalytic activity of α-MnO₂. The excellent ORR activity of selenate-anchored α-MnO₂ is attributable to the improvement of charge transfer kinetics and the slight expansion of surface area upon the immobilization of selenate cluster. The present study underscores that the anchoring of highly oxidized cluster anion can provide quite efficient way of improving the electrocatalyst performance of manganese oxide.
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