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| Type |
Poster Presentation |
| Area |
Electrochemistry |
| Room No. |
Exhibition Hall 2 |
| Time |
4월 18일 (목요일) 11:00~12:30 |
| Code |
ELEC.P-453 |
| Subject |
Unraveling Synergetic and Antagonistic Effects in the Rational Design of Ni- and Ru-Based Water Splitting Electrocatalysts |
| Authors |
Filipe Marques Mota, Dong Ha Kim*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
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| Abstract |
Tuning the bifunctional fingerprints of the hydrogen and oxygen evolution reactions (HER and OER) of water splitting electrocatalysts through the rational design of hybrid architectures incorporating multiple phases with precise functionalities is of increasing attention. Herein, Ni- and Ru-based electrocatalysts with increasing Ni/Ru content ratios were designed through a one-step heat treatment at 250°C of synthesized ruthenate nanosheets, and NiCl2.6H2O and NaH2PO2.H2O precursors, under argon flow. A favored interaction between Ni ions and the negatively charged ruthenate surface directed an optimized in-situ growth of Ni2P moieties with size below 5 nm. XPS measurements confirmed, however, that these narrow moieties were swiftly oxidized to NiO, whereas larger Ni-based agglomerates at higher Ni/Ru ratios were less prone to oxidation. This size-dependent propensity of Ni2P moieties toward oxidation is reported here for the first time. Most importantly, at Ni/Ru=0.36 the incorporated NiO favored a superior OER performance with a 1.7-fold activity enhancement at limiting current densities. An antagonistic effect in the HER performance of these hybrid materials was, nonetheless, simultaneously observed and ascribed to the gradual incorporation of these oxide species on the surface of the Ru-based support. Our results reflect the difficulty in the integration of multiple phases during the synthesis procedure and the effect of an interaction between both materials on the resulting catalytic behavior. |
| E-mail |
filipemarques.m@gmail.com |
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123rd General Meeting of the KCS