Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 800, Issue -, Pages 450-455Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.047
Keywords
CeO2; Co(OH)(2); Hybrid catalyst; Oxygen evolution reaction; Hydrogen evolution reaction
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT, South Korea [2016M3A7B4909318]
- R&D Center for Valuable Recycling (Global-Top R&BD Program) of the Ministry of Environment, South Korea [R2-17_2016002250005]
- Korea University Grant, South Korea
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Hybrid catalyst has been intensively studied over the past decades due to its advantages in many applications. It has been shown that CeO2 nanoplates with an average diameter of 18.6 nm have uniform contact with Co(OH)(2). The objective of the present study was to comprehensively investigate CeO2/Co(OH)(2) hybrid catalysts using various structural and electrochemical analysis to understand the synergetic effect between CeO2 and Co(OH)(2) beneficial interaction on oxygen evolution and hydrogen evolution reaction (OER and HER) characteristics. OER/HER results showed excellent catalytic activity of CeO2/Co(OH)(2) hybrid catalysts with an overpotential of 410 (OER) and 317 mV (HER) compared to pure CeO2 nanoplates and Co(OH)(2) powder. Corresponding Tafel slopes of CeO2/Co(OH)(2) hybrid catalysts for OER and HER were 66 and 140 mV dec(-1), respectively, lower than those of evaluated CeO2 nanoplates and Co(OH)(2) powder. Compared to bare CeO2 nanoplates and Co(OH)(2), CeO2/Co(OH)(2) hybrid catalysts exhibited remarkably enhanced electrocatalytic activity for OER and HER. (C) 2019 Elsevier B.V. All rights reserved.
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