Lee, Si Young Jung, Hyejin Chae, Sang Youn Oh, Hyung-Suk Min, Byoung Koun Hwang, Yun Jeong 2024-01-19T22:02:51Z 2024-01-19T22:02:51Z 2021-09-03 2018-08-10 0013-4686 https://pubs.kist.re.kr/handle/201004/121040 Water splitting is a clean and renewable way to produce hydrogen, and developing an efficient water oxidation electrocatalyst is crucial to overcome the slow kinetics and large overpotential of the oxygen evolution reaction (OER) in water electrolysis. In this work, we demonstrate that OER activity of an electrodeposited Ni catalyst can be influenced by a support material, and electron transfer between the Ni-based catalyst and the support is proposed to increase the oxidation states of Ni and thus contribute to enhancing its intrinsic OER activity. When a Ni catalyst layer is deposited using a carbon-based powder support instead of an expensive Au foil, the overpotential decreased by more than 50 mV at 10 mA/cm(2) due to the synergic effect of the increased surface area and the modified Ni electronic states. In addition, compared with carbon powder supports, Fe and N doped carbon (Fe-N-C) is found to provide particularly more efficient support for the Ni OER catalyst; however, according to electrochemical measurement results, there is no indication of additional Fe intercalation. X-ray photoelectron spectroscopy (XPS) analysis shows the highest binding energy of Ni particularly on the Fe-N-C, suggesting facile electron transfer from Ni to the Fe-N-C interface. (c) 2018 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD OXYGEN EVOLUTION REACTION LAYERED DOUBLE HYDROXIDE ELECTROCHEMICAL EVOLUTION NICKEL FOAM RAMAN-SPECTROSCOPY OXIDE CATALYSTS IRIDIUM OXIDE COBALT OXIDE DOPED CARBON EFFICIENT Insight into water oxidation activity enhancement of Ni-based electrocatalysts interacting with modified carbon supports Article 10.1016/j.electacta.2018.05.170 1 ELECTROCHIMICA ACTA, v.281, pp.684 - 691 ELECTROCHIMICA ACTA 281 684 691 scie scopus 000439134600075 2-s2.0-85048581708 Electrochemistry Electrochemistry Article OXYGEN EVOLUTION REACTION LAYERED DOUBLE HYDROXIDE ELECTROCHEMICAL EVOLUTION NICKEL FOAM RAMAN-SPECTROSCOPY OXIDE CATALYSTS IRIDIUM OXIDE COBALT OXIDE DOPED CARBON EFFICIENT Water oxidation Nickel electrocatalyst Support Fe-N-C Electron transfer