Insight into water oxidation activity enhancement of Ni-based electrocatalysts interacting with modified carbon supports

Title
Insight into water oxidation activity enhancement of Ni-based electrocatalysts interacting with modified carbon supports
Authors
민병권황윤정오형석채상윤정혜진이시영
Keywords
electrocatalyst; OER; Ni; Charge transfer; support; modifiec cabon supports
Issue Date
2018-08
Publisher
Electrochimica acta
Citation
VOL 281-691
Abstract
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/cm2 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.
URI
http://pubs.kist.re.kr/handle/201004/67718
ISSN
0013-4686
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KIST Publication > Article
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