Universität zu Köln

Park, Kyoung Ryeol, Jeon, Jaeeun, Choi, Heechae ORCID: 0000-0002-9390-6607, Lee, Junho, Lim, Dong-Ha ORCID: 0000-0003-4328-5168, Oh, Nuri ORCID: 0000-0001-9145-8911, Han, Hyuksu, Ahn, Chisung, Kim, Baejung and Mhin, Sungwook ORCID: 0000-0001-5515-8399 (2022). NiFe Layered Double Hydroxide Electrocatalysts for an Efficient Oxygen Evolution Reaction. ACS Appl. Energ. Mater., 5 (7). S. 8592 - 8601. WASHINGTON: AMER CHEMICAL SOC. ISSN 2574-0962

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Abstract

Alkaline electrolysis is one of the most promising among gas-to-power technologies to produce hydrogen energy where the oxygen evolution reaction (OER) plays an important role. It has recently been demonstrated that the OER activity of layered double hydroxide (LDH) could be enhanced by accommodating more abundant active sites that offer optimal binding energies between intermediates. Here, we report a study of nickel iron layered double hydroxides by varying the Ni:Fe atomic ratio of the Ni1-xFex-LDH to induce changes to their physiochemical properties through which the optimum OER performance is determined. Optimized NiFe-LDH-38 (Ni0.62Fe0.38LDH) shows an excellent OER performance in alkaline electrolyte, demonstrating a potential of 1.45 V (vs RHE) at 100 mA cm(-2), which outperforms the commercial RuO2 catalyst. Also, computational simulations support the OER performance of the single NiFe-LDH phase (NF-LDH-38). This work provides not only a fundamental understanding of the effect of the Ni:Fe atomic ratio of the Ni1-xFex-LDH on OER performance but also the design strategy of lowcost, earth abundant, and active electrocatalysts toward water oxidation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Park, Kyoung Ryeol UNSPECIFIED UNSPECIFIED UNSPECIFIED Jeon, Jaeeun UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Lee, Junho UNSPECIFIED UNSPECIFIED UNSPECIFIED Lim, Dong-Ha UNSPECIFIED orcid.org/0000-0003-4328-5168 UNSPECIFIED Oh, Nuri UNSPECIFIED orcid.org/0000-0001-9145-8911 UNSPECIFIED Han, Hyuksu UNSPECIFIED UNSPECIFIED UNSPECIFIED Ahn, Chisung UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Baejung UNSPECIFIED UNSPECIFIED UNSPECIFIED Mhin, Sungwook UNSPECIFIED orcid.org/0000-0001-5515-8399 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-684373
DOI:	10.1021/acsaem.2c01115
Journal or Publication Title:	ACS Appl. Energ. Mater.
Volume:	5
Number:	7
Page Range:	S. 8592 - 8601
Date:	2022
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2574-0962
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GENERALIZED GRADIENT APPROXIMATION; TOTAL-ENERGY CALCULATIONS; WATER; CATALYSTS Multiple languages Chemistry, Physical; Energy & Fuels; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68437