MOF-Derived FeCo-Based Layered Double Hydroxides for Oxygen Evolution Reaction

Fang Zheng; Mayur A. Gaikwad; Jin Hyeok Kim

doi:10.3740/MRSK.2023.33.10.377

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2023 Vol.33, Issue 10 Next Page

Research Paper

MOF-Derived FeCo-Based Layered Double Hydroxides for Oxygen Evolution Reaction

27 October 2023. pp. 377-384

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Abstract

Exploring earth-abundant, highly effective and stable electrocatalysts for electrochemical water splitting is urgent and essential to the development of hydrogen (H₂) energy technology. Iron-cobalt layered double hydroxide (FeCo-LDH) has been widely used as an electrocatalystfor OER due to its facile synthesis, tunable components, and low cost. However, LDH synthesized by the traditional hydrothermal method tends to easily agglomerate, resulting in an unstable structure that can change or dissolve in an alkaline solution. Therefore, studying the real active phase is highly significant in the design of electrochemical electrode materials. Here, metal-organic frameworks (MOFs) are used as template precursors to derive FeCo-LDH from different iron sources. Iron salts with different anions have a significant impact on the morphology and charge transfer properties of the resulting materials. FeCo-LDH synthesized from iron sulfate solution (FeCo-LDH-SO₄) exhibits a hybrid structure of nanosheets and nanowires, quite different from other electrocatalysts that were synthesized from iron chloride and iron nitrate solutions. The final FeCo-LDH-SO₄ had an overpotential of 247 mV with a low Tafel-slope of 60.6 mV dec^-1 at a current density of 10 mA cm^-2 and delivered a long-term stability of 40 h for the OER. This work provides an innovative and feasible strategy to construct efficient electrocatalysts.

Keywords

FeCo layered double hydroxide

metal-organic frameworks

oxygen evolution reaction

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :10
Pages :377-384
Received Date : 2023-07-16
Revised Date : 2023-09-19
Accepted Date : 2023-09-22
DOI :https://doi.org/10.3740/MRSK.2023.33.10.377

Korean Journal of Materials Research 한국재료학회지 ISSN:1225-0562(Print) 2287-7258(Online)

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