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2023 Vol.33, Issue 10

Research Paper

MOF-Derived FeCo-Based Layered Double Hydroxides for Oxygen Evolution Reaction
Fang Zheng1
,
Mayur A. Gaikwad1
,
Jin Hyeok Kim1†
1Optoelectronics Convergence Research Center and Department of Materials Science and Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
†Corresponding author E-Mail : jinhyeok@chonnam.ac.kr (J. H. Kim, Chonnam Nat’l Univ.)
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
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