4.8 Article

High-Efficiency Anion-Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode

期刊

SMALL
卷 17, 期 28, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202100639

关键词

anion exchange membrane water electrolyzers; electrocatalysts; oxygen evolution reaction; transition metals

资金

  1. Hydrogen Energy Innovation Technology Development Program though the National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019M3E6A106367512, 2019M3E6A1064913]
  2. National Research Foundation of Korea [2019M3E6A1064913, 4199990514093] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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By corroding a conventional Ni foam electrode in the presence of Fe3+ and V3+ cations, it can be transformed into a high-performance oxygen-evolving electrode, achieving superior OER activity with the help of the unique structure and presence of vanadium in the NiFeV LDH electrode.
Developing high-efficiency and low-cost oxygen-evolving electrodes in anion exchange membrane (AEM) water electrolysis technology is one of the major challenges. Herein, it is demonstrated that the surface corrosion of a conventional Ni foam electrode in the presence of Fe3+ and V3+ cations can transform it into an electrode with a high catalytic performance for oxygen evolution reaction (OER). The corroded electrode consists of a ternary NiFeV layered double hydroxide (LDH) nanosheet array supported on the Ni foam surface. This NiFeV LDH electrode achieves an OER current density of 100 mA cm(-2) at an overpotential of 272 mV in 1 m KOH, outperforming the IrO2 catalyst by 180 mV. Density functional theory calculations reveal that the unique structure and the presence of vanadium in NiFeV LDH play a key role in achieving improved OER activity. When coupled with a commercial Pt/C cathode catalyst, the resulting AEM water electrolyzer achieves a cell current density as high as 2.1 A cm(-2) at a voltage of only 1.8 V-cell in 1 m KOH, which is similar to the performance of the proton exchange membrane water electrolyzer obtained from the IrO2 and Pt/C catalysts pair.

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