High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode
SCIE
SCOPUS
- Title
- High‐Efficiency Anion‐Exchange Membrane Water Electrolyzer Enabled by Ternary Layered Double Hydroxide Anode
- Authors
- Lee, Jooyoung; JUNG, HYEONJUNG; Park, Yoo Sei; Woo, Seongwon; Yang, Juchan; Jang, Myeong Je; Jeong, Jaehoon; Kwon, Nayoung; Lim, Byungkwon; Han, Jeong Woo; Choi, Sung Mook
- Date Issued
- 2021-07
- Publisher
- Wiley - V C H Verlag GmbbH & Co.
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/107547
- DOI
- 10.1002/smll.202100639
- ISSN
- 1613-6810
- Article Type
- Article
- Citation
- Small, vol. 17, no. 28, page. 2100639, 2021-07
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