Ultrathin metal-organic framework array for efficient electrocatalytic water splitting

Jingjing Duan, Sheng Chen () and Chuan Zhao ()
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Jingjing Duan: School of Chemistry, Faculty of Science, The University of New South Wales
Sheng Chen: School of Chemistry, Faculty of Science, The University of New South Wales
Chuan Zhao: School of Chemistry, Faculty of Science, The University of New South Wales

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Two-dimensional metal-organic frameworks represent a family of materials with attractive chemical and structural properties, which are usually prepared in the form of bulk powders. Here we show a generic approach to fabricate ultrathin nanosheet array of metal-organic frameworks on different substrates through a dissolution–crystallization mechanism. These materials exhibit intriguing properties for electrocatalysis including highly exposed active molecular metal sites owning to ultra-small thickness of nanosheets, improved electrical conductivity and a combination of hierarchical porosity. We fabricate a nickel-iron-based metal-organic framework array, which demonstrates superior electrocatalytic performance towards oxygen evolution reaction with a small overpotential of 240 mV at 10 mA cm−2, and robust operation for 20,000 s with no detectable activity decay. Remarkably, the turnover frequency of the electrode is 3.8 s−1 at an overpotential of 400 mV. We further demonstrate the promise of these electrodes for other important catalytic reactions including hydrogen evolution reaction and overall water splitting.

Date: 2017
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DOI: 10.1038/ncomms15341

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