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Ultrathin metal-organic framework array for efficient electrocatalytic water splitting

zhpd55 添加于 2017/6/7 7:37:11  241次阅读 | 0次推荐 | 0个评论

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.

作 者:Jingjing Duan, Sheng Chen, Chuan Zhao
期刊名称: Nature Communications
期卷页: Published online: 05 June 2017 第8卷 第期 Article number: 15341 页
学科领域:化学科学 » 有机化学 » 金属有机化学
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原文链接:https://www.nature.com/articles/ncomms15341
DOI: 10.1038/ncomms15341
ISBN:
关键词: Electrocatalysis, Metal–organic frameworks
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备 注: UNSW Sydney chemists have invented a new, cheap catalyst for splitting water with an electrical current to efficiently produce clean hydrogen fuel. The technology is based on the creation of ultrathin slices of porous metal-organic complex materials coated onto a foam electrode, which the researchers have unexpectedly shown is highly conductive of electricity and active for splitting water. "Splitting water usually requires two different catalysts, but our catalyst can drive both of the reactions required to separate water into its two constituents, oxygen and hydrogen," says study leader Associate Professor Chuan Zhao. "Our fabrication method is simple and universal, so we can adapt it to produce ultrathin nanosheet arrays of a variety of these materials, called metal-organic frameworks. "Compared to other water-splitting electro-catalysts reported to date, our catalyst is also among the most efficient," he says. The UNSW research by Zhao, Dr Sheng Chen and Dr Jingjing Duan is published in the journal Nature Communications.
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