Exfoliation of layered double hydroxides for enhanced oxygen evolution catalysis
Exfoliation of layered double hydroxides for enhanced oxygen evolution catalysis
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DOI：
10.1038/ncomms5477
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发表时间：
2014-07-01
影响因子：
16.6
通讯作者：
Hu, Xile
中科院分区：
文献类型：
--
作者：
Song, Fang;Hu, Xile
析氧反应是水裂解的关键反应。开发析氧催化剂的常用方法是寻找具有新的和优化的化学组成和结构的催化材料。在这里，我们报告了一个正交的方法来提高催化剂的活性，而不改变其组成或结构。具体地，应用液相剥离以增强层状双氢氧化物的析氧活性。剥离的单层纳米片表现出显着更高的析氧活性比相应的散装层状双氢氧化物在碱性条件下。镍铁和镍钴层状双氢氧化物的纳米片在活性和稳定性方面都优于商业二氧化铱催化剂。剥离产生更多的活性位点并提高电子传导性。这项工作证明了单层双氢氧化物对析氧反应具有良好的催化活性。
The oxygen evolution reaction is a key reaction in water splitting. The common approach in the development of oxygen evolution catalysts is to search for catalytic materials with new and optimized chemical compositions and structures. Here we report an orthogonal approach to improve the activity of catalysts without alternating their compositions or structures. Specifically, liquid phase exfoliation is applied to enhance the oxygen evolution activity of layered double hydroxides. The exfoliated single-layer nanosheets exhibit significantly higher oxygen evolution activity than the corresponding bulk layered double hydroxides in alkaline conditions. The nanosheets from nickel iron and nickel cobalt layered double hydroxides outperform a commercial iridium dioxide catalyst in both activity and stability. The exfoliation creates more active sites and improves the electronic conductivity. This work demonstrates the promising catalytic activity of single-layered double hydroxides for the oxygen evolution reaction.