Cobalt-Modified Covalent Organic Framework as a Robust Water Oxidation Electrocatalyst
Cobalt-Modified Covalent Organic Framework as a Robust Water Oxidation Electrocatalyst
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DOI：
10.1021/acs.chemmater.6b01370
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发表时间：
2016-06-28
影响因子：
8.6
通讯作者：
Kurungot, Sreekumar
中科院分区：
文献类型：
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作者：
Aiyappa, Harshitha Barike;Thote, Jayshri;Kurungot, Sreekumar
由于析氧反应（OER）催化剂的动力学较差，因此开发能够氧化水的稳定、高效的析氧反应（OER）催化剂是将太阳能转化为电能的首要挑战之一。本文中，通过将活性Co（II）离子工程化到其多孔框架中，将含联吡啶的共价有机框架（TpBpy）用作OER催化剂。所获得的Co-TpBpy保持了高度可及的表面积（450 m2/g），具有优异的稳定性，即使在中性pH条件下在磷酸盐缓冲液中进行1000次循环和24 h的OER活性后，电流密度为1 mA/cm（2），过电位为400 mV。Co-TpBpy的不寻常的催化稳定性来自于固有的孔隙率和COF骨架中存在的配位单元的协同效应。
The development of stable, efficient oxygen evolution reaction (OER) catalyst capable of oxidizing water is one of the premier challenges in the conversion of solar energy to electrical energy, because of its poor kinetics. Herein, a bipyridine-containing covalent organic framework (TpBpy) is utilized as an OER catalyst by way of engineering active Co(II) ions into its porous framework. The as-obtained Co-TpBpy retains a highly accessible surface area (450 m(2)/g) with exceptional stability, even after 1000 cycles and 24 h of OER activity in phosphate buffer under neutral pH conditions with an overpotential of 400 mV at a current density of 1 mA/cm(2). The unusual catalytic stability of Co-TpBpy arises from the synergetic effect of the inherent porosity and presence of coordinating units in the COF skeleton.