Cobalt-Modified Covalent Organic Framework as a Robust Water Oxidation Electrocatalyst,Chemistry of Materials

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Cobalt-Modified Covalent Organic Framework as a Robust Water Oxidation Electrocatalyst
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-06-13 00:00:00 , DOI: 10.1021/acs.chemmater.6b01370
Harshitha Barike Aiyappa _{1,

2} , Jayshri Thote ₁ , Digambar Balaji Shinde ₁ , Rahul Banerjee _{1,

2} , Sreekumar Kurungot _{1,

2}

Affiliation

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 m²/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/cm². 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.

中文翻译：

钴改性的共价有机骨架作为稳健的水氧化电催化剂

稳定，高效的能够氧化水的氧气释放反应（OER）催化剂的开发，由于其不良的动力学性能，是将太阳能转化为电能的主要挑战之一。本文中，通过将活性Co（II）离子工程化成其多孔骨架，将含联吡啶的共价有机骨架（TpBpy）用作OER催化剂。所获得的Co-TpBpy保持了高度可访问的表面积（450 m ² / g），具有出色的稳定性，即使在中性pH条件下在磷酸盐缓冲液中1000次循环和24小时的OER活性后，当前的过电势为400 mV密度为1 mA / cm ²。Co-TpBpy的异常催化稳定性来自固有孔隙率和COF骨架中存在配位单元的协同效应。

更新日期：2016-06-13

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