可控生长石墨炔/氢氧化钴异质界面用于高效产氯

Controlled growth of a graphdiyne/cobalt hydroxide heterointerface for efficient chlorine production

  • 摘要: 氯碱工艺广泛应用于各种工业生产过程,在化工生产中起着关键和不可替代的作用。然而,目前所报道的析氯反应(CER)的电催化剂反应选择性和催化效率较低,显著限制了其实际应用。本文报道了在炭布基底表面生长氢氧化钴,随后再在其表面原位生长石墨炔(GDY/Co(OH)2)来可控制备高性能CER电催化剂的简单方法。在酸性模拟海水中,GDY/Co(OH)2在10 mA cm−2电流密度时的过电位仅为83 mV,最大法拉第效率(FE)为91.54%,氯产率高达157.11 mg h−1 cm−2。实验结果表明,GDY在Co(OH)2表面原位生长形成了GDY与金属Co原子之间具有强电子转移的界面结构,从而获得更高的导电性、更大的活性比表面积和更多的活性位点,进而提高了整体电催化的选择性和效率。

     

    Abstract: The chlor-alkali process plays a key and irreplaceable role in the chemical industry because of its use in various industrial processes. However, the low selectivity and efficiency of the reported chlorine evolution reaction (CER) electrocatalysts obviously hinder its practical use. We report a simple method for the controlled growth of high-performance CER electrocatalysts by first growing cobalt hydroxide on the surface of carbon cloth, followed by the in-situ growth of graphdiyne (GDY/Co(OH)2). As expected, the as-synthesized catalyst has a small overpotential of only 83 mV at 10 mA cm2, a maximum Faradaic Efficiency (FE) of 91.54%, and a high chlorine yield of 157.11 mg h1 cm2 in acidic simulated seawater. Experimental results demonstrate that the in-situ growth of GDY on the Co(OH)2 surface leads to the formation of heterointerfaces with strong electron transfer between GDY and Co atoms, resulting in a higher conductivity, larger active specific surface area and more active sites, thereby improving the overall electrocatalytic selectivity and efficiency.

     

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