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Chloride-ion-directed synthesis of plate-like Cu2O mesocrystals for effective nitrogen fixation
Nanoscale ( IF 5.8 ) Pub Date : 2022-09-26 , DOI: 10.1039/d2nr04291f Jie Wang 1 , Fu Tang 1 , Junheng Gao 1 , Chuang Yao 2 , Sheng Zhang 1 , Lidong Li 1
Nanoscale ( IF 5.8 ) Pub Date : 2022-09-26 , DOI: 10.1039/d2nr04291f Jie Wang 1 , Fu Tang 1 , Junheng Gao 1 , Chuang Yao 2 , Sheng Zhang 1 , Lidong Li 1
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Cuprous oxide (Cu2O) mesocrystals, which are composed of numerous nanocrystals with a common crystallographic orientation, are supposed to possess superior photocatalytic abilities than the normal constructions, but very few of them have been reported to date. In this work, plate-like Cu2O mesocrystals were successfully fabricated via a facile one-pot wet chemical strategy. Unlike the commonly used polymers or small molecules, chloride ions (Cl−) were employed as structure-directing agents and played the main role in the Cu2O mesocrystal formation. The formation mechanism was interpreted as follows: the presence of Cl− inhibited the formation of CuO and Cu by forming the intermediate product CuCl, which was further hydrolyzed to Cu2O nanocrystals. Cl− tended to adsorb on the (111) facets of the formed Cu2O nanocrystals and stabilize them. Then the Cu2O nanocrystals were aligned side by side through the unabsorbed side faces, leading to mutual nanocrystals orientation and crystallographic lock-in, facilitating the formation of plate-like Cu2O mesocrystals. The polymer, polyacrylamide (PAM), also promoted the mesocrystals formation by serving as a stabilizer and fixed the crystallographic orientation of the Cu2O nanocrystals during their orderly stacking process. The plate-like Cu2O mesocrystals showed a long decay time and pronounced performance toward the visible-light-driven photocatalytic reduction of N2 into NH3. This research may stimulate in-depth investigations into the exploration of new synthetic methods for the design and construction of novel mesocrystals.
中文翻译：
氯离子导向合成片状Cu2O介晶用于有效固氮
氧化亚铜 (Cu 2 O) 介晶由许多具有共同晶体取向的纳米晶体组成，被认为比普通结构具有更好的光催化能力，但迄今为止报道的很少。在这项工作中，通过简单的一锅湿化学策略成功地制备了片状 Cu 2 O 介晶。与常用的聚合物或小分子不同，氯离子 (Cl - ) 被用作结构导向剂，并在 Cu 2 O 介晶形成中起主要作用。形成机制解释如下：Cl的存在-通过形成中间产物CuCl来抑制CuO和Cu的形成，CuCl进一步水解成Cu 2 O纳米晶体。Cl -倾向于吸附在形成的Cu 2 O纳米晶体的(111)面上并使它们稳定。然后Cu 2 O纳米晶体通过未吸收的侧面并排排列，导致相互纳米晶体取向和晶体锁定，促进板状Cu 2 O介晶的形成。聚合物聚丙烯酰胺 (PAM) 还通过充当稳定剂促进了介晶的形成，并在其有序堆叠过程中固定了 Cu 2 O 纳米晶体的晶体取向。片状Cu 2O介晶表现出较长的衰减时间和对可见光驱动的N 2光催化还原为NH 3的显着性能。这项研究可能会激发对探索新型介晶设计和构建的新合成方法的深入研究。
更新日期：2022-09-26
中文翻译：
氯离子导向合成片状Cu2O介晶用于有效固氮
氧化亚铜 (Cu 2 O) 介晶由许多具有共同晶体取向的纳米晶体组成，被认为比普通结构具有更好的光催化能力，但迄今为止报道的很少。在这项工作中，通过简单的一锅湿化学策略成功地制备了片状 Cu 2 O 介晶。与常用的聚合物或小分子不同，氯离子 (Cl - ) 被用作结构导向剂，并在 Cu 2 O 介晶形成中起主要作用。形成机制解释如下：Cl的存在-通过形成中间产物CuCl来抑制CuO和Cu的形成，CuCl进一步水解成Cu 2 O纳米晶体。Cl -倾向于吸附在形成的Cu 2 O纳米晶体的(111)面上并使它们稳定。然后Cu 2 O纳米晶体通过未吸收的侧面并排排列，导致相互纳米晶体取向和晶体锁定，促进板状Cu 2 O介晶的形成。聚合物聚丙烯酰胺 (PAM) 还通过充当稳定剂促进了介晶的形成，并在其有序堆叠过程中固定了 Cu 2 O 纳米晶体的晶体取向。片状Cu 2O介晶表现出较长的衰减时间和对可见光驱动的N 2光催化还原为NH 3的显着性能。这项研究可能会激发对探索新型介晶设计和构建的新合成方法的深入研究。
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