Mesostructured CeO2/g-C3N4 nanocomposites: Remarkably enhanced photocatalytic activity for CO2 reduction by mutual component activations
Mesostructured CeO2/g-C3N4 nanocomposites: Remarkably enhanced photocatalytic activity for CO2 reduction by mutual component activations
复制标题
介孔结构CeO2/g-C3N4纳米复合材料：通过相互组分激活显着增强光催化CO2还原活性
DOI：
10.1016/j.nanoen.2015.11.010
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发表时间：
2016-01-01
期刊：
影响因子：
17.6
通讯作者：
Shi, Jianlin
中科院分区：
文献类型：
--
作者：
Li, Mengli;Zhang, Lingxia;Shi, Jianlin
二氧化碳高度稳定，因此在室温下极难还原。本文采用硬模板法制备了介孔CeO2/石墨碳氮化物(m-CeO2/g-C3N4)。非均相纳米复合材料对太阳光的响应大大增强，促进了载流子的分离和转移效率。因此，它们的CO2光还原性能得到了显著的提高。在50 mg纳米复合光催化剂上，CO_2在室温下还原1小时后，CO和CH_4的最大产率分别为0.590和0.694微克分子。不同于普通的g-C3N4基复合材料中附加组分在电子-空穴分离中只起到电子汇聚的作用，本文提出了两组分相互激活的协同效应，即在氙灯照射下显著促进光生载流子的分离而激活g-C3N4，通过俘获的电子将Ce4+还原为Ce3+来激活CeO2。(C)爱思唯尔有限公司出版的2015年。
CO2 is highly stable and therefore extremely difficult to be reduced at room temperature. Herein, mesostructured CeO2/graphite carbon nitride (m-CeO2/g-C3N4) was designed and synthesized through a hard-template route. The heterogeneous nanocomposites showed greatly enhanced response to solar light, promoted charge carrier separation and transfer efficiency. Consequently, their CO2 photoreduction performance has been remarkably enhanced. Maximum CO and CH4 yields of 0.590 and 0.694 mu mol, respectively, have been obtained from the CO2 reduction after one hour irradiation at room temperature on 50 mg nanocomposite photo catalyst. Different from common g-C3N4-based composites in which the additional component only plays a role of electron sink in electron-hole separation, a synergetic effect of mutual activations between the two components is proposed, which is featured with g-C3N4 activation due to significantly promoted separation of photo -generated carriers under Xenon lamp irradiation, and CeO2 activation via the reduction of Ce4+ to Ce3+ by the trapped electrons. (C) 2015 Published by Elsevier Ltd.