"Dark Deposition" of Ag Nanoparticles on TiO2: Improvement of Electron Storage Capacity To Boost "Memory Catalysis" Activity
"Dark Deposition" of Ag Nanoparticles on TiO2: Improvement of Electron Storage Capacity To Boost "Memory Catalysis" Activity
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TiO2 上银纳米颗粒的“暗沉积”：提高电子存储容量以增强“记忆催化”活性
DOI：
10.1021/acsami.8b06076
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发表时间：
2018-08-01
影响因子：
9.5
通讯作者：
Luo, Shenglian
中科院分区：
文献类型：
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作者：
Cai, Tao;Liu, Yutang;Luo, Shenglian
“记忆催化”（MC）研究由于其在黑暗条件下保持催化性能的独特能力而受到广泛关注。然而，由于目前材料的电子存储容量相对有限，MC活性仍然较低。在这里，TiO2@Ag复合材料是通过“暗沉积（DD）”的方法，这是基于TiO 2的电子陷阱效应合成的。与传统的光沉积（PD）不同，DD可以抑制Ag纳米颗粒的生长和Ag 2 O的形成，从而大大提高电子存储容量。最大电子容量的顺序为TiO 2 @Ag-DD（1 μ mol/ mg）> TiO 2 @Ag-PD（0.35 μ mol/mg）> TiO 2（0.11 μ mol/mg）。此外，增强的MC活性通过各种降解实验证实。特别地，还实现了使用TiO 2 @Ag-DD作为用于降解多组分污染物的全天候催化剂。这一策略为提高MC的活性打开了一扇大门，揭示了微生物与MC的耦合可能为昼夜连续去除污染物提供新的机会。它还可以扩展到其他领域，如能量存储和连续消毒。
"Memory catalysis" (MC) studies have received appreciable attention recently because of the unique talent to retain the catalytic performance in the dark condition. However, the MC activity is still low owing to the relatively limited electron storage capacity of the present materials. Here, a TiO2@Ag composite was synthesized by a "dark-deposition (DD)" method, which is based on the electron trap effect of TiO2. Unlike traditional photodeposition (PD), an exploration of the morphology and chemical compositions of as-prepared samples shows that DD can inhibit the growth of Ag nanoparticles and the formation of Ag2O, which greatly improve the electron storage capacity. We further demonstrated that the maximum electronic capacity was in the order of TiO2@Ag-DD (1 mu mol/ mg) > TiO2@Ag-PD (0.35 mu mol/mg) > TiO2 (0.11 mu mol/mg). Moreover, the enhanced MC activity was confirmed by various degradation experiments. Especially, the use of TiO2@Ag-DD as a round-the-clock catalyst for the degradation of multicomponent pollutants has also been achieved. This strategy opens a door for enhancing the MC activity and reveals that the coupling of photocatalysis and MC may provide a new opportunity for the continuous removal of pollutants in day and night. It also may be extended to other fields, such as energy storage and continuous disinfection.