Tuning Redistribution of CuOx Nanoparticles on TiO2 Support.
Tuning Redistribution of CuOx Nanoparticles on TiO2 Support.
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DOI：
10.1021/acsami.3c10035
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发表时间：
2023-10
影响因子：
9.5
通讯作者：
Xuezhong Nie;Yehong Wang;J. Mu;Jianyu Han;Huixiang Li;Nengchao Luo;Zhipeng Huang;Qiang Guo
中科院分区：
文献类型：
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作者：
Xuezhong Nie;Yehong Wang;J. Mu;Jianyu Han;Huixiang Li;Nengchao Luo;Zhipeng Huang;Qiang Guo
纳米颗粒表现出独特的催化性能，这取决于它们的纳米尺寸。然而，控制负载型催化剂的颗粒大小仍然具有挑战性。在这里，我们提出了一种方法，通过物理添加原始的二氧化钛来实现CuOx纳米颗粒在金红石型二氧化钛载体上的可调再分布。通过开尔文探针力显微镜和电子结合能分析表明，二氧化钛载体和二氧化钛添加剂之间的功函数差(WFD)是导致再分配的主要原因，两者的值不同。添加功函数较低的二氧化钛(金红石)促进了电子向CuOx/二氧化钛复合材料的转移，导致纳米粒子的聚集，而添加功函数较高的二氧化钛(锐钛矿型)会使二氧化钛表面的CuOx变小。在金红石型二氧化钛的加入下，CuOx的粒径和电子密度增大，在5h内促进了硝基苯的完全转化率(100%)，是锐钛矿型二氧化钛分散降解CuOx(36.9%)的2.7倍。
Nanoparticles exhibit unique catalytic performance, depending on their nanoscale size. However, controlling the particle size of the supported catalysts is still challenging. Here, we present a method for tunable redistribution of CuOx nanoparticles on rutile TiO2 support by physically adding pristine TiO2. The redistribution is driven by the work function difference (WFD) between the TiO2 support and the TiO2 additive, both of which exhibit distinct values, as determined through Kelvin probe force microscopy and electron binding energy analysis. Addition of TiO2 with lower work function (rutile) promotes electron transfer toward the CuOx/TiO2 composite, resulting in nanoparticle aggregation, while addition of TiO2 with higher work function (anatase) results in smaller CuOx on TiO2. The increase in particle size and electron density of CuOx, driven by the addition of rutile TiO2, promoted the complete conversion of nitrobenzene (100%) within 5 h. This is 2.7 times that of dispersed and degraded CuOx driven by mixing with anatase TiO2 (36.9%).