Tang Yuanyuan, Xu Yinlong, Qi Caiyu, Li Xianyang, Xing Enming, Wang Fei, Kan Zigui, Wang Chunling, Tang Junyan, Zheng Guilin, Zhang Kun, Wang Xihong, Li Caolong, Yang Ke
Key Laboratory of Biomedical Functional Materials, China Pharmaceutical University, Nanjing 211198, P. R. China.
J Nanosci Nanotechnol. 2018 Dec 1;18(12):8282-8288. doi: 10.1166/jnn.2018.15879.
Cu2O nanocubes with different size (ranging from 20 nm to 400 nm) were prepared by a seed-mediated method to systematically explore the strong size-dependent properties in photocatalytic degradation of methyl orange (MO). Cu2O nanotubes were characterized by TEM, XRD, UV-Vis measurements. The size-dependent photocatalytic efficiency of the Cu2O nanocubes was evaluated by degradation of methyl orange (MO) in water under visible light (λ > 420 nm) irradiation. Furthermore, the photocurrent, linear sweep voltammetry (LSV) and electrochemical impedance spectra (EIS) measurements were applied to elucidate the size-dependent properties of Cu2O nanocubes, which demonstrated that smaller Cu2O nanocubes with certain length (30 nm) showed higher current density, faster electron transfer and lower rate of charge recombination in their exposed (100) facet. Therefore, 30 nm Cu2O nanocubes showed stronger visible light absorption capacity and higher photocatalytic activity in MO degradation among a series of nanocubes (20, 30, 100, 130, 200 and 400 nm) and their corresponding photocatalytic activities decreased with increasing the particles sizes.
通过种子介导法制备了不同尺寸（20纳米至400纳米）的氧化亚铜纳米立方体，以系统地探索其在光催化降解甲基橙（MO）过程中强烈的尺寸依赖性特性。通过透射电子显微镜（TEM）、X射线衍射（XRD）、紫外可见光谱测量对氧化亚铜纳米管进行了表征。通过在可见光（λ>420纳米）照射下水中甲基橙（MO）的降解来评估氧化亚铜纳米立方体的尺寸依赖性光催化效率。此外，还应用光电流、线性扫描伏安法（LSV）和电化学阻抗谱（EIS）测量来阐明氧化亚铜纳米立方体的尺寸依赖性特性，结果表明，具有一定长度（30纳米）的较小氧化亚铜纳米立方体在其暴露的（100）晶面上显示出更高的电流密度、更快的电子转移和更低的电荷复合率。因此，在一系列纳米立方体（20、30、100、130、200和400纳米）中，30纳米的氧化亚铜纳米立方体在MO降解中表现出更强的可见光吸收能力和更高的光催化活性，并且它们相应的光催化活性随着颗粒尺寸的增加而降低。
