Cubic Cu2O nanoparticles decorated on TiO2 nanofiber heterostructure as an excellent synergistic photocatalyst for H2 production and sulfamethoxazole degradation
Cubic Cu2O nanoparticles decorated on TiO2 nanofiber heterostructure as an excellent synergistic photocatalyst for H2 production and sulfamethoxazole degradation
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DOI：
10.1016/j.apcatb.2021.120221
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发表时间：
2021-04-27
影响因子：
22.1
通讯作者：
Sasaki, Keiko
中科院分区：
文献类型：
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作者：
Sekar, Karthikeyan;Chuaicham, Chitiphon;Sasaki, Keiko
我们报告了一种简单的策略，可提供均匀的 TiO2 纳米纤维主体环境，以稳定平均尺寸约为 60 nm 且具有高分散性的 Cu2O 纳米颗粒。我们发现，一小部分与TiO2纳米纤维阵列直接接触/部分浸没的Cu2O纳米粒子（直径约为300 nm，长度约为650 nm）表现出优异的协同光催化性能，H-2产率为48 mu mol g (-1) h(-1)，表观量子效率为3.6 %。与未改性的TiO2-NF 相比，H-2 生产率要高得多（大约是6.5 倍）。此外，协同Cu2O/TiO2-NF光催化剂对磺胺甲恶唑(7 x 10(-2) mmol g(-1) min(-1))表现出显着的氧化降解作用，并且在五个循环中高度稳定。一小部分 Cu2O 纳米颗粒分散良好，形成异质结界面，促进电荷转移并提供活性位点。这一论点通过形态表征、能带排列、电子陷阱的能量分辨分布、电化学瞬态光电流和电化学阻抗 (EIS) 得到验证。此外，还详细讨论了通过 X 射线光电子能谱 (XPS)、X 射线荧光 (XRF) 和 X 射线近边缘吸收结构 (XANES) 测定的表面和块体元素组成。
We report a simple strategy for providing a homogenous TiO2 nanofibre host environment to stabilize Cu2O nanoparticles with an average size of similar to 60 nm and high dispersibility. We found that the small fraction of Cu2O nanoparticles in direct contact/partially submerged with TiO2 nanofibre arrays (diameter similar to 300 nm and length similar to 650 nm) showed excellent synergistic photocatalytic performance for H-2 production rate of 48 mu mol g (-1) h(-1) with an apparent quantum efficiency of 3.6 %. The H-2 production rate was much higher (factor of similar to 6.5 times) compared with unmodified TiO2-NF. In addition, the synergistic Cu2O/TiO2-NF photocatalyst showed significant oxidative-degradation of sulfamethoxazole (7 x 10(-2) mmol g (-1) min(-1)) and was highly stable during five cycles. The small fraction of Cu2O nanoparticles are well dispersed and form heterojunction interfaces to promote charge transfer and provide active sites. This argument is verified by morphology characterisation, band alignment, energy-resolved distribution of electron traps, electrochemical transient photocurrent, and electrochemical impedance (EIS). In addition, a detailed discussion is provided regarding the surface and bulk elemental composition determined by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), and X-ray absorption near edge structure (XANES).