Lu Lele, Xu Xinxin, Yan Jiaming, Shi Fa-Nian, Huo Yuqiu
Department of Chemistry, College of Science, Northeast University, Shenyang, 110819, P.R. China.
Dalton Trans. 2018 Feb 6;47(6):2031-2038. doi: 10.1039/c7dt03835f.
A nitrogen doped carbon matrix supported CuO composite material (Cu/Cu2O@NC) was fabricated successfully with a coordination polymer as precursor through calcination. In this composite material, CuO particles with a size of about 6-10 nm were dispersed evenly in the nitrogen doped carbon matrix. After calcination, some coordinated nitrogen atoms were doped in the lattice of CuO and replace oxygen atoms, thus generating a large number of oxygen vacancies. In Cu/Cu2O@NC, the existence of oxygen vacancies has been confirmed by electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS). Under visible light irradiation, Cu/Cu2O@NC exhibits excellent H production with the rate of 379.6 μmol h g. Its photocatalytic activity affects organic dyes, such as Rhodamine B (RhB) and methyl orange (MO). In addition to photocatalysis, Cu/Cu2O@NC also exhibits striking catalytic activity in reductive conversion of 4-nitrophenol to 4-aminophenol with in presence of sodium borohydride (NaBH). The conversion efficiency reaches almost 100% in 250 s with the quantity of Cu/Cu2O@NC as low as 5 mg. The outstanding H production and organic pollutants removal are attributed to the oxygen vacancy. We expect that Cu/Cu2O@NC will find its way as a new resource for hydrogen energy as well as a promising material in water purification.
以配位聚合物为前驱体，通过煅烧成功制备了氮掺杂碳基体负载的CuO复合材料（Cu/Cu2O@NC）。在这种复合材料中，尺寸约为6-10nm的CuO颗粒均匀分散在氮掺杂碳基体中。煅烧后，一些配位氮原子掺杂在CuO晶格中并取代氧原子，从而产生大量氧空位。在Cu/Cu2O@NC中，氧空位的存在已通过电子自旋共振（ESR）和X射线光电子能谱（XPS）得到证实。在可见光照射下，Cu/Cu2O@NC表现出优异的产氢性能，产氢速率为379.6μmol h g。其光催化活性影响有机染料，如罗丹明B（RhB）和甲基橙（MO）。除了光催化外，Cu/Cu2O@NC在硼氢化钠（NaBH）存在下将4-硝基苯酚还原转化为4-氨基苯酚的反应中也表现出显著的催化活性。在250s内，当Cu/Cu2O@NC的用量低至5mg时，转化效率几乎达到100%。优异的产氢性能和有机污染物去除能力归因于氧空位。我们期望Cu/Cu2O@NC将成为一种新的氢能资源以及水净化领域中有前景的材料。
