We herein report small sized nickel cobaltite (NiCo₂O₄) nanosheets (103–144 nm × 71–97 nm) firmly coated on mesoporous carbon nanofibers (MCNFs), as active and stable catalysts for degradation of 4-nitrophenol in sewage with NaBH₄ as the reductant. MCNFs with surface O-functionalities were first constructed by morphology-conserved transformation of zinc-trimesic acid fibers, which provide scaffolds to anchor trisodium citrate-induced Ni-Co hydroxide nanosheets. Upon calcination, the resultant core-shell [email protected]₂O₄ nanostructures were fabricated and characterized by SEM, TEM, X-ray diffraction, Raman spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and N₂ adsorption/desorption techniques. The anchored NiCo₂O₄ nanosheets were dense (75 wt%) but well-dispersed on the surface of MCNF (pore size 4.0 nm), and proved to be highly active and stable towards the reduction of 4-nitrophenol to 4-aminophenol. It showed a large activity factor of 2.53 s⁻¹ g⁻¹, exceeding most transition metal oxide catalysts, and [email protected]₂O₄ could be cycled at least 20 times without obvious loss of activity. Temperature-programmed desorption and reduction by hydrogen (H₂-TPD and H₂-TPR) studies showed that, the metal oxide dispersion and thereby the amount of H₂ adsorbed were enhanced, and the interfacial interaction was also strengthened. These should be responsible for the excellent activity and stability of [email protected]₂O₄ towards 4-nitrophenol reduction.

我们在此报告了牢固地涂覆在介孔碳纳米纤维（MCNFs）上的小尺寸镍钴矿（NiCo ₂ O ₄）纳米片（103–144 nm×71–97 nm），作为活性和稳定的催化剂，用于NaBH降解废水中的4-硝基苯酚₄作为还原剂。具有表面O-功能的MCNFs首先通过形态守恒的锌-三苯甲基酸纤维的转变而构建，该结构提供了锚固柠檬酸三钠诱导的Ni-Co氢氧化物纳米片的支架。煅烧后，制备得到的核-壳[受电子邮件保护的] ₂ O ₄纳米结构，并通过SEM，TEM，X射线衍射，拉曼光谱，热重分析（TGA），X射线光电子能谱（XPS）和N进行表征_2种吸附/解吸技术。锚固的NiCo ₂ O ₄纳米片是致密的（75 wt％），但在MCNF的表面（孔径为4.0 nm）上分散良好，并且被证明具有高活性，并且对于将4-硝基苯酚还原为4-氨基苯酚具有稳定性。它显示出2.53 s ^-1  g ^-1的大活性因子，超过了大多数过渡金属氧化物催化剂，并且[email protected] ₂ O ₄可以循环至少20次而没有明显的活性损失。通过程序编程的氢气脱附和还原反应（H ₂ -TPD和H ₂ -TPR）研究表明，金属氧化物的分散以及由此而产生的H ₂量吸附增强，界面相互作用也增强。这些应该是[电子邮件保护的] ₂ O ₄对4-硝基苯酚还原的优异活性和稳定性的原因。