催化作用
钴
覆盖层
氢
纳米颗粒
材料科学
化学工程
制氢
氧化钴
壳体(结构)
化学
无机化学
纳米技术
物理化学
有机化学
复合材料
工程类
作者
Lei Sun,Mingjie Liu,Tao Zhang,Yan Huang,Houhong Song,Jie Yang,Jianmin Dou,Dacheng Li,Xiaofeng Gao,Qingde Zhang,Siyu Yao
标识
DOI:10.1016/j.apcatb.2023.123537
摘要
NaBH4 hydrolysis under mild conditions is a promising solution for mobile hydrogen applications. However, the design and synthesis of cost-effective catalysts with sufficiently high activity and stability remain challenging. Herein, we report a facile approach to construct a series of SiO2 shielding cobalt-based catalysts with hierarchical active sites. Under optimized conditions, the hydrogen productivity of 18% Co@SiO2/C-300 is 8-fold higher than 18% Co/C catalyst without SiO2 shell. The incorporation of SiO2 shell enhances the partial oxidation of Co nanoparticles, resulting in the formation of a mesosphere CoOx overlayer covered by a SiO2 shell on Co particles. Meanwhile, the cobalt oxide on Co NPs could remain stable under reductive reaction conditions. The unique structural and electronic properties of the Co@SiO2/C configuration is demonstrated to enhance the activation of NaBH4 and H2O and promote H2 desorption, giving rise to a higher level of inherent activity and a relatively low reaction energy barrier.
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