Hierarchical Pt/MnO2-Ni(OH)(2) Hybrid Nanoflakes with Enhanced Room-Temperature Formaldehyde Oxidation Activity
Hierarchical Pt/MnO2-Ni(OH)(2) Hybrid Nanoflakes with Enhanced Room-Temperature Formaldehyde Oxidation Activity
复制标题
具有增强室温甲醛氧化活性的多级Pt/MnO2-Ni(OH)(2)杂化纳米片
DOI：
10.1021/acssuschemeng.8b03139
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发表时间：
2018
影响因子：
8.4
通讯作者：
Jiang Chuanjia
中科院分区：
文献类型：
--
作者：
Huang Shuying;Cheng Bei;Yu Jiaguo;Jiang Chuanjia
通过原位水热法制备二氧化锰-氢氧化镍（MnO 2-Ni（OH）2）分级纳米片，再经还原-硼氢化物还原制备存款分散良好的铂（Pt）纳米颗粒，制备了泡沫镍（NF）负载Pt/MnNi@NF催化剂。考虑到Pt或MnO 2-Ni（OH）2不存在时HCHO氧化活性的不足以及粉末状Pt/MnO 2-Ni（OH）2不存在时活性的不足，由于Pt、MnNi纳米片和NF基底的协同作用，自支撑复合催化剂表现出改善的室温甲醛（HCHO）氧化性能。MnO 2和Ni（OH）2的表面羟基有利于吸附HCHO，而Pt NPs则有利于活性氧物种的形成。此外，MnO 2表面的氧空位有利于活性氧物种的迁移。NF不仅作为一个衬底，但也有助于形成更薄的纳米片具有更大的横向尺寸和更小的晶粒尺寸，从而暴露更多的活性位点，并改善Pt纳米粒子的均匀分散。因此，这种NF负载的自支撑复合催化剂在室内甲醛减排中具有很大的应用前景。
Nickel foam (NF)-supported Pt/MnNi@NF catalyst was prepared via in situ hydrothermal growth of manganese dioxide–nickel(II) hydroxide (MnO2–Ni(OH)2) hierarchical nanosheets and subsequent impregnation–borohydride reduction to deposit well-dispersed platinum (Pt) nanoparticles (NPs). The free-standing composite catalyst exhibited improved performance for room-temperature formaldehyde (HCHO) oxidation due to synergistic effect of Pt, MnNi nanosheets, and the NF substrate, considering the lack of HCHO oxidation activity in the absence of Pt or MnO2–Ni(OH)2and low activity of powder-like Pt/MnO2–Ni(OH)2in the absence of NF. Surface hydroxyl (OH) groups of MnO2and Ni(OH)2were helpful for the adsorption of HCHO, while Pt NPs facilitated the formation of active oxygen species. Besides, oxygen vacancies on the surface of MnO2were beneficial for the migration of active oxygen species. The NF not only served as a substrate but also contributed to the formation of thinner nanosheets with larger lateral size and smaller grain size, thus exposing more active sites and improving the homogeneous dispersion of Pt nanoparticles. Therefore, this NF-supported free-standing composite catalyst holds great promise for application in indoor HCHO abatement.