Applied Surface Science ( IF 6.7 ) Pub Date : 2022-10-06 , DOI: 10.1016/j.apsusc.2022.155183 Min Wu, Jiawei Ye, Bei Cheng, Jiaguo Yu, Liuyang Zhang
Catalytic oxidation of formaldehyde (HCHO) at room temperature is a low-cost and efficient solution for indoor HCHO removal. In this work, NiCo2O4 nanowires were in-situ synthesized on nickel foam (NF) by a simple hydrothermal reaction and then decorated with platinum nanoparticles (NPs). The Pt/NiCo2O4-NF catalyst exhibited excellent HCHO oxidation capacity at ambient temperature, realizing a conversion rate of 90 % within 60 min. The nickel foam substrate prevents the aggregation of NiCo2O4 nanowire arrays. It also enables the growth of large-area and aligned nanowires, contributing to the uniform dispersion of Pt NPs. Moreover, due to the unique redox property and high reactivity of NiCo2O4, numerous surface oxygen vacancies and active oxygen species are generated together with Pt by NaBH4 reduction, which is beneficial to the adsorption and oxidation of HCHO. Moreover, the hierarchical macro-/mesoporous structure of Pt/NiCo2O4-NF facilitates the diffusion of gaseous reactants and provides easily accessible active sites. In contrast with nanosized catalysts, the three-dimensional (3D) Pt/NiCo2O4-NF catalyst possesses high machinability and practicability. This work may shed light on the fabrication of 3D hierarchical catalysts for oxidative HCHO removal and indoor air purification.
中文翻译:
泡沫镍上的 Pt/NiCo2O4 纳米线阵列作为室温下甲醛高效氧化的催化剂
室温下催化氧化甲醛 (HCHO) 是一种低成本且高效的室内 HCHO 去除解决方案。在这项工作中,NiCo 2 O 4纳米线通过简单的水热反应在镍泡沫(NF)上原位合成,然后用铂纳米粒子(NPs)装饰。Pt/NiCo 2 O 4 -NF催化剂在环境温度下表现出优异的HCHO氧化能力,在60分钟内实现了90%的转化率。泡沫镍基材可防止 NiCo 2 O 4的聚集纳米线阵列。它还能够生长大面积和对齐的纳米线,有助于 Pt NPs 的均匀分散。此外,由于NiCo 2 O 4独特的氧化还原性能和高反应性,NaBH 4还原反应与Pt一起生成大量表面氧空位和活性氧物种,有利于HCHO的吸附和氧化。此外,Pt/NiCo 2 O 4 -NF的分级宏观/中孔结构有利于气态反应物的扩散并提供易于接近的活性位点。与纳米级催化剂相比,三维 (3D) Pt/NiCo 2 O 4-NF催化剂具有很高的机械加工性和实用性。这项工作可能有助于制造用于氧化 HCHO 去除和室内空气净化的 3D 分级催化剂。