Catalytic formaldehyde (HCHO) oxidation at ambient temperature is an efficient technology for indoor air purification. Herein, flexible nickel (Ni) foam coated with Pt/NiO nanoflake catalysts were prepared through fast chemical bath deposition, which exhibited enhanced activity for HCHO removal at room temperature. In contrast, no HCHO oxidation activity was observed for control samples without loading platinum (Pt) or coating nickel(II) oxide (NiO) nanoflakes. By optimizing the deposition duration, almost 90% HCHO removal efficiency was achieved within 1 h over the sample with 1 h deposition time. The deposition of NiO nanoflakes over Ni foam not only forms hierarchical structure facilitating the reactions kinetically, but also provides sufficient oxygen vacancies promoting Pt deposition and consequent HCHO oxidation. The HCHO oxidation activity of the catalysts positively correlated with Pt dispersion and with the proportion of oxygen-deficient NiO, as determined by hydrogen temperature programmed reduction. Moreover, the mechanism of room-temperature HCHO catalytic oxidation over as-prepared catalysts was investigated by in-situ diffuse reflectance infrared Fourier transform spectra, which identified formate and dioxymethylene as the main reaction intermediate. Compared with powder-like catalysts, the Ni foam-supported Pt/NiO catalysts are of great flexibility and machinability, holding great promise for actual application.

中文翻译：

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用Pt / NiO纳米薄片装饰的柔性镍泡沫塑料，具有氧空位，可在室温下增强甲醛催化氧化作用

在环境温度下催化甲醛（HCHO）氧化是一种有效的室内空气净化技术。本文中，通过快速化学浴沉积制备了涂覆有Pt / NiO纳米片状催化剂的柔性镍（Ni）泡沫，该泡沫在室温下具有去除HCHO的增强活性。相反，未加载铂（Pt）或未涂覆氧化镍（II）纳米薄片的对照样品，未观察到HCHO氧化活性。通过优化沉积时间，在1 h的沉积时间内，样品在1 h内达到了将近90％的HCHO去除效率。NiO纳米薄片在Ni泡沫上的沉积不仅形成了促进动力学反应的分层结构，而且还提供了足够的氧空位，从而促进了Pt的沉积和随之而来的HCHO氧化。催化剂的HCHO氧化活性与Pt分散度和缺氧NiO的比例呈正相关，如氢程序升温还原所确定的。此外，通过原位漫反射红外傅里叶变换光谱研究了室温下HCHO在制备的催化剂上催化氧化的机理，确定了甲酸酯和二甲醛为主要反应中间体。与粉末状催化剂相比，Ni泡沫负载的Pt / NiO催化剂具有很大的柔韧性和可加工性，对实际应用具有广阔的前景。通过原位漫反射红外傅里叶变换光谱研究了室温下HCHO在制备的催化剂上催化氧化的机理，确定了甲酸酯和二甲醛为主要反应中间体。与粉末状催化剂相比，Ni泡沫负载的Pt / NiO催化剂具有很大的柔韧性和可加工性，对实际应用具有广阔的前景。通过原位漫反射红外傅里叶变换光谱研究了室温下HCHO在制备的催化剂上催化氧化的机理，确定了甲酸酯和二甲醛为主要反应中间体。与粉末状催化剂相比，Ni泡沫负载的Pt / NiO催化剂具有很大的柔韧性和可加工性，对实际应用具有广阔的前景。