Water vapor is one of the main factors that deactivate an ozone decomposition catalyst, which limits its applications under practical conditions. In this work, a heterostructured Ni/NiO nanocatalyst is synthesized using a citric sol–gel method, which displays 100% removal efficiency to 1000 ppm ozone at room temperature in a dry flow (space velocity 240 000 mL g^–1h^–1). Importantly, the removal efficiency is still >98% at a high relative humidity RH of 90% after 8 h of testing, which is twice the efficiency of the pure NiO nanoparticles. The high humidity resistance of the Ni/NiO nanocatalyst can be interpreted as the weak adsorption of water on its surface, as proven by H₂O temperature-programmed desorption, X-ray photoelectron spectroscopy, and chemiluminescence (CL). Surface atomic models are also established to present the reaction path of ozone on a catalyst surface under high humidity. In addition, as a proof of concept, a heterostructured Ni/NiO foam monolithic catalyst has been synthesized with nearly 100% decomposition efficiency to 10 ppm ozone at RH 90%. Therefore, these results show the great potency of the Ni/NiO heterogeneous nanocatalyst for ozone removal in harsh environments and can improve the understanding of the ozone decomposition process on a catalyst surface under high humidity.

中文翻译：

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用于臭氧分解的杂结构Ni / NiO纳米催化剂

水蒸气是使臭氧分解催化剂失活的主要因素之一，这限制了它在实际条件下的应用。在这项工作中，使用柠檬酸溶胶-凝胶法合成了异质结构的Ni / NiO纳米催化剂，该溶液在室温下以干流（空速240000 mL g ^–1 h ^–1）对1000 ppm臭氧显示100％的去除效率。。重要的是，测试8小时后，在90％的相对高相对湿度RH下，去除效率仍> 98％，是纯NiO纳米颗粒效率的两倍。Ni / NiO纳米催化剂的高耐湿性可以解释为水在其表面上的弱吸附，正如H ₂所证明的那样O程序升温解吸，X射线光电子能谱和化学发光（CL）。还建立了表面原子模型以呈现高湿度下催化剂表面上臭氧的反应路径。另外，作为概念的证明，已经合成了异质结构的Ni / NiO泡沫整体催化剂，在RH为90％时，其分解效率接近100ppm，对10ppm的臭氧。因此，这些结果表明Ni / NiO多相纳米催化剂在恶劣环境下对臭氧的去除具有巨大的潜力，并且可以提高对高湿度下催化剂表面臭氧分解过程的理解。