Photocatalysis is a feasible method for degrading indoor formaldehyde (HCHO) pollutants. To improve the purification efficiency and lower the cost of using noble metals as the primary component of the catalyst, synergistic catalysis involving two catalytic modes, such as thermocatalysis/photocatalysis, has attracted significant attention. In this study, a monolithic catalyst was prepared by loading reduced graphene oxide (rGO) and cerium dioxide (CeO₂) on a nickel foam (NF) matrix. It was observed that the HCHO removal efficiency could be > 93 % under xenon light. The pre-deposited rGO on the NF matrix served as the photothermal conversion layer and contributed to the uniform and stable loading of CeO₂. The surface temperature of this synthesized monolithic catalyst could rapidly rise to 170 °C. In addition, the heat was distributed evenly because of the increased near-infrared (NIR) light absorption caused by the added rGO and high electron mobility owing to the heat-conducting property of NF. At this temperature, the oxidation of HCHO was stimulated not only by the lattice oxygen of CeO₂ but also by the production of O₂^– via oxidation by photogenerated electrons. In addition, O₂^– would reoxidize Ce³⁺ to Ce⁴⁺ on oxygen vacancies and accelerate the lattice oxygen consumption and supply cycle to reinforce the existing Mars-van Krevelen (MvK) mechanism.

光催化是降解室内甲醛（HCHO）污染物的可行方法。为了提高净化效率并降低使用贵金属作为催化剂主要成分的成本，涉及两种催化模式（如热催化/光催化）的协同催化引起了人们的广泛关注。在这项研究中，通过在泡沫镍 (NF) 基质上负载还原氧化石墨烯 (rGO) 和二氧化铈 (CeO ₂ ) 来制备整体催化剂。据观察，在氙灯下 HCHO 去除效率可以 > 93%。NF基体上预沉积的rGO作为光热转换层，有助于CeO _{2的均匀稳定负载}. 这种合成的整体催化剂的表面温度可以迅速升至 170 °C。此外，由于添加的 rGO 增加了近红外 (NIR) 光吸收，并且由于 NF 的导热特性导致高电子迁移率，因此热量分布均匀。在此温度下，HCHO 的氧化不仅受到 CeO ₂的晶格氧的刺激，而且还受到O _2的产生^——通过光生电子的氧化。此外，O ₂ ^{–会在氧空位上将 Ce 3+}重新氧化为 Ce ⁴⁺并加速晶格氧消耗和供应循环，以加强现有的 Mars-van Krevelen (MvK) 机制。