Single-atom catalysts (SACs) supported on inorganic materials have been confirmed as effective active sites in catalytic reaction. In order to develop gas sensing material with high performance, we reported an atomically dispersed Pt on MOF-derived InO via N doped graphene (NG) sacrificial templating route for the first time. This synthesis strategy, which combines metal-organic frameworks (MOF) precursor and NG template, not only greatly regulates the physicochemical properties of InO, but also makes the single-atom Pt be anchored on InO. Herein, the effect of Pt and NG was discussed based on various characterization methods. Gas sensing tests revealed that the highly dispersed Pt helps to improve the HCHO sensing performance. The Pt SACs inclusion increases the specific surface area, the contents of oxygen vacancies and adsorbed oxygen species of InO, thus increasing the active sites on the surface. These enhancements result in high response (750.4 to 100 ppm), good selectivity, rapid response (2 s to 100 ppm) and low theoretical limit of detection (8.4 ppb) of Pt-InO based sensor to HCHO. In a word, atomically dispersed Pt loaded MOF-derived InO is an efficient sensing material for selective detection of HCHO.

中文翻译：

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MOF 衍生的 In2O3 上原子分散的 Pt 用于化学电阻甲醛气体传感

无机材料负载的单原子催化剂（SAC）已被证实是催化反应中的有效活性位点。为了开发高性能的气敏材料，我们首次报道了通过氮掺杂石墨烯（NG）牺牲模板路线在 MOF 衍生的 InO 上原子分散的 Pt。这种结合金属有机骨架（MOF）前驱体和NG模板的合成策略，不仅极大地调节了InO的物理化学性质，而且使单原子Pt锚定在InO上。在此，基于各种表征方法讨论了 Pt 和 NG 的影响。气敏测试表明，高度分散的 Pt 有助于提高 HCHO 传感性能。Pt SACs夹杂物增加了InO的比表面积、氧空位含量和吸附氧物种，从而增加了表面的活性位点。这些增强功能使得基于 Pt-InO 的传感器对 HCHO 具有高响应（750.4 至 100 ppm）、良好的选择性、快速响应（2 s 至 100 ppm）和低理论检测限（8.4 ppb）。总之，原子分散的 Pt 负载 MOF 衍生的 InO 是一种用于选择性检测 HCHO 的有效传感材料。