聚多巴胺介体促进原子级 Pt 催化剂增强 ZnO 的室温气敏性能,Chinese Journal of Structural Chemistry

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聚多巴胺介体促进原子级 Pt 催化剂增强 ZnO 的室温气敏性能
Chinese Journal of Structural Chemistry ( IF 5.9 ) Pub Date : 2023-6-15 , DOI: 10.1016/j.cjsc.2023.100069
Qian Liu , Yingyi Wen , Jian-Ze Xiao , Shao-Zhen Luo , Guan-E Wang , Peng-Yi Tang , Xiao-Liang Ye , Gang Xu

金属氧化物（MO）传感材料在室温下灵敏度较差，可以通过贵金属催化剂的改性来提高。然而，金属纳米粒子（NP）的大尺寸和不可控的形态损害了催化活性和选择性。将金属纳米粒子缩小到原子水平是一种很有前途的解决方案，因为它具有高活性和选择性。然而，在 MO 传感材料上稳定负载原子级金属的简便且通用的方法仍然具有挑战性。在此，我们提出了一种利用双功能介体层构建协同配位界面的策略，以在 MO 基气敏材料上均匀负载原子级金属催化剂。在这项工作中，原子分散的 Pt 催化剂使用聚多巴胺 (PDA) 作为介体协调锚定在 ZnO 纳米棒 (NR) 上。结果，与原始ZnO NRs相比，在0.20 wt% Pt–CZnO@PDA-1.5 nm上，对100 ppm NO2的响应提高了六倍，达到18,489%，并且选择性也得到了提高。这种灵敏度高于大多数报道的贵金属修饰的 MO NO2 传感材料。这项工作为使用原子级贵金属催化剂构建高灵敏度和选择性气敏材料提供了一种简单而通用的策略。

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Enhanced Room Temperature Gas Sensing Performance of ZnO with Atomic-Level Pt Catalysts Facilitated by the Polydopamine Mediator

The poor sensitivity of metal-oxide (MO) sensing material at room temperature can be enhanced by the modi?cation of noble metal catalysts. However, the large size and uncontrollable morphology of metal nanoparticles (NPs) compromise the catalytic activity and selectivity. Downsizing metal NPs to the atomic level is a promising solution because it offers high activity and selectivity. Nevertheless, a facile and universal approach for stable loading atomic-level metal on MO-based sensing materials is still challenging. Herein, we present a strategy to construct synergetic coordination interface for uniform loading of atomic-level metal catalysts on MO-based gas sensing materials using a difunctional mediator layer. In this work, atomically dispersed Pt catalysts are coordinately anchored on ZnO nanorods (NRs) using polydopamine (PDA) as a mediator. As a result, compared with pristine ZnO NRs, a six-fold enhanced response of 18,489% is achieved toward 100 ppm NO2 on 0.20 wt% Pt¨CZnO@PDA-1.5 nm, and the selectivity is also promoted. Such sensitivity is higher than that of most reported noble metal-modi?ed MO NO2-sensing materials. This work provides a simple and general strategy for building highly sensitive and selective gas-sensing materials using atomic-level noble metal catalyst.

更新日期：2023-07-28

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