Wang Ding, Yang Jialin, Bao Liping, Cheng Yu, Tian Liang, Ma Qingxiang, Xu Jingcheng, Li Hui-Jun, Wang Xianying
School of Material Science & Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China.
J Colloid Interface Sci. 2021 Sep;597:29-38. doi: 10.1016/j.jcis.2021.03.107. Epub 2021 Mar 22.
Hydrogen (H) molecules are easy to leak during production, storage, transportation and usage. Because of their flammability and explosive nature, quick and reliable dectection of H molecule is of great significance. Herein, an excellent H gas sensor has been realized based on Pd nanocrystal sensitized two-dimensional (2D) porous TiO (Pd/TiO). The formation of 2D porous TiO with the removal of graphene oxide template has been monitored by an in-situ transmission electron microscope. It is found that the size of the GO template can be almost completely replicated by 2D TiO. The Pd/TiO sensor exhibited an instantaneous response and a satisfactory low detection limit for H detection. These excellent gas-sensing performances (good selectivity, unique linearity response and high stability) can be attributed to the unique 2D porous structure and the synergistic effect between oxidized Pd and TiO, including the unique adsorption properties of O or/and H on Pd/TiO, the reaction between PdO and H gas, and the regulated depletion layer arising from p-type PdO to n-type TiO. This work demonstrates a rational design and synthesis of highly efficient H sensitive materials for energy and manufacturing security.
氢气（H）分子在生产、储存、运输和使用过程中容易泄漏。由于其易燃和易爆的性质，快速可靠地检测H分子具有重要意义。在此，基于钯纳米晶敏化的二维（2D）多孔TiO（Pd/TiO）实现了一种优异的氢气传感器。通过原位透射电子显微镜监测了去除氧化石墨烯模板后二维多孔TiO的形成过程。发现二维TiO几乎可以完全复制GO模板的尺寸。Pd/TiO传感器对H检测表现出即时响应和令人满意的低检测限。这些优异的气敏性能（良好的选择性、独特的线性响应和高稳定性）可归因于独特的二维多孔结构以及氧化钯与TiO之间的协同效应，包括O或/和H在Pd/TiO上的独特吸附特性、PdO与H气体之间的反应以及由p型PdO到n型TiO引起的耗尽层调节。这项工作展示了用于能源和制造安全的高效H敏感材料的合理设计与合成。
