碱土金属掺杂的焦绿石 GdZrO 用作氧导体以提高 NO 传感性能。

Alkaline-Earth Metals-Doped Pyrochlore GdZrO as Oxygen Conductors for Improved NO Sensing Performance.

机构信息

National Engineering Research Center of Chemical Fertilizer Catalyst (NERC-CFC), School of Chemical Engineering, Fuzhou University, No. 523 Gongye Road, Fuzhou, 350002, Fujian, P.R. China.

State Key Laboratory of Photocatalysis on Energy and Environment, School of Chemistry, Fuzhou University, Fuzhou, 350116, P.R. China.

出版信息

Sci Rep. 2017 Jul 5;7(1):4684. doi: 10.1038/s41598-017-04920-1.

DOI:10.1038/s41598-017-04920-1

PMID:28680104

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5498611/

Abstract

This work proposed a novel strategy to fabricate highly-stable NO sensor based on a pyrochlore-phase GdZrO oxygen conductor. The incorporation of alkaline-earth metals distinctly enhances the sensing performance of the GdZrO based sensors. The excellent sensor based on GdCaZrO exhibits rapid response-recovery characteristics with the maximum response current value (ΔI = 6.4 μA), extremely short 90% responce (3 s) and 90% recovery (35 s) time towards 500 ppm NO at 500 °C, which is better than that of commercial YSZ under the same condition. The ΔI value towards NO is much higher than those towards other gases (CH, CH, CH, CO, NO, SO, CH, CO and CH), exhibiting excellent selectivity for detecting NO. The response signal basically maintains a stable value of 6.4 μA after the sensors was stored for half a month and a month. The outstanding selectivity and highly stability of the NO sensors based on GdMZrO are expected to a promising application in automotive vehicles.

摘要

这项工作提出了一种基于烧绿石相 GdZrO 氧导体制造高稳定性 NO 传感器的新策略。碱土金属的掺入明显提高了基于 GdZrO 的传感器的传感性能。基于 GdCaZrO 的优异传感器在 500°C 下对 500ppm NO 表现出快速的响应-恢复特性，最大响应电流值（ΔI=6.4μA），响应和恢复时间（90%）分别极短，为 3 s 和 35 s，优于相同条件下的商用 YSZ。ΔI 值对 NO 的响应远高于对其他气体（CH、CH、CH、CO、NO、SO、CH、CO 和 CH）的响应，对检测 NO 表现出优异的选择性。在传感器储存半个月和一个月后，其响应信号基本保持在 6.4μA 的稳定值。基于 GdMZrO 的 NO 传感器具有出色的选择性和高稳定性，有望在汽车领域得到应用。