High-temperature hydrogen sensor based on MOFs-derived Mn-doped In2O3 hollow nanotubes

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2024-07-02 DOI:10.1016/j.ijhydene.2024.06.371

Cong Qin , Zhanxiang Wei , Xiaoyan Zhao , Jianliang Cao , Yan Wang

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Abstract

Developing high-temperature hydrogen (H₂) sensors with fast response speed is urgently demanded in harsh application environments, especially for chemical industries and the aerospace field. Herein, we have reported a facile strategy to synthesize Mn-doped In₂O₃ hollow nanotubes (Mn-In₂O₃) by solvothermal and annealing route using In-MOFs as precursors. The experimental results indicate that the obtained products possess hollow nanotube structures with plenty of holes and Mn doping greatly boosts the gas-sensing performance of In₂O₃-based sensors towards H₂. In particular, the responses of 3 mol% Mn-In₂O₃ are 2.57 and 2.3 towards 50 ppm H₂ at 360 °C and 400 °C, respectively, which are much higher than those of bare In₂O₃ hollow nanotubes. Besides, the sensor based on 3 mol% Mn-In₂O₃ exhibits a low limit of detection (25 ppb), excellent selectivity, rapid response/recovery speed (∼4 and ∼15 s@20 ppm), and excellent stability at high temperature (360 °C). Such enhancement of H₂-sensing properties can be put down to the hollow structure derived from In-MOFs and abundant oxygen vacancy defects produced by Mn doping. The Mn-In₂O₃ hollow nanotubes could be regarded as promising materials for selectively detecting H₂ in a wide range of concentrations.

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基于 MOFs 衍生的掺锰 In2O3 中空纳米管的高温氢传感器

在恶劣的应用环境中，尤其是在化学工业和航空航天领域，迫切需要开发响应速度快的高温氢气（H2）传感器。在此，我们报告了一种以 In-MOFs 为前驱体，通过溶热和退火路线合成掺锰 In2O3 中空纳米管（Mn-In2O3）的简便策略。实验结果表明，获得的产品具有多孔空心纳米管结构，掺杂锰大大提高了基于 In2O3 的传感器对 H2 的气体传感性能。其中，3 mol% Mn-In2O3 在 360 ℃ 和 400 ℃ 下对 50 ppm H2 的响应分别为 2.57 和 2.3，远高于裸 In2O3 中空纳米管。此外，基于 3 mol% Mn-In2O3 的传感器还具有检测限低（25 ppb）、选择性好、响应/恢复速度快（∼4 和 ∼15 s@20 ppm）以及在高温（360 °C）下稳定性好等特点。这种 H2 传感特性的增强可归因于 In-MOFs 的中空结构和掺杂锰后产生的大量氧空位缺陷。Mn-In2O3 中空纳米管可被视为在广泛浓度范围内选择性检测 H2 的理想材料。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.