Pt Loading of Phosphorus-Doped Carbon Nanotube Aerogels in Fuel Cell-Type Gas Sensors for Ultrasensitive H₂ Detection.

IF 8.2 1区化学 Q1 CHEMISTRY, ANALYTICAL ACS Sensors Pub Date : 2024-07-26 Epub Date: 2024-07-10 DOI:10.1021/acssensors.4c00948

Lingchu Huang, Huaiyuan Sun, Weijia Li, Jianyu Zhang, Sitong Feng, Qi Lu, Tong Wang, Xishuang Liang, Fangmeng Liu, Fengmin Liu, Geyu Lu

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Abstract

A phosphorus-doped carbon nanotube (CNT) aerogel as the support material was loaded with Pt nanoparticles in fuel cell-type gas sensors for ultrasensitive H₂ detection. The high surface area of the CNT scaffold is favorable to providing abundant active sites, and the high electrical conductivity facilitates the transport of carriers generated by electrochemical reactions. In addition, the CNT aerogel was doped with phosphorus (P) to further enhance the conductivity and electrochemical catalytic activity. As a result, the fuel cell-type gas sensor using the Pt/CNT aerogel doped with the optimal P content as the sensing material shows considerable performance for H₂ detection at room temperature. The sensor exhibits an ultrahigh response of -921.9 μA to 15,000 ppm of H₂. The sensitivity is -0.063 μA/ppm, which is 21 times higher than that of the conventional Pt/CF counterpart. The sensor also exhibits excellent repeatability and humidity resistance, as well as fast response/recovery; the response/recovery times are 31 and 4 s to 3000 ppm of H₂, respectively. The modulation of the structure and catalytic properties of the support material is responsible for the improvement of the sensor performance, thus providing a feasible solution for optimizing the performance of fuel cell-type gas sensors.

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燃料电池型气体传感器中掺磷碳纳米管气凝胶的铂负载，用于超灵敏 H2 检测。

以掺磷碳纳米管（CNT）气凝胶为支撑材料，在燃料电池型气体传感器中负载铂纳米粒子，用于超灵敏 H2 检测。碳纳米管支架的高表面积有利于提供丰富的活性位点，而高导电性则有利于电化学反应产生的载流子的传输。此外，为了进一步提高导电性和电化学催化活性，还在 CNT 气凝胶中掺入了磷（P）。因此，使用掺杂了最佳磷含量的铂/CNT 气凝胶作为传感材料的燃料电池型气体传感器在室温下检测 H2 方面表现出了相当高的性能。该传感器对 15,000 ppm 的 H2 具有 -921.9 μA 的超高响应。灵敏度为 -0.063 μA/ppm，是传统 Pt/CF 同等材料的 21 倍。该传感器还具有出色的重复性和耐湿性，以及快速响应/恢复能力；对 3000 ppm H2 的响应/恢复时间分别为 31 秒和 4 秒。对支撑材料的结构和催化特性进行调节是提高传感器性能的关键，从而为优化燃料电池型气体传感器的性能提供了可行的解决方案。

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来源期刊

ACS Sensors Chemical Engineering-Bioengineering

CiteScore

14.50

自引率

3.40%

发文量

372

期刊介绍： ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.