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.
摘要：
将磷掺杂的碳纳米管（CNT）气凝胶作为载体材料，在燃料电池型气体传感器中负载Pt纳米颗粒，用于超灵敏的H2检测。CNT支架的高表面积有利于提供丰富的活性位点,和高导电性促进由电化学反应产生的载流子的传输。此外,在CNT气凝胶中掺杂磷(P)以进一步提高导电性和电化学催化活性。因此,使用掺杂有最佳P含量的Pt/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对H2检测显示出相当大的性能。该传感器表现出-921.9μA至15,000ppm的H2的超高响应。灵敏度为-0.063μA/ppm,是常规Pt/CF对应物的21倍。该传感器还具有出色的可重复性和耐湿性，以及快速响应/恢复；响应/恢复时间分别为31和4s到3000ppm的H2。载体材料的结构和催化性能的调制负责传感器性能的改善，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。
