Bimetallic Conductive Co/Fe-HITP for Sensitive H₂S Detection at Low Temperature.

Authors

Yongjiao Sun, Jing Yang, Bingliang Wang, Bowen Xiang, Zhenting Zhao, Wenda Wang, Wendong Zhang, Koichi Suematsu, Kengo Shimanoe, Jie Hu

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e75135. Aug 29, 2026. Epub Aug 29, 2026.

Abstract

The metal nodes in conductive metal-organic (c-MOFs) play a crucial role in determining surface chemical activity. Tuning the metal sites of Co₃(HITP)₂ is expected to enhance its low-temperature gas sensing performance. Here, a series of bimetallic Co/Fe-HITP materials are synthesized by partially substituting Co with Fe ions at varying Fe/Co ratios. Gas sensing tests reveal that the Fe incorporation not only improves the response of H₂S at low temperature but also reduces the fluctuations caused by low temperatures. The optimal Co_1.5Fe_1.5-HITP_9.5 sensor delivers a response of 10.05 toward 20 ppm H₂S at room temperature (25°C) and 9.69 at a refrigerating temperature (0°C), with corresponding LODs of 18.9 ppb and 16.8 ppb, respectively. Density functional theory (DFT) calculations on Co-HITP, Co₂Fe₁-HITP_9.5, and Co₁Fe₂-HITP_9.5 show that increasing the Fe content leads to a larger absolute adsorption energy, rationalizing the enhanced low-temperature sensing performance. Furthermore, band structure analysis elucidates the origin of the higher surface catalytic activity upon Fe substitution. This work establishes bimetallic Co/Fe-HITP as a promising platform for sensitive, low-temperature H₂S detection.

PMID:
42667128
Bibliographic data and abstract were imported from PubMed on 29 Aug 2026.

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