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<p>Nanomaterial-based electrochemical sensors are promising tools in atmospheric chemistry, offering reliable detection of toxic gases. Here, we report a single-phase tetrametallic spinel oxide, (Mn<sub>0.56</sub>Cr<sub>0.77</sub>Rh<sub>0.77</sub>Ni<sub>0.90</sub>)O<sub>4</sub> (MCRN-O), as an electrode material for amperometric H<sub>2</sub>S sensing. Synergistic interactions among multiple cations within the spinel framework enabled homogeneous integration, imparting distinctive physicochemical properties and superior electrochemical performance. In deaerated phosphate-buffered saline solution (0.05&#xa0;M), MCRN-O delivered high sensitivity (0.0084 µA µM<sup>–1</sup>) and a low detection limit (0.058 µM), markedly outperforming the comparison samples MCN-O and MC-O. It also exhibited excellent selectivity, with coefficient values below − 2 for CO and NO, while achieving performance comparable to or better than previously reported electrochemical H<sub>2</sub>S sensors.</p> Graphical abstract <p></p>

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Heterogeneous metal substitution–driven selectivity enhancement in single-phase spinel oxides for interference-free electrochemical hydrogen sulfide detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月23日

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  • Namhee Kim,
  • Jeongyun Lee,
  • Dasol Jin,
  • Youngmi Lee,
  • Myung Hwa Kim

摘要

Nanomaterial-based electrochemical sensors are promising tools in atmospheric chemistry, offering reliable detection of toxic gases. Here, we report a single-phase tetrametallic spinel oxide, (Mn0.56Cr0.77Rh0.77Ni0.90)O4 (MCRN-O), as an electrode material for amperometric H2S sensing. Synergistic interactions among multiple cations within the spinel framework enabled homogeneous integration, imparting distinctive physicochemical properties and superior electrochemical performance. In deaerated phosphate-buffered saline solution (0.05 M), MCRN-O delivered high sensitivity (0.0084 µA µM–1) and a low detection limit (0.058 µM), markedly outperforming the comparison samples MCN-O and MC-O. It also exhibited excellent selectivity, with coefficient values below − 2 for CO and NO, while achieving performance comparable to or better than previously reported electrochemical H2S sensors.

Graphical abstract