Work

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

Year: 2026

Type: article

Abstract: 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.

Source: Nano Convergence

DOI: 10.1186/s40580-026-00539-z

Authors: Namhee Kim, Jeongyun Lee, Dasol Jin, Youngmi Lee, Myung Hwa Kim

Institutions: Ewha Womans University, Jeonbuk National University

Language: English

Topic: Electrochemical sensors and biosensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,990

Funders: National Research Foundation, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Jeonbuk National University