Ternary metal oxynitride Y₂Zr₂O_7−<i>x</i>N_<i>x</i> for selective NO₂ electrochemical sensing

Accurate and cost-effective gas sensors are essential for environmental monitoring and industrial safety, yet advancements in gas-sensitive materials remain critical for enhancing performance. Here, we report the development of a ternary metal oxynitride, Y₂Zr₂O_7-<i>x</i>N_<i>x</i> (0.49 ≤ <i>x</i> ≤ 0.98), achieved through precise nitridation time control. Applied for the first time in electrochemical gas sensors, Y₂Zr₂O_6.2N_0.8, synthesized <i>via</i> a 10-hour nitridation process, exhibited exceptional response and selectivity for nitrogen dioxide (NO₂) detection at room temperature. The enhanced performance is attributed to the role of nitrogen and oxygen vacancies, which optimize NO₂ adsorption and electron transfer. These findings highlight the potential of ternary metal oxynitrides as advanced electrochemical gas-sensitive materials, offering a transformative approach to developing high-performance, cost-effective sensors and broadening the scope of conventional gas-sensing systems.