Abstract
Developing high-performance sensing electrodes is crucial for solid-electrolyte potentiometric gas sensors. This work reports a surface modification route to tune the H2 sensing properties of a mixed ionic-electronic conducting Pr0.1Ce0.9O2-δ electrode. Loading basic oxides was detrimental, while acidic oxides, particularly SnO2, enhanced the sensing performance. SnO2 modification markedly increased the response and sensitivity and significantly decreased the limit of detection and response time. Electrochemical analyses revealed that SnO2 modification slightly inhibited the oxygen exchange reaction but considerably accelerated the hydrogen oxidation reaction, primarily due to changes in the gaseous/surface processes. The sensing behavior agreed with the mixed-potential mechanism, and the enhanced sensing properties by SnO2 were attributed to an increase in the electrochemical activity ratio. These findings offer a facile approach to boost H2 sensing by tailoring the electrochemical activities.
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