Work

Impact of Polarization Voltage on Sensitivity and Discharge Kinetics of Pulsed Polarized Pt|YSZ|Pt NO x -Sensors

Year: 2026

Type: article

Abstract: The influence of polarization voltage on the sensitivity and discharge behavior of a previously reported highly selective pulsed‐polarized Pt|YSZ|Pt NO x -sensor was investigated. A measurable NO x ‐induced acceleration of self‐discharge was observed at polarization voltages as low as 50 mV, indicating that no minimum voltage threshold is required for signal generation. In the intermediate polarization voltage range (200–1000 mV), both sensitivity and signal amplitude increase approximately linearly, which is attributed to the formation of an oxygen activity gradient contributing to the sensor voltage. The results are consistent with a relaxation process of a polarization-induced oxygen activity gradient. The discharge appears to be governed by oxygen replenishment of the oxygen-depleted electrode, while NO x , most likely via NO 2 -mediated oxygen exchange reactions, accelerates this relaxation process. At higher voltages (>1000 mV), additional faradaic processes become increasingly relevant and may reduce the NO x sensitivity. Water-related electrochemical reactions are one possible contribution but cannot be identified unambiguously from the present measurements. An optimal operating range is identified around 1000 mV, balancing sensitivity and side reactions.

Source: ECS Journal of Solid State Science and Technology

DOI: 10.1149/2162-8777/aeb869

Authors: Nils Donker, Jens Zosel, Ralf Moos, Daniela Schönauer-Kamin

Institution: University of Bayreuth

Language: English

Topic: Gas Sensing Nanomaterials and Sensors

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $1,950

Funder: Deutsche Forschungsgemeinschaft