A cobalt tungstate compound sensing electrode for hydrogen detection based upon mixed-potential type sensors

Abstract

An yttria-stabilized cubic zirconia (YSZ) based mixed-potential sensor coupled with CoWO 4 as the sensing electrode was developed for hydrogen detection at elevated temperatures. The developed CoWO 4 /YSZ/Pt sensor was found to have a good sensitivity to different concentrations of hydrogen from 80 ppm to 960 ppm in a background of 10% O 2 /N 2 at 450 C. The sensor showed excellent selectivity to several possible interferents such as CO, C 3 H 8 and NO 2 . The reproducibility and signal repeatability of the sensor was examined to test the reliability of the sensor. The influence of oxygen variation and humidity in the background on the sensor response was also studied.

Bifunctional electro-catalytic performances of CoWO4 nanocubes for water redox reactions (OER/ORR)

“…The observed peaks at 780.89 and 796.63 eV could be assigned to Co 2p 3/2 and Co 2p 1/2 , respectively. 45 The O 1s peaks were obtained at 529.21 and 529.86 eV as shown in Fig. 2c.…”

Skin-Attachable, Stretchable Electrochemical Sweat Sensor for Glucose and pH Detection

“…49 From these results, cobalt ions are considered to exist in the divalent state and tungstate ion exists as +6 valence state. 49,51 Figure S4c shows two peaks of O 1s at 529.8 and 531.1 eV, corresponding to the metal−oxygen bond and −OH bond. 52 In the element analysis, Co and W exist in the ratio of 1:1, which indicates the formation of CoWO 4 nanoparticles.…”

Effects of Pt Loading onto SnO2 Ordered Porous Thin Films on Potentiometric Hydrogen Sensing Properties

“…Table I displays the response characteristics of state-of-the-art planar mixed-potential hydrogen sensors. 23,27,44,[47][48][49][50][51][52] Obviously, compared to thick-film sensors, thin-film sensors exhibited significantly shorter response time and recovery time. For thin-film sensors, the Pt/SnO 2 composite thin film (SnO 2 -2) in this work achieved larger response values to hydrogen compared to the pristine SnO 2 thin film (SnO 2 -0).…”