The nano-structured NiO powder obtained by sol-gel method was doped with 10 wt% gold in order to modify its morphology as well as its electrochemical catalytic activity.The NO_x sensing characteristics of mixed-potent...The nano-structured NiO powder obtained by sol-gel method was doped with 10 wt% gold in order to modify its morphology as well as its electrochemical catalytic activity.The NO_x sensing characteristics of mixed-potential-type YSZ-based planar sensors attached with each of the nano-NiO and the Au-doped nano-NiO materials as a sensing electrode SE) were examined at temperatures of 700℃～800℃.The Au-doped NiO-SE was found to give a large enhancement in the NO_2 sensitivity as well as the NO_2 selectivity at 800℃under wet condition,in comparison with the pure NiO-SE.The reason for the improvement in the NO_2 sensitivity was examined based on the data of polarization curves,impedance spectra and catalytic activity for the gas-phase NO_2 decomposition.展开更多
文摘The nano-structured NiO powder obtained by sol-gel method was doped with 10 wt% gold in order to modify its morphology as well as its electrochemical catalytic activity.The NO_x sensing characteristics of mixed-potential-type YSZ-based planar sensors attached with each of the nano-NiO and the Au-doped nano-NiO materials as a sensing electrode SE) were examined at temperatures of 700℃～800℃.The Au-doped NiO-SE was found to give a large enhancement in the NO_2 sensitivity as well as the NO_2 selectivity at 800℃under wet condition,in comparison with the pure NiO-SE.The reason for the improvement in the NO_2 sensitivity was examined based on the data of polarization curves,impedance spectra and catalytic activity for the gas-phase NO_2 decomposition.
