Quantitative Depth Profiling of Biporous Nickel Electrodes by Frequency-Domain Laser-Induced Photoacoustic Spectroscopy

摘要: Frequency-domain Photoacoustic Spectroscopy (PAS) was used with a He-Ne laser exciting beam to probe commercially available, powdered and pressed nickel electrodes dual-porosity profiles. The frequency response of the shown be capable providing quantitative information about thermal conductivity diffusivity each two porous layers, provided depth porosity junction in electrode bulk is known. reasonable agreement experimental data one-dimensional mathematical model photoacoustic from two-layer, photoacoustically saturated, continuous system indicates that behave approximately like simple composite-layer solid. This conclusion, together PAS results uniporous electrodes, emphasizes high potential spectroscopy as nondestructive, profiling, analytical technique for determination complex profiles manufactured use electrochemical energy conversion devices, such fuel cells.