Terahertz Proton Motions in Proton-Conducting Electrolyte of Solid Oxide Fuel Cell

Takehara, Hikaru; Morimoto, Takahiro; Nagai, Masaya; Ashida, Masaaki; Okiuyama, Y.; Kani, Yukimune

doi:10.1109/irmmw-thz.2019.8874081

Cited by 1 publication

(2 citation statements)

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“…Previously, we recorded the THz time-domain spectrum of BZY20 in an uncontrolled atmosphere. 35 On the other hand, for our current work, we recorded the THz time-domain spectra in an atmosphere with a controlled H 2 O partial pressure. First, an anhydrous sample was mounted in a silica tube inserted into an electric furnace (NETSUDEN KOUGYOU Co., Ltd.), and the electric-field waveform of the THz pulse transmitted through the silica tube and the sample exposed to a flow of dry air at 2 L/min (O 2 partial pressure: 0.2 atm) was measured continuously while changing the temperature from 300 to 1073 K. The time required to measure one waveform was 4 min, and the heating rate was 4.4 K/min.…”

Section: Sample Preparation and Experimental Setupmentioning

confidence: 99%

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Phonons Damped by Proton Doping in Barium Zirconate

et al. 2023

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We show that protons strongly damp some phonons in hydrated barium zirconate. To show this, we performed terahertz spectroscopy and infrared reflection spectroscopy measurements on anhydrous and hydrous acceptor-doped barium zirconate sintered pellets. Last and Slater phonon modes are strongly damped with proton doping, whereas phonons are not damped with trivalent dopants. This is due to picosecond motion of protons, such as hydroxyl rotation and attempt motion of proton hopping, coupled with the phonon. This coupling strongly depends on the dopant, suggesting that the proton motion is strongly influenced by the dopant. The results of Raman spectroscopy support this explanation. We consider that such a dynamical long-range proton–lattice correlation will enable new approaches to improve proton conduction in solid-state ionics.

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Section: Sample Preparation and Experimental Setupmentioning

confidence: 99%

“…Previously, we recorded the THz time-domain spectrum of BZY20 in an uncontrolled atmosphere . On the other hand, for our current work, we recorded the THz time-domain spectra in an atmosphere with a controlled H 2 O partial pressure.…”

Section: Sample Preparation and Experimental Setupmentioning

confidence: 99%