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Issue 13, 2018
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Hydride ion (H) transport behavior in barium hydride under high pressure

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Abstract

Hydride ions (H) have an appropriate size for fast transport, which makes the conduction of H attractive. In this work, the H transport properties of BaH2 have been investigated under pressure using in situ impedance spectroscopy measurements up to 11.2 GPa and density functional theoretical calculations. The H transport properties, including ionic migration resistance, relaxation frequency, and relative permittivity, change significantly with pressure around 2.3 GPa, which can be attributed to the structural phase transition of BaH2. The ionic migration barrier energy of the P63/mmc phase decreases with pressure, which is responsible for the increased ionic conductivity. A huge dielectric constant at low frequencies is observed, which is related to the polarization of the H dipoles. The current study establishes general guidelines for developing high-energy storage and conversion devices based on hydride ion transportation.

Graphical abstract: Hydride ion (H−) transport behavior in barium hydride under high pressure

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Publication details

The article was received on 14 Dec 2017, accepted on 06 Mar 2018 and first published on 06 Mar 2018


Article type: Paper
DOI: 10.1039/C7CP08386F
Citation: Phys. Chem. Chem. Phys., 2018,20, 8917-8923
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    Hydride ion (H) transport behavior in barium hydride under high pressure

    X. Zhang, X. Wang, Q. Wang, X. Ma, C. Liu, P. Li, C. Liu, Y. Han, Y. Ma and C. Gao, Phys. Chem. Chem. Phys., 2018, 20, 8917
    DOI: 10.1039/C7CP08386F

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