Abstract
Nickel oxide-based materials have attracted significant interest for a variety of energy conversion applications although many of their structures remain unresolved. In this study, Density Functional Theory+U (DFT+U) and hybrid DFT calculations are used to analyze the properties of crystalline nickel oxyhydroxide (β-NiOOH) with hydrogen (H) vacancies. Hydrogen vacancies are found to lower the band gap without creating states inside the band gap. Inter-layer crossing is a possible transport pathway, while intra-layer transport is inhibited. Bulk modulus is not influenced by H vacancies in the crystal. β-NiOOH with H vacancies exhibits good electronic properties, essential for solid electrolytes and anodes in solid oxide fuel cells.
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Acknowledgments
This research was supported by the Nancy and Stephen Grand Technion Energy Program, the I-CORE Program of the Planning and Budgeting Committee, and The Israel Science Foundation (Grant no. 152/11), and the Pazy Foundation. This work was supported by the post LinkSCEEM-2 project, funded by the European Commission under the 7th Framework Programme through Capacities Research Infrastructure, INFRA-2010-1.2.3 Virtual Research Communities, Combination of Collaborative Project and Coordination and Support Actions (CP-CSA) under grant agreement no RI-261600. V.F. acknowledges scholarship by the Jacob Isler Foundation.
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Fidelsky, V., Furman, D., Khodorkovsky, Y. et al. Electronic structure of β-NiOOH with hydrogen vacancies and implications for energy conversion applications. MRS Communications 7, 206–213 (2017). https://doi.org/10.1557/mrc.2017.26
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DOI: https://doi.org/10.1557/mrc.2017.26