ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions
Abstract
Spark plasma sintered transition metal diborides such as HfB2, ZrB2 and their solid solutions were investigated as electrode materials for electrochemical hydrogen evolutions reactions (HER) in 1 M H2SO4 and 1 M NaOH electrolytes. HfB2 and ZrB2 formed complete solid solutions when mixed in 1:1, 1:4, and 4:1 ratios and they were stable in both electrolytes. The HER kinetics of the diborides were slower in the basic solution than in the acidic solutions. The Tafel slopes in 1 M H2SO4 were in the range of 0.15 - 0.18 V/decade except for pure HfB2 which showed a Tafel slope of 0.38 V/decade. In 1 M NaOH the Tafel slopes were in the range of 0.12 - 0.27 V/decade. The composition of HfxZr1-xB2 solid solutions with x = 0.2 - 0.8, influenced the exchange current densities, overpotentials and Tafel slopes of the HER. As a result, the EIS data were fitted with a porous film equivalent circuit model in order to better understand the HER behavior. In addition, modeling calculations, using density functional theory approach, were carried out to estimate the density of states and band structure of the boride solid solutions.
- Authors:
-
- Univ. of Idaho, Moscow, ID (United States)
- Publication Date:
- Research Org.:
- Univ. of Idaho, Moscow, ID (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1331595
- Alternate Identifier(s):
- OSTI ID: 1411449
- Grant/Contract Number:
- FE0022988
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Letters
- Additional Journal Information:
- Journal Name: Materials Letters; Journal ID: ISSN 0167-577X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 25 ENERGY STORAGE; electroceramics; energy storage and conversion; solar energy materials; borides; ceramic composites
Citation Formats
Sitler, Steven J., Raja, Krishnan S., and Charit, Indrajit. ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions. United States: N. p., 2016.
Web. doi:10.1016/j.matlet.2016.10.122.
Sitler, Steven J., Raja, Krishnan S., & Charit, Indrajit. ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions. United States. https://doi.org/10.1016/j.matlet.2016.10.122
Sitler, Steven J., Raja, Krishnan S., and Charit, Indrajit. Wed .
"ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions". United States. https://doi.org/10.1016/j.matlet.2016.10.122. https://www.osti.gov/servlets/purl/1331595.
@article{osti_1331595,
title = {ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions},
author = {Sitler, Steven J. and Raja, Krishnan S. and Charit, Indrajit},
abstractNote = {Spark plasma sintered transition metal diborides such as HfB2, ZrB2 and their solid solutions were investigated as electrode materials for electrochemical hydrogen evolutions reactions (HER) in 1 M H2SO4 and 1 M NaOH electrolytes. HfB2 and ZrB2 formed complete solid solutions when mixed in 1:1, 1:4, and 4:1 ratios and they were stable in both electrolytes. The HER kinetics of the diborides were slower in the basic solution than in the acidic solutions. The Tafel slopes in 1 M H2SO4 were in the range of 0.15 - 0.18 V/decade except for pure HfB2 which showed a Tafel slope of 0.38 V/decade. In 1 M NaOH the Tafel slopes were in the range of 0.12 - 0.27 V/decade. The composition of HfxZr1-xB2 solid solutions with x = 0.2 - 0.8, influenced the exchange current densities, overpotentials and Tafel slopes of the HER. As a result, the EIS data were fitted with a porous film equivalent circuit model in order to better understand the HER behavior. In addition, modeling calculations, using density functional theory approach, were carried out to estimate the density of states and band structure of the boride solid solutions.},
doi = {10.1016/j.matlet.2016.10.122},
journal = {Materials Letters},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 09 00:00:00 EST 2016},
month = {Wed Nov 09 00:00:00 EST 2016}
}
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Works referencing / citing this record:
Molten salt synthesis, characterization, and formation mechanism of superfine (Hf x Zr 1‐ x )B 2 solid‐solution powders
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