کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5463540 | 1517200 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions ZrB2-HfB2 solid solutions as electrode materials for hydrogen reaction in acidic and basic solutions](/preview/png/5463540.png)
چکیده انگلیسی
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 1Â M H2SO4 and 1Â 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 1Â M H2SO4 were in the range of 0.15-0.18Â V/decade except for pure HfB2 which showed a Tafel slope of 0.38Â V/decade. In 1Â M NaOH the Tafel slopes were in the range of 0.12-0.27Â V/decade. The composition of HfxZr1âxB2 solid solutions with x=0.2-0.8, influenced the exchange current densities, overpotentials and Tafel slopes of the HER. 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 188, 1 February 2017, Pages 239-243
Journal: Materials Letters - Volume 188, 1 February 2017, Pages 239-243
نویسندگان
Steven J. Sitler, Krishnan S. Raja, Indrajit Charit,