Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

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• 作者：Donghong Duan ; Quan Wang ; Huihong Liu ; Xiu You…
• 关键词：Direct borohydride fuel cell ; Core ; shell nanoparticles ; Borohydride electrooxidation ; Silver catalysts ; Kinetic parameters
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：20
• 期：10
• 页码：2699-2711
• 全文大小：2,617 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768
• 卷排序：20

文摘

Carbon-supported Ni@Ag core-shell nanoparticles were synthesized and used as the anode electrocatalyst for direct borohydride-hydrogen peroxide fuel cell (DBHFC). The morphology, structure, and composition of the as-prepared electrocatalysts are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). Electrochemical characterizations are performed by cyclic voltammetry (CV), chronoamperometry (CA), linear scan voltammetry with rotating disk electrode (LSV RDE), and fuel cell test. The catalytic behaviors and main kinetic parameters (e.g., Tafel slope, number of electrons exchanged, exchange current density, and apparent activation energy) toward BH₄‐ oxidation on Ag/C and Ni@Ag/C electrocatalysts are determined. Results show that the as-prepared nanoparticles have a core-shell structure with the average size approximately 13 nm. The kinetics of NaBH₄ oxidation is faster for Ni@Ag/C than that for Ag/C. Among the as-prepared catalysts, the highest transition electron value and the lowest apparent activation energy are obtained on Ni₁@Ag₁/C; the values are 4.8 and 20.23 kJ mol−1, respectively. The DBHFC using Ni₁@Ag₁/C as anode electrocatalyst and Pt mesh (1 cm2) as cathode electrode obtains the maximum anodic power density as high as 8.54 mW cm−2 at a discharge current density of 8.42 mA cm−2 at 25 °C.