کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6472798 1424140 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical hydrogen storage performance of hierarchical Co metal flower-like microspheres
ترجمه فارسی عنوان
عملکرد الکتروشیمیایی ذخیره هیدروژن از سلول های سلولی مانند میکروسپرس های فلزی مانند گل
کلمات کلیدی
فلز کبالت، سلسله مراتبی گل مانند معماری، ذخیره سازی هیدروژن الکتروشیمیایی، ظرفیت تخلیه،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

Hierarchical cobalt metal flower-like microsphere (Co-FM) was synthesized by a facile hydrothermal process, and its electrochemical hydrogen storage performance was investigated. The Co-FM was generated by the reduction of beta cobalt hydroxide [β-Co(OH)2] platelets in the presence of a mild reducing agent without the use of any template or surfactant. The obtained sample was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and energy dispersive spectrometry (EDS). The XRD analysis reveals that this sample has a pure hexagonal close-packed (hcp) structure. The FE-SEM and HR-TEM observations indicate that the synthesized particles are flower-like microspheres with an average diameter of ∼1.5 μm, composed of individual Co metal platelets. The electrochemical hydrogen storage performance was investigated as the negative electrode for nickel-metal hydride (Ni-MH) battery in aqueous KOH solution. The electrochemical measurements demonstrated that this material showed better reversibility, higher hydrogen storage capacity, and higher rate dischargeability than the commercial Co metal powder with similar particle size (∼2 μm) under atmospheric temperature and pressure. Its maximum discharge capacity was ∼360 mA h g−1 and remained 300 mA h g−1 even after 100 cycles, and the capacity retention rate was ∼83%. This significant electrochemical hydrogen storage performance can be attributed to its hierarchical architecture, which leads to increasing the surface area, reducing the diffusion pathway, and buffering the volume change during cycling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 217, 1 November 2016, Pages 132-138
نویسندگان
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