دانلود رایگان ترجمه مقاله آماده سازی ذرات کاتالیستی PtAu بر روی الکترودهای مثبت باتری – Electrochemsci 2012
دانلود رایگان مقاله انگلیسی تهیه ذرات کاتالیستی PtAu بر روی الکترود مثبت باتری لیتیم/ هوا با استفاده از آبکاری پالسی به همراه ترجمه فارسی
عنوان فارسی مقاله: | تهیه ذرات کاتالیستی PtAu بر روی الکترود مثبت باتری لیتیم/ هوا با استفاده از آبکاری پالسی |
عنوان انگلیسی مقاله: | Preparation of PtAu Catalytic Particles on Positive Electrode of Li/air Battery Using Pulse Electroplating |
رشته های مرتبط: | شیمی، شیمی فیزیک، شیمی کاتالیست، شیمی تجزیه و شیمی کاربردی |
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نشریه | Electrochemsci |
کد محصول | f434 |
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بخشی از ترجمه فارسی مقاله: 2. تجربی 2..2مونتاژ سلول لیتیم/هوا 2..3 اندازه گیری |
بخشی از مقاله انگلیسی: 2. EXPERIMENTAL 2.1 Pulse electroplating of PtAu particles 0.75g of polyvinylidene fluoride (PVDF, AR) is dissolved in 3.0g of N-methyl pyrrolydone (NMP, AR). 0.25g of acetylene black was added to the PVDF/NMP mixture and blended by a magnetic rotor for 12h. Porous air electrodes were used as cathodes that were prepared by loading the Carbon/PVDF/NMP slurry on nickel foam (thickness of 1.8 mm, Changsha Liyuan new meterials Co. Ltd.) sheets and then drying for 12h. A gold plate was used as anode. Baths of 50 ℃ contained HAuCl4 of 6.7~13.3 mmol/L, H2Pt Cl6 of 6.7 ~13.3 mmol/L and H2SO4 of 0.5mol/L. Pulse electroplating were carried 60s for one piece of cathode by a pulse power (DMC-30M, Shenzhen Yuanshunda Electronic Machinery Co., Ltd.) with parameters adjusting as peak current density of 100~250mA/cm2 , pulse width of 5%~30% and frequency of 0.1~1kHz. 2.2 Assembly of Li/air cell CR2025 coin cells with 1mm diameter holes on top-cover were used to assemble nonaqueous Li/air cell in a glove box full of argon. Positive electrodes were porous air electrodes with or without PtAu catalysts. Negative electrodes were lithium disk slices of 14mm diameter. Polypropylene membranes (thickness of 20μm, Celgard) were dipped in an ionic liquid electrolyte prepared by adding Li-TFSI into EMI-TFSI liquids and agitating for 6~8h, and then assembled in the cells, where TFSI means Tri Fluoro methyl Sulfonyl Imide, EMI means 1-Ethyl-3-MethylImidazolium. 2.3 Measurements Stability of PtAu catalyst were characterized by cyclic voltammetric (CV) measurements using an electrochemical analyzer (CHI630B, CH Instruments) at scan rate of 10mV/s in 1mol/L KOH aqueous solutions that were aerated with oxygen of 20 min[13]. PtAu alloy coatings were pulse electrodeposited on Glassy Carbon (GC) electrodes (geometric area: 0.2 cm2 ) polished by 1.5μm α- Al2O3, which were used as working electrodes. Hg/HgO electrode and Platinum plate of 1cm2 were reference electrode and counter electrode, respectively. Morphologies and compositions of PtAu catalyst were measured by scan electron microscopy (SEM) and energy-dispersive X-ray (EDX), respectively. Charge and discharge behaviors of Li/air cells were tested in air atmosphere using battery test system (Neware CT-3008W) at constant current (CC) steps of 0.05 mA/cm2 in voltage range of 1.8V~4.0V vs. Li/Li+ at ambient temperature (25±2 ◦C). |