کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
186076 459607 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An electrochemical study of carbon dioxide electroreduction on gold-based nanoparticle catalysts
ترجمه فارسی عنوان
مطالعه الکتروشیمیایی الکترودهیج دی اکسید کربن بر روی کاتالیزورهای نانوذرات مبتنی بر طلا
کلمات کلیدی
کاهش دی اکسید کربن، نانوذرات نقره طلا، الکترود روی دیسک چرخان، طیف سنجی امپدانس الکتروشیمیایی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Gold–silver nanoparticles were used as catalysts for carbon dioxide reduction (CO2ER).
• Gold–silver nanoparticles present higher selectivity for CO2ER than Au nanoparticles.
• Electrochemical impedance spectroscopy (EIS) was used to study CO2ER.
• The two charge transfers observed during EIS are associated with an adsorbed intermediate.
• Rotating ring-disk electrode runs revealed the potential of CO2ER for each catalyst.

We report here on an electrochemical study of carbon dioxide electroreduction (CO2ER) employing electrochemical impedance spectroscopy (EIS) and a rotating ring-disk electrode (RRDE) on different gold based catalysts, namely bulk polycrystalline gold, gold nanoparticles (Au NPs) and Au@Ag core–shell nanoparticles. RRDE measurements allowed the identification of the reduction potential of CO2 to CO and the characterisation of NPs based on their selectivity for CO2ER with respect to hydrogen evolution. Gold–silver combined catalysts were found to be more selective than Au NPs although at higher overpotential. One gold–silver catalyst exhibits a constant selectivity over a wide potential range. For the first time, EIS data showed the existence of two charge transfers during the reduction of CO2. These are attributed to two surface confined reactions that involve an adsorbed intermediate which is correlated with a proposed mechanism. The potential range of these reactions is specific for each catalyst with gold–silver catalysts exhibiting a slower electron transfer than Au NPs, Au and Ag polycrystalline electrodes.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 128, 10 May 2014, Pages 75–84
نویسندگان
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