بررسی الکتروشیمیایی الکترودهای نیکل/اکسید روتنیوم و نیکل/اکسیدروتنیوم/پوششهای مخلوط اکسید فلزی در آزادسازی گاز هیدروژن در محیط قلیایی

نوع مقاله: مقاله علمی پژوهشی

نویسندگان

1 1 آزمایشگاه پزوهشی الکتروشیمی، گروه شیمی فیزیک، دانشکده شیمی، دانشگاه تبریز، تبریز، ایران 2 دانشکده فنی، دپارتمان علم مواد و نانوتکنولورژی ، دانشگاه قبرس شمالی ، نیکوزیا، قبرس شمالی ، مرسین 10، ترکیه

2 آزمایشگاه پزوهشی الکتروشیمی، گروه شیمی فیزیک، دانشکده شیمی، دانشگاه تبریز، تبریز، ایران

چکیده

الکترودهای Ni/RuO2 به روش ترسیب الکتروشیمیایی از یک حمام اسیدی RuCl3 در دمای اتاق و سپس آنیلینگ در دمای 120درجه ی سانتی گراد به مدت 150 دقیقه ساخته شدند. بررسی مورفولوژی سطح، ساختاری به صورت ترک خورده برای الکترود Ni/RuO2 نشان داد. همچنین مطالعات الکتروشیمیایی حاکی از برتری فعالیت الکتروکاتالیستی الکترود Ni/RuO2 در مقایسه با نیکل بدون پوشش بود. سپس پوشش هایRuO2-TiO2  با درصد مولی (80-20)، RuO2-TiO2-IrO2  با درصد مولی (20-60-20) وRuO2-TiO2-Ta2O5  با درصد مولی (20-60-20) بر روی بستر Ni/RuO2به روش سل ژل و تجزیه ی حرارتی در 450 درجه ی سانتی گراد ساخته شدند. تصاویر SEM بیشترین زبری سطح را برای الکترود RuO2-TiO2-IrO2 نشان دادند. آنالیز XRD نشانگر تشکیل محلول جامد در بین RuO2 با IrO2 و Ta2O5 بود. مطالعات الکتروشیمیایی شامل بررسی فعالیت و نیز بررسی میزان پایداری، بهترین عملکرد را برای الکترود RuO2-TiO2-IrO2 نشان داند.

کلیدواژه‌ها


عنوان مقاله [English]

Electrochemical Evaluation of Ni/RuO2 and Ni/RuO2/Mixed- Metal Oxide Coatings Electrodes toward Hydrogen Evolution Reaction in Alkaline Medium

نویسندگان [English]

  • Mirghasem Hosseini 1
  • Esmaeel Ariankhah 2
چکیده [English]

Ni/RuO2 electrode was fabricated by electrochemical deposition from an acidic RuCl3 solution at room temperature, then annealing at 120oC for 150 min. Morphology characterization revealed a mud-crack structure and electrochemical investigations of Ni/RuO2 and Ni bare substrate indicated more activity of Ni/RuO2 toward hydrogen evolution reaction. Afterward, RuO2-TiO2 (20-80), RuO2-TiO2-IrO2 (20-60-20) and RuO2-TiO2-Ta2O5 (20-60-20) mol. % were constructed by sol gel and thermal decomposition at 450oC on previously prepared Ni/RuO2 substrates. SEM micrographs showed the most roughness for RuO2-TiO2-IrO2 coating. XRD analysis revealed the formation of solid solution structures between RuO2 by IrO2 and Ta2O5. Electrochemical studies, including activity and stability studies also revealed the excellent performance for RuO2-TiO2-IrO2 due to its more surface roughness and also stabilizing effect of IrO2 and RuO2 on each other.

کلیدواژه‌ها [English]

  • Hydrogen evolution reaction
  • Mixed metal oxide coatings
  • Roughness
  • Accelerated life test
  • Electrochemical impedance
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