ساخت و ارزیابی الکترود هیدروژن بر پایه نانو ذرات نیکل بر بستر گرافن در الکترولیز آب

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیمی فیزیک، دانسکده شیمی، دانشگاه صنعتی اصفهان، اصفهان، ایران

2 گروه شیمی، دانشکده شیمی، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

الکترولیز آب یکی از بهترین روش­ها برای تولید هیدروژن با خلوص بالاست. یافتن کاتالیست­ های ارزان با پایداری زیاد و فعالیت خوب به­ جای فلزات نجیب، به­ عنوان الکترود هیدروژن، موضوع بسیاری از تحقیقات دنیاست. لذا، در این پژوهش، با هدف ساخت یک الکترود کارا برای تولید هیدروژن، نانو­ذرات نیکل بر روی بستر گرافن رشد داده شده و روی فوم نیکل لایه­نشانی شده­اند. ساختار این نانو­ذرات به­ وسیله­ تکنیک­ های مختلفی ازجمله FT-IR، XRD و SEM مورد بررسی قرار گرفت. برای ارزیابی رفتار الکتروشیمیایی نانو­ذرات ساخته ­شده از تکنیک ­های الکتروشیمیایی ولتامتری چرخه­ ای و ولتامتری روبش خطی بهره برده شده است. نتایج نشان می­دهد که فعالیت الکتروکاتالیستی نیکل با گذشت زمان بهبود می­ یابد، به­ گونه­ ای که پس از 500 پیمایش محدوده­ پتانسیل، Ni/rGO دارای بیش پتانسیل mV 281- در چگالی جریان mAcm-2 10 و شیب تافلی mVdec-1 126- است که این پارامترها پس از 5 پیمایش، به ­ترتیب، mV 303- و mV dec-1 149- هستند. برای مطالعه عملکرد این نانو­ذرات در فرایند تولید هیدروژن در شرایط واقعی، یک سل الکترولیزی غشایی مورد استفاده قرار گرفت. نتایج این ارزیابی نشان می­دهد که Ni/rGO در چگالی جریانmAcm-2  200 دارای پتانسیل 9/1 ولت است که در مقایسه با فوم نیکل دارای عملکرد بهتری است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Preparation and evaluation of hydrogen electrode based on nickel nanoparticles on the graphene in water electrolysis

نویسندگان [English]

  • Mohammad Zhiani 1
  • Javad Rezaei 2
  • Saeedeh Kamali 2
1 Department of chemistry, faculty of chemistry, Isfahan university of technology, Isfahan, Iran
2 Department of chemistry, Faculty of chemistry, Isfahan university of technology, Isfahan, Iran
چکیده [English]

  water electrolysis is one of the best methods for high purity Hydrogen (and Oxygen) production. Using nonprecious and durable electrocatalysts with low overpotential and high activity instead of noble metals as cathode is one of the most investigated subjects. In this project, Nickel nanoparticles have been grown on the reduced graphene oxide support and deposited on Nickel foam substrate to employ as HER catalyst. The structures of this catalyst were investigated by various techniques such as FT-IR, XRD, and SEM. These techniques showed that applied method for synthesis of a porous and homogeneous elctrocatalayst was successful. To evaluate the electrochemical behavior of this nanocatalyst, cyclic voltammetry and linear sweep voltammetry were applied. The electrocatalytic activity of Ni/rGO was improved after 500 CV cycles. The observed overpotential of Ni/rGO would be -281 mV at the current density of 10 mA cm-2 and Tafel slope of -126 mV dec-1. Whereas, these parameters for Ni/rGo after 5 CV cycles are -303 mV and -149 mV dec-1, respectively. Finally to study the performance of these nanoparticles in a real condition, an alkaline electrolysis cell was used. Ni/rGO exhibited the cell voltage of 1.9 V at the current density of 200 mA cm-2.

کلیدواژه‌ها [English]

  • water electrolysis
  • Hydrogen production
  • Ni nanoparticles
  • Graphene substrate
  • Alkaline medium
  • HER

مراجع

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سوخت و احتراق
دوره 11، شماره 3
پاییز 1397
صفحه 19-28

فایل ها

سابقه مقاله

  • تاریخ دریافت: 21 فروردین 1397
  • تاریخ بازنگری: 15 خرداد 1397
  • تاریخ پذیرش: 04 تیر 1397

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