بررسی رفتار الکتروکاتالیستی مورفولوژی های مختلف پوشش های نیکل در واکنش الکترواکسایش اوره
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینزهرا نیک سرشت 1 * , رسول امینی 2 , محسن سروری 3
1 - دانشجوی دانشگاه صنعتی شیراز
2 - دانشیار دانشکده مهندسی و علم مواد، دانشگاه صنعتی شیراز، شیراز، ایران.
3 - استادیار شیمی ، دانشکده شیمی، دانشگاه صنعتی شیراز، شیراز، ایران
کلید واژه: رسوب دهی الکتریکی, پیل سوختی اوره, الکترواکسایش اوره, الکتروکاتالیست نیکل,
چکیده مقاله :
مقدمه: رها شدن پساب های غنی از اوره یک تهدید جدی برای محیط زیست محسوب می شود. حذف اوره به روش الکترواکسایش، یک تکنیک موثر است که علاوه بر تصفیه آب، همراه با تولید انرژی الکتریسیته است. مهم ترین اقدام بهبود سینتیکی این تکنیک، انتخاب مواد و طراحی الکتروکاتالیست ها می باشد. در این پژوهش، اثر الکتروکاتالیستی انواع مورفولوژی های نیکل بر الکترواکسایش اوره بررسی شد.
روش: ابتدا تحت تاثیر مقادیر مختلف افزودنی در الکترولیت پوشش دهی، به روش رسوب دهی الکتریکی، طی دو مرحله پوشش های نیکل ساخته شدند. سپس بررسی های ریزساختاری، زبری سطح و رفتار الکتروکاتالیستی به ترتیب توسط میکروسکوپ الکترونی روبشی، زبری سنج و آزمون های الکتروشیمیایی در محیط قلیایی در حضور اوره بررسی شد.
یافتهها: مشاهدات میکروسکوپی، انوع مورفولوژی از ورق های عمود بر سطح تا ساختار توده ای و در نهایت ساختار شاخه ای شکل را آشکار کرد. زبری سنجی، افزایش تدریجی زبری را در حضور افزودنی تایید کرد. از طرفی، اثر مورفولوژی پوشش های نیکل بر رفتار الکتروکاتالیستی مشخص کرد که بیشترین میزان رفتار کاتالیستی، حاصل از ساختار سه بعدی شاخه ای شکل (افزودنی 240 گرم در لیتر) با جریان خروجی 59.19 میلی آمپر بر سانتیمتر مربع بود که در ادامه، توانایی کاتالیزگری در حضور غلظت های زیاد اوره تا 2 مولار تایید شد. کاتالیست بهینه، پایداری قابل توجهی در طولانی مدت از خود نشان داد.
نتیجهگیری: اثرغلظت ماده افزودنی بر مورفولوژی وموفولوژی بر رفتار الکتروکاتالیستی مشخص شد. بهترین رفتار الکتروکاتالیستی در حضور 240 گرم افزودنی در الکترولیت رسوب دهی الکتریکی حاصل شد.
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Abstract Introduction: Releasing untreated urea-rich wastewater causes a severe threat to environmental protection and human health. In this regard, the electrooxidation technique offers an effective method for wastewater purification and electrical energy generation. Material selection and design for electrocatalysts are the most important approaches toward boosting the kinetics of this reaction. In this article, the effect of various nickel morphologies on the urea electrooxidation reaction was investigated.Methods: Different nickel coatings were deposited using the electrodeposition method in the presence of different additive concentrations. The microstructural studies, surface roughness measurement, and electrocatalytic behavior investigations were done by SEM, roughness instrument, and electrochemical tests in the alkaline media in the presence of 0.33 M urea, respectively. Findings: The SEM images revealed the different morphologies from vertical plate-like morphology to rough colony features and finally to branched-like structure. Increasing additive concentration led to a higher surface roughness value. Moreover, the effect of morphology on electrocatalytic behavior verified that three-dimensional branched-like morphology (due to adding 240 g/L of additive) showed the highest current density of 59.19 mA/cm2. The branched-like morphology of the coating showed a good electrocatalytic ability at higher concentrations of urea up to 2 M. Moreover, this coating exhibited significant electrostatic stability through long-term monitoring. Conclusion: The results verified that the morphological changes and electrocatalytic behavior were affected by the additive concentration. The best result of electrocatalytic kinetics was related to the existence of 240 g/L additive in the electrodeposition electrolyte. |
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