Abdulcabbar YAVUZ, Naime ÖZDEMİR, Perihan YILMAZ ERDOĞAN, Huseyin ZENGİN

Süperkapasitör Uygulamaları için Paslanmaz Çelik Örgü Üzerine Nikel Kaplama Üretimi

Süperkapasitör uygulamaları için tek adımda paslanmaz çelik örgü akım toplayıcısı elektrokimyasal yöntemle kaplandı. Paslanmaz çelik ağı yüksek yüzey alanına sahip olduğundan, iyonların erişilebilirliği dökme paslanmaz çelikten daha kolaydır. İnce nikel filmler, sulu çözelti elektrolit ortamında, oda sıcaklığı koşulları altında, 150, 300 ve 600 saniye boyunca -1.5 V potansiyelinin uygulanmasıyla üç elektrotlu bir elektrokimyasal konfigürasyon sistemi ile sentezlendi. Hazırlanan nikel filmlerin elektrokimyasal kapasitif özellikleri 1 M KOH elektrolit çözeltisinde incelendi. Paslanmaz çelik örgü yüzeyinde elde edilen nikel kaplamaların mikro yapıları ağaç kabuklarına benzemektedir. Bu yüzden, yüksek yüzey alanına sahip elektrotlar, pirofosfat ortamından nikelin elektrodepolanması ile elde edildi. Nikel kaplı paslanmaz çelik örgü ve bazik elektrolit arasındaki iyon ve elektron transfer hızları arttırıldı. +0.2 V ve +0.6 V arasındaki pozitif potansiyelde redoks reaksiyonuna sahip nikel kaplı çelik örgü, katot elektrot olarak kullanılabilir. Nikel/paslanmaz çelik örgü elektrot, 5 mV s-1 tarama hızında 1090 F g-1 spesifik kapasitansa sahiptir. Paslanmaz çeliğin KOH elektrolitinde elektroaktivitesi nikel filmle karıştırıldığında, sulu çözelti içindeki paslanmaz çelik ağ yüzeyindeki nikel temelli kaplamalar, süperkapasitör uygulamalarında katot elektrodu olarak kullanılabilir.

Fabrication of Nickel Coating on a Stainless Steel Mesh for Supercapacitor Applications

A stainless steel mesh current collector was coated by one-step electrochemical method forsupercapacitor applications. As stainless steel mesh has a high surface area, accessibility ofions may be achieved easier than bulk stainless steel. Thin nickel films were synthesized in anaqueous solution electrolyte medium by a three-electrodes electrochemical configurationsystem under room temperature conditions by applying the potential of -1.5 V for 150, 300and 600 seconds. The electrochemical capacitive characterization of the prepared nickel filmswas investigated in 1 M KOH electrolyte solution. The surface morphology of the preparedelectrodes was examined. Microstructures of nickel coatings obtained on stainless steel wiresurface were similar to tree peels. Therefore, electrodes with high surface area were obtainedin the electrodeposition of nickel from pyrophosphate medium. The ion and electron transferrates between the nickel-coated stainless steel mesh and the alkaline electrolyte wereincreased. Nickel coated steel mesh having a redox reaction at positive potential between +0.2V and +0.6 V could be used as cathode electrodes. The nickel/stainless steel mesh electrodehas a specific capacity of 1090 F g-1at the scan rate of 5 mV s-1. As the electroactivity ofstainless steel in KOH electrolyte was increased with nickel film, nickel-based coatings onstainless steel mesh surface in aqueous solution can be used as cathode electrodes insupercapacitor applications.

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