Synthesis of Electrodeposition of Cobalt Based Film on a Nickel Foam Electrode for Supercapacitor Applications

Abstract

In this study, cobalt-based film was electrodeposited on nickel foam current collectors for supercapacitor applications. The cobalt-based film was grown directly from pyrophosphate electrolyte to nickel foam by applying a constant voltage of -1.5 V. Cyclic voltamogram and chroamperometric data of cobalt deposition were presented. The resulting cobalt based modified nickel foam electrode was then transferred into the KOH electrolyte. Electrochemical behavior of uncoated and coated nickel foam electrode was characterized in alkaline media. Electroactivity of bare nickel foam increased significantly when it was coated with cobalt film. Cobalt modified nickel foam electrode had high cycle stability in KOH. The morphology of uncoated and coated nickel foam electrode was characterized by SEM. The specific capacitance of the electrode at the scan rates of 5 and 100 mV s-1 was measured as 538 F g-1 and 261 F g-1, respectively. The rate-limiting step of the obtained cobalt based electrode had a surface controlled mechanism.

Keywords

• Supercapacitor
• Electrochemical storage
• cathodic potential

Süperkapasitör Uygulamaları için Elektrodepolanmış Kobalt Temelli Filmin Nikel Köpük Elektrot Üzerine Sentezi

Abstract

Bu çalışmada, kobalt temelli film, süperkapasitör uygulamaları için nikel köpük akım toplayıcıları üzerine elektrodepolanmıştır. Kobalt temelli film, -1,5 V'luk sabit bir voltaj uygulanarak doğrudan pirofosfat elektrolitinden nikel köpük üzerine büyütüldü. Kobalt birikiminin döngüsel voltamogram ve kronoamperometrik verileri sunuldu. Elde edilen kobalt temelli modifiye nikel köpük elektrot daha sonra KOH elektrolitine aktarıldı. Kaplanmamış ve kaplanmış nikel köpük elektrotun elektrokimyasal davranışı bazik ortamda karakterize edildi. Kaplanmamış nikel köpük elektrodun elektroaktivitesi, kobalt film ile kaplandığında önemli ölçüde artığı gözlendi. Kobaltla modifiye edilmiş nikel köpük elektrotu KOH elektrolitinde yüksek çevrim kararlılığına sahipti. Kaplanmamış ve kaplanmış nikel köpük elektrotun morfolojisi SEM ile karakterize edildi. Elektrotun 5 ve 100 mV s-1 tarama hızlarındaki spesifik kapasitansı, sırasıyla 538 F g-1 ve 261 F g-1 olarak ölçüldü. Elde edilen kobalt temelli elektrotun hız sınırlayıcı adımı, yüzey kontrollü bir mekanizmaya sahip olduğu gözlendi.

Keywords

• Süperkapasitör
• Elektrokimyasal depolama
• katodik potansiyel

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