$MnO_2$ /Aktif Karbon Elektrotlar ile Üretilen Süperkapasitörlerin Elektrokimyasal Performans

Fıstık kabuklarından piroliz ve kimyasal aktivasyon teknikleri kullanılarak yüksek yüzey alanına sahip aktif karbon üretilerek, bu aktif karbonun yüzeyinde $MnO_2$sentezlendi. Aktif karbonlar elektrot olarak kullanılarak süperkapasitörler fabrike edildi ve sabit akım şarj-deşarj, kendiliğinden boşalma ve çevrim ömrü testleri gerçekleştirildi. $MnO_2$yüklemesi yüzey alanında azalmaya yol açmıştır. Gözenek hacim dağılımı hesaplamaları sentezlenen $MnO_2$parçacıklarının nanometre boyutunda olduğunu göstermiştir. $MnO_4$ -iyonlarının aktif karbon yüzeyinde $MnO_2$ ’ye yükseltgenmesi nedeni ile yüzeyde oksijen içeren fonksiyonlu grupların sayısında değişim olmuştur. $MnO_2$yüklemesi yüzey alanı düşüşüne sebep olmasına rağmen, spesifik kapasitansın 49 F/g’dan 68 F/g’a çıkmasına yol açmıştır.

Electrochemical Performance of Fabricated Supercapacitors Using $MnO_2$ /Activated Carbon Electrodes

Peanut shells were subjected to pyrolysis and chemical activation to produce activated carbon with high specific surfacearea. $MnO_2$ particles were synthesized on the activated carbon surface. Supercapacitors were fabricated by usingactivated carbon electrodes and tested by constant current charge-discharge, self-discharge, and life-cycle tests. $MnO_2$loading led to a significant decrease in specific surface area. The pore volume distribution calculations revealed that the$MnO_2$ particles were in nanometer size. Because of the reduction of $MnO_4$- Ions to $MnO_2$ over the activated carbon surface,the amount of oxygen-containing surface functional groups, changed. Although the $MnO_2$ loading caused a decrease insurface area, the specific capacitance increased from 49 F/g to 68 F/g.

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