Supercapacitor application of boron nitride quantum dot-graphene hydrogel composite

Abstract

In this study, the synthesis and electrochemical application of boron nitride quantum dot (BNKN) / reduced graphene oxide (rGO) hybrid structure, which is a new electrode material to be used for supercapacitors, is investigated. BNKN is recommended because it has the same crystal structure as graphene oxide (GO), and so the hybrid structure of BNKN@rGO exhibits excellent electrical characteristics. BNKN, a hexagonal boron nitride (h-BN) nanostructure-based hybrid material, has appeared in recent studies due to its thermal stability and electrical conductivity, while graphene is frequently preferred in supercapacitor studies because it has a large specific surface area. In addition, the main reason for adding different heterostructures to this structure to improve the capacitance value of graphene is; changing the electron donating properties of carbon materials has been made a priority. Therefore, the specific capacitance value was measured, considering that the BNKN@rGO hybrid electrode to be used in supercapacitors would increase the electrochemical activity. A high capacitance value of 207.5 F/g was found at 5 mvs-1 scanning speed of the BNKN@rGOH hybrid structure as a result of electrochemical investigations. At 10,000 cycles, it also demonstrated a cyclic stability performance of 88.9%.

Keywords

• Supercapacitor
• Boron nitride quantum dots
• Hybrid structure
• Graphene hydrogel

Bor nitrür kuantum nokta-grafen hidrojel kompozitinin süper kapasitör uygulaması

Öz

Bu çalışmada süperkapasitörler için kullanılacak yeni bir elektrot malzemesi olan bor nitrür kuantum nokta (BNKN) / indirgenmiş grafen oksit (rGO) hibrit yapısının sentezini ve elektrokimyasal uygulamalarına yer verilmiştir. BNKN’nin, grafen oksit (GO) ile aynı kristal yapıya sahip olması ve bunun sonucunda BNKN@rGO hibrit yapısının çok iyi elektriksel özellik gösteriyor olması tercih edilme sebeplerindendir. Hekzagonal bor nitrür (h-BN) nanoyapı tabanlı hibrit malzeme olan BNKN, termal kararlılıkları ve elektriksel iletkenlikleri sebepleriyle son yıllardaki çalışmalarda karşımıza çıkarken, grafen ise geniş spesifik yüzey alanına sahip olduğu için süperkapasitör çalışmalarında sıklıkla tercih edilmektedir. Ayrıca, grafenin kapasitans değerini geliştirmek için bu yapıya farklı nanomalzemeler eklenmesinin ana sebebi karbon malzemelerin elektron verici özelliklerinin geliştirilmesidir. Bundan dolayı, süperkapasitörlerde kullanılacak BNKN@rGO hibrit elektrotunun elektrokimyasal aktiviteyi arttıracağı düşünülerek spesifik kapasitans değeri ölçülmüştür. Elektrokimyasal çalışmalar sonucunda, BNKN@rGOH hibrit yapısının 5 mvs-1 tarama hızında 207.5 F/g yüksek kapasitans değeri elde edilmiştir. Ayrıca 1.000 döngüde %88.9’luk döngüsel stabilite performansı sergilemiştir.

Anahtar Kelimeler

• Süperkapasitör
• Bor nitrür kuantum nokta
• Hibrit yapı
• Grafen hidrojel

Kaynakça

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