Enhanced performance of supercapacitors based on rotationally stacked CVD graphene

• Published in: Journal of applied physics 2022-04, Vol.131 (16)
• Main Authors: Ibrahim, W. Lisheshar, Şar, Hüseyin, Ay, Feridun, Kosku Perkgöz, Nihan
• Format: Article
• Language: English
• Subjects: Applied physics; Bilayers; Capacitance; Chemical vapor deposition; Decoupling; Flux density; Graphene; Monolayers; Multilayers; Performance enhancement; Raman spectra; Rotational spectra; Supercapacitors; Two dimensional materials
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/5.0084969

One of the main problems faced by 2D materials used in supercapacitor applications when scaling up is restacking, such that their gravimetric capacitances become dramatically inferior to that of their monolayer forms. This study analyzes the Raman spectra of transferred layers of CVD-graphene revealing decoupling and rotational stacking of layers, with the potential of retention of intrinsic monolayer properties. Rotationally stacked layers have the potential to mitigate restacking and, thus, are capable of easing ion intercalation and boosting their performance in supercapacitor applications. In this pursuit, binder-free supercapacitors are fabricated out of chemical vapor deposited bilayer graphene, successively transferred to form rotationally stacked multilayers. Supercapacitors constructed with rotationally stacked four-layer graphene have an incredible specific gravimetric capacitance of 316.1 F g−1 at 1 mV s−1, with a corresponding energy density of 28.1 Wh kg−1 and ∼100% capacitance retention at 10 000 cycles.